ISL94208

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

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
Production Status
Mass Production
# Series Cells
4 to 6 Cells
Communication Interface
I2C
Implementation
Pack
Cell Balancing
Internal
Pack Voltage
8V to 27V
Absolute Cell Voltage Measurement Accuracy
30mV Max (-40°C to 85°C)
Integrated Charge/Discharge FET Drive
Yes
Integrated Current Sense/Detection
Yes (Low Side Detection)
Integrated Temperature Sense
Yes
IS (max)
510 µA
SHDN ICC
(typ) 1 µA
Integrated Regulator Output/Reference Output
3.3V / 3V
Special Features
*Analog Voltage Output
*Robust Hot Plug Performance
*Provides Diagnostic Information
Package
32Ld QFN (5x5mm)
Qualification Level
Standard
Can Sample
YES
Temperature Range
-40 to +85

Confirm below disclaimers

Input Renesas account name and password