NOTICE - The following device(s) are recommended alternatives:
ISL94202 - Standalone 3 to 8 Cell Li-Ion Battery Pack Monitor
The ISL94203 is not recommened for new designs. The recommended replacement is ISL94202.

The ISL94203 is a Li-ion battery monitor IC that supports from 3 to 8 series connected cells. It provides full battery monitoring and pack control. The ISL94203 provides automatic shutdown and recovery from out of bounds conditions and automatically controls pack cell balancing. The ISL94203 is highly configurable as a stand-alone unit, but can be used with an external microcontroller, which communicates to the IC through an I2C interface.


  • Eight cell voltage monitors support Li-ion CoO2, Li-ion Mn2O4 and Li-ion FePO4 chemistries
  • Stand-alone pack control - no microcontroller needed
  • Multiple voltage protection options (each programmable to 4.8V; 12-bit digital value) and selectable overcurrent protection levels
  • Programmable detection/recovery times for overvoltage, undervoltage, overcurrent and short-circuit conditions
  • Configuration/calibration registers maintained in EEPROM
  • Open battery connect detection
  • Integrated charge/discharge FET drive circuitry with built-in charge pump supports high-side N-channel FETs
  • Cell balancing uses external FETs with internal state machine or external microcontroller
  • Enters low power states after periods of inactivity. Charge or discharge current detection resumes normal scan rates


  • Power tools
  • Battery back-up systems
  • E-bikes

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active TQFN Tube 50
Active TQFN Reel 4000
Active TQFN Reel 1000
Active TQFN Reel 250

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL94203 Datasheet Datasheet PDF 2.92 MB
User Guides & Manuals
ISO-DONGLE1Z User's Manual Manual PDF 233 KB
ISL94203EVKIT1Z User's Manual Manual PDF 4.49 MB
ISL94202 EEPROM Programming User Guide Manual PDF 811 KB
Application Notes & White Papers
Putting Safety into Li-ion Battery Packs 简体中文 White Paper PDF 451 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
Battery Management System Tutorial 简体中文 White Paper PDF 451 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
PCN15011 - ISL94203 design change Product Change Notice PDF 94 KB
ISL94203EVKIT1Z Design Files Design File ZIP 6.45 MB
Analog ICs Brochure 日本語 Brochure PDF 4.20 MB
ISL94202EVKIT1Z, ISL94203EVKIT1Z Evaluation Kit GUI with Source Code v1.0 Library ZIP 926 KB
ISL94202 EEPROM Software v1.50 Library ZIP 699 KB
Industrial Power Management Brochure ( R16CL0001EJ0200 ) 日本語 Brochure PDF 3.13 MB
ISL94202EVKIT1Z, ISL94203EVKIT1Z Installer Software v306 Library EXE 2.78 MB

Boards & Kits

Part Number Title Type Company
ISL94203EVKIT1Z 3- to 8-Cell Li-ion Battery Pack Monitor Evaluation Kit Evaluation Renesas