{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BQ2057CTSTR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"BQ2057CTSTR","canonicalUrl":"https://icboms.com/texas-instruments/BQ2057CTSTR","factsUrl":"https://icboms.com/api/mcp/products/BQ2057CTSTR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments BQ2057CTSTR, single-cell Lithium Ion/Polymer linear charger IC, programmable constant-current up to 15V supply, 4.2V battery termination voltage, 8-TSSOP package.","salesMarkdown":"## Single-cell linear charger for portable builds The Texas Instruments BQ2057CTSTR is a linear charge-management IC designed for single-cell Lithium Ion or Lithium Polymer battery packs. It terminates at the standard 4.2V full-charge voltage and uses a constant-current, programmable charge profile — you set the charge current with a single external resistor, no serial bus or firmware involved. The input supply can go up to 15V, which gives headroom for unregulated wall adapters or 5V USB inputs with margin. ## Setting the charge current — one resistor, no code The 'Constant - Programmable' current feature means the charge rate is set by a resistor from the PROG pin to ground. No I2C, no firmware, no configuration register — just pick the resistor value for your battery capacity and charge time. This makes the BQ2057CTSTR a straightforward drop-in for a hardware-only charger block. Because it is a linear charger, the pass element dissipates the voltage drop between input and battery as heat. For a 5V input charging a 3.7V nominal cell at 500 mA, that is about 0.65W — the 8-TSSOP package on a reasonable copper area handles it, but keep the thermal path in mind during layout. Mounting type is Surface Mount, so no through-hole equivalent exists in this series. The base product number is BQ2057, meaning other package variants (e.g., SOIC) share the same die but require a different PCB footprint.","metaTitle":"BQ2057CTSTR Li-Ion/Polymer Charger IC, 8-TSSOP","metaDescription":"Texas Instruments BQ2057CTSTR single-cell Li-Ion/Polymer charger IC. Programmable constant current, 4.2V termination, 8-TSSOP. Active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Interface":"-","Mounting Type":"Surface Mount","Package / Case":"8-TSSOP (0.173\\\", 4.40mm Width)","Product Status":"Active","Number of Cells":"1","lifecycle_stage":"eol_hot","Fault Protection":"-","Battery Chemistry":"Lithium Ion/Polymer","Current - Charging":"Constant - Programmable","Base Product Number":"BQ2057","Battery Pack Voltage":"4.2V","Charge Current - Max":"-","Operating Temperature":"-20°C~70°C(TA)","Programmable Features":"Current","Voltage - Supply (Max)":"15V","Supplier Device Package":"8-TSSOP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.4200","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/BQ2057CTSTR/alternatives.json"},"ai":{"faq":[{"question":"Can BQ2057CTSTR charge a 2-cell (2s) battery?","answer":"No. This part is designed for a single-cell (1s) battery pack only, with a termination voltage of 4.2V. It cannot charge a 2s pack, which requires an 8.4V termination voltage and a different charger topology."},{"question":"What is the closest pin-compatible alternative to BQ2057CTSTR?","answer":"Within the same BQ2057 family, the SOIC-8 variant (BQ2057CSN) is functionally identical but in a different package. For a pin-compatible charger with a different feature set, look at the BQ2407x series — but verify the pinout and charge voltage before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/BQ2057CTSTR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/BQ2057CTSTR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}