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BQ24072TRGTT

BQ24072TRGTT

  • 厂商:

    BURR-BROWN(德州仪器)

  • 封装:

    VFQFN16_EP

  • 描述:

    Charger IC Lithium-Ion 16-QFN (3x3)

  • 数据手册
  • 价格&库存
BQ24072TRGTT 数据手册
Product Folder Order Now Support & Community Tools & Software Technical Documents BQ24072T, BQ24075T, BQ24079T SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 BQ2407xT Standalone 1-Cell 1.5-A Linear Battery Charger with Power Path and Voltage-Based TS 1 Features 3 Description • • The BQ2407xT series of devices are integrated Li-ion linear chargers and system power path management devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter and support charge currents up to 1.5A. The input voltage range with input over-voltage protection supports unregulated adapters. The USB input current limit accuracy and start up sequence allow the BQ2407xT to meet USB-IF inrush current specification. Additionally, the input dynamic power management (VIN - DPM) prevents the charger from crashing incorrectly configure USB sources. 1 • • • • • • • • • • • • • Fully Compliant USB Charger Selectable 100 mA and 500 mA maximum input current 100 mA Maximum current limit ensures compliance to USB-IF standard Input based dynamic power management (VIN-DPM) for protection against poor USB sources 28 V Input lting with over-voltage protection Integrated dynamic power path management (DPPM) function simultaneously and independently powers the system and charges the battery System output tracks battery voltage (BQ24072T) Supports up to 1.5 A charge current with current monitoring output (ISET) Programmable Input Current Limit up to 1.5 A for wall adapters Battery disconnect function with SYSOFF input Reverse current, short-circuit and thermal protection Flexible voltage based NTC thermistor input Proprietary start up sequence limits inrush current Status indication – charging/done, power good Small 3 mm × 3 mm 16 Lead VQFN Package The BQ2407xT features dynamic power path management (DPPM) that powers the system while simultaneously and independently charging the battery. The DPPM circuit reduces the charge current when the input current limit causes the system output to fall to the DPPM threshold; thus, supplying the system load at all times while monitoring the charge current separately. This feature reduces the number of charge and discharge cycles on the battery, allows for proper charge termination and enables the system to run with a defective or absent battery pack. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) BQ24072T BQ24075T VQFN (16) 3.00 mm x 3.00 mm BQ24079T Smart phones PDAs MP3 players Low-power handheld devices (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Circuit 1 k: 1 k: Adaptor IN DC GND 7 9 CHG • • • • PGOOD 2 Applications SYSTEM OUT 10 13 11 1PF 4.7 PF System ON /OFF Control EN2 5 BQ24075T BQ24079T BQ24072T 8 VSS BAT 2 3 15 SYSOFF 4.7 PF TS 1 CE EN1 ILIM 4 6 12 ISET TEMP PACK+ TRM 16 14 PACK- 1.18 k: 1.13 k: 13 k: 10 k: V IN 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. BQ24072T, BQ24075T, BQ24079T SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 www.ti.com Table of Contents 1 2 3 4 5 6 7 8 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Description (continued)......................................... Device Options....................................................... Pin Configuration and Functions ......................... Specifications......................................................... 8.1 8.2 8.3 8.4 8.5 8.6 9 1 1 1 2 3 3 4 6 Absolute Maximum Ratings ..................................... 6 ESD Ratings.............................................................. 6 Recommended Operating Conditions....................... 6 Thermal Information .................................................. 7 Electrical Characteristics........................................... 7 Typical Characteristics ............................................ 10 Detailed Description ............................................ 13 9.1 9.2 9.3 9.4 Overview ................................................................. Functional Block Diagram ....................................... Feature Description................................................. Device Functional Modes........................................ 13 13 14 20 10 Applications and Implementation...................... 25 10.1 Application Information.......................................... 25 10.2 Typical Applications .............................................. 25 11 Power Supply Recommendations ..................... 31 11.1 Power On .............................................................. 31 12 Layout................................................................... 33 12.1 Layout Guidelines ................................................. 33 12.2 Layout Example .................................................... 33 12.3 Thermal Package .................................................. 34 13 Device and Documentation Support ................. 35 13.1 13.2 13.3 13.4 13.5 13.6 13.7 Device Support .................................................... Related Links ........................................................ Receiving Notification of Documentation Updates Support Resources ............................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 35 35 35 35 35 35 35 14 Mechanical, Packaging, and Orderable Information ........................................................... 35 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision B (November 2014) to Revision C Page • Changed the data sheet title ................................................................................................................................................. 