General Description

The MAX1666 provides complete protection against overvoltage, undervoltage, overcharge current, overdischarge current, and cell mismatch for 2-cell to 4-cell lithium-ion (Li+) battery packs. The voltage of each cell in the battery pack is checked and compared to the programmable threshold and to the other cells in the pack.

Features

♦ Overvoltage Protection

Programmable Limits from +4.0V to +4.4V

Accurate to ±0.5

♦ Undervoltage Protection

Programmable Limits from +2.0V to +3.0V

Accurate to ±2.5

♦ Cell Mismatch Protection

Programmable Limits from 0 to 500mV

Accurate to ±10

♦ Overcharge Current Protection

♦ Overdischarge Current Protection

♦ Low 30µA (typ) Operating Supply Current

♦ Low 1µA (max) Standby Current

♦ +28V (max) Input Voltage

♦ Available in Small 16-Pin QSOP (MAX1666S) and 20-Pin QSOP (MAX1666A/V/X) Packages

Applications

2/3/4-Cell Lithium-Ion Battery Pack