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Product InformationFeatures
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. |
| Price ($US) | Packaging | CAD Design Tools | Samples | ||||||
| Device | Status | Temp (oC) | Price ($US) | Quantity | Package | Pins | Top Side Marking | Package QTY | Package Carrier | Symbols | Footprints | Samples |
| BQ2057WSN | ACTIVE | -20 to 70 | 0.80 | 1ku | SOIC (D) | 8 | View | 75 | TUBE | |||
| BQ2057WSNG4 | ACTIVE | -20 to 70 | 0.80 | 1ku | SOIC (D) | 8 | View | 75 | TUBE | |||
| BQ2057WSNTR | ACTIVE | -20 to 70 | 0.80 | 1ku | SOIC (D) | 8 | View | 2500 | LARGE T&R | Purchase Samples | ||
| BQ2057WSNTRG4 | ACTIVE | -20 to 70 | 0.80 | 1ku | SOIC (D) | 8 | View | 2500 | LARGE T&R | Purchase Samples | ||
| BQ2057WTS | ACTIVE | -20 to 70 | 0.80 | 1ku | TSSOP (PW) | 8 | View | 150 | TUBE | |||
| BQ2057WTSG4 | ACTIVE | -20 to 70 | 0.80 | 1ku | TSSOP (PW) | 8 | View | 150 | TUBE | |||
| BQ2057WTSTR | ACTIVE | -20 to 70 | 0.80 | 1ku | TSSOP (PW) | 8 | View | 2000 | LARGE T&R | Purchase Samples | ||
| BQ2057WTSTRG4 | ACTIVE | -20 to 70 | 0.80 | 1ku | TSSOP (PW) | 8 | View | 2000 | LARGE T&R | Purchase 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.
| TI Inventory Status | Reported Distributor Inventory | |||||||
| BQ2057WSN | As of 9:04 AM GMT, 29 Aug 2008 | As of 9:04 AM GMT, 29 Aug 2008 | ||||||
| In Stock | In Progress QTY | Date | Lead Time | Region | Company | In Stock | Purchase | ||
| 3000* | >10k | 3 Oct | 6 Weeks | Americas | Arrow | 175 | |||
| Avnet | 450 | |||||||
| DigiKey | >1k | |||||||
| Mouser Electronics | 375 | |||||||
| Newark | 265 | |||||||
| Rochester Electronics | >1k | |||||||
| Europe | Farnell | 432 | ||||||
| Spoerle | 150 | |||||||
| BQ2057WSNG4 | As of 9:04 AM GMT, 29 Aug 2008 | As of 9:04 AM GMT, 29 Aug 2008 | ||||||
| In Stock | In Progress QTY | Date | Lead Time | Region | Company | In Stock | Purchase | ||
| 3000* | >10k | 3 Oct | 6 Weeks | None Reported View Distributors | |||||
| BQ2057WSNTR | As of 9:04 AM GMT, 29 Aug 2008 | As of 9:04 AM GMT, 29 Aug 2008 | ||||||
| In Stock | In Progress QTY | Date | Lead Time | Region | Company | In Stock | Purchase | ||
| 0* | >10k | 2 Oct | 6 Weeks | Americas | Rochester Electronics | >1k | |||
| BQ2057WSNTRG4 | As of 9:04 AM GMT, 29 Aug 2008 | As of 9:04 AM GMT, 29 Aug 2008 | ||||||
| In Stock | In Progress QTY | Date | Lead Time | Region | Company | In Stock | Purchase | ||
| 0* | >10k | 2 Oct | 6 Weeks | None Reported View Distributors | |||||
| BQ2057WTS | As of 9:04 AM GMT, 29 Aug 2008 | As of 9:04 AM GMT, 29 Aug 2008 | ||||||
| In Stock | In Progress QTY | Date | Lead Time | Region | Company | In Stock | Purchase | ||
| 4900* | >10k | 19 Dec | 6 Weeks | Americas | DigiKey | 107 | |||
| Asia | WPI | 120 | ||||||
| Europe | Arrow Northern Europe | 300 | ||||||
| Spoerle | 300 | |||||||
| BQ2057WTSG4 | As of 9:04 AM GMT, 29 Aug 2008 | As of 9:04 AM GMT, 29 Aug 2008 | ||||||
| In Stock | In Progress QTY | Date | Lead Time | Region | Company | In Stock | Purchase | ||
| 4900* | >10k | 19 Dec | 6 Weeks | Americas | Mouser Electronics | 346 | |||
| Europe | Farnell | 261 | ||||||
| BQ2057WTSTR | As of 9:04 AM GMT, 29 Aug 2008 | As of 9:04 AM GMT, 29 Aug 2008 | ||||||
| In Stock | In Progress QTY | Date | Lead Time | Region | Company | In Stock | Purchase | ||
| 0* | >10k | 6 Oct | 6 Weeks | Americas | Rochester Electronics | >1k | |||
| BQ2057WTSTRG4 | As of 9:04 AM GMT, 29 Aug 2008 | As of 9:04 AM GMT, 29 Aug 2008 | ||||||
| In Stock | In Progress QTY | Date | Lead Time | Region | Company | In Stock | Purchase | ||
| 0* | >10k | 6 Oct | 6 Weeks | None Reported View 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.
| Product Content | DPPM / MTBF / FIT Rate | ||||
| Device | Eco Plan* | Lead / Ball Finish | MSL Rating / Peak Reflow | Details | Details |
| BQ2057WSN | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | View | View |
| BQ2057WSNG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | View | View |
| BQ2057WSNTR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | View | View |
| BQ2057WSNTRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | View | View |
| BQ2057WTS | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | View | View |
| BQ2057WTSG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | View | View |
| BQ2057WTSTR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | View | View |
| BQ2057WTSTRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | View | View |
* 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.
View Application Notes for Battery Charge Management
| Description | Part # | Company |
| LDO, Buck/Boost, 2 Sync Buck, Sync Boost Reference Design | PR038 | Texas Instruments |
| Name | Part # | Company | Tool / Software Type |
| Temp Sense Designer Software | TEMPSENSE-SW | Texas Instruments | Analysis Software |
| BQ2057W Evaluation Module for Li-Ion, linear (8.4V), two cells | DV2057W | Texas Instruments | Development Boards/EVMs |
| Alternative Products - Are similar to BQ2057W | |||
| Customers Who Evaluated This Product Also Evaluated... | |||
| Part # | Name | Comments | |
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| BQ2057C | Low Dropout Linear 1-cell Li-Ion Charge Controller with AutoCompTM, 4.2V | TI customers also evaluated this product. | |
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