{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BQ2057CSN","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"BQ2057CSN","canonicalUrl":"https://icboms.com/texas-instruments/BQ2057CSN","factsUrl":"https://icboms.com/api/mcp/products/BQ2057CSN","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments BQ2057CSN, single-cell Li-Ion/Polymer linear charger IC, 4.2V battery pack voltage, programmable charge current, 15V max supply, -20°C to 70°C, 8-SOIC package.","salesMarkdown":"## Single-cell Li-Ion/Polymer linear charger in SOIC-8 Charge current is set by an external resistor — constant-current/constant-voltage profile with programmable current, no microcontroller interface needed. The 15 V maximum input voltage covers standard 5 V USB supplies and 9–12 V wall adapters, with the linear topology keeping the BOM simple for portable and handheld equipment. ## Programmable charge current and thermal envelope Charge current is constant and programmable via a single resistor between the PROG pin and ground — the range is set by the resistor value, not a register, so no firmware is required. The linear regulator dissipates the voltage drop between input and the 4.2 V battery as heat; at higher charge rates the SOIC-8 package's thermal impedance limits the practical current to around 1 A in free air. For a linear charger IC in an established process and SOIC-8 package, the supply outlook is stable — no imminent obsolescence risk for production builds.","metaTitle":"BQ2057CSN Li-Ion/Polymer Battery Charger IC, 4.2V, SOIC-8","metaDescription":"Texas Instruments BQ2057CSN single-cell Li-Ion/Polymer charger IC. Constant programmable current, 15V max input, SOIC-8. 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":"Tube","Interface":"-","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm 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-SOIC"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.1100","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/BQ2057CSN/alternatives.json"},"ai":{"faq":[{"question":"What is the charge current programmable range for BQ2057CSN?","answer":"Charge current is constant and programmable via an external resistor. The range is set by the resistor value — the datasheet provides the formula and recommended resistor values for typical charge rates."},{"question":"Is BQ2057CSN compatible with Li-Polymer batteries?","answer":"Yes, the BQ2057CSN is specified for both lithium-ion and lithium-polymer chemistries, with a 4.2 V battery pack voltage that matches standard single-cell Li-Polymer cells."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/BQ2057CSN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/BQ2057CSN 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}}