General Description

The MAX1879 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.

Features

♦ 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

Single-Cell Li+ Powered Portables

Self-Charging Battery Packs

PDAs

Cell Phones

Cradle Chargers