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