{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LP3921SQE/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LP3921SQE-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LP3921SQE-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LP3921SQE%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Boomer® series LP3921SQE/NOPB single-cell Li-Ion battery charger IC, 950mA max charge current, I²C interface, 32-WFQFN Exposed Pad package, -40°C to 85°C operating temperature.","salesMarkdown":"## Single-cell Li-Ion charger with I²C control The Texas Instruments LP3921SQE/NOPB is a single-cell Lithium Ion battery charger IC from the Boomer® series, designed for constant-current, constant-voltage charging with a programmable charge current up to 950 mA. It communicates over an I²C interface, making it a good fit for portable devices where the host microcontroller manages the charging profile. The 32-WFQFN Exposed Pad package (5x5 mm) keeps the footprint small, and the -40°C to 85°C operating range means it can live in outdoor or industrial gear, not just a phone. ## Package and mounting The 950 mA max charge current is programmable via the I²C bus, so you can dial it down for smaller cells or slow charging. That constant-current phase is the bulk of the charge cycle for a single Li-Ion cell at 4.2 V. The fault protection covers over-temperature and reverse current — handy if the battery is connected backwards or the charger sees a thermal event. The 5.5 V max supply voltage is typical for USB-powered or 5 V rail designs. ## Package and mounting — field-swap reality It is a 32-lead WFQFN with an exposed pad, surface-mount only. No lab, no bench — if you are swapping this on site, you need a hot-air station and a steady hand. The exposed pad is the main thermal path; the datasheet layout shows the recommended via pattern under the pad. The Tape & Reel or Cut Tape option covers both production and prototype volumes. ## Lifecycle — no LTB risk The LP3921SQE/NOPB is listed as Active in production and ROHS3 compliant. For a BOM line that needs a single-cell charger, this part is safe to qualify for new designs.","metaTitle":"LP3921SQE/NOPB Li-Ion Battery Charger IC, 950mA, 32-WQFN","metaDescription":"Texas Instruments LP3921SQE/NOPB single-cell Li-Ion battery charger IC, 950mA max charge current, I²C interface, -40°C to 85°C, 32-WQFN.","metaKeywords":null},"attributes":{"series":"Boomer®","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Series":"Boomer®","Package":"Tape & Reel (TR); Cut Tape (CT)","Interface":"I²C","Mounting Type":"Surface Mount","Package / Case":"32-WFQFN Exposed Pad","Number of Cells":"1","lifecycle_stage":"eol_hot","Fault Protection":"Over Temperature, Reverse Current","Battery Chemistry":"Lithium Ion","Current - Charging":"Constant - Programmable","Battery Pack Voltage":"4.2V","Charge Current - Max":"950mA","Operating Temperature":"-40°C ~ 85°C (TA)","Voltage - Supply (Max)":"5.5V","Supplier Device Package":"32-WQFN (5x5)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.21","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$3.21000","currency":"USD"},{"qty":10,"price":"$2.87900","currency":"USD"},{"qty":25,"price":"$2.72120","currency":"USD"},{"qty":100,"price":"$2.35840","currency":"USD"},{"qty":250,"price":"$2.23752","currency":"USD"},{"qty":500,"price":"$2.00770","currency":"USD"},{"qty":1250,"price":"$1.71150","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/58d8b5be02e2e8153a6bd2665bc2a13b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can LP3921SQE/NOPB charge a 2-cell battery pack?","answer":"No, this part is designed for single-cell Lithium Ion packs only. The battery pack voltage is fixed at 4.2 V, and the number of cells is 1. For multi-cell charging you would need a different charger IC."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LP3921SQE-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LP3921SQE-NOPB 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}}