Intersil – Highly integrated battery-monitoring IC ensures safe operation of li-ion cells

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The ISL94202 from Intersil, now part of Renesas, is a lithium-ion battery- monitoring IC for use with between three and eight series-connected cells.

It provides a complete set of battery- monitoring and control functions, including voltage and current sensing. The ISL94202 also provides for automatic shut-down and recovery after the battery goes beyond its rated operating conditions, and automatically controls passive cell-balancing switches.

The configurable ISL94202 can operate as a stand-alone device, or with an external microcontroller, which communicates to the IC through an I2C interface. For operation in stand-alone mode, an internal EEPROM can be user-configured with dedicated protection settings.

The ISL94202 measures the voltage individually at each cell in the battery pack, and performs high-side current measurement. This provides for high accuracy, enabling users to make reliable state-of-charge calculations and to implement meaningful fuel gauging.

The IC can handle inputs from one or two temperature sensors. It can also control high- side nMOS protection switches in a series Charge/Discharge configuration.

The device draws 13μA in sleep mode and less than 1μA in power-down mode. This means that a battery pack can be stored for a long period without the risk of fully discharging the cells.

FEATURES

  • Supports LiCoO2, LiMn2O4 and LiFePO4 chemistries
  • Short-circuit detection and protection
  • Programmable detection/recovery times for over-voltage, under-voltage, over-current, and short-circuit conditions
  • Detection of open battery connection

APPLICATIONS

  • Power tools
  • Battery back-up systems
  • Light electric vehicles
  • Portable equipment
  • Energy-storage systems
  • Solar farms
  • Medical equipment/hospital beds
  • Monitoring equipment
  • Ventilators

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Orderable Part Number: ISL94202EVKIT1Z

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