Details, datasheet, quote on part number: BQ2057W
CategoryPower Management => Battery Management => Battery Chargers
DescriptionLi-ion Low-dropout Linear (4.1v) ic For One-cell Applications With Autocomptm
CompanyInternational Components Corp.
DatasheetDownload BQ2057W datasheet
Cross ref.Similar parts: LTC692CS8, LTC692IS8, LTC692CS8#PBF, LTC692CS8#TRPBF, LTC692IS8#PBF, LTC692IS8#TRPBF, LTC1731CS8-4.1, LTC1731CS8-4.2, LTC1731CS8-8.2, LTC1731CS8-8.4
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Features, Applications


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 AutoCompt 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 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


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.

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. AutoComp is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

The bq2057 then begins the constant-voltage phase. The accuracy of the voltage regulation is better than ±1% over the operating-temperature and supply-voltage ranges. For single and dual cells, the bq2057 is offered in four fixed-voltage versions: 8.2 V, and 8.4 V. Charge stops when the current tapers to the charge termination threshold, I(TERM). The bq2057 automatically restarts the charge if the battery voltage falls below the V(RCH) threshold. The designer also may use the AutoComp feature to reduce charging time. This proprietary technique allows safe and dynamic compensation for the internal impedance of the battery pack during charge.

AVAILABLE OPTIONS PACKAGE TA CHARGE REGULATION VOLTAGE 8.4 V Note the difference in pinout for this package. SOIC (SN) bq2057TSN bq2057WSN TSSOP (TS) bq2057TTS bq2057WTS Not available MSOP (DGK) bq2057DGK bq2057CDGK

TS1 Trip I-Control 0.5 VCC SNS VCC­V(SNS) VSS­V(SNS) + _ Charge Termination Current Regulation High/Low SNS Set


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