DESCRIPTION
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.

FEATURES
■ 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 Effi ciency 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

APPLICATIONS
■ Portable Instruments and Computers
■ Data Storage Systems and Battery Backup Servers