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.