BQ51050BYFPR

Order Now Product Folder Support & Community Tools & Software Technical Documents bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 bq5105xB High-Efficiency Qi v1.2-Compliant Wireless Power Receiver and Battery Charger 1 Features 3 Description • The bq5105x device is a high-efficiency, Qi-compliant wireless power receiver with an integrated Li-Ion/LiPol battery charge controller for portable applications. The bq5105xB devices provide efficient AC-DC power conversion, integrates the digital controller required to comply with Qi v1.2 communication protocol, and provides all necessary control algorithms needed for efficient and safe Li-Ion and LiPol battery charging. Together with the bq500212A transmitter-side controller, the bq5105x enables a complete wireless power transfer system for direct battery charger solutions. By using near-field inductive power transfer, the receiver coil embedded in the portable device can pick up the power transmitted by transmitter coil. The AC signal from the receiver coil is then rectified and conditioned to apply power directly to the battery. Global feedback is established from the receiver to the transmitter to stabilize the power transfer process. This feedback is established by using the Qi v1.2 communication protocol. 1 • • • • Single-Stage Wireless Power Receiver and Li-Ion/Li-Pol Battery Charger – Combines Wireless Power Receiver, Rectifier, and Battery Charger in a Single, Small Package – 4.20-V, 4.35-V, and 4.40-V Output Voltage Options – Supports a Charging Current up to 1.5 A – 93% Peak AC-DC Charging Efficiency Robust Architecture – 20-V Maximum Input Voltage Tolerance, With Input Overvoltage Protection – Thermal Shutdown and Overcurrent Protection – Temperature Monitoring and Fault Detection Compatible With WPC v1.2 Qi Industry Standard Power Stage Output Tracks Rectifier and Battery Voltage to Ensure Maximum Efficiency Across the Full Charge Cycle Available in Small DSGBA and VQFN Packages The bq5105xB devices integrate a low-impedance synchronous rectifier, low-dropout regulator (LDO), digital control, charger controller, and accurate voltage and current loops in a single package. The entire power stage (rectifier and LDO) use lowresistance N-MOSFETs (100-mΩ typical Rdson) to ensure high efficiency and low power dissipation. 2 Applications • • • • • Battery Packs Cell Phones and Smart Phones Headsets Portable Media Players Other Handheld Devices Device Information(1) PART NUMBER bq51050B bq51051B bq51052B PACKAGE BODY SIZE (NOM) VQFN (20) 4.50 mm × 3.50 mm DSBGA (28) 3.00 mm × 1.90 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Application Schematic bq5105xB AD-EN AD BAT CCOMM1 C4 COMM1 CBOOT1 D1 BOOT1 RECT C1 AC1 TI Wireless Power Transmitter R4 C3 TX COIL RX COIL C2 PACK+ NTC TS/CTRL AC2 BOOT2 CBOOT2 ROS COMM2 CCLAMP2 CCLAMP1 CLAMP2 TERM CLAMP1 EN2 ILIM R1 PACK- CHG CCOMM2 FOD PGND Tri-State Bi-State R5 HOST RFOD Copyright © 2016, Texas Instruments Incorporated 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com Table of Contents 1 2 3 4 5 6 7 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Device Options....................................................... Pin Configuration and Functions ......................... Specifications......................................................... 7.1 7.2 7.3 7.4 7.5 7.6 8 1 1 1 2 4 4 6 Absolute Maximum Ratings ...................................... 6 ESD Ratings.............................................................. 6 Recommended Operating Conditions....................... 6 Thermal Information .................................................. 6 Electrical Characteristics........................................... 7 Typical Characteristics ............................................ 10 Detailed Description ............................................ 13 8.1 Overview ................................................................. 13 8.2 Functional Block Diagram ....................................... 14 8.3 Feature Description................................................. 14 8.4 Device Functional Modes........................................ 27 9 Application and Implementation ........................ 28 9.1 Application Information............................................ 28 9.2 Typical Application .................................................. 28 10 Power Supply Recommendations ..................... 33 11 Layout................................................................... 33 11.1 Layout Guidelines ................................................. 33 11.2 Layout Example .................................................... 33 12 Device and Documentation Support ................. 34 12.1 12.2 12.3 12.4 12.5 12.6 12.7 Documentation Support ........................................ Related Links ........................................................ Receiving Notification of Documentation Updates Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 34 34 34 34 34 34 34 13 Mechanical, Packaging, and Orderable Information ........................................................... 34 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision E (March 2015) to Revision F Page • Changed all Qi v1.1 and WPC v1.1 To: Qi v1.2 and WPC v1.2 throughout the document ................................................... 1 • Added the Adaptive Communication Limit section ............................................................................................................... 24 • Deleted R1 = 29.402 kΩ R3 = 14.302 kΩ and added a link to SLUS629 in the Internal Temperature Sense (TS Function of the TS/CTRL Pin) section ................................................................................................................................. 25 Changes from Revision D (January 2014) to Revision E Page • Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .................................................................................................. 1 • Added the bq51052B 4.40-V option ....................................................................................................................................... 1 • Updated pinout images........................................................................................................................................................... 4 • Added thermal pad description in Pin Functions table ........................................................................................................... 4 • Added AD voltage to Recommended Operating Conditions .................................................................................................. 6 • Changed RECT overvoltage specification name from VRECT to VOVP ..................................................................................... 7 • Changed to ILIM_SHORT, OK from ILIM_SC for clarity...................................................................................................................... 7 • Added VOREG for bq51052B .................................................................................................................................................... 8 • Added minimum current for KILIM ............................................................................................................................................ 8 • Changed KILIM TYP value from 300 to 314 (min / max also changed) ................................................................................... 8 • Added IBULK spec for charging minimum and maximum......................................................................................................... 8 • Added VRECH for bq51052B .................................................................................................................................................... 8 • Added new spec ITermination ...................................................................................................................................................... 8 • Changed to VTSB from VTS for clarity................................................................................................................................... 8 • Changed from ITS-Bias for clarity ............................................................................................................................................... 8 • Deleted V0C-F as redundant..................................................................................................................................................... 8 • Changed typical JEITA regulation on bq51050B from 4.10 V to 4.06 V ................................................................................ 8 2 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 • Changed to clarify CTRL pin high and low levels................................................................................................................... 8 • Changed Thermal shutdown name to TJ-SD for clarity ............................................................................................................ 9 • Added section to describe Adapter Enable function............................................................................................................... 