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  • L9961

Request Information For L9961

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L9961 Overview

The L9961 is part of a complete battery pack monitoring, balancing, and protection system for Li-Ion and Li-Polymer cells in 3, 4 or 5 series configurations. The L9961 uses a high precision ADC to provide cell voltage, stack voltage and temperature conversion via external NTC. Voltage monitoring functions are cyclically performed with a programmable loop time. Stack current is also monitored via a high accuracy CSA, continuously running and performing also Coulomb Counting. Cell balancing is available and can be simultaneously activated on all cells. IC configuration and information exchange for SOC/SOH estimation are performed via I2C peripheral. The IC also integrates a dual pre-driver programmable in both HS/LS configurations for driving pack relays. L9961 also implements battery pack fuse protection to prevent fire and explosion hazards. A 3.3 V regulator with a high current capability is available for supplying pack controller and other external circuitry in both standby and normal operation modes. The IC protects the battery pack against over/under voltage conditions and monitors for over/under temperature. It also features protection against over current (both directions) and short-circuit in discharge events. Safety-relevant configurations can be stored in the internal NVM to avoid re-programming the device at each wakeup.


  • 2 μA SHIPMENT - DEEP SLEEP mode current and 5 μA Standby consumption (with VREG LDO active)
  • Integrated 3.3 V VREG LDO for supplying MCU and LEDs
  • Measures Cell Voltage (3 to 5 cells), with Over/Under voltage detection and Balance Under voltage protection
  • 12-bit voltage measurement with maximum error of ± 15 mV in the [1.5 – 4.5] V range, for -40 °C
  • Measures Stack Voltage, with Over/Under voltage detection and Plausibility Check vs. Sum Of Cells
  • Measures Pack Temperature via NTC, with Over/Under Temperature detection
  • Ratiometric temperature measurement with ± 0.8% max. gain error in the [0.2 – VREG] V range, for -40 °C
  • Measures Battery Current, with Coulomb Counting, Over current (both directions) and Short-circuit in discharge protection.
  • 16-bit signed current measurement with maximum error of 0.25%, for -40 °C
  • I2C peripheral for device programming and data transfers over I2C bus
  • Cell balancing supporting up to 70 mA per cell
  • Dual configurable HS/LS pre-driver for pack relay management
  • Pack fuse management
  • Embedded NVM for configuration parameters storage
  • High hot plug robustness

Product Parameters

  • prmis_id


  • item_name


  • p_445

  • p_1387


  • p_4418


  • parent_id


  • p_4906


  • p_5113


  • p_163


Other distributor's price

Distributor Part # Mfg. Description Price
digikey L9961 STMicroelectronics 10GX TRACEABLE PCORD ORG 7FT


mouser L9961 STMicroelectronics STMicroelectronics Chip for consumer battery management applications up to 5 cells



newark L9961 STMicroelectronics Battery Monitor, Li-Ion/Pol, 85Deg C Rohs Compliant: Yes |Stmicroelectronics L9961TR