1 • Moved Storage temperature From: the ESD table to the Absolute Maximum Ratings.......................................................... 6 • Changed the Handling Ratings table to ESD Ratings............................................................................................................ 6 • Changed VIN-LOW To: IN-DPM in the Electrical Characteristics Power Path section ................................................................... 7 • Changed VIN-LOW To VIN-DPM in the Functional Block Diagram ............................................................................................. 13 • Changed: "R3 must be added.." To: "R8 must be added..." in the Battery Pack Temperature Monitoring section ............. 20 • Changed R6 From: 10 kΩ To: 19.1 kΩ and R7 From: 13.2 kΩ To: 8.25 kΩ in Figure 23 .................................................. 25 • Changed text: "which for this case are R6 = 8.25 kΩ and R7 = 19.1kΩ.." To: "which for this case are R7 = 8.25 kΩ and R6 = 19.1 kΩ" ................................................................................................................................................................ 26 • Changed Equation 8 ............................................................................................................................................................ 34 Changes from Revision A (April 2010) to Revision B Page • Added Handling Rating 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 • Deleted text from the Pin Configuration and Functions section: "Pin out designations are not final. Subject to change." ................................................................................................................................................................................. 4 • Changed VO(REG) to VBAT(REG) in Min Typ Max columns on the VRCH spec. of Electrical Characteristics table under sub section BATTERY CHARGER......................................................................................................................................... 8 • Changed IOUT 5.5 V To VOUT 5.5 V in Figure 28 .................................................................................................................. 27 2 Submit Documentation Feedback Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T BQ24072T, BQ24075T, BQ24079T www.ti.com SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 Changes from Original (December 2009) to Revision A Page • Added BQ24072T device to data sheet header ..................................................................................................................... 1 • Added BQ24072T feature bullet ............................................................................................................................................. 1 • Added "BQ24072T" to graphic entity...................................................................................................................................... 1 • Added BQ24072T spec. to Ordering Info table ...................................................................................................................... 3 • Added BQ24072T Pin Diagram .............................................................................................................................................. 4 • Added BQ24072T to VO(REG) in the Electrical Characteristics Power Path section ................................................................ 7 • Added "BQ24072T" to VDPPM in the Electrical Characteristics table....................................................................................... 8 • Added "BQ24072T" to VBAT(REG) the Electrical Characteristics table...................................................................................... 8 • Added BQ24072T Termination Disable (TD) description ..................................................................................................... 17 • Added graphic entity for BQ24072T DPPM and Battery Supplement Modes ...................................................................... 23 • Added graphic entity for BQ24072T Host Controlled Charger application........................................................................... 29 • Added Termination Disable operation procedure. ................................................................................................................ 29 5 Description (continued) Additionally, the regulated system input enables instant system turn-on when plugged in even with a totally discharged battery. The power-path management architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents, enabling the use of a smaller adapter. The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if the internal temperature threshold is exceeded. The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The input current limit and charge current are programmable using external resistors. 