LTC4101 Smart Battery Charger Controller FEATURES DESCRIPTION n Single Chip Smart Battery Charger Controller The LTC 4101 Smart Battery Charger is a single chip n 100% Compliant (Rev. 1.1) SMBus Support Allows charging solution that dramatically simpli es construction for Operation with or without Host of an SBS compliant system. The LTC4101 implements n Up to 4A Charging Current Capability a Level 2 charger function whereby the charger can be n High Ef ciency Synchronous Buck Charger programmed by the battery or by the host. A SafetySignal n V Optimized 3V to 5.5V on the battery being charged is monitored for temperature, BAT n SMBus Accelerator Improves SMBus Timing connectivity and battery type information. The SMBus n Hardware Interrupt and SMBAlert Response interface remains alive when the AC power adapter is Eliminate Interrupt Polling removed and responds to all SMBus activity directed to n 0.5V Dropout Voltage Maximum Duty Cycle > 98% it, including SafetySignal status (via the ChargerStatus n AC Adapter Current Limit Maximizes Charge Rate command). The charger also provides an interrupt to the n 0.8% Voltage Accuracy 4% Current Accuracy host whenever a status change is detected (e.g., battery n 10-Bit DAC for Charge Current Programming removal, AC adapter connection). n 11-Bit DAC for Charger Voltage Programming Charging current and voltage are restricted to chemistry- n User-Selectable Overvoltage and Overcurrent Limits speci c limits for improved system safety and reliability. n High Noise Immunity SafetySignal Sensor Limits are programmable by two external resistors. Ad- n Available in a 24-Pin SSOP Package ditionally, the maximum average current from the AC adapter is programmable to avoid overloading the adapter APPLICATIONS when simultaneously supplying load current and charging n Portable Instruments and Computers current. When supplying system load current, charg- n Data Storage Systems and Battery Backup Servers ing current is automatically reduced to prevent adapter L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear overload. Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6650174, 5723970. TYPICAL APPLICATION DCIN 9V to 12V, 2A 0.1F V PART BAT 6.04k 1.21k 3V < 5.5V LTC4101 TO 5.5V > 5.5V LTC4100 0.1F 0.05 LTC4101 17 5 V DCIN DD 11 4 5k DCDIV INFET 6 24 CHGEN CHGEN CLP SYSTEM LOAD 10 23 ACP ACP CLN 5F SMART BATTERY 0.1 1% 7 1 SMBALERT TGATE 9 3 24H SCL BGATE 8 2 SDA PGND 5F 15 21 THB CSP 16 22 THA BAT 13 18 I V LIM SET 1.13k 14 19 100 V I 0.03F LIM TH 20 12 I GND 10k DC 6.04k 0.0015F 54.9k 0.068F 0.12F 0.1F SafetySignal SMBALERT SMBCLK SMBCLK SMBDAT SMBDAT 4101 F01a Figure 1. 1A Smart Battery Charger 4101fa 1LTC4101 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) TOP VIEW Voltage from V to GND ................................. 7V/0.3V DD TGATE 1 24 CLP Voltage from CHGEN, DCDIV, SDA, PGND 2 23 CLN SCL and SMBALERT to GND ............................ 7V/0.3V BGATE 3 22 BAT Voltage from DCIN, CLP, CLN to GND............. 32V/0.3V INFET 4 21 CSP Voltage from CLP to CLN .......................................0.3V DCIN 5 20 I DC CHGEN 6 I PGND wrt. GND ..................................................... 0.3V 19 TH SMBALERT 7 18 V SET CSP, BAT to GND ............................................... 28V/5V SDA 8 17 V DD Operating Ambient Temperature Range (Note 4) SCL 9 THA 16 .................................................................40C to 85C ACP 10 15 THB Junction Temperature Range ................ 40C to 125C DCDIV 11 14 V LIM Storage Temperature Range ...................65C to 150C GND 12 I 13 LIM Lead Temperature (Soldering, 10 sec) .................. 300C G PACKAGE 24-LEAD PLASTIC SSOP T = 125C, = 90C/W JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4101EG PBF LTC4101EG TRPBF LTC4101EG 24-Lead Plastic SSOP 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4101EG LTC4101EG TR LTC4101EG 24-Lead Plastic SSOP 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. For more information on lead free part marking, go to: