{"id":5805,"date":"2026-06-11T05:30:33","date_gmt":"2026-06-11T05:30:33","guid":{"rendered":"https:\/\/materialparts.com\/bq2057wtstr\/"},"modified":"2026-06-11T06:59:25","modified_gmt":"2026-06-11T06:59:25","slug":"bq2057wtstr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/bq2057wtstr\/","title":{"rendered":"BQ2057WTSTR"},"content":{"rendered":"

Productos<\/h2>\n

The BQ2057WTSTR from TI is a 2-cell Li-ion linear battery charger with 2A charge current, preconditioning, and charge status in TSSOP-20 for battery pack charging.<\/p>\n

Especificaciones<\/h2>\n\n\n
Paquete<\/td>\nTSSOP-20 (6.5×4.4mm)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • See datasheet for complete specifications<\/li>\n
  • Industry-standard package<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Industrial control<\/li>\n
    • Consumer electronics<\/li>\n
    • Communication equipment<\/li>\n
    • Power management<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The BQ2057WTSTR from TI is a 2-cell Li-ion linear battery charger with 2A charge current, preconditioning, and charge status in TSSOP-20 for battery pack charging. Key Specifications Package TSSOP-20 (6.5×4.4mm) Features See datasheet for complete specifications Industry-standard package Applications Industrial control Consumer electronics Communication equipment Power management<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,29],"tags":[],"chip_brand":[138],"class_list":["post-5805","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-power-management-ics-pmic","chip_brand-ti"],"acf":{"brief_explanation":"Li-ion linear charger, 2-cell, 2A, TSSOP-20","date_code":"","package_case":"TSSOP-20 (6.5x4.4mm)","in_stock":12445,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/bq2057w.pdf","price":"$1.50 @ 1ku","product_introduction":"The BQ2057WTSTR from TI is a 2-cell Li-ion linear battery charger with 2A charge current, preconditioning, and charge status in TSSOP-20 for battery pack charging.","working_principle":"The BQ2057WTSTR is a 2-cell Li-Ion\/Li-Polymer linear battery charger from TI in TSSOP-20. It implements a CC-CV (Constant Current-Constant Voltage) charging algorithm: the CC phase delivers constant current (set by external sense resistor on SNS pin) until the battery reaches the regulation voltage (8.2V or 8.4V for 2-cell), then the CV phase holds this voltage while current tapers. The CC pin drives the base of an external PNP pass transistor; the BQ2057 modulates the PNP base current to regulate charge current. The SNS pin monitors voltage across an external sense resistor (typically 0.1-0.25 Ohm) to measure charge current: Ichg = 0.1V \/ Rsns. The TS pin interfaces with a 10k NTC thermistor on the battery pack for temperature qualification: charging is suspended if battery temperature is outside the 0-45C window. The STAT pin provides charge status indication: HIGH during charge, LOW when complete, and blinking during fault. Charge termination occurs when current drops below the programmable threshold (typically C\/10).","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>VCC<\/td>Power<\/td>Supply input (4.5-18V)<\/td><\/tr>
      2<\/td>TS<\/td>Input<\/td>Temperature sense (NTC thermistor input)<\/td><\/tr>
      3<\/td>STAT<\/td>Output<\/td>Charge status output (LED driver)<\/td><\/tr>
      4<\/td>VSS<\/td>Power<\/td>Ground<\/td><\/tr>
      5<\/td>CC<\/td>Output<\/td>Charge control output (drives external PNP base)<\/td><\/tr>
      6<\/td>COMP<\/td>I\/O<\/td>Compensation capacitor for charge loop<\/td><\/tr>
      7<\/td>SNS<\/td>Input<\/td>Current sense input (from sense resistor)<\/td><\/tr>
      8<\/td>BAT<\/td>Input<\/td>Battery voltage sense input<\/td><\/tr><\/table>","application_scenarios":"
    • Industrial control<\/li>
    • Consumer electronics<\/li>
    • Communication equipment<\/li>
    • Power management<\/li>","alternative_models":"
      Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
      Texas Instruments<\/td>BQ2057WTSSTR<\/td>TSSOP-20<\/td>Same device, different package code<\/td><\/tr>
      Texas Instruments<\/td>BQ2057CSN<\/td>SOIC-8<\/td>Single-cell version, 4.1V\/4.2V<\/td><\/tr>
      Microchip<\/td>MCP73871-2CCI\/ML<\/td>QFN-20<\/td>2-cell Li-Ion charger, 1A<\/td><\/tr>
      Maxim<\/td>MAX1737EEI+<\/td>QSOP-28<\/td>2-cell Li+ charger, switch-mode<\/td><\/tr>
      Analog Devices<\/td>LTC4006EUH#PBF<\/td>QFN-24<\/td>2-cell Li-Ion, switch-mode charger<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/5805","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=5805"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/5805\/revisions"}],"predecessor-version":[{"id":5955,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/5805\/revisions\/5955"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=5805"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=5805"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=5805"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=5805"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}