ISL94208

4- to 6-Cell Li-ion Battery Management Analog Front-End

Product Status: Mass Production

OVERVIEW

The ISL94208 battery front end IC is designed for use with a microcontroller and features an analog front-end with overcurrent protection for multi-cell Li-ion battery packs. The ISL94208 supports battery packs consisting of four to six cells in series and one or more cells in parallel.

Using an internal analog multiplexer, the ISL94208 allows a separate microcontroller with an A/D converter to monitor each cell voltage plus internal and external temperature.

The ISL94208 provides integral overcurrent and short-circuit protection circuitry, an internal 3.3V voltage regulator, internal cell balancing switches, and drive circuitry for external FET devices for control of pack charge and discharge.

KEY FEATURES

  • Software selectable overcurrent protection levels and variable protect detection times
  • 4 discharge overcurrent thresholds
  • 4 short-circuit thresholds
  • 4 charge overcurrent thresholds
  • 8 overcurrent delay times (charge)
  • 8 overcurrent delay times (discharge)
  • 2 short-circuit delay times (discharge)
  • Automatic FET turn-off and cell balance disable on reaching external (battery) or internal (IC) temperature limit
  • Automatic cell balance turn off on IC over-temperature
  • Integrated charge/discharge FET drive circuitry
  • Internal cell balancing FETs handle up to 200mA of balancing current for each cell
  • Sleep operation with negative or positive edge wake-up
  • <10μA Sleep mode

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL94208
Basic Information
生产状态
Mass Production
#串联电池
4 to 6 Cells
通信接口
I2C
实施
Pack
电量平衡
Internal
电池组电压
8V to 27V
绝对电池电压测量精度
30mV Max (-40°C to 85°C)
集成充电/放电FET驱动
Yes
集成电流感应/检测
Yes (Low Side Detection)
集成温度检测
Yes
IS (最大值)
510 µA
SHDN ICC
(typ) 1 µA
集成调节器输出/基准输出
3.3V / 3V
特殊功能
*Analog Voltage Output
*Robust Hot Plug Performance
*Provides Diagnostic Information
封装
32Ld QFN (5x5mm)
资质级别
Standard
CAN 采样
YES
温度范围
-40 to +85

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