{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BQ2057CTSTRG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"BQ2057CTSTRG4","canonicalUrl":"https://icboms.com/texas-instruments/BQ2057CTSTRG4","factsUrl":"https://icboms.com/api/mcp/products/BQ2057CTSTRG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments BQ2057 series, Battery Charger IC, Lithium Ion/Polymer, 1 cells, 4.2V, -20°C ~ 70°C TA, 8-TSSOP, Tape & Reel.","salesMarkdown":"## Single-cell Li-Ion linear charger in a small 8-pin package The Texas Instruments BQ2057CTSTRG4 is a linear charge-management IC designed for single-cell Lithium Ion or Lithium Polymer battery packs. It targets the charge voltage at 4.2V, the standard termination for one Li-Ion cell, and uses a constant-current / constant-voltage (CC/CV) profile. The charge current is programmable via an external resistor — no I2C or firmware needed, just a resistor value to set the current limit. The 4.2V battery pack voltage is fixed internally — this part is for single-cell Li-Ion packs only, not for 4.1V or 4.35V chemistries. The programmable charge current (set by a resistor from PROG to GND) lets you match the charge rate to the cell capacity: a 500 mAh cell might charge at 0.5C (250 mA), a 2000 mAh cell at 1C (2 A), but the linear regulator dissipates the voltage drop as heat, so the actual current is limited by thermal management in the 8-TSSOP package. Operating temperature spans -20°C to 70°C, which covers most portable consumer and industrial gear — handheld scanners, medical monitors, IoT sensors — but not automotive under-hood or engine-bay environments. The 15V absolute maximum supply input gives headroom for common 5V or 12V wall adapters. ## Active lifecycle — no end-of-life watch needed No last-time-buy clock is ticking, and no official successor part has been issued. ## Surface-mount 8-TSSOP — what to expect on the board The 8-TSSOP package (0.173\" body width, 4.40 mm) is a common small-outline footprint for linear chargers. It is surface-mount only, so rework requires hot air or a reflow oven — not a field-swap part for a technician's kit.","metaTitle":"BQ2057CTSTRG4 Li-Ion/Polymer Charger IC, 4.2V, 8-TSSOP","metaDescription":"Texas Instruments BQ2057CTSTRG4 single-cell Li-Ion/Polymer linear charger IC. 4.2V battery pack voltage, programmable charge current, -20°C to 70°C range.","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)","Interface":"-","Mounting Type":"Surface Mount","Package / Case":"8-TSSOP (0.173\\\", 4.40mm 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":"4.2V","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":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":"What is the charging current range for BQ2057CTSTRG4?","answer":"The charge current is constant and programmable via an external resistor — the datasheet provides the resistor value versus current table. The practical range depends on thermal dissipation in the 8-TSSOP package at the given input-to-battery voltage drop."},{"question":"Is BQ2057CTSTRG4 compatible with 4.2V Li-ion batteries?","answer":"Yes — the battery pack voltage is fixed at 4.2V, which is the standard termination voltage for single-cell Lithium Ion and Lithium Polymer cells."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/BQ2057CTSTRG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/BQ2057CTSTRG4 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}}