LTC4100_09

LTC4100 Smart Battery Charger Controller FEATURES n n n n n n n n n n n n n n n DESCRIPTION The LTC®4100 Smart Battery Charger is a single chip charging solution that dramatically simplifies construction of an SBS compliant system. The LTC4100 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. Single Chip Smart Battery Charger Controller 100% Compliant (Rev. 1.1) SMBus Support Allows for Operation with or without Host SMBus Accelerator Improves SMBus Timing Wide Output Voltage Range: 3.5V to 26V Hardware Interrupt and SMBAlert Response Eliminate Interrupt Polling High Efficiency Synchronous Buck Charger 0.5V Dropout Voltage; Maximum Duty Cycle > 98% AC Adapter Current Limit Maximizes Charge Rate ±0.8% Voltage Accuracy; ±4% Current Accuracy Up to 4A Charging Current Capability 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 APPLICATIONS n n Portable Instruments and Computers Data Storage Systems and Battery Backup Servers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6650174 and 5723970. TYPICAL APPLICATION DCIN 13.7k 3V TO 5.5V 1.21k 17 11 CHGEN ACP 6 10 7 9 8 15 16 13 1.13k 10k 54.9k 0.068μF 0.12μF SafetySignal SMBCLK SMBDAT 4100 TA01 0.1μF VBAT < 5.5V > 5.5V PART LTC4101 LTC4100 LTC4100 VDD DCDIV CHGEN ACP SMBALERT SCL SDA THB THA ILIM VLIM IDC 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 0.1μF 5k 0.033Ω SYSTEM LOAD 20μF 10μH 20μF 0.025Ω SMART BATTERY 14 20 0.01μF 0.0015μF 0.1μF 100Ω SMBALERT# SMBCLK SMBDAT Figure 1. 4A Smart Battery Charger 4100fb 1 LTC4100 ABSOLUTE MAXIMUM RATINGS (Note 1) PIN CONFIGURATION 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 INFORMATION LEAD FREE FINISH LTC4100EG#PBF LEAD BASED FINISH LTC4100EG TAPE AND REEL LTC4100EG#TRPBF TAPE AND REEL LTC4100EG#TR PART MARKING LTC4100EG PART MARKING LTC4100EG PACKAGE DESCRIPTION 24-Lead Plastic SSOP PACKAGE DESCRIPTION 24-Lead Plastic SSOP TEMPERATURE RANGE –40°C to 85°C TEMPERATURE RANGE –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS SYMBOL IDCIN VTOL ITOL VDD Shutdown Battery Leakage Current UVLO Undervoltage Lockout Threshold VDD Power-Fail DCIN Current in Shutdown PARAMETER DCIN Operating Range DCIN Operating Current Charge Voltage Accuracy Charge Current Accuracy (Note 3) VDD Operating Voltage The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDCIN = 20V, VDD = 3.3V, VBAT = 12V unless otherwise noted. (Note 4) CONDITIONS ● MIN 6 TYP 3 MAX 28 5 0.8 1 4 5 5.5 UNITS V mA % % % % V μA V V mA 4100fb Charging, Sum of Currents on DCIN, CLP and CLN (Note 2) ● –0.8 –1 –4 –5 3 15 4.2 4.7 2 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 2 LTC4100 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Input Bias Current into BAT Pin CMSL CMSH ITMAX ITREV CA1/I1 Input Common Mode Low CA1/I1 Input Common Mode High VDCIN ≤ 28V ● ● ● The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDCIN = 20V, VDD = 3.3V, VBAT = 12V unless otherwise noted. (Note 4) CONDITIONS MIN TYP 11.66 0 VCLN –0.2 140 165 – 30 1 Measured at ITH, VITH = 1.4V Measured at ITH, VITH = 1.4V –40 40 1.5 ● MAX UNITS μA V V mV mV mmho μA μA mmho Current Sense Amplifier, CA1 Current Comparators ICMP and IREV Maximum Current Sense Threshold (VCSP –VBAT) VITH = 2.5V 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 4100fb 200 Current Sense Amplifier, CA2 93 100 100 1 107 mV nA mmho μA Voltage Error Amplifier, EA Measured at ITH, VITH = 1.4V ● 36 102 107 110 % Input P-Channel FET Driver (INFET) DCIN Voltage Ramping Up from VCLP –0.05V ● ● ● 0 –60 5 0.17 25 –25 5.8 0.25 50 6.5 0.25 V mV mV V V IINFET = 1μA IINFET = –25μA ● Gate Drivers (TGATE, BGATE) 3 LTC4100 ELECTRICAL CHARACTERISTICS 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 = 0x2260 (Note 7) RVLIM = 10k ±1% Charging Voltage = 0x3330 (Note 7) RVLIM = 33k ±1% Charging Voltage = 0x4400 (Note 7) RVLIM = 100k ±1% Charging Voltage = 0x5400 DCIN ≥ 22V (Note 7) RVLIM = 0pen (or Short to VDD) Charging Voltage = 0x6D60 DCIN ≥ 29V (Note 7) 8.730 12.999 17.269 21.538 Guaranteed Monotonic (2.9V ≤ VBAT ≤ 28V) 97.3 97.3 72.3 97.3 11 16 8.800 13.104 17.408 21.712 8.870 13.209 17.547 21.886 10 1 2 4 4 80 (Note 5) 107.3 107.3 82.3 107.3 Bits mA mA mA mA mA mV mV mV mV Bits mV V V V V 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 ● ● ● ● The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDCIN = 20V, VDD = 3.3V, VBAT = 12V unless otherwise noted. (Note 4) CONDITIONS VDCDIV Rising from 1V to 1.4V VDCDIV = 1.2V IACP = – 2mA IACP = 1mA VDCDIV = 1.3V 95 28.5 2.85 425 100 30 3 500 32 250 ● MIN 1.14 –1 2 TYP 1.20 25 MAX 1.26 1 0.5 10 105 31.5 3.15 575 UNITS V mV μA V V μs kΩ kΩ kΩ Ω ms ms AC Present Comparator Wake-Up Charging Current (IWAKE-UP) Charging Current Limit CSP – BAT 27.781 28.006 28.231 V 4100fb 4 LTC4100 ELECTRICAL CHARACTERISTICS SYMBOL VIL VIH VOL IIL IIH VOL ILEAK VOL VIL VIH PARAMETER 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 SDA/SCL/SMBALERT Power Down Leakage 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 VDD = 3V VDD = 5.5V VDD Ramp from 0V to >3V in