6 Device Options PART NO. VOVP VBAT(REG) VOUT(REG) VDPPM OPTIONAL FUNCTION BQ24072TRGTR 6.6 V 4.2 V VBAT + 225 mV VOREG –100 mV TD BQ24072TRGTT 6.6 V 4.2 V VBAT + 225 mV VOREG –100 mV TD BQ24075TRGTR 6.6 V 4.2 V 5.5 V 4.3 V SYSOFF BQ24075TRGTT 6.6 V 4.2 V 5.5 V 4.3 V SYSOFF BQ24079TRGTR 6.6 V 4.1 V 5.5 V 4.3 V SYSOFF BQ24079TRGTT 6.6 V 4.1 V 5.5 V 4.3 V SYSOFF Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T Submit Documentation Feedback 3 BQ24072T, BQ24075T, BQ24079T SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 www.ti.com 7 Pin Configuration and Functions 9 CHG BAT 2 ISET TD TMR IN 15 14 13 IN OUT 1 13 10 TS TMR OUT 14 11 SYSOFF 2 ILIM 15 BAT 12 ISET 1 BQ24075T and BQ24079 RGT Package QFN 16 Pin Top View 16 TS 16 BQ24072T RGT Package QFN 16 Pin Top View 12 ILIM 11 OUT 10 OUT 9 CHG Th ermal 8 VSS No t to scale 7 4 PGOOD CE Pad 6 3 EN1 8 VSS BAT 5 7 PGOOD Th ermal EN2 6 4 EN1 CE Pad 5 3 EN2 BAT No t to scale Pin Functions PIN NUMBER NAME DESCRIPTION BQ24072T BQ24075T BQ24079T I/O 1 1 I/O External NTC Thermistor Input. Connect the TS input to the center tap of a resistor divider from VIN to GND with the NTC in parallel with the bottom resistor to monitor the NTC in the battery pack. For applications that do not utilize the TS function, set the resistor divider to be a 20% ratio. See the Battery Pack Temperature Monitoring section for details on calculating the resistor values. BAT 2, 3 2, 3 I/O Charger Power Stage Output and Battery Voltage Sense Input. Connect BAT to the positive terminal of the battery. Bypass BAT to VSS with a 4.7μF to 47μF ceramic capacitor. CE 4 4 I Charge Enable Active-Low Input. Connect CE to a high logic level to place the battery charger in standby mode. In standby mode, OUT is active and battery supplement mode is available. Connect /CE to a low logic level to enable the battery charger. CE is internally pulled down with ~285kΩ. Do not leave CE unconnected to ensure proper operation. EN2 5 5 I EN1 6 6 I Input Current Limit Configuration Inputs. Use EN1 and En2 to control the maximum input current and enable USB compliance. See for the description of the operation states. EN1 and EN2 are internally pulled down with ~285kΩ. Do not leave EN1 or EN2 unconnected to ensure proper operation. PGOOD 7 7 O Open-Drain Power Good Status Indication Output. PGOOD pulls to VSS when a valid input source is detected. PGOOD is high-impedance when the input power is not within specified limits. Connect PGOOD to the desired logic voltage rail using a 1kΩ to 100kΩ resistor, or use with an LED for visual indication. VSS 8 8 – Ground. Connect to the thermal pad and to the ground rail of the circuit. CHG 9 9 O Open-Drain Charging Status Indication Output. CHG pulls to VSS when the battery is charging. CHG is high-impedance when charging is complete or when the charger is disabled. CHG flashes to indicate a timer fault. Connect CHG to the desired logic voltage rail using a 1kΩ to 100kΩ resistor, or use with an LED for visual indication. OUT 10, 11 10, 11 O System Supply Output. OUT provides a regulated output when the input is below the OVP threshold and above the regulation voltage. When the input is out of the operation range, OUT is connected to VBAT except when SYSOFF is high. Connect OUT to the system load. Bypass OUT to VSS with a 4.7μF to 47μF ceramic capacitor. ILIM 12 12 O Adjustable Current Limit Programming Input. Connect a 1.07kΩ to 7.5kΩ resistor from ILIM to VSS to program the maximum input current (EN2=1, EN1=0). The input current includes the system load and the battery charge current. Leaving ILIM unconnected disables all charging. IN 13 13 I Input Power Connection. Connect IN to the external DC supply (AC adapter or USB port). The input operating range is 4.35V to 6.6V. The input accepts voltages up to 26V without damage, but operation is suspended. Bypass IN to VS with a 1μF to 10μF ceramic capacitor. TMR 14 14 I Timer Programming Input. TMR controls the pre-charge and fast-charge safety timers. Connect TMR to VSS to disable all safety timers. Connect a 18kΩ to 72kΩ resistor between TMR and VSS to program the timers to a desired length. Leave TMR unconnected to set the timers to the default values. TS 4 Submit Documentation Feedback Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T BQ24072T, BQ24075T, BQ24079T www.ti.com SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 Pin Functions (continued) PIN NUMBER NAME DESCRIPTION BQ24072T BQ24075T BQ24079T I/O SYSOFF – 15 I System Enable Input. Connect SYSOFF high to turn off the FET connecting the battery to the system output. When an adapter is connected, charge is also disabled. Connect SYSOFF low for normal operation. SYSOFF is internally pulled up to VBAT through a large resistor (~5MΩ). Do not leave SYSOFF unconnected to ensure proper operation. TD 15 – I Termination Disable Input. Connect TD high to disable charger termination. Connect TD to VSS to enable charger termination. TD is checked during startup only and cannot be changed during operation. See the TD section in this datasheet for a description of the behavior when termination is disabled. TD is internally pulled down to VSS with ~285 kΩ. Do not leave TD unconnected to ensure proper operation. ISET 16 16 I/O Fast Charge Current Programming Input. Connect a 590 Ω to 3 kΩ resistor from ISET to VSS to program the fast charge current level. Charging is disabled if ISET is left unconnected. While charging, the voltage ISET reflects the actual charging current and can be used to monitor charge current. See the Charge Current Translator section of this datasheet for more details. Thermal Pad – -- – There is an internal electrical connection between the exposed thermal pad and the VSS pin of the device. The thermal pad must be connected to the same potential as the VSS pin on the printed circuit board. Do not use the thermal pad as the primary ground input for the device. VSS must be connected to ground at all times. Table 1. EN1/EN2 Settings EN2 EN1 MAXIMUM INPUT CURRENT INTO IN 0 0 100 mA. USB100 mode 0 1 500 mA. USB500 mode 1 0 Set by external resistor from ILIM to VSS 1 1 Standby (USB suspend mode) Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T Submit Documentation Feedback 5 BQ24072T, BQ24075T, BQ24079T SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 www.ti.com 8 Specifications 8.1 Absolute Maximum Ratings (1) (2) over operating free-air temperature range (unless otherwise noted) Input voltage Input current MIN MAX UNIT IN (with respect to VSS) –0.3 28 V BAT (with respect to VSS) –0.3 5 V OUT, EN1, EN2, CE, TS, ISET, PGOOD, CHG, ILIM, VREF, ITERM, SYSOFF, TD (with respect to VSS) –0.3 7 V IN Output current (Continuous) Output sink current 1.6 A OUT 5 A BAT (Discharge mode) 5 A BAT (Charging mode) 1.5 A CHG, PGOOD 15 mA 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. The IC operational charging life is reduced to 20,000 hours, when charging at 1.5A and 125°C. The thermal regulation feature reduces charge current if the IC’s junction temperature reaches 125°C; thus without a good thermal design the maximum programmed charge current may not be reached. 