9 • Changed Synchronous rectifer switchover name to IBAT-SR for clarity..................................................................................... 9 • Added synchronous mode entry for bq51052B ...................................................................................................................... 9 • Deleted note regarding internal junction monitor reducing current - it is not applicable. ..................................................... 19 • Added section on modified JEITA profile for bq51052B....................................................................................................... 21 • Changed TS/CTRL function to correct Termination Packet value........................................................................................ 22 • Added Taper mode completion for Termination Packet ....................................................................................................... 22 • Changed Beta value from 4500 to 3380 to match NTC datasheet ...................................................................................... 25 • Changed received power maximum error from 250 mW to 375 mW to comply with latest WPC v1.2 specification ........... 27 Changes from Revision C (February 2013) to Revision D Page • Changed the ABSOLUTE MAXIMUM RATINGS - moved AC1 and AC2 onto a single row with a Min value of –0.8 ......... 6 • Added section: Details of a Qi Wireless Power System and bq5105xB Power Transfer Flow Diagrams............................ 15 • Changed text in the Battery Charge Profile section ............................................................................................................. 19 • Changed Battery failure Conditions in Table 1..................................................................................................................... 22 • Changed Equation 3 and Equation 4 ................................................................................................................................... 25 • Changed R2 = 7.81 kΩ To: R1 = 29.402 kΩ ......................................................................................................................... 25 • Changed R3 = 13.98 kΩ To: R3 = 14.302 kΩ in the Internal Temperature Sense (TS Function of the TS/CTRL Pin) section .................................................................................................................................................................................. 25 • Changed THOT = 0°C To: THOT = 60°C.................................................................................................................................. 25 • Changed Equation 6............................................................................................................................................................. 29 Changes from Revision B (September 2012) to Revision C • Page First release of the full data sheet .......................................................................................................................................... 1 Changes from Revision A (August 2012) to Revision B Page • Changed last features bullet from: 1.9 x 3.0mm WCSP and 4.5 x 3.5mm QFN Package Options to: Available in small WCSP and QFN packages ........................................................................................................................................... 1 • Changed Figure 1 and changed caption from: Wireless Power Consortium (WPC or Qi) Inductive Power Charging System, to: Typical System blocks shows bq5105xB used as a Wireless Power Li-Ion/Li-Pol Battery Charger................... 1 • Added note: Visit ti.com/wirelesspower for product details and design resources................................................................. 1 Changes from Original (August 2012) to Revision A Page • Changed Regulated BAT(output) voltage............................................................................................................................... 8 • Changed Recharge threshold for bq51052B .......................................................................................................................... 8 • Deleted ITS-Bias-Max .................................................................................................................................................................... 8 • Changed VCOLD to VOC and values ......................................................................................................................................... 8 • Changed V45C values .............................................................................................................................................................. 8 • Changed V60C values .............................................................................................................................................................. 8 • Changed Figure 25............................................................................................................................................................... 21 • Changed Figure 25............................................................................................................................................................... 22 Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 3 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com 5 Device Options DEVICE FUNCTION VRECT-OVP VRECT-REG VBAT-REG NTC MONITORING bq51050B 4.20-V Li-Ion Wireless Battery Charger 15 V Track 4.20 V JEITA bq51051B 4.35-V Li-Ion Wireless Battery Charger 15 V Track 4.35 V JEITA bq51052B 4.40-V Li-Ion Wireless Battery Charger 15 V Track 4.40 V Modified JEITA 6 Pin Configuration and Functions YFP Package 28-Pin DSBGA Top View 4 A PGND PGND PGND PGND B AC2 AC2 AC1 AC1 BAT BAT BAT COMM2 CLAMP2 CLAMP1 COMM1 F TS/CTRL FOD AD-EN CHG G ILIM EN2 TERM AD Submit Documentation Feedback BOOT1 3 18 RECT BAT 4 17 BOOT2 CLAMP1 5 16 CLAMP2 Thermal BOOT1 E 4 AC2 Pad COMM1 6 15 COMM2 CHG 7 14 FOD AD-EN 8 13 TS/CTRL AD 9 12 ILIM 11 RECT 19 EN2 BAT RECT 2 10 D BOOT2 AC1 TERM C PGND 3 20 2 PGND 1 1 RHL Package 20-Pin VQFN With Exposed Thermal Pad Top View The exposed thermal pad should be connected to ground. Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 Pin Functions Pin VQFN I/O DESCRIPTION NAME DSBGA AC1 B3, B4 2 I Input power from receiver coil. AC2 B1, B2 19 I Input power from receiver coil. AD G4 9 I If AD functionality is used, connect this pin to the wired adapter input. When VAD-Pres is applied to this pin wireless charging is disabled and AD_ENn is driven low. Connect a 1-µF capacitor from AD to PGND. If unused, the capacitor is not required and AD should be connected directly to PGND. AD-EN F3 8 O Push-pull driver for external PFET when wired charging is active. Float if not used. 4 O Output pin, delivers power to the battery while applying the internal charger profile. D1 BAT D2 D3 D4 BOOT1 C4 3 O BOOT2 C1 17 O Bootstrap capacitors for driving the high-side FETs of the synchronous rectifier. Connect a 10-nF ceramic capacitor from BOOT1 to AC1 and from BOOT2 to AC2. CHG F4 7 O Open-drain output – active when BAT is enabled. Float if not used. CLAMP1 E3 5 O CLAMP2 E2 16 O Open-drain FETs which are used for a non-power dissipative overvoltage AC clamp protection. When the RECT voltage goes above 15 V, both switches will be turned on and the capacitors will act as a low impedance to protect the device from damage. If used, capacitors are used to connect CLAMP1 to AC1 and CLAMP2 to AC2. Recommended connections are 0.47-µF capacitors. COMM1 E4 6 O COMM2 E1 15 O EN2 G2 11 I Used to set priority between wireless power and wired power. EN2 low enables wired charging source if AD input voltage is present. EN2 high disables wired charging source and wireless power is enabled if present. FOD F2 14 I Input for the rectified power measurement. See WPC v1.2 Compatibility for details. ILIM G1 12 I/O 1, 20 – Power ground Open-drain outputs used to communicate with primary by varying reflected impedance. Connect a capacitor from COMM1 to AC1 and a capacitor from COMM2 to AC2 for capacitive load modulation. For resistive modulation connect COMM1 and COMM2 to RECT through a single resistor. See Communication Modulator for more information. Programming pin for the battery charge current. The total resistance from ILIM to PGND (RILIM) sets the charge current. Figure 32 shows RILIM to be R1 + RFOD. Details can be found in Electrical Characteristics and Battery Charge Current Setting Calculations. A1 PGND A2 A3 A4 RECT C2, C3 18 O Filter capacitor for the internal synchronous rectifier. Connect a ceramic capacitor to PGND. Depending on the power levels, the value may be from 4.7 μF to 22 μF. TERM G3 10 I Input that is used to set the termination threshold. Termination current is the battery current level below which the charge process will cease. The termination current is set as a percentage of the charge current. See Battery Charge Current Setting Calculations for more details. Temperature Sense (TS) and Control (CTRL) pin functionality. For the TS functionality connect TS/CTRL to ground through a Negative Temperature Coefficient (NTC) resistor. If an NTC function is not desired, connect to PGND with a 10-kΩ resistor. As a CTRL pin pull low to send end power transfer (EPT) fault to the transmitter or pull up to an internal rail to send EPT termination to the transmitter. See Internal Temperature Sense (TS Function of the TS/CTRL Pin) for more details. TS/CTRL F1 13 I — — PAD — The exposed thermal pad should be connected to ground (PGND). Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 5 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com 7 Specifications 7.1 Absolute Maximum Ratings (1) (2) over operating free-air temperature range (unless otherwise noted) Input voltage MIN MAX UNIT RECT, COMM1, COMM2, BAT, CHG, CLAMP1, CLAMP2 –0.3 20 V AC1, AC2 –0.8 20 V AD, AD-EN –0.3 30 V BOOT1, BOOT2 –0.3 26 V EN2, TERM, FOD, TS/CTRL, ILIM –0.3 7 V 2 A(RMS) 1.5 A CHG 15 mA COMM1, COMM2 1.0 A Input current AC1, AC2 Output current BAT Output sink current Junction temperature, TJ –40 150 °C Storage temperature, Tstg –65 150 °C (1) (2) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltages are with respect to the VSS terminal, unless otherwise noted. 7.2 ESD Ratings VALUE V(ESD) (1) (2) Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 Electrostatic discharge (1) UNIT ±2000 Charged-device model (CDM), per JEDEC specification JESD22-C101 (2) V ±500 JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. 7.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) VIN Input voltage range RECT IIN Input current Internal Rectifier (voltage monitored at RECT node) MIN MAX UNIT 4 10 V 1.5 A bq51050B, bq51051B 1.5 bq51052B 0.8 IBAT BAT(output) current BAT VAD Adapter voltage AD 15 V IAD-EN Sink current AD-EN 1 mA ICOMM COMM sink current COMM 500 mA TJ Junction temperature 125 °C 0 A 7.4 Thermal Information bq51050B, bq51051B, bq51052B THERMAL METRIC (1) YFP (DSGBA) RHL (VQFN) 28 PINS 20 PINS UNIT RθJA Junction-to-ambient thermal resistance 58.9 37.7 °C/W RθJC(top) Junction-to-case (top) thermal resistance 0.2 35.5 °C/W RθJB Junction-to-board thermal resistance 9.1 13.6 °C/W ψJT Junction-to-top characterization parameter 1.4 0.5 °C/W ψJB Junction-to-board characterization parameter 8.9 13.5 °C/W (1) 6 For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report. Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 Thermal Information (continued) bq51050B, bq51051B, bq51052B THERMAL METRIC (1) RθJC(bot) YFP (DSGBA) RHL (VQFN) 28 PINS 20 PINS n/a 2.7 Junction-to-case (bottom) thermal resistance UNIT °C/W 7.5 Electrical Characteristics Over junction temperature range 0°C ≤ TJ ≤ 125°C and recommended supply voltage (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX 2.6 2.7 2.8 UNIT VUVLO Undervoltage lockout VRECT: 0 V → 3 V VHYS-UVLO Hysteresis on UVLO VRECT: 3 V → 2 V VOVP Input overvoltage threshold VRECT: 5 V → 16 V VHYS-OVP Hysteresis on OVP VRECT: 16 V → 5 V VRECT-REG (1) VRECT regulation voltage ILOAD ILOAD Hysteresis for dynamic VRECT thresholds as a % of IILIM ILOAD falling 5% VTRACK Tracking VRECT regulation above VBAT VBAT = 3.5 V, IBAT ≥ 500 mA 300 VRECT-REV Rectifier reverse voltage protection at the BAT(output) VRECT-REV = VBAT – VRECT, VBAT = 10 V 8.3 9 V VRECT-DPM Rectifier undervoltage protection, restricts IBAT at VRECT-DPM 3.1 3.2 V IBAT = 0 mA, 0°C ≤ TJ ≤ 85°C 8 10 mA IBAT = 300 mA, 0°C ≤ TJ ≤ 85°C 2 3 mA 12 20 µA 250 14.5 3 15 V mV 15.5 V 150 mV 5.11 V mV QUIESCENT CURRENT IRECT Active chip quiescent current consumption from RECT (when wireless power is present) IQ Quiescent current at the BAT when wireless power is disabled (Standby) VBAT = 4.2 V, 0°C ≤ TJ ≤ 85°C ILIM SHORT PROTECTION RILIM-SHORT tDGL-Short ILIM_SHORT, OK Highest value of ILIM resistor considered a fault (short). Monitored for IBAT > ILIM_SHORT, OK RILIM: 200 Ω → 50 Ω. IBAT latches off, cycle power to reset bq51050B, bq51051B 120 bq51052B 235 Deglitch time transition from ILIM short to IBAT disable 1 ms bq51050B, bq51051B 110 145 165 bq51052B 55 75 95 ILIM-SHORT,OK enables the IILIM short comparator when IBAT is greater than this value IBAT: 0 mA → 200 mA Hysteresis for ILIM-SHORT,OK comparator IBAT: 200 mA → 0 mA Maximum output current limit Maximum IBAT that will be delivered for up to 1 ms when ILIM is shorted to PGND Ω mA ILIM-SHORT, OK 30 mA HYSTERESIS IBAT-CL 2.4 A BATTERY SHORT PROTECTION VBAT(SC) BAT pin short-circuit detection/precharge threshold VBAT: 3 V → 0.5 V, no deglitch VBAT(SC)-HYS VBAT(SC) hysteresis VBAT: 0.5 V → 3 V IBAT(SC) Source current to BAT pin during short-circuit detection VBAT = 0 V 0.75 0.8 0.85 100 V mV bq51050B, bq51051B 12 18 22 bq51052B 12 18 25 mA VOLTAGE REGULATION PHASE IEndTrack (1) IBAT threshold during Voltge Regulation Phase that changes VRECT level from VBAT+VTRACK to VRECT-REG IBAT decreasing bq51050B, bq51051B 0.35 * IBULK bq51052B 0.05 * IBULK mA VRECT-REG is overridden when rectifier foldback mode is active (VRECT-REG-VTRACK). Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 7 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com Electrical Characteristics (continued) Over junction temperature range 0°C ≤ TJ ≤ 125°C and recommended supply voltage (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX 2.9 3.0 3.1 18% 20% 23% UNIT PRECHARGE VBAT: 2 V → 4 V VLOWV Precharge to fast charge transition threshold KPRECHG Precharge current as a percentage of the programmed VLOWV > VBAT > VBAT(SC) charge current setting (IBULK) IBAT: 50 mA – 300 mA IPRECHG IBAT during precharge VLOWV > VBAT > VBAT(SC), IBULK = 500 mA tprecharge Precharge time-out VBAT(SC) < VBAT < VLOWV tDGL1(LOWV) tDGL2(LOWV) V 100 mA 30 min Deglitch time, pre- to fast-charge 25 ms Deglitch time, fast- to precharge 25 ms OUTPUT VOREG Regulated BAT(output) voltage VDO IBAT = 1000 mA Drop-out voltage, RECT to BAT KILIM 4.16 4.20 4.22 bq51051B 4.30 4.35 4.37 bq51052B 4.36 4.40 4.44 110 190 mV 314 321 AΩ IBAT = 1 A Current programming factor IBULK bq51050B Battery charging current limits RLIM = KILIM / IIBULK (500 mA - 1.5 A) bq51050B, bq51051B RLIM = KILIM / IIBULK (500 mA - 1.0 A) bq51052B KILIM 303 to 321 tfast-charge Fast-charge timer IBAT-R Battery charge current limit programming range ICOMM-CL Current limit during communication 303 bq51050B, bq51051B 500 1,500 bq51052B 500 1,000 VLOWV < VBAT < VBAT-REG 10 V mA hours 1500 mA 330 390 420 mA 200 240 280 Ω/% TERMINATION KTERM Programmable termination current as a percentage of IIBULK RTERM = %IIBULK x KTERM (IBULK = 500 mA) ITERM-Th Termination current from BAT, defined with KTERM, as the current that terminates the charge cycle IBAT decreasing, RTERM = 2.4k Ω, IBULK = 1000 mA ITERM Constant current at the TERM pin to bias the termination reference VRECH Recharge threshold ITermination 100 mA 40 50 55 bq51050B VBAT-REG –135mV VBAT-REG –110mV VBAT-REG –90mV bq51051B VBAT-REG –125mV VBAT-REG –95mV VBAT-REG –70mV bq51052B VBAT-REG –125mV VBAT-REG –95mV VBAT-REG –70mV Termination current setting limits 120 µA V mA TS / CTRL FUNCTIONALITY VTSB Internal TS bias voltage (VTS is the voltage at the TS/CTRL pin, VTSB is the internal bias voltage) ITSB< 100 µA (periodically driven see tTS/CTRL-Meas) V0C-R Rising threshold VTS: 50% → 60% V0C-Hyst Hysteresis on 0°C Comparator VTS: 60% → 50% V10C Rising threshold VTS: 40% → 50% V10C-Hyst Hysteresis on 10°C Comparator VTS: 50% → 40% V45C Falling threshold VTS: 25% → 15% V45C-Hyst Hysteresis on 45°C Comparator VTS: 15% → 25% V60C Falling threshold VTS: 20% → 5% V60C-Hyst Hysteresis on 60°C Comparator VTS: 5% → 20% I45C IBULK reduction percentage at 45°C (in full JEITA mode VTS: 25% → 15%, IBAT = IBULK - N/A for bq51052B) VO-J Voltage regulation during JEITA temperature range VCTRL-HI 8 2.2 2.4 V 57 58.7 60 %VTSB 2.4 46 47.8 %VTSB 49 2 18 19.6 12 13.1 50% bq51050B 4.06 bq51051B 4.2 bq51052B 4.2 0.2 %VTSB %VTSB 14 1 45% %VTSB %VTSB 21 3 Voltage on CTRL pin for a high Submit Documentation Feedback 2 %VTSB %VTSB 55% V 5 V Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 Electrical Characteristics (continued) Over junction temperature range 0°C ≤ TJ ≤ 125°C and recommended supply voltage (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP 0 MAX Voltage on CTRL pin for a low tTS/CTRL-Meas Time period of TS/CTRL measurements (when VTSB is TS bias voltage is only driven when being driven internally) communication packets are sent 24 ms tTS-Deglitch Deglitch time for all TS comparators 10 ms NTC-Pullup Pullup resistor for the NTC network. Pulled up to the TS bias LDO. NTC-RNOM Nominal resistance requirement at 25°C of the NTC resistor 10 kΩ NTC-Beta Beta requirement for accurate temperature sensing through the above specified thresholds 3380 Ω 155 °C 20 °C 18 0.1 UNIT VCTRL-LOW 20 22 V kΩ THERMAL PROTECTION TJ-SD Thermal shutdown temperature TJ-Hys Thermal shutdown hysteresis OUTPUT LOGIC LEVELS ON CHG VOL IOFF,CHG Open-drain CHG pin ISINK = 5 mA CHG leakage current when disabled VCHG = 20 V, 0°C ≤ TJ ≤ 85°C COMM1 and COMM2 VRECT = 2.6 V 500 mV 1 µA COMM PIN RDSON(COMM) fCOMM IOFF,COMM Signaling frequency on COMM pin 1 Ω 2 kb/s VCOMM1 = 20 V, VCOMM2 = 20 V COMM pin leakage