BQ2057C Status:ACTIVE

Low Dropout Linear 1-cell Li-Ion Charge Controller with AutoCompTM, 4.2V

      
         
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Datasheet

Download - PDF Icon
  • Advanced Linear Charge Mgmt IC for Single/Two-Cell Lithium-Ion & Lithium-Polymer (Rev. F) (bq2057c.pdf, 671 KB)
    25 Jul 2002 Download

 BQ2057 BQ2057CBQ2057T BQ2057W 
# Series Cells1  1  2  2  
Charge Current(Max)(A)>2  >2  >2  >2  
Charge Status Outputs1  1  1  1  
Control TopologyLinear  Linear  Linear  Linear  
Primary Charge Termination MethodMinimum Current  Minimum Current  Minimum Current  Minimum Current  
Pin/Package8MSOP,8SOIC,8TSSOP  8MSOP,8SOIC,8TSSOP  8SOIC,8TSSOP  8SOIC,8TSSOP  
Vin(Max)(V)18  18  18  18  
Battery Charge Voltage(V)4.1  4.2  8.2  8.4  
 SamplesSamplesSamplesSamples
 InventoryInventoryInventoryInventory

Customers Who Evaluated This Product Also Evaluated

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  • BQ24103: Standalone Synchronous Switch-mode Li-Ion Charger w/2A FET in QFN-20, 1- or 2-cell
  • TL431: Adjustable Precision Shunt Regulator
  • TPS767D301: Dual-Output Low-Dropout (LDO) Voltage Regulators
  • TPS51116: DDR1, DDR2, DDR3 Switcher and LDO

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Product Information

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 VCC Is Removed
  • EVMs Available for Quick Evaluation
  • Packaging: 8-Pin SOIC, 8-Pin TSSOP, 8-Pin MSOP

AutoComp is a trademark of Texas Instruments.

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.

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: 4.1 V, 4.2 V, 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.

    

Pricing / Packaging / CAD Design Tools / Samples

Price ($US)PackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price ($US) | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
BQ2057CDGKACTIVE-20 to 700.70 | 1kuMSOP (DGK) | 8 View 80 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ2057CDGKG4ACTIVE-20 to 700.70 | 1kuMSOP (DGK) | 8 View 80 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ2057CDGKRACTIVE-20 to 700.70 | 1kuMSOP (DGK) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
BQ2057CDGKRG4ACTIVE-20 to 700.70 | 1kuMSOP (DGK) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
BQ2057CSNACTIVE-20 to 700.70 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ2057CSNG4ACTIVE-20 to 700.70 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ2057CSNTRACTIVE-20 to 700.70 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
BQ2057CSNTRG4ACTIVE-20 to 700.70 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
BQ2057CTSACTIVE-20 to 700.70 | 1kuTSSOP (PW) | 8 View 150 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ2057CTSG4ACTIVE-20 to 700.70 | 1kuTSSOP (PW) | 8 View 150 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ2057CTSTRACTIVE-20 to 700.70 | 1kuTSSOP (PW) | 8 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
BQ2057CTSTRG4ACTIVE-20 to 700.70 | 1kuTSSOP (PW) | 8 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

  TI Inventory Status Reported Distributor Inventory
BQ2057CDGKAs of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 1200 | 23 Sep 6 Weeks AmericasDigiKey 400
 3690 | 25 Sep Rochester Electronics >1k
 >10k | 31 Oct AsiaWPI 73
BQ2057CDGKG4As of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 1200 | 23 Sep 6 Weeks AmericasAvnet 286
 3690 | 25 Sep Mouser Electronics 689
 >10k | 31 Oct     
BQ2057CDGKRAs of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 4643* >10k | 27 Oct 6 Weeks AmericasRochester Electronics >1k
BQ2057CDGKRG4As of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 4643* >10k | 27 Oct 6 Weeks None Reported
View Distributors
   
BQ2057CSNAs of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 5962 | 10 Oct 6 Weeks AmericasRochester Electronics 223
 >10k | 23 Oct AsiaWPI 89
  EuropeAbacus Polar 10
  Avnet-SILICA 75
  EBV Elektronik 150
  Farnell 583
BQ2057CSNG4As of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 5962 | 10 Oct 6 Weeks EuropeAbacus Polar 75
 >10k | 23 Oct     
BQ2057CSNTRAs of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 7311 | 9 Oct 6 Weeks AmericasRochester Electronics >1k
 >10k | 22 Oct AsiaWintech 745
BQ2057CSNTRG4As of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 7311 | 9 Oct 6 Weeks None Reported
View Distributors
   
 >10k | 22 Oct     
BQ2057CTSAs of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 150* >10k | 7 Nov 8 Weeks AmericasAvnet 125
  DigiKey 287
  Newark 317
  Rochester Electronics >1k
  AsiaWPI 189
BQ2057CTSG4As of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 150* >10k | 7 Nov 8 Weeks EuropeFarnell 330
BQ2057CTSTRAs of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* >10k | 31 Oct 6 Weeks AmericasArrow >1k
  Rochester Electronics >1k
BQ2057CTSTRG4As of 8:59 AM GMT, 07 Sep 2008As of 8:59 AM GMT, 07 Sep 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* >10k | 31 Oct 6 Weeks None Reported
View Distributors
   
View all Distributors  

* Our information is updated daily, so please check back with us soon if this does not meet your needs. You may also contact your TI Authorized Distributor , including those listed above, for real time stock information.

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

 Product ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
BQ2057CDGK RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ2057CDGKG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ2057CDGKR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ2057CDGKRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ2057CSN RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
BQ2057CSNG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
BQ2057CSNTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
BQ2057CSNTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
BQ2057CTS RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ2057CTSG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ2057CTSTR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ2057CTSTRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Datasheets

  • Advanced Linear Charge Mgmt IC for Single/Two-Cell Lithium-Ion & Lithium-Polymer (Rev. F) (bq2057c.pdf, 671 KB)
    25 Jul 2002 Download

Application Notes

View Application Notes for Battery Charge Management

User Guides

View User Guides for Battery Charge Management

Reference Designs

Description Part # Company
LDO, Buck/Boost, 2 Sync Buck, Sync Boost Reference Design PR038 Texas Instruments

Tools & Software

NamePart # Company Tool / Software Type
Temp Sense Designer SoftwareTEMPSENSE-SWTexas InstrumentsAnalysis Software
BQ2057C Evaluation Module for Li-Ion, linear (4.2V), one cellDV2057CTexas InstrumentsDevelopment Boards/EVMs

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