8.2 ESD Ratings V(ESD) (1) (2) Electrostatic discharge VALUE UNIT Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins (1) ±2000 V Charged device model (CDM), per JEDEC specification JESD22-C101, all pins (2) ±500 V 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. 8.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) VIN MIN MAX IN voltage range 4.35 26 UNITS V IN operating voltage range 4.35 6.4 V IIN Input current, IN pin 1.5 A IOUT Current, OUT pin 4.5 A IBAT Current, BAT pin (Discharging) 4.5 A (1) A 125 °C ICHG Current, BAT pin (Charging) TJ Junction Temperature RILIM Maximum input current programming resistor 1.07 7.5 kΩ RISET Fast-charge current programming resistor (2) 590 3000 Ω RITERM Termination current programming resistor 0 15 kΩ RTMR Timer programming resistor 18 72 kΩ (1) (2) 6 1.5 0 The IC operational charging life is reduced to 20,000 hours, when charging at 1.5A and 125°C. The thermal regulation feature reduces charge current if the IC’s junction temperature reaches 125°C; thus without a good thermal design the maximum programmed charge current may not be reached. Use a 1% tolerance resistor RISET to avoid issues with the RISET short test when using the maximum charge current setting. Submit Documentation Feedback Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T BQ24072T, BQ24075T, BQ24079T www.ti.com SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 8.4 Thermal Information RGT [VQFN] THERMAL METRIC (1) 16 PINS UNIT RθJA Junction-to-ambient thermal resistance 45.8 °C/W RθJC(top) Junction-to-case (top) thermal resistance 53.6 °C/W RθJB Junction-to-board thermal resistance 18.1 °C/W ψJT Junction-to-top characterization parameter 1.1 °C/W ψJB Junction-to-board characterization parameter 18.0 °C/W RθJC(bot) Junction-to-case (bottom) thermal resistance 5.2 °C/W (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. 8.5 Electrical Characteristics Over junction temperature range (0°C < TJ < 125°C) and the recommended supply voltage range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP 3.3 MAX UNIT INPUT VUVLO Under-voltage lock-out VIN: 0V → 4V 3.2 VHYS-UVLO Hysteresis on UVLO VIN: 4V → 0V 200 VIN-DT Input power detection threshold (Input power detected if VIN > VBAT + VIN-DT) VBAT = 3.6V, VIN: 3.5V → 4V 55 VHYS-INDT Hysteresis on VIN-DT VBAT = 3.6V, VIN: 4V → 3.5V 20 tDGL(PGOOD) Deglitch time, input power detected status Time measured from VIN: 0V → 5V, 1μs rise-time to PGOOD = LO VOVP Input overvoltage protection threshold VIN: 5V → 7V VHYS-OVP Hysteresis on OVP VIN: 7V → 5V tBLK(OVP) Input over-voltage blanking time tREC(OVP) 80 V mV 140 mV mV 1.2 6.4 6.6 ms 6.8 V 240 mV 50 μs 1.2 ms 1.3 mA 520 mV Time measured from VIN: 11V → 5V 1μs fall-time to PGOOD = LO Input over-voltage recovery time 3.4 300 ILIM, ISET SHORT CIRCUIT TEST ISC Current source VSC QUIESCENT CURRENT IBAT(PDWN) Sleep current into BAT pin IIN(STDBY) Standby current into IN pin ICC Active supply current, IN pin CE = LO or HI, input power not detected, no load on OUT pin 6.5 μA EN1= HI, EN2=HI, VIN ≤ 6V 50 EN1= HI, EN2=HI, VIN > 6V 200 CE = LO, VIN = 6V, no load on OUT pin, VBAT > VBAT(REG), (EN1,EN2)≠(HI,HI) 1.5 mA 300 475 mV 50 100 mV μA POWER PATH VDO(IN-OUT) VDO(BATOUT) VO(REG) VIN – VOUT VIN = 4.3V, IIN = 1A, VBAT = 4.2V VBAT – VOUT IOUT = 1A, VIN = 0V, VBAT > 3V OUT pin voltage regulation (BQ24072T) OUT pin voltage regulation (BQ24075T, BQ24079T) IIN-MAX Maximum input current VIN > VOUT + VDO(IN-OUT) , VBAT< 3.2 V 3.3 3.4 3.5 VIN > VOUT + VDO(IN-OUT) , VBAT ≥ 3.2 V VBAT + 150 mV VBAT + 225 mV VBAT + 270 mV VIN > VOUT + VDO(IN-OUT) 5.4 5.5 5.6 EN1 = LO, EN2 = LO 90 95 100 mA EN1 = HI, EN2 = LO 450 475 500 mA EN2 = HI, EN1 = LO KILIM/RIL A IM ILIM ≥ 500mA 1500 1600 1700 200mA < ILIM < 500mA 1330 1512 1700 KILIM Maximum input current factor IIN-MAX Programmable input current limit range EN2 = HI, EN1 = LO, RILIM = 8kΩ to 1.1kΩ 200 VIN-DPM Input voltage threshold when input current is reduced EN2 = LO, EN1 = X 4.35 Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T 4.5 V AΩ 1500 mA 4.63 V Submit Documentation Feedback 7 BQ24072T, BQ24075T, BQ24079T SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 www.ti.com Electrical Characteristics (continued) Over junction temperature range (0°C < TJ < 125°C) and the recommended supply voltage range (unless otherwise noted) PARAMETER TEST CONDITIONS BQ24072T Output voltage threshold when charging current is reduced VDPPM MIN TYP MAX VO(REG) –180 mV VO(REG) –100 mV VO(REG) –30 mV 4.2 4.3 4.4 BQ24075T, BQ24079T UNIT V VBSUP1 Enter battery supplement mode VOUT falling, Supplement mode entered when VOUT < VBSUP1 VBAT – 40mV V VBSUP2 Exit battery supplement mode VOUT rising, Supplement mode exited when VOUT > VBSUP2 VBAT – 20mV V VO(SC1) Output short-circuit detection threshold, power-on 0.8 0.9 1.0 V VO(SC2) Output short-circuit detection threshold, supplement mode VBAT – VOUT > VO(SC2) indicates short-circuit 200 250 300 mV tDGL(SC2) Deglitch time, supplement mode short circuit tREC(SC2) Recovery time, supplement mode short circuit 250 μs 60 ms BATTERY CHARGER IBAT(SC) Source current for BAT pin shortcircuit detection VBAT(SC) BAT pin short-circuit detection threshold VBAT(REG) Battery charge voltage VLOWV Pre-charge to fast-charge transition