LTC4101EG

LTC4101 Smart Battery Charger Controller FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Single Chip Smart Battery Charger Controller 100% Compliant (Rev. 1.1) SMBus Support Allows for Operation with or without Host Up to 4A Charging Current Capability High Efficiency Synchronous Buck Charger VBAT Optimized 3V to 5.5V SMBus Accelerator Improves SMBus Timing Hardware Interrupt and SMBAlert Response Eliminate Interrupt Polling 0.5V Dropout Voltage; Maximum Duty Cycle > 98% AC Adapter Current Limit Maximizes Charge Rate ±0.8% Voltage Accuracy; ±4% Current Accuracy 10-Bit DAC for Charge Current Programming 11-Bit DAC for Charger Voltage Programming User-Selectable Overvoltage and Overcurrent Limits High Noise Immunity SafetySignal Sensor Available in a 24-Pin SSOP Package The LTC®4101 Smart Battery Charger is a single chip charging solution that dramatically simplifies construction of an SBS compliant system. The LTC4101 implements a Level 2 charger function whereby the charger can be programmed by the battery or by the host. A SafetySignal on the battery being charged is monitored for temperature, connectivity and battery type information. The SMBus interface remains alive when the AC power adapter is removed and responds to all SMBus activity directed to it, including SafetySignal status (via the ChargerStatus command). The charger also provides an interrupt to the host whenever a status change is detected (e.g., battery removal, AC adapter connection). Charging current and voltage are restricted to chemistryspecific limits for improved system safety and reliability. Limits are programmable by two external resistors. Additionally, the maximum average current from the AC adapter is programmable to avoid overloading the adapter when simultaneously supplying load current and charging current. When supplying system load current, charging current is automatically reduced to prevent adapter overload. APPLICATIO S ■ ■ Portable Instruments and Computers Data Storage Systems and Battery Backup Servers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6650174, 5723970. TYPICAL APPLICATIO DCIN 9V to 12V, 2A 3V TO 5.5V 6.04k 1.21k 17 11 6 10 7 9 8 15 16 13 1.13k 10k 54.9k 14 20 LTC4101 VDD DCDIV CHGEN ACP SMBALERT SCL SDA THB THA ILIM VLIM IDC 0.1µF 0.1µF 5k 0.05Ω DCIN INFET CLP CLN TGATE BGATE PGND CSP BAT VSET ITH GND 5 4 24 23 1 3 2 21 22 18 19 12 6.04k 0.12µF SafetySignal CHGEN ACP 5µF 24µH 0.03µF 0.0015µF 0.068µF 0.1µF SMBALERT# SMBCLK SMBDAT Figure 1. 1A Smart Battery Charger 4101f U VBAT < 5.5V > 5.5V PART LTC4101 LTC4100 SYSTEM LOAD 0.1Ω 1% SMART BATTERY 5µF 100Ω SMBCLK SMBDAT 4101 F01a U U 1 LTC4101 ABSOLUTE (Note 1) AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW TGATE PGND BGATE INFET DCIN CHGEN SMBALERT SDA SCL 1 2 3 4 5 6 7 8 9 24 CLP 23 CLN 22 BAT 21 CSP 20 IDC 19 ITH 18 VSET 17 VDD 16 THA 15 THB 14 VLIM 13 ILIM Voltage from VDD to GND ................................ 7V/–0.3V Voltage from CHGEN, DCDIV, SDA, SCL and SMBALERT to GND .............................. 7V/–0.3V Voltage from DCIN, CLP, CLN to GND ........... 32V/–0.3V Voltage from CLP to CLN ...................................... ±0.3V PGND wrt. GND .................................................... ±0.3V CSP, BAT to GND .............................................. 