Product details


Number of series cells (Min) 2 Vin (Max) (V) 25 Number of series cells (Max) 4 Operating temperature range (C) -25 to 85 Rating Catalog open-in-new Find other Battery monitors & balancers

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TSSOP (PW) 24 34 mm² 4.4 x 7.8 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 Over Load 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
    • Notebook PCs
    • Medical and Test Equipment
    • Portable Instrumentation

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The bq29312 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 bq29312 also integrates an I2C compatible interface to extract battery parameters such as cell voltages and control output status. Other parameters such as current protection thresholds and delays can be programmed into the bq29312 to increase the flexibility of the battery management system.

The bq29312 provides safety protection for overcharge, overload, short-circuit, overvoltage, and undervoltage conditions in conjunction with the battery management host. In overload and short-circuit conditions, the bq29312 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 bq29312. 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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Technical documentation

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Type Title Date
* Data sheet Three and Four Cell Lithium or Lithium-Polymer Battery Protection AFE datasheet (Rev. E) Mar. 02, 2005
Technical article How to stack battery monitors for high-cell-count industrial applications Feb. 11, 2021
Application note Comparing the bq29312A to the bq29312 Mar. 07, 2005
Application note Cell-Balancing in the bq208x Advanced Gas Gauge Solutions Mar. 17, 2004
Application note bq2083 and bq2085 Board Offset Characterization and Compensation Jan. 30, 2004

Design & development

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Software development

bq2084 Evaluation Software for Windows
EV2300-084 The Evaluation Software (EVSW) is a Windows application that works in conjunction with the bq2084 Evaluation Module (EVM). Also required, is the EV2300 USB interface board. This program provides a comprensive set of tools to allow easy evaluation of the bq2084 advanced gas gauge.
  • Runs on Windows XP/2000/98/ME
  • SBS registers may be selectively scanned and logged
  • Data Flash constants may be edited on screen and saved to a file
  • Calibration screen provides fast and accurate calibration

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