1FEATURES
• 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

DESCRIPTION
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.