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.
The MAX1666 protects the battery pack in an overcurrent
condition by disconnecting the pack from the load at a programmable
limit. On-chip power MOSFET drivers control
external P-channel MOSFETs to disconnect the cells from
external terminals when faults occur.
The MAX1666 employs a unique timing scheme that
allows three modes of operation for optimal performance
and battery power conservation. The MAX1666 can operate
in a stand-alone configuration or in conjunction with a
microcontroller. It is available in four versions: the S version
monitors two Li+ cells, the A and V versions monitor
three cells, and the X version monitors four cells. When
the charge path is disabled by the charge control pin, the
MAX1666A reduces current consumption compared to
the MAX1666S/V/X.
Key Features
Applications/Uses
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
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