threshold tDGL1(LOWV) Deglitch time on pre-charge to fastcharge transition 25 ms tDGL2(LOWV) Deglitch time on fast-charge to precharge transition 25 ms ICHG Battery fast charge current range VBAT(REG) > VBAT > VLOWV, VIN = 5V, CE = LO, EN1= LO, EN2 = HI ICHG Battery fast charge current CE = LO, EN1= LO, EN2 = HI, VBAT > VLOWV, VIN = 5V, IIN-MAX > ICHG, no load on OUT pin, thermal loop not active, DPM loop not active KISET Fast charge current factor IPRECHG Pre-charge current kPRECHG Pre-charge current factor BQ24072T, BQ24075T BQ24079T tDGL(TERM) 7.5 11 mA 1.6 1.8 2.0 V 4.16 4.20 4.24 4.059 4.100 4.141 2.9 3 3.1 300 Recharge detection threshold tDGL(RCH) Deglitch time, recharge threshold detected tDGL(NO-IN) Delay time, input power loss to charger turn-off IBAT(DET) Sink current for battery detection tDET Battery detection timer 890 975 88 106 CE = LO, (EN1,EN2)≠(LO,LO), VBAT > VRCH, t < tMAXCH, VIN = 5V, DPM loop not active, thermal loop not active 0.09×ICHG 0.1×ICHG 0.11×ICHG CE = LO, (EN1,EN2)=(LO,LO), VBAT > VRCH, t < tMAXCH, VIN = 5V, DPM loop not active, thermal loop not active 0.027×ICHG 0.033×ICHG 0.040×ICHG VBAT(REG) –140mV VBAT(REG) –100mV 25 5 V mA AΩ A 70 VBAT = 3.6V. Time measured from VIN: 5V → 3.3V 1μs fall-time V A KPRECHG /RISET Deglitch time, termination detected VRCH 1500 KISET/RISET 797 Charge current value for termination detection threshold ITERM 4 ms VBAT(REG) –60mV V 62.5 ms 20 ms 7.5 10 250 mA ms BATTERY CHARGING TIMERS tPRECHG Pre-charge safety timer value TMR = floating 1440 1800 2160 s tMAXCH Charge safety timer value TMR = floating 14400 18000 21600 s tPRECHG Pre-charge safety timer value(externally set) 18kΩ < RTMR < 72kΩ 8 Submit Documentation Feedback RTMR x KTMR s Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T BQ24072T, BQ24075T, BQ24079T www.ti.com SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 Electrical Characteristics (continued) Over junction temperature range (0°C < TJ < 125°C) and the recommended supply voltage range (unless otherwise noted) PARAMETER TEST CONDITIONS tMAXCH Charge safety timer value (externally set) KTMR Timer factor 18kΩ < RTMR < 72kΩ MIN TYP MAX 10 x RTMR x KTMR UNIT s 35 45 55 s / kΩ 12 12.5 13 % of VIN BATTERY – PACK NTC MONITOR VHOT High temperature trip point Battery charging VHYS(HOT) Hysteresis on high trip point Battery charging VCOLD Low temperature trip point Battery charging VHYS(COLD) Hysteresis on low trip point Battery charging 1 % of VIN tDGL(TS) Deglitch time, pack temperature fault detection Battery charging 50 ms % of VIN 1 24.5 25 25.5 % of VIN THERMAL REGULATION TJ(REG) Temperature Regulation Limit 125 °C TJ(OFF) Thermal shutdown temperature 155 °C TJ(OFF-HYS) Thermal shutdown hysteresis 20 °C LOGIC LEVELS ON EN1, EN2, CE, SYSOFF, TD VIL Logic LOW input voltage 0 0.4 VIH Logic HIGH input voltage 1.4 6.0 V V IIL 1 μA IIH 10 μA 0.4 V LOGIC LEVELS ON PGOOD, CHG VOL Output LOW voltage ISINK = 5 mA Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T Submit Documentation Feedback 9 BQ24072T, BQ24075T, BQ24079T SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 www.ti.com 8.6 Typical Characteristics VIN = 6 V, EN1 = 1, EN2 = 0, TA = 25°C, unless otherwise noted. 600 0.7 500 0.6 Dropout Voltage - VIN-VOUT IBAT - mA IL = 1 A 400 300 200 100 0 0.5 0.4 0.3 0.2 0.1 120 125 130 135 Temperature - oC 140 0 145 Figure 1. Thermal Regulation 0 25 100 50 75 TJ - Junction Temperature - °C 125 Figure 2. Dropout Voltage vs Temperature 4.6 120 VIN = 5 V IL = 1 A 4.4 80 VO - Output Voltage - V Dropout Voltage - VBAT-VOUT 100 VBAT = 3 V 60 VBAT = 3.9 V 40 20 3.8 3.6 3.4 3 0 50 75 100 25 TJ - Junction Temperature - °C 2 125 Figure 3. Dropout Voltage vs Temperature 2.5 3 3.5 4 VBAT - Battery Voltage - V 4.5 Figure 4. BQ24072T Output Regulation Voltage vs Battery Voltage 5.75 3.80 VIN = 5 V, VBAT = 3.5 V, IL = 1 A 3.76 5.65 3.74 3.72 3.70 3.68 3.66 5.60 5.55 5.50 5.45 5.40 3.64 5.35 3.62 5.30 3.60 0 25 VIN = 6 V, IL = 1 A 5.70 VO - Output Voltage - V 3.78 VO - Output Voltage - V 4 3.2 0 50 75 100 125 TJ - Junction Temperature - °C Figure 5. BQ24072T Output Regulation Voltage vs Temperature 10 4.2 Submit Documentation Feedback 5.25 0 25 50 75 100 TJ - Junction Temperature - °C 125 Figure 6. Output Regulation Voltage vs Temperature Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T BQ24072T, BQ24075T, BQ24079T www.ti.com SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 Typical Characteristics (continued) 4.210 4.11 4.205 4.105 VBAT - Regulation Voltage - V VBAT - Regulation Voltage - V VIN = 6 V, EN1 = 1, EN2 = 0, TA = 25°C, unless otherwise noted. 4.200 4.195 4.190 4.185 4.180 0 4.1 4.095 4.09 4.085 4.08 5 10 15 20 25 0 30 TJ - Junction Temperature - °C Figure 7. BQ24075T BAT Regulation Voltage vs Temperature 800 RILIM 6.6 V 700 6.65 ILIM - Input Current - mA VOVP - Output Voltage Threshold - V 30 Figure 8. BQ24079T Battery Regulation Voltage vs Temperature 6.70 VI Rising 6.60 6.55 VI Falling 6.50 600 500 USB500 400 300 200 USB100 100 6.45 0 0 25 50 75 100 TJ - Junction Temperature - °C 5 125 Figure 9. Overvoltage ProtectionThreshold vs Temperature 6 7 8 9 VI - Input Voltage - V 10 Figure 10. Input Current Limit vs Input Voltage 310 1.05 RISET = 900 W RISET = 3 kW IBAT - Fast Charge Current - A IBAT - Fast Charge Current - A 5 10 15 20 25 TJ - Junction Temperature - °C 1.03 1.01 0.99 0.97 0.95 305 300 295 290 285 280 3 3.2 3.6 3.8 4 3.4 VBAT - Battery Voltage - V 4.2 Figure 11. Fastcharge Current vs Battery Voltage 3 3.2 3.4 3.6 3.8 4 VBAT - Battery Voltage - V 4.2 Figure 12. Fastcharge Current vs Battery Voltage Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T Submit Documentation Feedback 11 BQ24072T, BQ24075T, BQ24079T SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 www.ti.com Typical Characteristics (continued) VIN = 6 V, EN1 = 1, EN2 = 0, TA = 25°C, unless otherwise noted. 