BQ28400

• 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
• APPLICATIONS
  • Tablet PCs
  • Slate PCs
  • Netbooks/Notebooks
  • Smartbooks

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.