{"id":7071,"date":"2026-06-23T03:22:31","date_gmt":"2026-06-23T03:22:31","guid":{"rendered":"https:\/\/materialparts.com\/bq2057wsn\/"},"modified":"2026-06-23T03:22:31","modified_gmt":"2026-06-23T03:22:31","slug":"bq2057wsn","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/bq2057wsn\/","title":{"rendered":"BQ2057WSN"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The BQ2057WSN from Texas Instruments is an advanced linear charge management IC for 2-cell Li-Ion and Li-Polymer batteries, providing 8.4V regulation with better than +\/-1% accuracy. Featuring low dropout voltage (0.3V), AutoComp dynamic impedance compensation, and integrated temperature monitoring, it simplifies charger design for portable and embedded applications.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Battery Chemistry<\/td>\nLi-Ion \/ Li-Polymer<\/td>\n<\/tr>\n
Cell Count<\/td>\n2 cells (8.4V)<\/td>\n<\/tr>\n
Regulation Voltage<\/td>\n8.4V (+\/-1%)<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n0.3V (typical)<\/td>\n<\/tr>\n
Charge Mode<\/td>\nLinear<\/td>\n<\/tr>\n
Current Sensing<\/td>\nHigh-side or low-side programmable<\/td>\n<\/tr>\n
AutoComp<\/td>\nYes (dynamic battery impedance compensation)<\/td>\n<\/tr>\n
Temperature Monitor<\/td>\nOptional (thermistor input)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-20C to +70C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Precision 8.4V regulation voltage with +\/-1% accuracy for 2-cell Li-Ion\/Li-Polymer<\/li>\n
  • Low 0.3V dropout voltage minimizes power dissipation in linear charger<\/li>\n
  • AutoComp dynamically compensates battery pack internal impedance for faster charging<\/li>\n
  • Integrated conditioning, constant-current, and constant-voltage charge phases<\/li>\n
  • Optional battery temperature monitoring via thermistor input<\/li>\n
  • Three-state charge status output (charging, complete, temperature fault\/sleep)<\/li>\n
  • Automatic recharge when battery voltage drops below threshold<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Portable medical equipment battery chargers<\/li>\n
    • Emergency call and telematics systems<\/li>\n
    • Handheld instruments and data terminals<\/li>\n
    • Aftermarket battery charging accessories<\/li>\n
    • Gaming and computer accessories<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The BQ2057WSN from Texas Instruments is an advanced linear charge management IC for 2-cell Li-Ion and Li-Polymer batteries, providing 8.4V regulation with better than +\/-1% accuracy. Featuring low dropout voltage (0.3V), AutoComp dynamic impedance compensation, and integrated temperature monitoring, it simplifies charger design for portable and embedded applications. Key Specifications Battery Chemistry Li-Ion […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,29],"tags":[],"chip_brand":[138],"class_list":["post-7071","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-power-management-ics-pmic","chip_brand-ti"],"acf":{"brief_explanation":"2-cell Li-Ion charger IC, 8.4V, +\/-1%, 0.3V dropout, AutoComp, SOIC-8, -20 to +70C","date_code":"","package_case":"SOIC-8 (4.90 x 3.91 x 1.58 mm)","in_stock":3500,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/bq2057c.pdf","price":"$1.45 @ 1ku","product_introduction":"The BQ2057WSN from Texas Instruments is an advanced linear charge management IC for 2-cell Li-Ion and Li-Polymer battery packs, regulating to 8.4V with better than +\/-1% accuracy. The low 0.3V dropout voltage minimizes power dissipation in the series pass element, simplifying thermal design. The proprietary AutoComp feature dynamically compensates for battery pack internal impedance, reducing charge time compared to conventional chargers. The device integrates three charge phases: conditioning for deeply discharged cells, constant-current fast charge, and constant-voltage taper charge with minimum current termination. Optional thermistor input enables battery temperature monitoring during charging. The three-state status output drives an LED or communicates with a host processor.","working_principle":"The BQ2057WSN implements a complete linear charging algorithm for 2-cell Li-Ion\/Li-Polymer batteries. (1) Conditioning Phase: When a deeply discharged battery (below Vmin) is detected, the charger applies a low conditioning current (typically 1\/10 of fast charge current) to safely raise the cell voltage. (2) Constant-Current Phase: Once the battery voltage rises above Vmin, the charger switches to constant-current fast charge at the programmed current level, set by an external sense resistor. (3) Constant-Voltage Phase: When the battery reaches 8.4V, the charger transitions to constant-voltage regulation, tapering the current as the battery approaches full charge. (4) Termination: Charging terminates when the current drops below the minimum current threshold. (5) AutoComp: During the constant-voltage phase, AutoComp dynamically adds a small voltage offset to compensate for the voltage drop across the battery pack internal impedance, effectively increasing the actual charge delivered. (6) Recharge: After termination, the device monitors battery voltage and automatically restarts charging when voltage drops below the recharge threshold.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>TS<\/td>Input<\/td>Temperature sense input (thermistor)<\/td><\/tr>
      2<\/td>VCC<\/td>Power<\/td>Supply voltage input<\/td><\/tr>
      3<\/td>SNS<\/td>Input<\/td>Current sense input<\/td><\/tr>
      4<\/td>CC<\/td>Output<\/td>Charge control output (drives external PNP\/FET)<\/td><\/tr>
      5<\/td>COMP<\/td>Output<\/td>AutoComp output (compensation capacitor)<\/td><\/tr>
      6<\/td>BAT<\/td>Input<\/td>Battery voltage sense input<\/td><\/tr>
      7<\/td>STAT<\/td>Output<\/td>Charge status output (3-state: high\/low\/hi-Z)<\/td><\/tr>
      8<\/td>VSS<\/td>Ground<\/td>Ground reference<\/td><\/tr><\/table>","application_scenarios":"
      • Portable medical equipment 2-cell Li-Ion battery chargers with temperature monitoring<\/li>
      • Emergency call and telematics systems with automatic recharge capability<\/li>
      • Handheld instruments and data terminals with AutoComp faster charging<\/li>
      • Aftermarket battery charging accessories with low dropout linear design<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>BQ2057CDSG<\/td>MSOP-8<\/td>Single-cell 4.2V version<\/td><\/tr>
        TI<\/td>BQ2057TSN<\/td>SOIC-8<\/td>Single-cell 4.1V version<\/td><\/tr>
        Microchip<\/td>MCP73844<\/td>SOIC-8<\/td>2-cell Li-Ion charger<\/td><\/tr>
        Analog Devices<\/td>LTC4002-8.4<\/td>MSOP-10<\/td>2-cell linear charger<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7071","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=7071"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7071\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7071"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7071"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7071"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7071"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}