31.5 105 RISET = 900 W RISET = 3 kW 31 103 IBAT - Precharge Current - A IBAT - Precharge Current - A 104 102 101 100 99 98 97 30.5 30 29.5 29 96 28.5 95 2 12 2.2 2.4 2.6 2.8 3 VBAT - Battery Voltage - V 2.2 2.4 2.6 2.8 VBAT - Battery Voltage - V Figure 13. Fastcharge Current vs Battery Voltage Figure 14. Precharge Current vs Battery Voltage Submit Documentation Feedback 2 3 Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T BQ24072T, BQ24075T, BQ24079T www.ti.com SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 9 Detailed Description 9.1 Overview The BQ2407x devices are integrated Li-Ion linear chargers and system power path management devices targeted at space-limited portable applications. The device powers the system while simultaneously and independently charging the battery. This feature reduces the number of charge and discharge cycles on the battery, allows for proper charge termination and enables the system to run with a defective or absent battery pack. It also allows instant system turn-on even with a totally discharged battery. The input power source for charging the battery and running the system can be an AC adapter or a USB port. The devices feature Dynamic Power Path Management (DPPM), which shares the source current between the system and battery charging, and automatically reduces the charging current if the system load increases. When charging from a USB port, the input dynamic power management (VIN-DPM) circuit reduces the input current if the input voltage falls below a threshold, preventing the USB port from crashing. The power-path architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents. 9.2 Functional Block Diagram 250mV VO(SC1) V BAT OUT-SC1 t DGL(SC2) OUT- SC2 Q1 IN OUT EN2 Short Detect 225mV Precharge VIN-DPM USB100 USB5 00 ISET 2.25V Fastcharge TJ ILIM VREF- ILIM USB-susp TJ(REG) Short Detect V DPPM V O(REG) Q2 VOUT EN2 EN1 V BAT (REG) BAT VBAT V OUT CHARGEPUMP SYSOFF 40mV Supplement V LOWV 225mV) V BAT(SC) tDGL(RCH) tDGL2(LOWV) VIN tDGL1(LOWV) tDGL(TE RM) V RCH VIN BAT-SC V BAT + VIN-DT tDGL(NO-IN) tDGL(PGOOD) V UVLO VCOLD TS t DGL(TS) Charge Control V HOT V OVP tBLK(OVP) EN1 EN2 USB Suspend CE Halt timers CHG V IPRECHG VICHG V ISET Reset timers PGOOD Dynamically Controlled Oscillator TMR Fast- Charge Timer Timer fault Pre- Charge Timer Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T Submit Documentation Feedback 13 BQ24072T, BQ24075T, BQ24079T SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 www.ti.com 9.3 Feature Description 9.3.1 Undervoltage Lockout (UVLO) The BQ2407X family remains in power down mode when the input voltage at the IN pin is below the undervoltage threshold (UVLO). During the power down mode the host commands at the control inputs (CE, EN1 and EN2) are ignored. The Q1 FET connected between IN and OUT pins is off, and the status outputs, CHG and PGOOD, are high impedance. The Q2 FET that connects BAT to OUT is ON. (If SYSOFF is high, Q2 is off). During power down mode, the VOUT(SC2) circuitry is active and monitors for overload conditions on OUT. 9.3.2 Overvoltage Protection (OVP) The BQ2407xT accepts inputs up to 28V without damage. Additionally, an overvoltage protection (OVP) circuit is implemented that shuts off the internal LDO and discontinues charging when VIN > VOVP for a period longer than tDGL(OVP). When in OVP, the system output (OUT) is connected to the battery and PGOOD is high impedance. Once the OVP condition is removed, a new power on sequence starts (See the POWER ON section). The safety timers are reset and a new charge cycle will be indicated by the CHG output. 9.3.3 Dynamic Power-Path Management The BQ2407xT features an OUT output that powers the external load connected to the battery. This output is active whenever a source is connected to IN or BAT. The following sections discuss the behavior of OUT with a source connected to IN to charge the battery and a battery source only. 9.3.4 Battery Charging Set CE low to initiate battery charging. First, the device checks for a short-circuit on the BAT pin by sourcing IBAT(SC) to the battery and monitoring the voltage. When the BAT voltage exceeds VBAT(SC), the battery charging continues. The battery is charged in three phases: conditioning pre-charge, constant current fast charge (current regulation) and a constant voltage tapering (voltage regulation). In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded. Figure 15. Typical Charging Cycle 14 Submit Documentation Feedback Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T BQ24072T, BQ24075T, BQ24079T www.ti.com SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 Feature Description (continued) Figure 15 illustrates a normal Li-Ion charge cycle using the BQ2407xT. In the pre-charge phase, the battery is charged at with the pre-charge current (IPRECHG). Once the battery voltage crosses the VLOWV threshold, the battery is charged with the fast-charge current (ICHG). As the battery voltage reaches VBAT(REG), the battery is held at a constant voltage of VBAT(REG) and the charge current tapers off as the battery approaches full charge. When the battery current reaches ITERM, the CHG pin indicates charging done by going high-impedance. Note that termination detection is disabled whenever the charge rate is reduced because of the actions of the thermal loop, the DPPM loop or the VIN-DPM loop. The value of the fast-charge current is set by the resistor connected from the ISET pin to VSS, and is given by Equation 1. ICHG = KISET / RISET (1) The charge current limit is adjustable up to 1.5A. The valid resistor range is 590Ω to 3 kΩ. Note that if ICHG is programmed as greater than the input current limit, the