Texas Instruments bq2057c Data Sheet / Manual

查询BQ2057供应商

SLUS025F − MAY 2001 − REVISED JULY 2002

FEATURES

DESCRIPTION

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

The BENCHMARQ bq2057 series advanced

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

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

Requires Small Number of External

charge-management ICs are designed for cost-

Components

sensitive and compact portable electronics. They

0.3 V Dropout Voltage for Minimizing Heat

combine high-accuracy current and voltage regulation,

Dissipation

battery conditioning, temperature monitoring, charge

Better Than ±1% Voltage Regulation Accuracy termination, charge-status indication, and Auto Comp With Preset Voltages charge-rate compensation in a single 8-pin IC. MSOP,

TSSOP, and SOIC package options are offered to fit a

Auto Comp Dynamic Compensation of

wide range of end applications.

Battery Pack’s Internal Impedance to Reduce Charge Time

The bq2057 continuously measures battery

Optional Cell-Temperature Monitoring Before temperature using an external thermistor. For safety, and During Charge the bq2057 inhibits charge until the battery temperature

is within user-defined thresholds. The bq2057 then

Integrated Voltage and Current Regulation

charges the battery in three phases: conditioning,

With Programmable Charge-Current and High-

constant current, and constant voltage. If the battery

or Low-Side Current Sensing

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

Integrated Cell Conditioning for Reviving

bq2057 precharges using a low current to condition the

Deeply Discharged Cells and Minimizing Heat

battery. The conditioning charge rate is approximately

Dissipation During Initial Stage Of Charge

10% of the regulation current. The conditioning current

Charge Status Output for Single or Dual Led

also minimizes heat dissipation in the external pass-

or Host Processor Interface

element during the initial stage of the charge. After

Automatic Battery-Recharge Feature conditioning, the bq2057 applies a constant current to

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

Charge Termination by Minimum Current

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

Automatic Low-Power Sleep Mode When VCC

of the battery without additional components. The

Is Removed

constant-current phase continues until the battery

EVMs Available for Quick Evaluation

reaches the charge-regulation voltage.

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

bq2057x SN or bq2057x TS

bq2057x DGK

SOIC (SN) or TSSOP (TS) PACKAGE

MSOP (DGK) PACKAGE

(TOP VIEW)

(TOP VIEW)

SNS COMP VCC BAT BAT CC TS SNS VCC VSS STAT COMP TS STAT VSS CC

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.

Auto Comp is a trademark of Texas Instruments. !"#$%! & '("")% $& ! *(
+'$%! ,$%)- Copyright  2002, Texas Instruments Incorporated "!,('%& '!!"# %! &*)''$%!& *)" %.) %)"#& ! )/$& &%"(#)%& &%$,$", 0$""$%1- "!,('%! *"!')&&2 ,!)& !% )')&&$"+1 '+(,) %)&%2 ! $++ *$"$#)%)"&-

1www.ti.com