BQ28400 Netbook and Tablet Lithium ion gas gauge and protector |

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
Netbook and Tablet Lithium ion gas gauge and protector



The bq28400 device is a fully integrated gas gauge and analog monitoring management solution that provides protection and control for 2-series cell Li-Ion battery packs in a single TSSOP package.

Implementing the optimum balance of quick response analog hardware-based monitoring and control along with an integrated fast CPU provides the ideal pack-based or in-system Li-Ion battery solution. The bq28400 also provides flexible user programmable settings stored in flash memory for control of critical system parameters such as overcurrent, short circuit, under/overvoltage, and over/undertemperature conditions.

The bq28400 communicates with the system host via a two-wire SMBus 1.1 compatible interface, providing high-accuracy reporting and control of battery pack operation. The FET drive and TSSOP package enable a lower cost and small footprint solution along with a simple layout and routing on narrow pack PCBs.


  • Fully Integrated Gas Gauge and Analog Monitoring with Protection in a Single Package
  • 2-Series Cell Li-Ion or Li-Polymer Battery Packs
  • Flexible Memory Architecture with Integrated Flash Memory
  • Zero-Volt and Pre-Charge Mode
  • Full Array of Programmable Protection:
    • OV (Overvoltage)
    • UV (Undervoltage)
    • SC (Short Circuit)
    • OT (Overtemperature)
    • CIM (Cell Imbalance)
  • Accurate CEDV Gauging Algorithm with Self Discharge Compensation
  • High Accuracy Analog Interface with Two Independent ADCs:
    • High Resolution 16-Bit Integrator for Coulomb Counting
    • 16-Bit Delta-Sigma ADC with a 16-Channel Multiplexer for Voltage, Current, and Temperature
  • High Side Protection FET Drive
  • Fully Integrated Internal Clock Synthesizer with No External Components Required
  • Two-Wire SMBus v1.1 Compliant Communications
  • Reduced Power Modes (Typical Battery Pack Operating Range Conditions)
    • Low Power
    • Shutdown
  • 20-Pin TSSOP Package (RoHS-Compliant)
  • JEITA/Enhanced Charging
  • Supports SHA-1 Authentication Responder
    • Tablet PCs
    • Slate PCs
    • Netbooks/Notebooks
    • Smartbooks


Compare all products in Battery fuel gauges Email Download to Excel
Part number Order Number of series cells Cell chemistry Battery capacity (Max) (mAh) Communication interface Battery capacity (Min) (mAh) External capacity indication Implementation Gas gauge algorithm Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ28400 Order now 2-4 Cells     Li-Ion/Li-Polymer     32000     SMBus     500       Pack     CEDV       -40 to 85     TSSOP | 20     20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)    
BQ28550 Samples not available Single Cell     Li-Ion/Li-Polymer     6000     SMBus     300     None     Pack     CEDV     SHA-1 Authentication     -40 to 85     SON | 12     12SON: 10 mm2: 2.5 x 4 (SON | 12)