battery will not charge at the rate of ICHG, but at the slower rate of IIN(MAX) (minus the load current on the OUT pin, if any). In this case, the charger timers will be proportionately slowed down. 9.3.5 Charge Current Translator When the charger is enabled, internal circuits generate a current proportional to the charge current at the ISET input. The current out of ISET is 1/400 (±10%) of the charge current. This current, when applied to the external charge current programming resistor, RISET, generates an analog voltage that can be monitored by an external host to calculate the current sourced from BAT. VISET = ICHARGE / 400 × RISET (2) Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T Submit Documentation Feedback 15 BQ24072T, BQ24075T, BQ24079T SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 www.ti.com Feature Description (continued) Begin Charging Battery short detected ? Yes No Start Precharge /CHG= Low No No V BAT > VLOWV tPRECHARGE Elapsed? Yes End Charge Flash/CHG Start Fastcharge ICHARGE set by ISET No No IBAT < ITERM tFASTCHARGE Elapsed? Yes End Charge Flash/CHG Charge Done /CHG= Hi-Z TD= Low (’72, ’73 Only) (’74, ’75= YES) No Yes Termination Reached BATTFET Off Wait for VBAT < V RCH No VBAT < V RCH Yes Run Battery Detection No Battery Detected ? Yes Figure 16. Battery Charging Flow Diagram 16 Submit Documentation Feedback Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T BQ24072T, BQ24075T, BQ24079T www.ti.com SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 Feature Description (continued) 9.3.6 Battery Detection and Recharge The BQ2407xT automatically detects if a battery is connected or removed. Once a charge cycle is complete, the battery voltage is monitored. When the battery voltage falls below VRCH, the battery detection routine is run. During battery detection, current (IBAT(DET)) is pulled from the battery for a duration tDET to see if the voltage on BAT falls below VLOWV. If not, charging begins. If it does, then it indicates that the battery is missing or the protector is open. Next, the precharge current is applied for tDET to close the protector if possible. If VBAT < VRCH, then the protector is closed and charging is initiated. If VBAT > VRCH, then the battery is determined to be missing and the detection routine continues. 9.3.7 Termination Disable (TD Input, BQ24072T) The BQ24072T contains a TD input that allows termination to be enabled/ disabled. Connect TD to a logic high to disable charge termination. When termination is disabled, the device goes through the pre-charge, fast-charge and CV phases, then remains in the CV phase. During the CV phase, the charger maintains the output voltage at BAT equal to VBAT(REG), and charging current does not terminate. The charge current is set by ICHG or IINmax, whichever is less. Battery detection is not performed. The CHG output is high impedance once the current falls below ITERM and does not go low until the input power or CE are toggled. When termination is disabled, the precharge and fast-charge safety timers are also disabled. 9.3.8 Battery Disconnect (SYSOFF Input) The BQ24075T and BQ24079T feature a SYSOFF input that allows the user to turn the FET Q2 off and disconnect the battery from the OUT pin. This is useful for disconnecting the system load from the battery, factory programming where the battery is not installed or for host side impedance track fuel gauging, such as BQ27500, where the battery open circuit voltage level must be detected before the battery charges or discharges. The CHG output remains low when SYSOFF is high. Connect SYSOFF to VSS, to turn Q2 on for normal operation. SYSOFF is internally pulled to VBAT through ~5 MΩ resistor. 9.3.9 Dynamic Charge Timers (TMR Input) The BQ2407xT devices contain internal safety timers for the pre-charge and fast-charge phases to prevent potential damage to the battery and the system. The timers begin at the start of the respective charge cycles. The timer values are programmed by connecting a resistor from TMR to VSS. The resistor value is calculated using the following equation: tPRECHG = KTMR × RTMR tMAXCHG = 10 × KTMR × RTMR Leave TMR unconnected to select the internal default timers. Disable the timers by connecting TMR to VSS. Note that timers are suspended when the device is in thermal shutdown, and the timers are slowed proportionally to the charge current when the device enters thermal regulation. 1. During the fast charge phase, several events increase the timer durations. 2. The system load current activates the DPPM loop which reduces the available charging current 3. The input current is reduced because the input voltage has fallen to VIN-DPM 4. The device has entered thermal regulation because the IC junction temperature has exceeded TJ(REG) During each of these events, the internal timers are slowed down proportionately to the reduction in charging current. For example, if the charging current is reduced by half for two minutes, the timer clock is reduced to half the frequency and the counter counts half as fast resulting in only one minute of "counting" time. If the precharge timer expires before the battery voltage reaches VLOWV, the BQ2407xT indicates a fault condition. Additionally, if the battery current does not fall to ITERM before the fast charge timer expires, a fault is indicated. The CHG output flashes at approximately 2 Hz to indicate a fault condition. The fault condition is cleared by toggling CE or the input power, entering/ exiting USB suspend mode, or an OVP event. Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T Submit Documentation Feedback 17 BQ24072T, BQ24075T, BQ24079T SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 www.ti.com Feature Description (continued) 9.3.10 Status Indicators (PGOOD, CHG) The BQ2407xT contains two open-drain outputs that signal its status. The PGOOD output signals when a valid input source is connected. PGOOD is low when (VBAT + VIN(DT)) < VIN < VOVP. When the input voltage is outside of this range, PGOOD is high impedance. The charge cycle after power-up, CE going low, or exiting OVP is indicated with the CHG output on (low - LED on), whereas all refresh (subsequent) charges will result in the CHG output off (open – LED off). In addition, the CHG signals timer faults by flashing at approximately 2 Hz. Table 2. PGOOD Status Indicator INPUT STATE PGOOD OUTPUT VIN < VUVLO Hi impedance VUVLO < VIN < VIN(DT) Hi impedance VIN(DT) < VIN < VOVF Low VIN < VOVP Hi impedance Table 3. CHG Status Indicator CHARGE STATE Charging Charging suspended by thermal loop, or DPPM loop Safety timers expired CHG OUTPUT Low (for first charge cycle) Flashing at 2 Hz Charging done Recharging after termination IC disabled or no valid input power Hi impedance Battery absent 9.3.11 Thermal Regulation and Thermal Shutdown The BQ2407xT contain a thermal regulation loop that monitors the die temperature. If the temperature exceeds TJ(REG), the device automatically reduces the charging current to prevent the die temperature from increasing further. In some cases, the die temperature continues to rise despite the operation of the thermal loop, particularly under high VIN and heavy OUT system load conditions. Under these conditions, if the die temperature increases to TJ(OFF), the input FET Q1 is turned OFF. FET Q2 is turned ON to ensure that the battery still powers the load on OUT. Once the device die temperature cools by TJ(OFF-HYS), the input FET Q1 is turned on and the device returns to thermal regulation. Continuous overtemperature conditions result in a "hiccup" mode. During thermal regulation, the safety timers are slowed down proportionately to the reduction in current limit. Note that this feature monitors the die temperature of the BQ2407xT. This is not synonymous with ambient temperature. Self heating exists due to the power dissipated in the IC because of the linear nature of the battery charging algorithm and the LDO associated with OUT. A modified charge cycle with the thermal loop active is shown in Figure 17. Battery termination is disabled during thermal regulation. 18 Submit Documentation Feedback Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T BQ24072T, BQ24075T, BQ24079T www.ti.com SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 PRECHARGE THERMAL REGULATION CC FAST CHARGE CV TAPER DONE VO(REG) IO(CHG) Battery Voltage Battery Current V(LOWV) HI-z I(PRECHG) I(TERM) TJ(REG) IC Junction Temperature, TJ Figure 17. Charge Cycle Modified by Thermal Loop 9.3.12 Battery Pack Temperature Monitoring The BQ2407xT features an external battery pack temperature monitoring input. The TS input connects to the NTC thermistor in the battery pack to monitor battery temperature and prevent dangerous over-temperature conditions. During charging, the voltage at TS is continuously monitored. If, at any time, the voltage at TS is outside of the operating range (VCOLD to VHOT), charging is suspended. The timers maintain their values but suspend counting. When the voltage measured at TS returns to within the operation window, charging is resumed and the timers continue counting. When charging is suspended due to a battery pack temperature fault, the CHG output remains low and continues to indicate charging. VIN R6 = -1 VCOLD 1 1 + R 7 RCOLD (3) é 1 1 ù VIN ´ RCOLD ´ RHOT ´ ê ú VCOLD VHOT û ë R7 = é V ù é V ù RHOT ´ ê IN - 1ú - RCOLD ´ ê IN - 1ú ëVHOT û ëVCOLD û Copyright © 2009–2019, Texas Instruments Incorporated Product Folder Links: BQ24072T BQ24075T BQ24079T (4) Submit Documentation Feedback 19 BQ24072T, BQ24075T, BQ24079T SLUS937C – DECEMBER 2009 – REVISED DECEMBER 2019 www.ti.com Where: VCOLD = 0.25 X VIN VHOT = 0.125 X VIN RHOT is the expected thermistor resistance at the programmed hot threshold, RCOLD is the expected thermistor resistance at the programmed cold threshold. If the value of R6 is less than 100 kΩ, R8 must be added to protect the IC from 28V inputs. If R6 is greater than 100 kΩ, R8 does not need to be used. Adapter IN R6 V COLD + TS R8 PACK TEMP + Not necessary in all applications VHOT + R7 PACK - + BQ240xT Figure 18. NTC Monitoring Function For applications that do not require the TS monitoring function, set R6 = 200 kΩ and R7 = 49.9 kΩ to set the TS voltage at a valid level and maintain charging. 9.4 Device Functional Modes 9.4.1 Input Source Connected (Adapter or USB) With a source connected, the dynamic power-path management (DPPM) circuitry of the BQ2407xT monitors the input current continuously. The OUT output for the BQ24075T and BQ24079T is regulated to a fixed voltage (VO(REG)). For the BQ24072T, OUT is regulated to 225 mV above the voltage at BAT. If the BAT voltage is less than 3.2 V, OUT is clamped to 3.4 V. This allows for proper startup of the system load even with a discharged battery. The current into IN is shared between charging the battery and powering the system load at OUT. The BQ2407xT has internal selectable current limits of 100 mA (USB100) and 500 mA (USB500) for charging from USB ports, as well as a resistor-programmable input current limit. The BQ2407xT is USB IF compliant for the inrush current testing. The USB spec allows up to 10 μF to be hard started, which establishes 50μC as the maximum inrush charge value when exceeding 100 mA. The input current limit for the BQ2407xT prevents the input current from exceeding this limit, even with system capacitances greater than 10 μF. Note that the input capacitance to the device must be selected small enough to prevent a violation (
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