LTC4100EG#TRPBF

LTC4100 Smart Battery Charger Controller Features Description Single Chip Smart Battery Charger Controller n 100% Compliant (Rev. 1.1) SMBus Support Allows for Operation with or without Host n SMBus Accelerator Improves SMBus Timing n Wide Output Voltage Range: 3.5V to 26V n Hardware Interrupt and SMBAlert Response Eliminate Interrupt Polling n High Efficiency Synchronous Buck Charger n 0.5V Dropout Voltage; Maximum Duty Cycle > 98% n AC Adapter Current Limit Maximizes Charge Rate n ±0.8% Voltage Accuracy; ±4% Current Accuracy n Up to 4A Charging Current Capability n 10-Bit DAC for Charge Current Programming n 11-Bit DAC for Charger Voltage Programming n User-Selectable Overvoltage and Overcurrent Limits n High Noise Immunity SafetySignal Sensor n Available in a 24-Pin SSOP Package 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). n 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. Applications Portable Instruments and Computers Data Storage Systems and Battery Backup Servers n n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath is a trademark 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 3V TO 5.5V 1.21k 17 11 6 CHGEN 10 ACP 7 9 8 15 16 13 1.13k 14 10k 54.9k SMBALERT# 0.1µF 13.7k 20 LTC4100 VDD DCIN DCDIV INFET CHGEN CLP ACP CLN SMBALERT TGATE SCL BGATE SDA PGND THB CSP THA BAT ILIM VSET VLIM ITH IDC GND 0.068µF 0.1µF 5 4 0.033Ω VBAT PART < 5.5V > 5.5V LTC4101 LTC4100 5k 24 23 SYSTEM LOAD 20µF 1 3 SMART BATTERY 0.025Ω 10µH 2 20µF 21 22 18 19 12 0.01µF 6.04k 100Ω 0.0015µF 0.12µF 0.1µF SafetySignal SMBCLK SMBCLK SMBDAT SMBDAT Figure 1. 4A Smart Battery Charger For more information www.linear.com/LTC4100 4100 TA01 4100fc 1 LTC4100 Absolute Maximum Ratings Pin Configuration (Note 1) TOP VIEW 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 TGATE 1 24 CLP PGND 2 23 CLN BGATE 3 22 BAT INFET 4 21 CSP DCIN 5 20 IDC CHGEN 6 19 ITH SMBALERT 7 18 VSET SDA 8 17 VDD SCL 9 16 THA ACP 10 15 THB DCDIV 11 14 VLIM GND 12 13 ILIM G PACKAGE 24-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 90°C/W Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4100EG#PBF LTC4100EG#TRPBF LTC4100EG 24-Lead Plastic SSOP –40°C to 85°C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4100EG LTC4100EG#TR LTC4100EG 24-Lead Plastic SSOP –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 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) SYMBOL PARAMETER CONDITIONS DCIN Operating Range MIN ● IDCIN DCIN Operating Current Charging, Sum of Currents on DCIN, CLP and CLN VTOL Charge Voltage Accuracy (Note 2) ITOL Charge Current Accuracy (Note 3) VDD TYP 6 3 MAX UNITS 28 V 5 mA ● –0.8 –1 0.8 1 % % VCSP – VBAT Target = 102.3mV IDAC = 0xFFFF ● –4 –5 4 5 % % VDD Operating Voltage 0V ≤ VDCIN ≤ 28V ● 3 5.5 V Battery Leakage Current DCIN = 0V, VCLP = VCLN = VCSP = VBAT ● 15 35 µA Undervoltage Lockout Threshold DCIN Rising, VBAT = 0V ● 4.7 5.5 V VDD Power-Fail Part Held in Reset Until this VDD Present ● DCIN Current in Shutdown VCHGEN = 0V Shutdown UVLO 2 4.2 2 3 V 3 mA 4100fc For more information www.linear.com/LTC4100 LTC4100 Electrical Characteristics 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) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Current Sense Amplifier, CA1 Input Bias Current into BAT Pin CMSL CA1/I1 Input Common Mode Low CMSH CA1/I1 Input Common Mode High 11.66 ● VDCIN ≤ 28V µA 0 V VCLN –0.2 ● V Current Comparators ICMP and IREV ITMAX Maximum Current Sense Threshold (VCSP –VBAT) VITH = 2.5V ITREV Reverse Current Threshold (VCSP –VBAT) ● 140 165 200 – 30 mV mV Current Sense Amplifier, CA2 Transconductance 1 mmho Source Current Measured at ITH, VITH = 1.4V –40 µA Sink Current Measured at ITH, VITH = 1.4V 40 µA Current Limit Amplifier Transconductance VCLP Current Limit Threshold ICLN CLN Input Bias Current 1.5 ● 93 100 mmho 107 100 mV nA Voltage Error Amplifier, EA Transconductance 1 Measured at ITH, VITH = 1.4V Sink Current OVSD Overvoltage Shutdown Threshold as a Percent of Programmed Charger Voltage mmho 36 µA ● 102 107 110 % ● 0 0.17 0.25 V 25 50 Input P-Channel FET Driver (INFET) DCIN Detection Threshold (VDCIN –VCLP) DCIN