current 1 µA CLAMP PIN RDS- CLAMP1 and CLAMP2 0.75 Ω ON(CLAMP) ADAPTER ENABLE VAD-Pres VAD Rising threshold voltage. EN-UVLO VAD 0 V → 5 V VAD-PresH VAD-Pres hysteresis, EN-HYS VAD 5 V → 0 V IAD Input leakage current VRECT = 0 V, VAD = 5 V RAD Pullup resistance from AD-EN to BAT when adapter mode is disabled and VBAT > VAD, EN-OUT VAD = 0 V, VBAT = 5 V VAD-Diff Voltage difference between VAD and VAD-EN when adapter mode is enabled, EN-ON VAD = 5 V, 0°C ≤ TJ ≤ 85°C 3.5 3.6 3.8 400 V mV 60 µA 200 350 Ω 3 4.5 5 V bq51050B, bq51051B 80 115 140 bq51052B 20 50 65 SYNCHRONOUS RECTIFIER IBAT-SR IBAT at which the synchronous rectifier enters half synchronous mode, SYNC_EN IBAT-SRH Hysteresis for IBAT,SR (full-synchronous mode enabled) VHS-DIODE High-side diode drop when the rectifier is in half synchronous mode IBAT 200 mA → 0 mA IBAT 0 mA → 200 mA bq51050B, bq51051B 25 bq51052B 28 IAC-VRECT = 250 mA, and TJ = 25°C 0.7 mA V EN2 VIL Input low threshold for EN2 VIH Input high threshold for EN2 RPD, EN EN2 pulldown resistance 0.4 1.3 V V 200 kΩ 0.25 W ADC PowerREC 0 W – 5 W received power after calibration of Rx magnetics losses Received power measurement Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 9 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com 7.6 Typical Characteristics 100 100 90 90 80 Efficiency (%) Efficiency (%) 70 80 70 60 60 50 40 30 20 50 Pre-charge & fast charge mode Taper mode 10 40 0 0 0.00 5 4 2 3 Output Power (W) Figure 1. Rectifier Efficiency 1 2.00 3.00 4.00 5.00 Output Power (W) Figure 2. IC Efficiency (AC Input to DC Output) 5.50 1.00 6.0 5.00 Rectifier Voltage (V) Vrect and Vbat (V) 5.0 Vrect 4.50 4.00 3.50 3.00 Vbat 4.0 3.0 2.50 Pre-charge & fast charge mode Taper mode 2.0 Precharge & fast charge mode Taper mode 2.00 1.50 0.00 RILIM=600W 0.20 0.40 0.60 0.80 1.00 Output Current (A) Figure 3. VRECT, VBAT versus Output Current 1.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 Output Current (A) Figure 4. VRECT versus Output Current at RILIM=600 Ω (ILIM = 523 mA) 0.008 70 Pre-charge & fast charge mode Taper mode 0.007 60 0.005 Efficiency (%) Output Ripple (V) 0.006 0.004 0.003 50 40 30 0.002 20 0.001 0 10 0 0.2 0.4 0.6 0.8 1 1.2 Output Current (A) Figure 5. Output Ripple versus Output Current 10 Submit Documentation Feedback 4 2 3 Output Power (W) Figure 6. System Efficiency (DC Input to DC Output) 0 1 Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 100% 100% 90% 90% 80% 80% 70% 70% 60% 60% Efficiency Efficiency Typical Characteristics (continued) 50% 40% 40% 30% 30% 20% 20% 10% 10% 0 0 3 3.3 3.6 3.9 4.2 VBAT (V) 4.5 0 0.06 D001 Figure 7. bq51052B 300-mA Fast Charge Efficiency (DC Input to DC Output) 100% 100% 90% 90% 80% 80% 70% 70% 60% 60% 50% 40% 0.24 0.3 D001 50% 40% 30% 30% 20% 20% 10% 10% 0 0.12 0.18 IBAT during Taper Mode (A) Figure 8. bq51052B 300-mA Taper Charge Efficiency (DC Input to DC Output) Efficiency Efficiency 50% 0 3 3.3 3.6 3.9 VBAT (V) 4.2 4.5 D001 Figure 9. bq51052B 800-mA Fast Charge Efficiency (DC Input to DC Output) 0 0.2 0.4 0.6 IBAT during Taper Mode (A) 0.8 1 D001 Figure 10. bq51052B 800-mA Taper Charge Efficiency (DC Input to DC Output) VRECT VRECT VBAT VBAT IBAT IBAT Figure 11. Battery Insertion in Precharge Mode Figure 12. Battery Insertion in Fast-Charge Mode Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 11 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com Typical Characteristics (continued) VRECT VRECT VTS/CTRL VTS/CTRL VBAT VBAT IBAT IBAT Figure 13. TS Fault Figure 14. TS Ground Fault VTS/CTRL VRECT VRECT VBAT IBAT VBAT IBAT Figure 15. Precharge to Fast-Charge Transition Figure 16. JEITA Functionality (Rising Temp) bq51050B/bq51051B VRECT VRECT VTS/CTRL VBAT IBAT Figure 17. JEITA Functionality (Falling Temp) bq51050B/bq51051B 12 Submit Documentation Feedback IBAT VBAT Figure 18. Battery Short to Precharge Mode Transition Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 8 Detailed Description 8.1 Overview 8.1.1 A Brief Description of the Wireless System A wireless system consists of a charging pad (primary, transmitter) and the secondary-side equipment. There are coils in the charging pad and in the secondary equipment which magnetically couple to each other when the equipment is placed on the charging pad. Power is transferred from the primary to the secondary by transformer action between the coils. Control over the amount of power transferred is achieved by changing the frequency of the primary drive. The secondary can communicate with the primary by changing the load seen by the primary. This load variation results in a change in the primary coil current, which is measured and interpreted by a processor in the charging pad. The communication is digital - packets are transferred from the secondary to the primary. Differential biphase encoding is used for the packets. The rate is 2-kbps. Various types of communication packets have been defined. These include identification and authentication packets, error packets, control packets, power usage packets, end of power packet and efficiency packets. The primary coil is powered off most of the time. It wakes up occasionally to see if a secondary is present. If a secondary authenticates itself to the primary, the primary remains powered up. The secondary maintains full control over the power transfer using communication packets. Power AC to DC Drivers bq5105x Rectification Voltage/ Current Conditioning System Communication Controller V/I Sense Controller Battery Charger LI-Ion Battery bq500210 Transmitter Receiver Figure 19. WPC Wireless Power Charging System Indicating the Functional Integration of the bq5105x Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 13 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com 8.2 Functional Block Diagram , BAT VREF,ILIM VILIM VOUT,FB + _ + _ RECT VOUT,REG VREF,IABS VIABS,FB + _ VIN,FB VIN,DPM + _ ILIM AD + _ VREFAD,OVP BOOT2 + _ BOOT1 VREFAD,UVLO AD-EN AC1 AC2 Sync Rectifier Control VREF,TS-BIAS VFOD + _ COMM1 TS_0 COMM2 DATA_ OUT ADC CLAMP1 CLAMP2 VBG,REF VIN,FB VOUT,FB VILIM VIABS,FB TS_10 TS_45 VIABS,REF VIC,TEMP Digital Control and Charger TS_60 VFOD TS_DETECT 50µ A + _ + _ + _ + _ TS/CTRL + _ + _ VREF_100MV VRECT VOVP,REF TERM + OVP TERM CHG FOD ILIM _ EN2 200k: PGND Copyright © 2016, Texas Instruments Incorporated 8.3 Feature Description 8.3.1 Using the bq5105x as a Wireless Li-Ion/Li-Pol Battery Charger (With Reference to Functional Block Diagram) Functional Block Diagram is the schematic of a system which uses the bq5105x as a direct battery charger. When the system shown in Functional Block Diagram is placed on the charging pad (transmitter), the receiver coil couples to the magnetic flux generated by the coil in the charging pad which consequently induces a voltage in the receiver coil. The internal synchronous rectifier feeds this voltage to the RECT pin which has the filter capacitor C3. 14 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 Feature Description (continued) The bq5105x identifies and authenticates itself to the primary using the COMM pins by switching on and off the COMM FETs and hence switching in and out CCOMM. If the authentication is successful, the transmitter will remain powered on. The bq5105x measures the voltage at the RECT pin, calculates the difference between the actual voltage and the desired voltage VRECT-REG and sends back error packets to the primary. This process goes on until the RECT voltage settles at VRECT-REG. During power-up, the LDO is held off until the VRECT-REG threshold converges. The voltage control loop ensures that the output (BAT) voltage is maintained at VBAT-REG. The values of VBAT and VRECT are dependant on the battery charge mode. The bq5105x continues to monitor the VRECT and VBAT and sends error packets to the primary every 250 ms. The bq5105x regulates the VRECT voltage very close to battery voltage, this voltage tracking process minimizes the voltage difference across the internal LDO and maximizes the charging efficiency. If a large transient occurs, the feedback to the primary speeds up to every 32 ms in order to converge on an operating point in less time. 8.3.2 Details of a Qi Wireless Power System and bq5105xB Power Transfer Flow Diagrams The bq5105xB integrates a fully compliant WPC v1.2 communication algorithm in order to streamline receiver designs (no extra software development required). Other unique algorithms such as Dynamic Rectifier Control are also integrated to provide best-in-class system performance. This section provides a high level overview of these features by illustrating the wireless power transfer flow diagram from start-up to active operation. During start-up operation, the wireless power receiver must comply with proper handshaking to be granted a power contract from the TX. The TX will initiate the handshake by providing an extended digital ping. If an RX is present on the TX surface, the RX will then provide the signal strength, configuration and identification packets to the TX (see volume 1 of the WPC specification for details on each packet). These are the first three packets sent to the TX. The only exception is if there is a shutdown condition on the EN1/EN2, AD, or TS/CTRL pins where the Rx will shut down the TX immediately. Once the TX has successfully received the signal strength, configuration and identification packets, the RX will be granted a power contract and is then allowed to control the operating point of the power transfer. With the use of the bq5105xB Dynamic Rectifier Control algorithm, the RX will inform the TX to adjust the rectifier voltage above 5 V before enabling the output supply. This method enhances the transient performance during system start-up. See Figure 20 for the start-up flow diagram details. Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 15 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com Feature Description (continued) TX Powered without RX Active TX Extended Digital Ping EN2/AD/TS/CTRL EPT Condition? YES Send EPT packet with reason value NO Identification & Configuration & SS, Received by TX? NO YES Power Contract Established. All proceeding control is dictated by the RX. VRECT < VRECT-REG ? YES Send control error packet to increase VRECT NO Startup operating point established. Enable the RX output. RX Active Power Transfer Stage Figure 20. Wireless Power Start-up Flow Diagram 16 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 Feature Description (continued) Once the start-up procedure has been established, the RX will enter the active power transfer stage. This is considered the “main loop” of operation. The Dynamic Rectifier Control algorithm will determine the rectifier voltage target based on a percentage of the maximum output current level setting (set by KILIM and the IILIM resistance to PGND). The RX will send control error packets in order to converge on these targets. As the output current changes, the rectifier voltage target will dynamically change. As a note, the feedback loop of the WPC system is relatively slow where it can take up to 90 ms to converge on a new rectifier voltage target. It should be understood that the instantaneous transient response of the system is open loop and dependent on the RX coil output impedance at that operating point. More details on this will be covered in the section Receiver Coil LoadLine Analysis. The “main loop” will also determine if any conditions are true and will then discontinue the power transfer. Figure 21 shows the active power transfer loop. RX Active Power Transfer Stage RX Shutdown conditions per the EPT Table? YES Send EPT packet with reason value YES VRECT target = VRECT-REG. Send control error packets to converge. YES VRECT target = VBAT + VTRACK. Send control error packets to converge. TX Powered without RX Active NO VBAT < VLOWV NO IBAT > KPRECHG% of IBULK? NO VRECT target = VRECT-REG. Send control error packets to converge. Measure Rectified Power and Send Value to TX TERM STATE Figure 21. Active Power Transfer Flow Diagram Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 17 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com Feature Description (continued) Power Transfer VILIM < VTERM? NO VBAT > VRECH? YES YES Send EPT Charge Complete NO VBAT < VBAT(SC) YES VRECT Target = VRECT-REG IBAT = IBAT(SC) YES VRECT Target = VRECT-REG IOUT = IPRECHG NO VBAT(SC) < VBAT < VLOWV NO NO VLOWV < VBAT < VOREG YES VRECT Target = VBAT + VTRACK IBAT = IBULK NO IBAT < IEndTrack? YES VRECT Target = VRECT-REG NO AD / TS/CTRL EPT Condition? YES Send EPT Figure 22. TERM STATE Flow Diagram of bq5105XB 18 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 Feature Description (continued) 8.3.3 Battery Charge Profile The battery is charged in three phases: precharge, fast-charge constant current and constant voltage. A voltagebased battery pack thermistor monitoring input (TS function of the TS/CTRL pin) is included that monitors battery temperature for safe charging. The TS function for bq51050B and bq51051B is JEITA compatible. The TS function for the bq51052B modifies the current regulation differently than standard JEITA. See Battery-Charger Safety and JEITA Guidelines for more details. The rectifier voltage follows BAT voltage plus VTRACK for any battery voltage above VLOWV to full regulation voltage and most of the taper charging phase. If the battery voltage is below VLOWV the rectifier voltage increases to VRECT-REG. If IBAT is less than IEndTrack (a percentage of IBULK) during taper mode, the rectifier voltage increases to VRECT-REG. The charge profile for the bq51050B and bq51051B is shown in Figure 23 while the bq51052B is shown in Figure 24. VRECT-REG Pre-charge Current Regulation Phase Voltage Regulation Phase Phase VRECT = VBAT + VTRACK VRECT = VRECT-REG VRECT = VRECT-REG VOREG VBAT = VOREG IBAT = IBULK IBulk VRECT = VBAT + VTRACK VBAT VLOWV VBAT(SC) VBAT IEndTrack IBAT = Taper IBAT IBAT = Off VRECT-REG Exits VRECT-TRACK ITERM-Th IPRECHG IBAT(SC) TX Off VRECT-TRACK Figure 23. bq51050B and bq51051B Li-Ion Battery Charge Profile VRECT-REG Pre-charge Current Regulation Phase Phase VRECT = VRECT-REG Voltage Regulation Phase VRECT = VBAT + VTRACK VOREG VBAT = VOREG IBAT = IBULK IBulk VRECT = VBAT + VTRACK VBAT VLOWV VBAT(SC) VBAT IBAT = Taper IBAT IBAT = Off VRECT-REG VRECT-TRACK ITERM-Th IPRECHG IBAT(SC) TX Off Figure 24. bq51052B Li-Ion Battery Charge Profile Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 19 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com Feature Description (continued) 8.3.4 Battery Charging Process 8.3.4.1 Precharge Mode (VBAT ≤ VLOWV) The bq5105X enters precharge mode when VBAT ≤ VLOWV. Upon entering precharge mode, battery charge current limit is set to IPRECHG. During precharge mode, the charge current is regulated to KPRECHG percent of the fast charge current (IBULK) setting. For example, if IBULK is set to 800 mA, then the precharge current would have a typical value of 160 mA. If the battery is deeply discharged or shorted (VBAT < VBAT(SC)), the bq5105X applies IBAT(SC) current to bring the battery voltage up to acceptable charging levels. Once the battery rises above VBAT(SC), the charge current is regulated to IPRECHG. Under normal conditions, the time spent in this precharge region is a very short percentage of the total charging time and this does not affect the overall charging efficiency for very long. 8.3.4.2 Fast Charge Mode / Constant Voltage Mode Once VBAT > VLOWV, the bq5105x enters fast charge mode (Current Regulation Phase) where charge current is regulated using the internal MOSFETs between RECT and BAT. Once the battery voltage charges up to VBATREG, the bq5105x enters constant voltage (CV) phase and regulates battery voltage to VOREG and the charging current is reduced. Once IBAT falls below the termination threshold (ITERM-Th), the charger sends an EPT (Charge Complete) notification to the TX and enters high impedance mode. 8.3.4.3 Battery Charge Current Setting Calculations 8.3.4.3.1 RILIM Calculations The bq5105x includes a means of providing hardware overcurrent protection by means of an analog current regulation loop. The hardware current limit provides an extra level of safety by clamping the maximum allowable output current (for example, a current compliance). The calculation for the total RILIM resistance is as follows: KILIM R1 = KILIM t RFOD RILIM = R1 + RFOD IBULK = IBULK RILIM (1) Where IBULK is the programmed battery charge current during fast charge mode. When referring to the application diagram shown in Figure 32, RILIM is the sum of RFOD and R1 (the total resistance from the ILIM pin to PGND). 8.3.4.3.2 Termination Calculations The bq5105X includes a programmable upper termination threshold. The upper termination threshold is calculated using Equation 2: RTERM = KTERM * %IBULK R %IBULK = KTERM TERM (2) The KTERM constant is specified in Electrical Characteristics as 240 Ω/%. The upper termination threshold is set as a percentage of the charge current setting (IBULK). For example, if RILIM is set to 314 Ω, IBULK will be 1 A (314 ÷ 314). If the upper termination threshold is desired to be 100 mA, this would be 10% of IBULK. The RTERM resistor would then equal 2.4 kΩ (240 × 10). Termination can be disabled by floating the TERM pin. If the TERM pin is grounded the termination function is effectively disabled. However, due to offsets of internal comparators, termination may occur at low battery currents. 20 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 Feature Description (continued) 8.3.4.4 Battery-Charger Safety and JEITA Guidelines The bq5105x continuously monitors battery temperature by measuring the voltage between the TS/CTRL pin and PGND. A negative temperature coefficient thermistor (NTC) and an external voltage divider typically develop this voltage. The bq5105x compares this voltage against its internal thresholds to determine if charging is allowed. To initiate a charge cycle, the voltage on TS/CTRL pin (VTS) must be within the VT1 to VT4 thresholds. If VTS is outside of this range, the bq5105x suspends charge and waits until the battery temperature is within the VT1 to VT4 range. Additional information on the Temperature Sense function can be found in Internal Temperature Sense (TS Function of the TS/CTRL Pin). 