C0098C0113C0050C0048C0053C0055C0044 C0098C0113C0050C0048C0053C0055C0067
C0098C0113C0050C0048C0053C0055C0084C0044 C0098C0113C0050C0048C0053C0055C0087
SLUS025F − MAY 2001 − REVISED JULY 2002
C0065C0068C0086C0065C0078C0067C0069C0068 C0076C0073C0078C0069C0065C0082 C0067C0072C0065C0082C0071C0069 C0077C0065C0078C0065C0071C0069C0077C0069C0078C0084 C0073C0067
C0070C0079C0082 C0083C0073C0078C0071C0076C0069C0262 C0065C0078C0068 C0084C0087C0079C0262C0067C0069C0076C0076 C0076C0073C0084C0072C0073C0085C0077C0262C0073C0079C0078 C0065C0078C0068 C0076C0073C0084C0072C0073C0085C0077C0262C0080C0079C0076C0089C0077C0069C0082
1
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FEATURES
C0068 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
C0068 Requires Small Number of External
Components
C0068 0.3 V Dropout Voltage for Minimizing Heat
Dissipation
C0068 Better Than ±1% Voltage Regulation Accuracy
With Preset Voltages
C0068 AutoCompC0116 Dynamic Compensation of
Battery Pack’s Internal Impedance to Reduce
Charge Time
C0068 Optional Cell-Temperature Monitoring Before
and During Charge
C0068 Integrated Voltage and Current Regulation
With Programmable Charge-Current and High-
or Low-Side Current Sensing
C0068 Integrated Cell Conditioning for Reviving
Deeply Discharged Cells and Minimizing Heat
Dissipation During Initial Stage Of Charge
C0068 Charge Status Output for Single or Dual Led
or Host Processor Interface
C0068 Automatic Battery-Recharge Feature
C0068 Charge Termination by Minimum Current
C0068 Automatic Low-Power Sleep Mode When V
CC
Is Removed
C0068 EVMs Available for Quick Evaluation
C0068 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
CC
VSS
STAT
8
7
6
5
1
2
3
4
SNS
BAT
VCC
TS
bq2057xSN or bq2057xTS
SOIC (SN) or TSSOP (TS) PACKAGE
(TOP VIEW)
BAT
SNS
COMP
CC
8
7
6
5
1
2
3
4
VCC
TS
STAT
VSS
bq2057xDGK
MSOP (DGK) PACKAGE
(TOP VIEW)
C0080C0082C0079C0068C0085C0067C0084C0073C0079C0078 C0068C0065C0084C0065 C0105C0110C0102C0111C0114C0109C0097C0116C0105C0111C0110 C0105C0115 C0099C0117C0114C0114C0101C0110C0116 C0097C0115 C0111C0102 C0112C0117C0098C0108C0105C0099C0097C0116C0105C0111C0110 C0100C0097C0116C0101C0046
C0080C0114C0111C0100C0117C0099C0116C0115 C0099C0111C0110C0102C0111C0114C0109 C0116C0111 C0115C0112C0101C0099C0105C0102C0105C0099C0097C0116C0105C0111C0110C0115 C0112C0101C0114 C0116C0104C0101 C0116C0101C0114C0109C0115 C0111C0102 C0084C0101C0120C0097C0115 C0073C0110C0115C0116C0114C0117C0109C0101C0110C0116C0115
C0115C0116C0097C0110C0100C0097C0114C0100 C0119C0097C0114C0114C0097C0110C0116C0121C0046 C0080C0114C0111C0100C0117C0099C0116C0105C0111C0110 C0112C0114C0111C0099C0101C0115C0115C0105C0110C0103 C0100C0111C0101C0115 C0110C0111C0116 C0110C0101C0099C0101C0115C0115C0097C0114C0105C0108C0121 C0105C0110C0099C0108C0117C0100C0101
C0116C0101C0115C0116C0105C0110C0103 C0111C0102 C0097C0108C0108 C0112C0097C0114C0097C0109C0101C0116C0101C0114C0115C0046
AutoComp is a trademark of Texas Instruments.
Copyright  2002, Texas Instruments Incorporated
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.