Product details


Number of series cells (Min) 2 Vin (Max) (V) 28 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 110 Rating Catalog open-in-new Find other Battery monitors & balancers

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TSSOP (DBT) 30 34 mm² 7.8 x 4.4 open-in-new Find other Battery monitors & balancers


  • 2-Series, 3-Series, or 4-Series Cell Protection Control
  • Can Directly Interface with the bq803x-Based Gas Gauge Family
  • Watchdog and POR for the Host
  • Provides Individual Cell Voltages and Battery Voltage to
    Battery Management Host
  • Capable of Operation With 5-mΩ Sense Resistor Integrated
    Cell Balancing Drive
  • I2C Compatible User Interface Allows Access to
    Battery Information
  • Programmable Threshold and Delay for Overload Short Circuit
    in Discharge and Short Circuit in Charge
  • NMOS FET Drive for Charge and Discharge FETs
  • Host Control can Initiate Sleep and Ship Power Modes
  • Integrated 2.5-V, 16-mA LDO
  • Integrated 3.3-V, 25-mA LDO
  • Supply Voltage Range from 4.5 V to 28 V
  • Low Supply Current of 100 µA Typical
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The bq29330 is a 2-series, 3-series, and 4-series cell lithium-ion battery pack full-protection analog front end (AFE) IC that incorporates a 2.5-V, 16-mA and 3.3-V, 25-mA low dropout regulator (LDO). The bq29330 also integrates an I2C-compatible interface to extract battery parameters such as battery voltage, individual cell voltages, and control output status. Other parameters such as current protection thresholds and delays can also be programmed into the bq29330 to increase the flexibility of the battery management system.

The bq29330 provides safety protection for overload, short circuit in charge, and short circuit in discharge conditions and can also provide cell overvoltage, battery overvoltage and battery undervoltage protection with the battery management host. In overload, short circuit in charge and short circuit in discharge conditions, the bq29330 turns off the FET drive autonomously, depending on the internal configuration setting. The communications interface allows the host to observe and control the status of the bq29330, enable cell balancing, enter different power modes, set current protection levels, and set the blanking delay times.

Cell balancing of each cell can be performed via a cell bypass path integrated into the bq29330, which can be 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 (typ. 400 Ω).

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Technical documentation

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Type Title Date
* Data sheet 2, 3-, 4-Cell Lithium-Ion or Lithium-Polymer Battery Protection AFE datasheet (Rev. E) Mar. 19, 2012
User guide bq20z90EVM-001 SBS1.1 Impedance Track(TM) Technology (Rev. A) Oct. 04, 2013
Application note Fast Cell Balancing Using External MOSFET (Rev. A) Jan. 26, 2009
User guide bq20z70-V160 + bq29330, bq20z75 TRM May 23, 2008
Application note bq29330 External Short Circuit Protection Aug. 22, 2007

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