{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BQ2057SNG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"BQ2057SNG4","canonicalUrl":"https://icboms.com/texas-instruments/BQ2057SNG4","factsUrl":"https://icboms.com/api/mcp/products/BQ2057SNG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments BQ2057SNG4, single-cell Lithium Ion/Polymer charge controller, 4.1V battery pack voltage, programmable charge current, 8-SOIC package, surface mount, -20°C to 70°C operating range.","salesMarkdown":"## Single-cell Li-Ion charge controller, 4.1V regulation The Texas Instruments BQ2057SNG4 is a linear charge management IC designed for single-cell Lithium Ion and Lithium Polymer battery packs, with a regulation voltage of 4.1V. It delivers a constant, programmable charge current — set by an external resistor — making it straightforward to tailor the charge rate to the cell capacity without firmware. The 8-SOIC package (0.154\", 3.90mm Width) is a common, rework-friendly footprint that handles well under a hot-air station if the board needs a swap — the body is small enough that the part lifts cleanly with preheat, and the pin 1 indicator is clear on the top mark. The 4.1V battery pack voltage is the float voltage for a single Li-Ion cell, which is lower than the more common 4.2V termination used in many consumer chargers. This part is intended for cells or applications where a 4.1V ceiling is specified — typically for extended cycle life or certain Li-Polymer chemistries that do not tolerate 4.2V. The charge current is programmable via a single resistor from the ISET pin to ground, giving the designer direct control over the charge rate without software overhead. Maximum supply voltage is 15V, so the input rail can be a 5V USB or a 12V wall adapter without an additional pre-regulator, as long as the input stays below that ceiling. ## Temperature range and operating environment The 8-SOIC package with surface-mount termination means the board layout needs a decent copper area under the part for thermal dissipation during constant-current charging — the package itself is not a power package, so the charge current should be derated if the ambient is near the 70°C upper limit.","metaTitle":"BQ2057SNG4 Li-Ion/Polymer Charge Controller, 4.1V, 8-SOIC","metaDescription":"TI BQ2057SNG4 single-cell Li-Ion/Polymer charge controller in 8-SOIC. 4.1V regulation, programmable current.","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)","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":"4.1V","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fbq2057","sourceUrl":null},"ai":{"faq":[{"question":"How do I set the charge current on BQ2057SNG4?","answer":"The charge current is programmable by connecting a resistor from the ISET pin to ground. The resistor value sets the constant-current charge rate — the datasheet provides the formula and recommended resistor range for the target current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/BQ2057SNG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/BQ2057SNG4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}