8.3.4.4.1 bq51050B and bq51051B JEITA If VTS is within the ranges of VT1 and VT2 or VT3 and VT4, the charge current is reduced to IBULK/2. If VTS is within the range of VT1 and VT3, the maximum charge voltage regulation is VOREG. If VTS is within the range of VT3 and VT4, the maximum charge voltage regulation is reduced to "NEW SPEC". Figure 25 summarizes the operation. Charge Current: IBULK IBULK / 2 IBULK / 2 0A Charge Voltage: VOREG VO-J 0V T1 (0° C) T2 (10° C) T3 (45° C) T4 (60° C) Figure 25. JEITA Compatible TS Profile for bq51050B and bq51051B 8.3.4.4.2 bq51052B Modified JEITA The bq51052B has a modififed JEITA profile. The maximum charge current is not modified between VT1 and VT2 or between VT3 and VT4, it remains at IBULK. The maximum charge voltage is reduced to VO-J when the VTS is between VT3 and VT4. Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 21 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com Feature Description (continued) Charge Current: IBULK 0A Charge Voltage: VOREG VO-J 0V T1 (0° C) T2 (10° C) T3 (45° C) T4 (60° C) Figure 26. JEITA Compatible TS Profile for bq51052B 8.3.4.5 Input Overvoltage If, for some condition (for example, a change in position of the equipment on the charging pad), the rectifier voltage suddenly increases in potential, the voltage-control loop inside the bq5105x becomes active, and prevents the output from going beyond VBAT-REG. The receiver then starts sending back error packets every 32 ms until the RECT voltage comes back to an acceptable level, and then maintains the error communication every 250 ms. If the input voltage increases in potential beyond VOVP, the device switches off the internal FET and communicates to the primary to bring the voltage back to VRECT-REG. In addition a proprietary voltage protection circuit is activated by means of CCLAMP1 and CCLAMP2 that protects the device from voltages beyond the maximum rating. 8.3.4.6 End Power Transfer Packet (WPC Header 0x02) The WPC allows for a special command to terminate power transfer from the TX termed End Power Transfer (EPT) packet. WPC v1.2 specifies the reasons for sending a termination packet and their data field value. In Table 1, the CONDITION column corresponds to the stimulus causing the bq5105x device to send the hexidecimal code in the VALUE column. Table 1. Termination Packets REASON VALUE Unknown 0x00 AD > VAD-Pres, TS/CTRL = VCTRL-HI Charge Complete 0x01 IBAT falls below ITERM-Th during Taper mode Internal Fault 0x02 TJ > 150°C or RILIM < RILIM-SHORT Overtemperature 0x03 TS < VHOT, TS > VCOLD, or TS/CTRL < VCTRL-LOW Overvoltage 0x04 Not Sent Overcurrent 0x05 Not Sent Battery failure 0x06 Battery is not coming out of precharge mode after Precharge time-out, or fast charge time-out has occured. Reconfigure 0x07 Not Sent No Response 0x08 VRECT target does not converge 22 Submit Documentation Feedback CONDITION Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 8.3.4.7 Status Output The bq5105x provides one status output, CHG. This output is an open-drain NMOS device that is rated to 20 V. The open-drain FET connected to the CHG pin will be turned on whenever the output (BAT) of the charger is enabled. As a note, the output of the charger supply will not be enabled if the VRECT-REG does not converge to the no-load target voltage. 8.3.4.8 Communication Modulator The bq5105x provides two identical, integrated communication FETs which are connected to the pins COMM1 and COMM2. These FETs are used for modulating the secondary load current which allows bq5105x to communicate error control and configuration information to the transmitter.There are two methods to implement load modulation, capacitive and resistive. Capacitive load modulation is more commonly used. Capacitive load modulation is shown in Figure 27. In this case, a capacitor is connected from COMM1 to AC1 and from COMM2 to AC2. When the COMM switches are closed there is effectively a 22 nF capacitor connected between AC1 and AC2. Connecting a capacitor in between AC1 and AC2 modulates the impedance seen by the coil, which will be reflected to the primary and interpreted by the controller as a change in current. AC1 AC2 47 nF 47 nF COMM1 COMM2 COMM_DRIVE Figure 27. Capacitive Load Modulation Figure 28 shows how the COMM pins can be used for resistive load modulation. Each COMM pin can handle at most a 24 Ω communication resistor. Therefore, if a COMM resistor between 12 Ω and 24 Ω is required, COMM1 and COMM2 pins must be connected in parallel. bq5105x does not support a COMM resistor less than 12 Ω. RECTIFIER 24 : 24 : COMM1 COMM2 COMM_DRIVE Figure 28. Resistive Load Modulation Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 23 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com 8.3.4.9 Adaptive Communication Limit The Qi communication channel is established through backscatter modulation as described in the previous sections. This type of modulation takes advantage of the loosely coupled inductor relationship between the RX and TX coils. Essentially, the switching in-and-out of the communication capacitor or resistor adds a transient load to the RX coil in order to modulate the TX coil voltage and current waveform (amplitude modulation). The consequence of this technique is that a load transient (load current noise) from the mobile device has the same signature. To provide noise immunity to the communication channel, the output load transients must be isolated from the RX coil. The proprietary feature Adaptive Communication Limit achieves this by dynamically adjusting the current limit of the regulator. This can be seen in Figure 12. In this plot, an output load is limited to 400 mA during communications time. The pulses on VRECT indicate that a communication packet event is occurring. The regulator limits the load to a constant 400 mA and, therefore, preserves communication. 8.3.4.10 Synchronous Rectification The bq5105x provides an integrated, self-driven synchronous rectifier that enables high-efficiency AC to DC power conversion. The rectifier consists of an all NMOS H-Bridge driver where the back gates of the diodes are configured to be the rectifier when the synchronous rectifier is disabled. During the initial start-up of the WPC system the synchronous rectifier is not enabled. At this operating point, the DC rectifier voltage is provided by the diode rectifier. Once VRECT is greater than VUVLO, half synchronous mode will be enabled until the load current surpasses IBAT-SR. Above IBAT-SR the full synchronous rectifier stays enabled until the load current drops back below the hysteresis level (IBAT-SRH) where half synchronous mode is re-enabled. 8.3.4.11 Internal Temperature Sense (TS Function of the TS/CTRL Pin) The bq5105x includes a ratiometric battery temperature sense circuit. The temperature sense circuit has two ratiometric thresholds which represent hot and cold conditions. An external temperature sensor is recommended to provide safe operating conditions to the receiver product. This pin is best used when monitoring the battery temperature. The circuits in Figure 29 allow for any NTC resistor to be used with the given VHOT and VCOLD thresholds. The thermister characteristics and threshold temperatures selected will determine which circuit is best for an application. VTSB 20 lQ VTSB R2 20 lQ TS/CTRL R2 TS/CTRL R1 R1 R3 C3 C3 NTC NTC Figure 29. NTC Circuit Options for Safe Operation of the Wireless Receiver Power Supply 24 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 The resistors R1 and R3 can be solved by resolving the system of equations at the desired temperature thresholds. The two equations are: æ R R + R1 ö ç 3 NTC TCOLD ÷ çR + R ÷ R + 3 NTC TCOLD 1 ø è ´ 100 %VCOLD = æ R R + R1 ö 3 NTC TCOLD ç ÷ + R2 çR + R ÷ NTC TCOLD + R1 ø è 3 (3) ( ( ) ) ( ) ( ) æ R (R + R1 ) ö ç 3 NTC THOT ÷ çR + R ÷ R + 3 ( NTC THOT 1 )ø ´ 100 %VHOT = è æ R (R ö R + ) 1 ÷ ç 3 NTC THOT + R2 çR + R + R1 )÷ ( 3 NTC THOT è ø (4) Where: RNTC TCOLD RNTC THOT b = Ro e (1TCOLD - 1To ) b = Ro e (1THOT - 1To ) TCOLD and THOT are the desired temperature thresholds in degrees Kelvin. Ro is the nominal resistance at T0 (25°C) and β is the temperature coefficient of the NTC resistor. For an example solution for part number ERTJZEG103JA see the BQ5105XB NTC Calculator Tool, (SLUS629). Where, TCOLD = 0°C (273.15°K) THOT = 60°C (333.15°K) β = 3380 Ro = 10 kΩ The plot of the percent VTSB versus temperature is shown in Figure 30: Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 25 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com Figure 30. Example Solution for Panasonic Part # ERT-JZEG103JA Figure 31 shows the periodic biasing scheme used for measuring the TS state. An internal TS_READ signal enables the TS bias voltage for 25 ms. During this period the TS comparators are read (each comparator has a 10-ms deglitch) and appropriate action is taken based on the temperature measurement. After this 25-ms period has elapsed the TS_READ signal goes low, which causes the TS/CTRL pin to become high impedance. During the next 100-ms period, the TS voltage is monitored and compared to VCTRL-HI. If the TS voltage is greater than VCTRL-HI then a secondary device is driving the TS/CTRL pin and a CTRL = 1 is detected. 