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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