BQ2057WTSTR

FEATURES

Ideal for Single (4.1 V or 4.2 V) and Dual-Cell

(8.2 V or 8.4 V) Li-Ion or Li-Pol Packs

Requires Small Number of External

Components

0.3 V Dropout Voltage for Minimizing Heat

Dissipation

Better Than ±1% Voltage Regulation Accuracy

With Preset Voltages

AutoComp Dynamic Compensation of

Battery Pack’s Internal Impedance to Reduce

Charge Time

Optional Cell-Temperature Monitoring Before

and During Charge

Integrated Voltage and Current Regulation

With Programmable Charge-Current and Highor Low-Side Current Sensing

Integrated Cell Conditioning for Reviving

Deeply Discharged Cells and Minimizing Heat

Dissipation During Initial Stage Of Charge

Charge Status Output for Single or Dual Led

or Host Processor Interface

Automatic Battery-Recharge Feature

Charge Termination by Minimum Current

Automatic Low-Power Sleep Mode When VCC

Is Removed

EVMs Available for Quick Evaluation

Packaging: 8-Pin SOIC, 8-Pin TSSOP, 8-Pin

MSOP

DESCRIPTION

The BENCHMARQ bq2057 series advanced

Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Pol) linear

charge-management ICs are designed for costsensitive and compact portable electronics. They

combine high-accuracy current and voltage regulation,

battery conditioning, temperature monitoring, charge

termination, charge-status indication, and AutoComp

charge-rate compensation in a single 8-pin IC. MSOP,

TSSOP, and SOIC package options are offered to fit a

wide range of end applications.

The bq2057 continuously measures battery

temperature using an external thermistor. For safety,

the bq2057 inhibits charge until the battery temperature

is within user-defined thresholds. The bq2057 then

charges the battery in three phases: conditioning,

constant current, and constant voltage. If the battery

voltage is below the low-voltage threshold, V(min), the

bq2057 precharges using a low current to condition the

battery. The conditioning charge rate is approximately

10% of the regulation current. The conditioning current

also minimizes heat dissipation in the external passelement during the initial stage of the charge. After

conditioning, the bq2057 applies a constant current to

the battery. An external sense-resistor sets the current.

The sense-resistor can be on either the high or low side

of the battery without additional components. The

constant-current phase continues until the battery

reaches the charge-regulation voltage.

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