The MAX1879EUA single-cell lithium-ion (Li+) battery charger utilizes an efficient pulse-charging architecture to minimize power dissipation in portable devices. This architecture combines the efficiency of switch-mode chargers with the simplicity and low cost of linear chargers. This simple device, in conjunction with a current-limited wall cube and a PMOS transistor, allows safe and fast charging of a single Li+ cell.The MAX1879EUA initiates charging in one of three ways: battery insertion, charger power-up, or toggling the THERM pin. Key safety features include continuous voltage and temperature monitoring, a preset charger time-out, and an 8mA precharge current mode to charge near-dead cells. Automatic detection of input power removal shuts down the device, minimizing current drain from the battery. An overall system accuracy of 0.75% ensures that the cell capacity is fully utilized without cycle life degradation.The MAX1879EUA is offered in a space-saving 8-pin μMAX package. An evaluation kit (MAX1879EVKIT) is available to help reduce design time.
Feature
- Simple Design Minimizes Heat
- Low Component Count, No Inductor
- Battery-Full Indicator
- 0.75% Accurate Battery Regulation
- 1.5μA (max) Battery Current Drain with Wall Cube Removed
- Restart Charging at 4.0V
- Continuous Overvoltage and Overtemperature Protection
- Safely Precharges Near-Dead Cells
- Automatic Power-Down when Power Source is Removed
- Charges 1 Cell from as Low as 4.5V
- Pin-Compatible Upgrade to MAX1679
Applications
- Cell Phones
- Consumer Audio
- Cordless Phones
- Digital Still Cameras
- Global Positioning Systems (GPS)
- Pagers
- Palmtops, Handy Terminals
- Pen Entry Palmtops, PDAs and Organizers
- Smart Battery Packs/Chargers
