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BQ2057CBQN/a194avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CDGKTIN/a498avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CDGKG4TEXASN/a5082avaiLow Dropout Linear 1-cell Li-Ion Charge Controller with AutoCompTM, 4.2V 8-VSSOP -20 to 70
BQ2057CDGKRTIN/a13073avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CDGKRG4TI/BBN/a480avaiLow Dropout Linear 1-cell Li-Ion Charge Controller with AutoCompTM, 4.2V 8-VSSOP -20 to 70
BQ2057CSNTI&BBN/a1avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CSNG4TIN/a1197avaiLow Dropout Linear 1-cell Li-Ion Charge Controller with AutoCompTM, 4.2V 8-SOIC -20 to 70
BQ2057CSNG4TEXASN/a1530avaiLow Dropout Linear 1-cell Li-Ion Charge Controller with AutoCompTM, 4.2V 8-SOIC -20 to 70
BQ2057CSNTRTIN/a1430avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CSNTRG4TI/BBN/a231avaiLow Dropout Linear 1-cell Li-Ion Charge Controller with AutoCompTM, 4.2V 8-SOIC -20 to 70
BQ2057CTSTI,TIN/a5avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CTSG4TEXASN/a2187avaiLow Dropout Linear 1-cell Li-Ion Charge Controller with AutoCompTM, 4.2V 8-TSSOP -20 to 70
BQ2057CTSTRUNITRODEN/a1218avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CTSTRTI Pb-freeN/a1478avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CTSTRTI ?N/a522avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CTSTRTI/BBN/a114avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CTSTRTIN/a28879avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CTS-TR |BQ2057CTSTRTIN/a533avaiLi-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
BQ2057CTSTRG4TIN/a576avaiLow Dropout Linear 1-cell Li-Ion Charge Controller with AutoCompTM, 4.2V 8-TSSOP -20 to 70


BQ2057CTSTR ,Li-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM    SLUS025F − MAY 2001 − REVISED JULY 2002Terminal FunctionsTERMINALNO. ..
BQ2057CTSTR ,Li-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM    SLUS025F − MAY 2001 − REVISED JULY 2002function
BQ2057CTSTR ,Li-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTMFEATURESDESCRIPTION Ideal for Single (4.1 V or 4.2 V) and Dual-CellThe BENCHMARQ bq2057 series adv ..
BQ2057CTSTR ,Li-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM   SLUS025F − MAY 2001 − REVISED JULY 2002         ..
BQ2057CTSTR ,Li-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTMFEATURESDESCRIPTION Ideal for Single (4.1 V or 4.2 V) and Dual-CellThe BENCHMARQ bq2057 series adv ..
BQ2057CTS-TR ,Li-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM    SLUS025F − MAY 2001 − REVISED JULY 2002Terminal FunctionsTERMINALNO. ..
BUK100-50GS ,PowerMOS transistor TOPFET
BUK100-50GS ,PowerMOS transistor TOPFET
BUK101-50DL ,PowerMOS transistor Logic level TOPFET
BUK101-50DL ,PowerMOS transistor Logic level TOPFET
BUK102-50DL ,PowerMOS transistor Logic level TOPFET
BUK104-50L ,PowerMOS transistor Logic level TOPFET


BQ2057C-BQ2057CDGK-BQ2057CDGKG4-BQ2057CDGKR-BQ2057CDGKRG4-BQ2057CSN-BQ2057CSNG4-BQ2057CSNTR-BQ2057CSNTRG4-BQ2057CTS-BQ2057CTSG4-BQ2057CTSTR-BQ2057CTS-TR-BQ2057CTSTRG4
Li-Ion Low-Dropout Linear (4.2V) Charge Management IC For One-Cell Applications With AutoCompTM
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SLUS025F − MAY 2001 − REVISED JULY 2002
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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 High-
or 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 VCCIs 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 cost-
sensitive 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 pass-
element 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.
COMP
VSS
STAT
SNS
BAT
VCC
bq2057xSN or bq2057xTS
SOIC (SN) or TSSOP (TS) PACKAGE
(TOP VIEW)

BAT
SNS
COMP
VCC
STAT
VSS
bq2057xDGK
MSOP (DGK) PACKAGE
(TOP VIEW)

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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