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.
MAX1666A、MAX1666S、MAX1666V、MAX1666X:典型工作电路 MAX1666A、MAX1666S、MAX1666V、MAX1666X:典型工作电路 放大+


  • 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


  • 2节/3节/4节Li+电池组
申请可靠性报告: MAX1666X 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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