Product details


Number of series cells (Min) 2 Vin (Max) (V) 25 Features Cell balancing, High-side driver, I2C support, Multi-cell support, Overcurrent in charging protection, Overcurrent in discharging protection, Separate MCU requirement, Short-current detection Number of series cells (Max) 4 Operating temperature range (C) -40 to 85 Rating Catalog open-in-new Find other Battery monitors & balancers

Package | Pins | Size

TSSOP (PW) 24 34 mm² 4.4 x 7.8 VQFNP (RTH) 24 16 mm² 4 x 4 open-in-new Find other Battery monitors & balancers


  • 2-, 3-, or 4-Cell Series Protection Control
  • Can Directly Interface With the bq2084 Gas Gauges
  • Provides Individual Cell Voltages and Battery Voltage to Battery Management Host
  • Integrated Cell Balancing Drive
  • I2C Compatible User Interface Allows Access to Battery Information
  • Programmable Threshold and Delay for Overload and Short Circuit During Charge and Discharge
  • System Alert Interrupt Output
  • Host Control Can Initiate Sleep Power Mode and Ship Mode
  • Integrated 3.3-V, 25-mA LDO
  • Supply Voltage Range From 4.5 V to 25 V
  • Low Supply Current of 60-µA Typical
  • bq29312A is 100% specification compatible with the bq29312
    • Notebook PCs
    • Medical and Test Equipment
    • Portable Instrumentation

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The bq29312A is a 2-, 3-, or 4-cell lithium-ion battery pack protection analog front end (AFE) IC that incorporates a 3.3-V, 25-mA low-dropout regulator (LDO). The bq29312A also integrates an I2C compat- ible interface to extract battery parameters such as cell voltages and control output status. Other par- ameters such as current protection thresholds and delays can be programmed into the bq29312A to increase the flexibility of the battery management system.

The bq29312A provides safety protection for over- charge, overload, short-circuit, overvoltage, and undervoltage conditions with the battery management host. In overload and short-circuit conditions, the bq29312A turns the FET drive off autonomously dependant on the internal configuration setting.

The communications interface allows the host to observe and control the current status of the bq29312A. It enables cell balancing, enters different power modes, sets overload levels, sets the overload blanking delay time, sets short-circuit threshold levels for charge and discharge, and sets the short-circuit blanking delay time.

Cell balancing of each cell is performed via a cell bypass path, which is enabled via the internal control register accessible via the I2C compatible interface. The maximum bypass current is set via an external series resistor and internal FET on resistance (typical 400 ).

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BQ76920 ACTIVE 3 to 5-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family) This product is a 3-s - 5-s monitor with an integrated ADC.
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Technical documentation

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Type Title Date
* Datasheet Two-Cell Three-Cell & Four Cell Lithium-Ion or Lithium-Polymer Battery Protect datasheet (Rev. A) Aug. 30, 2005
* Errata bq20z80-V110 Technical Reference Manual Apr. 05, 2007
Technical article How to stack battery monitors for high-cell-count industrial applications Feb. 11, 2021
User guide bq20z80-V110 + bq29312A Chipset Jul. 31, 2007
Application note Impedance Track(TM) Gas Gauge for Novices Jan. 30, 2006
Application note Comparing the bq29312A to the bq29312 Mar. 07, 2005

Design & development

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CAD/CAE symbols

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TSSOP (PW) 24 View options
VQFN (RTH) 24 View options

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