General Description

The MAX1894/MAX1924 are lithium-ion/lithium-polymer (Li+) battery-pack protector ICs for 3- or 4-series Li+ bat tery packs. The MAX1894/MAX1924 enhance the useful operating life of Li+ batteries by monitoring individual cell voltages and preventing over/undervoltage conditions. The MAX1894/MAX1924 also protect the battery pack against charge current, discharge current, and pack short fault conditions.

Features

♦ Protect Against Cell Overvoltage

Factory Programmable Limits from 4V to 4.4V Accurate to ±0.5

♦ Protect Against Cell Undervoltage Factory Programmable Limits from 2V to 3.2V Accurate to ±2.0

♦ Protect Against Charge, Discharge, and Pack Short Current Faults

♦ Automatically Trickle Charges Deeply Discharged Cells

♦ Fully Integrated MOSFET Drivers Do Not Require Pullup Resistors

♦ 0.8µA (typ) Shutdown Supply Current Prevents Deep Discharge of Cells

♦ 30µA (typ) Operating Supply Current

♦ 28V (max) Input Voltage

♦ Available in Small 16-Pin QSOP Package

Applications

3- or 4-Series Li+ Battery Packs