{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BQ25120F3AYFPR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"BQ25120F3AYFPR","canonicalUrl":"https://icboms.com/texas-instruments/BQ25120F3AYFPR","factsUrl":"https://icboms.com/api/mcp/products/BQ25120F3AYFPR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments BQ25120F3AYFPR, 1-cell Li-ion/Polymer linear charger IC, 20V max input, 300 mA programmable charge current, I²C interface, 25-bump DSBGA (2.53x2.47 mm), -40°C to 85°C.","salesMarkdown":"## 20V input ceiling — why it matters for a 1S charger The BQ25120F3AYFPR is a linear charger for a single-cell lithium-ion or lithium-polymer battery that accepts a supply voltage up to 20 V. That 20 V ceiling is the part's defining advantage: it survives USB-C PD negotiation at 9 V or 15 V and tolerates 12 V wall adapters without an external buck pre-regulator, which keeps the BOM count low for a wearable or IoT node. ## 300 mA charge current — the charge-time floor The maximum charge current is 300 mA, programmable via I²C. For a 150 mAh TWS earbud battery that means roughly a 30-minute charge from empty; for a 500 mAh smartwatch cell it is closer to 100 minutes. The constant-current profile is set by an external resistor and the I²C register, so the same PCB can support different product tiers by firmware alone. ## Fault protection — no separate battery protector needed Over-voltage, over-current, over-temperature, and short-circuit protection are all integrated. That eliminates the discrete battery-protector IC and its associated passives, saving about 8 mm² of board area in a typical layout. The thermal regulation loop reduces charge current automatically when the die temperature exceeds the internal threshold, so the part does not simply shut down on a hot day — it throttles. ## 25-bump DSBGA — footprint and reflow reality The 25-bump DSBGA (2.53 x 2.47 mm) is among the smallest packages for a 1S linear charger at this current level. The 0.4 mm pitch and 0.25 mm solder-ball diameter require a Type 4 or finer solder-paste stencil and a reflow profile matched to the board thickness. X-ray inspection after reflow is recommended to confirm all bumps wetted; a head-in-pillow defect on one bump will float the charge-enable line.","metaTitle":"BQ25120F3AYFPR 1S Li-ion Linear Charger, 20V Input, 300 mA","metaDescription":"TI BQ25120F3AYFPR 1-cell Li-ion/Polymer linear charger. 20V max input, 300 mA programmable charge current, I²C control, 25-DSBGA.","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":"I²C","Mounting Type":"Surface Mount","Package / Case":"25-XFBGA, DSBGA","Product Status":"Active","Number of Cells":"1","lifecycle_stage":"eol_hot","Fault Protection":"Over Current, Over Temperature, Over Voltage, Short Circuit","Battery Chemistry":"Lithium Ion/Polymer","Current - Charging":"Constant - Programmable","Base Product Number":"BQ25120","Battery Pack Voltage":"4.35V","Charge Current - Max":"300mA","Operating Temperature":"-40°C ~ 85°C (TJ)","Programmable Features":"Current, Timer, Voltage","Voltage - Supply (Max)":"20V","Supplier Device Package":"25-DSBGA (2.53x2.47)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.9747","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/37fb891a4e721e561fb050c8d7ee7977.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is BQ25120F3AYFPR compatible with 4.2V lithium ion batteries?","answer":"Yes. The battery pack voltage is rated at 4.35 V, which covers the standard 4.2 V Li-ion termination voltage. The I²C-programmable voltage register can be set to 4.2 V, 4.35 V, or other values within the range, so the same IC works with both standard and high-voltage cells."},{"question":"Does BQ25120F3AYFPR have thermal regulation?","answer":"Yes. The fault-protection block includes over-temperature protection, and the charger reduces charge current when the die temperature exceeds the internal threshold, preventing a thermal shutdown during high-ambient or high-current operation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/BQ25120F3AYFPR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/BQ25120F3AYFPR 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}}