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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