BQ29312 Two, Three and Four Cell Lithium or Lithium-Polymer Battery Protection AFE | TI.com

BQ29312
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
Two, Three and Four Cell Lithium or Lithium-Polymer Battery Protection AFE

 

Recommended alternative parts

  • BQ76920  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 
  • BQ76925  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 

No design support from TI available

This product does not have ongoing design support from TI for new projects, such as new content or software updates. If available, you will find relevant collateral, software and tools in the product folder. You can also search for archived information in the  TI E2ETM support forums.

Description

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 ).

Features

  • 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
  • APPLICATIONS
    • Notebook PCs
    • Medical and Test Equipment
    • Portable Instrumentation

Parametrics

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Part number Order Vin (Max) (V) Number of series cells (Min) Number of series cells (Max) Operating temperature range (C) Rating Package Group Package size: mm2:W x L (PKG)
BQ29312 Order now 25     2     4     -25 to 85     Catalog     TSSOP | 24     24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24)