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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 ¡À0.5

? Undervoltage Protection

Programmable Limits from +2.0V to +3.0V

Accurate to ¡À2.5

? Cell Mismatch Protection

Programmable Limits from 0 to 500mV

Accurate to ¡À10

? Overcharge Current Protection

? Overdischarge Current Protection

? Low 30?A (typ) Operating Supply Current

? Low 1?A (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