The LTC1759CG Smart Battery Charger is a single chip charging solution that dramatically simplifies construction of an SBS compliant system. The LTC1759CG implements a Level 2 charger function whereby the charger can be programmed by the battery or by the host. A thermistor 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 thermistor 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 chemistry specific 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.
Feature
- Single Chip Smart Battery Charger Controller
- 100% Compliant (Rev 1.0) SMBus Support Allows for Operation with or without Host
- SMBus Accelerator Improves SMBus Timing
- Hardware Interrupt and SMBAlert Response Eliminate Interrupt Polling
- High Efficiency Synchronous Buck Charger
- 0.5V Dropout Voltage; Maximum Duty Cycle > 99.5%
- AC Adapter Current Limit Maximizes Charge Rate*
- 1% Voltage Accuracy; 5% Current Accuracy
- Up to 8A Charging Current Capability
- Dual 10-Bit DACs for Charger Voltage and Current Programming
- User-Selectable Overvoltage and Overcurrent Limits
- High Noise Immunity Thermistor Sensor
- Small 36-Lead Narrow (0.209 Inches) SSOP Package
Applications
- Portable Computers
- Portable Instruments
- Docking Stations
(Picture: Pinout)