28V/–5V Operating Ambient Temperature Range (Note 4) ........................................................... – 40°C to 85°C Junction Temperature Range ............... – 40°C to 125°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C ACP 10 DCDIV 11 GND 12 G PACKAGE 24-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 90°C/W ORDER PART NUMBER LTC4101EG Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges. The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDCIN = 20V, VDD = 3.3V, VBAT = 4V unless otherwise noted. (Note 4) SYMBOL IDCIN VTOL ITOL VDD Shutdown Battery Leakage Current UVLO Undervoltage Lockout Threshold VDD Power-Fail DCIN Current in Shutdown Current Sense Amplifier, CA1 Input Bias Current into BAT Pin CMSL CMSH CA1/I1 Input Common Mode Low CA1/I1 Input Common Mode High VDCIN ≤ 28V ● ● ELECTRICAL CHARACTERISTICS PARAMETER DCIN Operating Range DCIN Operating Current Charge Voltage Accuracy Charge Current Accuracy (Note 3) VDD Operating Voltage CONDITIONS ● MIN 6 TYP 3 MAX 28 5 1.1 1.3 6 7 5.5 UNITS V mA % % % % V µA V V mA µA V Charging, Sum of Currents on DCIN, CLP and CLN (Note 2) ● –1.1 –1.3 –2 –3 3 15 4.2 4.7 2 11.66 0 VCSP – VBAT Target = 102.3mV IDAC = 0xFFFF 0V ≤ VDCIN ≤ 28V DCIN = 0V, VCLP = VCLN = VCSP = VBAT DCIN Rising, VBAT = 0V Part Held in Reset Until this VDD Present VCHGEN = 0V ● ● ● ● ● 35 5.5 3 3 VCLN-0.2 2 U V 4101f W U U WW W LTC4101 The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDCIN = 20V, VDD = 3.3V, VBAT = 4V unless otherwise noted. (Note 4) SYMBOL ITREV PARAMETER Reverse Current Threshold (VCSP-VBAT) Transconductance Source Current Sink Current Current Limit Amplifier Transconductance VCLP ICLN Current Limit Threshold CLN Input Bias Current Transconductance Sink Current OVSD Overvoltage Shutdown Threshold as a Percent of Programmed Charger Voltage DCIN Detection Threshold (VDCIN-VCLP) Forward Regulation Voltage (VDCIN-VCLP) Reverse Voltage Turn-Off Voltage (VDCIN-VCLP) INFET “ON” Clamping Voltage (VDCIN-VINFET) INFET “OFF” Clamping Voltage (VDCIN-VINFET) Oscillator fOSC fMIN DCMAX Regulator Switching Frequency Regulator Switching Frequency in Drop Out Regulator Maximum Duty Cycle VTGATE High (VCLP-VTGATE) VBGATE High VTGATE Low (VCLP-VTGATE) VBGATE Low TGTR TGTF BGTR BGTF TGATE Transition Time TGATE Rise Time TGATE Fall Time BGATE Transition Time BGATE Rise Time BGATE Fall Time VTGATE at Shutdown (VCLN-VTGATE) VBGATE at Shutdown Duty Cycle ≥ 98% VCSP = VBAT ITGATE = –1mA CLOAD = 3000pF CLOAD = 3000pF IBGATE = 1mA CLOAD = 3000pF, 10% to 90% CLOAD = 3000pF, 10% to 90% CLOAD = 3000pF, 10% to 90% CLOAD = 3000pF, 10% to 90% ITGATE = –1µA ITGATE = 1µA 50 50 40 40 4.5 4.5 5.6 5.6 255 20 98 300 25 99 50 10 10 50 110 100 90 80 100 100 345 kHz kHz % mV V V mV ns ns ns ns mV mV IINFET = 1µA IINFET = – 25µA DCIN Voltage Ramping Up from VCLP-0.05V Measured at ITH, VITH = 1.4V ● ● ELECTRICAL CHARACTERISTICS Current Comparators IREV CONDITIONS MIN TYP – 30 1 MAX UNITS mV mmho µA µA mmho Current Sense Amplifier, CA2 Measured at ITH, VITH = 1.4V Measured at ITH, VITH = 1.4V –40 40 1.5 93 100 50 1 36 102 107 110 107 mV nA mmho µA % Voltage