240ms Figure 31. Timing Diagram for TS Detection Circuit 8.3.4.11.1 TS/CTRL Function The TS/CTRL pin offers three functions: • NTC temperature monitoring • Charge done indication • Fault indication When an NTC resistor is connected between the TS/CTRL pin and PGND, the NTC function is allowed to operate. This functionality can effectively be disabled by connecting a 10 kΩ resistor from TS/CRTL to PGND. If the TS/CTRL pin is pulled above VCTRL-HI, the RX is shut down with the indication of a charge complete condition. If the TS/CTRL pin is pulled below VCTRL-LOW, the RX is shut down with the indication of a fault. 26 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 8.3.4.11.2 Thermal Protection The bq5105x includes thermal shutdown protection. If the die temperature reaches TJ-SD, the LDO is shut off to prevent any further power dissipation. Once the temperature falls TJ-Hys below TJ-SD, operation can continue. 8.3.4.12 WPC v1.2 Compatibility The bq5105x is a WPC v1.2 compatible device. In order to enable a Power Transmitter to monitor the power loss across the interface as one of the possible methods to limit the temperature rise of Foreign Objects, the bq5105x reports its Received Power to the Power Transmitter. The Received Power equals the power that is available from the output of the Power Receiver plus any power that is lost in producing that output power. For example, the power loss includes (but is not limited to) the power loss in the Secondary Coil and series resonant capacitor, the power loss in the Shielding of the Power Receiver, the power loss in the rectifier, the power loss in any postregulation stage, and the eddy current loss in metal components or contacts within the Power Receiver. In the WPC v1.2 specification, foreign object detection (FOD) is enforced, that means the bq5105x will send received power information with known accuracy to the transmitter. WPC v1.2 defines Received Power as “the average amount of power that the Power Receiver receives through its Interface Surface, in the time window indicated in the Configuration Packet”. A Receiver will be certified as WPC v1.2 only after meeting the following requirement. The device under test (DUT) is tested on a Reference Transmitter whose transmitted power is calibrated, the receiver must send a received power such that: 0 < (TX PWR) REF – (RX PWR out) DUT < 375 mW (5) This 250 mW bias ensures that system will remain interoperable. WPC v1.2 Transmitters will be tested to see if they can detect reference Foreign Objects with a Reference receiver. The WPC v1.2 specification allows much more accurate sensing of Foreign Objects than WPC v1.0. A Transmitter can be certified as a WPC v1.2 only after meeting the following requirement. A Transmitter is tested to see if it can prevent some reference Foreign Objects (disc, coin, foil) from exceeding their threshold temperature (60°C, 80°C). 8.4 Device Functional Modes The general modes of battery charging are described above in the Feature Description. The bq5105x devices have several functional modes. Start-up refers to the initial power transfer and communication between the receiver (bq5105x circuit) and the transmitter. Power transfer refers to any time that the TX and RX are communicating and power is being delivered from the TX to the RX. Charge termination covers intentional termination (charge complete) and unintentional termination (removal of the RX from the TX, over temperature or other fault conditions). Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 27 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information The bq51050B is an integrated wireless power receiver and charger in a single device. The device complies with the WPC v1.2 specifications for a wireless power receiver. When paired with a WPC v1.2 compliant transmitter, it can provide up to 5-W of power for battery charging. There are several tools available for the design of the system. These tools may be obtained by checking the product page at www.ti.com/product/bq51050b. 9.2 Typical Application 9.2.1 bq51050B Used as a Wireless Power Receiver and Li-Ion/Li-Pol Battery Charger The following application discussion covers the requirements for setting up the bq51050B in a Qi-compliant system for charging a battery. bq5105xB AD-EN AD BAT CCOMM1 C4 COMM1 CBOOT1 D1 BOOT1 RECT C1 AC1 TI Wireless Power Transmitter R4 C3 TX COIL RX COIL C2 PACK+ NTC TS/CTRL AC2 BOOT2 CBOOT2 ROS COMM2 CHG CCOMM2 CCLAMP2 CCLAMP1 PACK- CLAMP2 TERM Tri-State CLAMP1 EN2 Bi-State ILIM R1 FOD PGND HOST R5 RFOD Copyright © 2016, Texas Instruments Incorporated Figure 32. Typical Application Schematic 9.2.1.1 Design Requirements This application is for a 4.2-V Lithium-Ion battery to be charged at 800 mA. Because this is planned for a WPC v1.2 solution, any of the Qi-certified transmitters can be used interchangeably so no discussion of the TX is required. To charge a 4.20-V Li-Ion battery, the bq51050B will be chosen. Each of the components from the application drawing will be examined. Temperature sensing of the battery must be done with JEITA specifications. An LED indicator is required to notify the user if charging is active. 28 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 Typical Application (continued) 9.2.1.2 Detailed Design Procedure 9.2.1.2.1 Series and Parallel Resonant Capacitor Selection Shown in Figure 33, the capacitors C1 (series) and C2 (parallel) make up the dual resonant circuit with the receiver coil. These two capacitors must be sized correctly per the WPC v1.2 specification. Figure 33 shows the equivalent circuit of the dual resonant circuit: C1 (Cs) C2 (Cd) >•[ Figure 33. Dual Resonant Circuit with the Receiver Coil The power receiver design requirements in volume 1 of the WPC v1.2 specification highlights in detail the sizing requirements. To summarize, the receiver designer will be required take inductance measurements with a fixed test fixture. The test fixture is shown in Figure 34: Magnetic Attractor (example) Interface Surface Secondary Coil Shielding (optional) Mobile Device Spacer dz Primary Shielding Figure 34. WPC v1.2 Receiver Coil Test Fixture for the Inductance Measurement Ls’ The primary shield is to be 50 mm × 50 mm × 1 mm of Ferrite material PC44 from TDK Corp. The gap (dZ) is to be 3.4 mm. The receiver coil, as it will be placed in the final system (for example, the back cover and battery must be included if the system calls for this), is to be placed on top of this surface and the inductance is to be measured at 1-V RMS and a frequency of 100 kHz. This measurement is termed Ls’. The measurement termed Ls is the free-space inductance. Each capacitor can then be calculated using Equation 6: 1 C1 = (2p ´ ¦ s)2 ´ L 's æ 1 ö C2 = ç ( ¦D ´ 2p)2 ´ L s ÷ C1 ø è -1 (6) Where fS is 100 kHz +5/–10% and fD is 1 MHz ±10%. C1 must be chosen first prior to calculating C2. The quality factor must be greater than 77 and can be determined by Equation 7: Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 29 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com Typical Application (continued) Q= 2p ´ ¦D ´ Ls R (7) Where R is the DC resistance of the receiver coil. All other constants are defined above. For this application, we will design with an inductance measurement (L) of 11 µH and an Ls' of 16 µH with a DC resistance of 191 mΩ. Plugging Ls' into Equation 6 above, we get a value for C1 to be 158.3 nF. The range on the capacitance is about 144 nF to 175 nF. To build the resulting value, the optimum solution is usually found with 3 capacitors in parallel. This allows for more precise selection of values, lower effective resistance and better thermal results. To get 158 nF, choose from standard values. In this case, the values are 68 nF, 47 nF and 39 nF for a total of 154 nF. Well in the required range. Now that C1 is chosen, the value of C2 can be calculated. The result of this calculation is 2.3 nF. The practical solution for this is 2 capacitors, a 2.2 nF capacitor and a 100 pF capacitor. In all cases, these capacitors must have at least a 25-V rating. Solving for the quality factor (Q) this solution shows a rating over 500. 9.2.1.2.2 COMM, CLAMP and BOOT Capacitors For most applications, the COMM, CLAMP and BOOT capacitors will be chosen to match the Evaluation Module. The BOOT capacitors are used to allow the internal rectifier FETs to turn on and off properly. These capacitors are on the AC1 or AC2 lines to the Boot nodes and should have a minimum of 10-V rating. A 10-nF capacitor with a 10-V rating is chosen. The CLAMP capacitors are used to aid the clamping process to protect against overvoltage. Choosing a 0.47-µF capacitor with a 25-V rating is appropriate for most applications. The COMM capacitors are used to facilitate the communication from the RX to the TX. This selection can vary a bit more than the BOOT and CLAMP capacitors. In general, a 22-nF capacitor is recommended. Based on the results of testing of the communication robustness, a change to a 47-nF capacitor may be in order. The larger the capacitor the larger the deviation will be on the coil which sends a stronger signal to the TX. This also decreases the efficiency somewhat. In this case, choose the 22-nF capacitor with the 25-V rating. 