General Description

The MAX1898, with an external PNP or PMOS transistor, forms a complete charger for 1-cell lithium-ion (Li+) batteries. The MAX1898 provides accurate constant-current/constant-voltage charging. Battery regulation voltage accuracy is ±0.75 for optimum battery performance and cycle life. Charging current is user set, but is sensed internally so no external current-sense resistor is needed.

Features

♦ Simple, Safe Linear Charger

♦ Uses Low-Cost PNP or PMOS Pass Element

♦ 4.5V to 12V Input Range

♦ Internal Current-Sense Resistor

♦ ±0.75 Voltage Accuracy

♦ Programmable Charging Current

♦ Automatic Input Power-Source Detection

♦ LED Charge Status Indicator

♦ Programmable Safety Timer

♦ Current-Sense Monitor Output

♦ Optional/Adjustable Auto-Restart

♦ Small µMAX Package

Applications

Single-Cell Li+ Powered Portables

Self-Charging Battery Packs

PDAs

Cell Phones

Cradle Chargers