Error Amplifier, EA Input P-Channel FET Driver (INFET) ● ● ● ● 0 0.17 25 0.25 50 6.5 0.25 V mV mV V V –60 5 –25 5.8 Gate Drivers (TGATE, BGATE) 4101f 3 LTC4101 The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDCIN = 20V, VDD = 3.3V, VBAT = 4V unless otherwise noted. (Note 4) SYMBOL VACP PARAMETER DCDIV Threshold DCDIV Hysteresis DCDIV Input Bias Current ACP VOH ACP VOL DCDIV to ACP Delay SafetySignal Decoder SafetySignal Trip (RES_COLD/RES_OR) SafetySignal Trip (RES_IDEAL/RES_COLD) SafetySignal Trip (RES_HOT/RES_IDEAL) SafetySignal Trip (RES_UR/RES_HOT) Time Between SafetySignal Measurements DACs Charging Current Resolution Charging Current Granularity Guaranteed Monotonic Above IMAX/16 RILIM = 0 RILIM = 10k ±1% RILIM = 33k ±1% RILIM = Open (or Short to VDD) All Values of RILIM All Values of RVLIM RILIM = 0 (0-1A) Charging Current = 0x03FF (0x0400 Note 7) RILIM = 10k ±1% (0-2A) Charging Current = 0x07FE (0x0800 Note 7) RILIM = 33k ±1% (0-3A) Charging Current = 0x0BFC (0x0C00 Note 7) RILIM = 0pen (or Short to VDD) (0-4A) Charging Current = 0x0FFC (0x1000 Note 7) Charging Voltage Resolution Charging Voltage Granularity Charging Voltage Limit RVLIM = 0 Charging Voltage = 0x1090 (Note 7) RVLIM = 10k ±1% Charging Voltage = 0x10D0 (Note 7) RVLIM = 33k ±1% Charging Voltage = 0x1150 (Note 7) RVLIM = 100k ±1% Charging Voltage = 0x11A0 (Note 7) RVLIM = 0pen (or Short to VDD) Charging Voltage = 0x1580 (Note 7) 4.206 4.270 4.397 4.476 5.460 Guaranteed Monotonic (2.9V ≤ VBAT ≤ 5.6V) ● ELECTRICAL CHARACTERISTICS AC Present Comparator CONDITIONS VDCDIV Rising from 1V to 1.4V VDCDIV = 1.2V IACP = – 2mA IACP = 1mA VDCDIV = 1.3V RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB = 54.9Ω ±1% RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB = 54.9Ω ±1% RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB = 54.9Ω ±1% RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB = 54.9Ω ±1% DCDIV = 1.3V DCDIV = 1V ● ● ● ● ● MIN 1.14 –1 2 TYP 1.20 25 MAX 1.26 1 0.5 10 UNITS V mV µA V V µs kΩ kΩ kΩ Ω ms ms Bits 95 28.5 2.85 425 100 30 3 500 32 105 31.5 3.15 575 250 10 1 2 4 4 80 (Note 5) 97.3 97.3 72.3 97.3 11 16 4.240 4.304 4.432 4.512 5.504 4.274 4.338 4.467 4.548 5.548 107.3 107.3 82.3 107.3 mA mA mA mA mA mV mV mV mV Bits mV V V V V V 4101f Wake-Up Charging Current (IWAKE-UP) Charging Current Limit CSP – BAT 4 LTC4101 The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDCIN = 20V, VDD = 3.3V, VBAT = 4V unless otherwise noted. (Note 4) SYMBOL Logic Levels VIL VIH VOL IIL IIH VOL ILEAK VOL VIL VIH SCL/SDA Input Low Voltage SCL/SDA Input High Voltage SDA Output Low Voltage SCL/SDA Input Current SCL/SDA Input Current SMBALERT Output Low Voltage SMBALERT Output Pull-Up Current CHGEN Output Low Voltage CHGEN Output Pull-Up Current CHGEN Input Low Voltage CHGEN Input High Voltage Power-On Reset Duration tHIGH tLOW tR tF tSU:STA tHD:STA tHD:DAT tTIMEOUT SCL Serial Clock High Period SCL Serial Clock Low Period SDA/SCL Rise Time SDA/SCL Fall Time Start Condition Setup Time Start Condition Hold Time SDA to SCL Falling-Edge Hold Time, Slave Clocking in Data Time Between Receiving Valid ChargingCurrent() and ChargingVoltage() Commands VDD = 3V VDD = 5.5V VDD Ramp from 0V to >3V in