9.2.1.2.3 Charging and Termination Current The Design Requirements show an 800-mA charging current and an 80-mA termination current. Setting the charge current (IBULK) is done by selecting the R1 and RFOD. Solving Equation 1 results in RILIM of 393 Ω. Setting RFOD to 200 Ω as a starting point before the FOD calibration is recommended. This leaves 205 Ω for R1. Using standard resistor values (or resistors in series / parallel) can improve accuracy. Setting the termination current is done with Equation 2. Because 80 mA is 10% of the IBULK (800mA), the RTERM is calculated as (240 * 10) or 2.4 kΩ. 9.2.1.2.4 Adapter Enable The AD pin will be tied to the external USB power source to allow for an external source to power the system. AD_EN is tied to the gate of Q1 (CSD75205W1015). This allows the bq51050B to sense when power is applied to the AD pin. The EN2 pin controls whether the wired source will be enabled or not. EN2 is tied to the system host to allow it to control the use of the USB power. If wired power is enabled and present, the AD pin will disable the BAT output and then enable Q1 through the AD_EN pin. An external charger is required to take control of the battery charging. 9.2.1.2.5 Charge Indication and Power Capacitors The CHG pin is open-drain. D1 and R4 are selected as a 2.1-V forward bias capable of 2 mA and a 100-Ω current-limiting resistor. RECT is used to smooth the internal AC to DC conversion. Two 10-µF capacitors and a 0.1-µF capacitor are chosen. The rating is 25 V. BAT capacitors are 1.0 µF and 0.1 µF. 30 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 Typical Application (continued) 9.2.1.3 Application Curves VRECT VRECT VBAT VBAT IBAT IBAT Figure 35. Battery Insertion During Precharge Figure 36. Precharge to Fast-Charge Transition Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 31 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com Typical Application (continued) 9.2.2 Application for Wired Charging The application discussed below will cover the same requirements as the first example and will add a DC supply with a secondary charger. This solution covers using a standard DC supply or a USB port as the supply. R8 D2 bq24040 IN OUT R9 R6 C6 CSD75207W15 USB or AC Adapter Input TS VSS /CHG D3 C7 PRETERM ISET2 /PG Q1 NC R7 bq5105xB C5 AD-EN AD BAT CCOMM1 C4 COMM1 CBOOT1 D1 BOOT1 RECT C1 AC1 TI Wireless Power Transmitter ISET R4 C3 TX COIL RX COIL C2 PACK+ NTC TS/CTRL AC2 BOOT2 CBOOT2 ROS COMM2 CCOMM2 CCLAMP2 CCLAMP1 CLAMP2 TERM CLAMP1 EN2 ILIM R1 PACK- CHG FOD PGND Tri-State Bi-State HOST R5 RFOD Copyright © 2016, Texas Instruments Incorporated Figure 37. bq51050B Wireless Power Receiver and Wired Charger 9.2.2.1 Design Requirements The requirements for this solution are identical to the first application so all common components are identical. This solution adds a wired charger and a blocking back-back FET (Q1). The addition of a wired charger is simply enabled. The AD pin on the bq5105x is tied to the input of the DC supply. When the bq5105x senses a voltage greater than VAD-Pres on the AD pin, the BAT pin will be disabled (high impedance). Once the BAT pin is disabled, the AD_EN pin will transition and enable Q1. If wireless power is not present, the functionality of AD and AD_EN remains and wired charging can take place. 9.2.2.2 Detailed Design Procedure 9.2.2.2.1 Blocking Back-Back FET Q1 is recommended to eliminate the potential for both wired and wireless systems to drive current to the simultaneously. The charge current and DC voltage level will set up parmerters for the blocking FET. The requirements for this system are 1 A for the wired charger and 5 V DC. The CSD75207W15 is chosen for its low RON and small size. The wired charger in this solution is the bq24040. See the bq24040 datasheet (SLUS941) for specific component selection. 32 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B bq51050B, bq51051B, bq51052B www.ti.com SLUSB42F – JULY 2012 – REVISED JUNE 2017 10 Power Supply Recommendations The bq51050B requires a Qi-compatible transmitter as its power supply. 11 Layout 11.1 Layout Guidelines • • • • • • • Keep the trace resistance as low as possible on AC1, AC2, and BAT. Detection and resonant capacitors need to be as close to the device as possible. COMM, CLAMP, and BOOT capacitors need to be placed as close to the device as possible. Via interconnect on PGND net is critical for appropriate signal integrity and proper thermal performance. High frequency bypass capacitors need to be placed close to RECT and OUT pins. ILIM and FOD resistors are important signal paths and the loops in those paths to PGND must be minimized. For the RHL package, connect the thermal pad to ground to help dissipate heat. Signal and sensing traces are the most sensitive to noise; the sensing signal amplitudes are usually measured in mV, which is comparable to the noise amplitude. Make sure that these traces are not being interfered by the noisy and power traces. AC1, AC2, BOOT1, BOOT2, COMM1, and COMM2 are the main source of noise in the board. These traces should be shielded from other components in the board. It is usually preferred to have a ground copper area placed underneath these traces to provide additional shielding. Also, make sure they do not interfere with the signal and sensing traces. The PCB should have a ground plane (return) connected directly to the return of all components through vias (two vias per capacitor for power-stage capacitors, one via per capacitor for small-signal components). For a 1-A fast charge current application, the current rating for each net is as follows: • AC1 = AC2 = 1.2 A • OUT = 1 A • RECT = 100 mA (RMS) • COMMx = 300 mA • CLAMPx = 500 mA • All others can be rated for 10 mA or less 11.2 Layout Example CLAMP2 capacitor BOOT2 TS /C AC2 2 M M CO BAT BOOT2 capacitor L TR ILIM EN2 PGND TERM AC1-AC2 capacitors AD /CHG CLAMP2 capacitor COMM1 capacitor BAT BOOT1 capacitor BOOT1 AC1 Series capacitors AC1 COMM1 BAT capacitors Figure 38. bq5105x Layout Example Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B Submit Documentation Feedback 33 bq51050B, bq51051B, bq51052B SLUSB42F – JULY 2012 – REVISED JUNE 2017 www.ti.com 12 Device and Documentation Support 12.1 Documentation Support 12.1.1 Related Documentation For related documentation, see the following: bq2404x 1A, Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger With Auto Start, SLUS941 12.2 Related Links The table below lists quick access links. Categories include technical documents, support and community resources, tools and software, and quick access to sample or buy. Table 2. Related Links PARTS PRODUCT FOLDER SAMPLE & BUY TECHNICAL DOCUMENTS TOOLS & SOFTWARE SUPPORT & COMMUNITY bq51050B Click here Click here Click here Click here Click here bq51051B Click here Click here Click here Click here Click here bq51052B Click here Click here Click here Click here Click here 12.3 Receiving Notification of Documentation Updates To receive notification of documentation updates — go to the product folder for your device on ti.com. In the upper right-hand corner, click the Alert me button to register and receive a weekly digest of product information that has changed (if any). For change details, check the revision history of any revised document. 12.4 Community Resources The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers. Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support. 12.5 Trademarks E2E is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. 12.6 Electrostatic Discharge Caution These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 12.7 Glossary SLYZ022 — TI Glossary. This glossary lists and explains terms, acronyms, and definitions. 13 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. 34 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated Product Folder Links: bq51050B bq51051B bq51052B PACKAGE OPTION ADDENDUM www.ti.com 10-Dec-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) (6) BQ51050BRHLR ACTIVE VQFN RHL 20 3000 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 125 BQ51050B BQ51050BRHLT ACTIVE VQFN RHL 20 250 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 125 BQ51050B BQ51050BYFPR ACTIVE DSBGA YFP 28 3000 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51050B BQ51050BYFPT ACTIVE DSBGA YFP 28 250 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51050B BQ51051BRHLR ACTIVE VQFN RHL 20 3000 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 125 BQ51051B BQ51051BRHLT ACTIVE VQFN RHL 20 250 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 125 BQ51051B BQ51051BYFPR ACTIVE DSBGA YFP 28 3000 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51051B BQ51051BYFPT ACTIVE DSBGA YFP 28 250 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51051B BQ51052BYFPR ACTIVE DSBGA YFP 28 3000 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51052B BQ51052BYFPT ACTIVE DSBGA YFP 28 250 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51052B (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of