Voltage Ramping Up from VCLP –0.05V Forward Regulation Voltage (VDCIN –VCLP) ● Reverse Voltage Turn-Off Voltage (VDCIN –VCLP) ● –60 –25 ● 5 5.8 INFET ON Clamping Voltage (VDCIN –VINFET) IINFET = 1µA INFET OFF Clamping Voltage (VDCIN –VINFET) IINFET = –25µA mV mV 6.5 V 0.25 V 345 kHz Oscillator fOSC Regulator Switching Frequency 255 300 fMIN Regulator Switching Frequency in Drop Out Duty Cycle ≥ 98% 20 25 kHz DCMAX Regulator Maximum Duty Cycle VCSP = VBAT 98 99 % Gate Drivers (TGATE, BGATE) VTGATE High (VCLP-VTGATE) ITGATE = –1mA 50 mV VBGATE High CLOAD = 3000pF 4.5 VTGATE Low (VCLP-VTGATE) CLOAD = 3000pF 4.5 5.6 10 V 5.6 10 V VBGATE Low IBGATE = 1mA 50 mV TGTR TGTF TGATE Transition Time TGATE Rise Time TGATE Fall Time CLOAD = 3000pF, 10% to 90% CLOAD = 3000pF, 10% to 90% 50 50 110 100 ns ns BGTR BGTF BGATE Transition Time BGATE Rise Time BGATE Fall Time CLOAD = 3000pF, 10% to 90% CLOAD = 3000pF, 10% to 90% 40 40 90 80 ns ns VTGATE at Shutdown (VCLN-VTGATE) ITGATE = –1µA 100 mV VBGATE at Shutdown ITGATE = 1µA 100 mV 4100fc For more information www.linear.com/LTC4100 3 LTC4100 Electrical Characteristics 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) SYMBOL PARAMETER CONDITIONS MIN TYP MAX 1.14 1.20 1.26 UNITS AC Present Comparator VACP DCDIV Threshold VDCDIV Rising from 1V to 1.4V ● DCDIV Hysteresis 25 DCDIV Input Bias Current VDCDIV = 1.2V –1 ACP VOH IACP = –2mA 2 ACP VOL DCDIV to ACP Delay V mV 1 µA IACP = 1mA 0.5 V VDCDIV = 1.3V 10 µs V SafetySignal Decoder SafetySignal Trip (RES_COLD/RES_OR) RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB = 54.9kΩ ±1% ● 95 100 105 kΩ SafetySignal Trip (RES_IDEAL/RES_COLD) RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB = 54.9kΩ ±1% ● 28.5 30 31.5 kΩ SafetySignal Trip (RES_HOT/RES_IDEAL) RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB = 54.9kΩ ±1% ● 2.85 3 3.15 kΩ SafetySignal Trip (RES_UR/RES_HOT) RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB = 54.9kΩ ±1% ● 425 500 575 Ω Time Between SafetySignal Measurements DCDIV = 1.3V DCDIV = 1V 250 ms ms Charging Current Resolution Guaranteed Monotonic Above IMAX/16 Charging Current Granularity RILIM = 0 RILIM = 10k ±1% RILIM = 33k ±1% RILIM = Open (or Short to VDD) Wake-Up Charging Current (IWAKE-UP) All Values of RILIM All Values of RVLIM Charging Current Limit CSP – BAT RILIM = 0 (0-1A) Charging Current = 0x03FF (0x0400 Note 7) 97.3 107.3 mV RILIM = 10k ±1% (0-2A) Charging Current = 0x07FE (0x0800 Note 7) 97.3 107.3 mV RILIM = 33k ±1% (0-3A) Charging Current = 0x0BFC (0x0C00 Note 7) 72.3 82.3 mV RILIM = 0pen (or Short to VDD) (0-4A) Charging Current = 0x0FFC (0x1000 Note 7) 97.3 107.3 mV Guaranteed Monotonic (2.9V ≤ VBAT ≤ 28V) 11 32 DACs Charging Voltage Resolution 10 1 2 4 4 4 mA mA mA mA 80 (Note 5) Charging Voltage Granularity Charging Voltage Limit Bits mA Bits 16 mV RVLIM = 0 Charging Voltage = 0x2260 (Note 7) 8.730 8.800 8.870 V RVLIM = 10k ±1% Charging Voltage = 0x3330 (Note 7) 12.999 13.104 13.209 V RVLIM = 33k ±1% Charging Voltage = 0x4400 (Note 7) 17.269 17.408 17.547 V RVLIM = 100k ±1% Charging Voltage = 0x5400 DCIN ≥ 22V (Note 7) 21.538 21.712 21.886 V RVLIM = 0pen (or Short to VDD) Charging Voltage = 0x6D60 DCIN ≥ 29V (Note 7) 27.781 28.006 28.231 V 4100fc For more information www.linear.com/LTC4100 LTC4100 Electrical Characteristics 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) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Logic Levels VIL SCL/SDA Input Low Voltage VDD = 3V and VDD = 5.5V ● VIH SCL/SDA Input High Voltage VDD = 3V and VDD = 5.5V ● ● 0.8 2.1 V V VOL SDA Output Low Voltage IPULL-UP = 350µA 0.4 V IIL SCL/SDA Input Current VSDA, VSCL = VIL –1 1 µA IIH SCL/SDA Input Current VSDA, VSCL = VIH –1 1 µA VOL SMBALERT Output Low Voltage IPULL-UP = 500µA SMBALERT Output Pull-Up Current VSMBALERT = VOL ILEAK SDA/SCL/SMBALERT Power Down Leakage VSDA, VSCL, VSMBALERT = 5.5V, VDD = OV ● VOL CHGEN Output Low Voltage IOL = 100µA ● CHGEN Output Pull-Up Current VCHGEN = VOL ● –17.5 –2 –17.5 VIL CHGEN Input Low Voltage VIH CHGEN Input High Voltage VDD = 3V VDD = 5.5V Power-On Reset Duration VDD Ramp from 0V to >3V in