{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BQ25708RSNT","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"BQ25708RSNT","canonicalUrl":"https://icboms.com/texas-instruments/BQ25708RSNT","factsUrl":"https://icboms.com/api/mcp/products/BQ25708RSNT","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments BQ25708RSNT, multi-chemistry battery charger IC, SMBus interface, 1-4 cells, 8.128A max charge current, 19.2V max battery voltage, 24V supply max, 32-WFQFN exposed pad package, -40°C to 155°C junction temperature.","salesMarkdown":"## 8.128 A max charge current — sizing the power stage The BQ25708RSNT is a multi-chemistry battery charger IC from Texas Instruments that handles 1 to 4 series cells with a constant-current charge profile. The headline rating is the 8.128 A maximum charge current — that figure drives the inductor saturation current rating and the external MOSFET Rds(on) budget. A 10 µH inductor with a 10 A saturation rating and low-side FETs with sub-10 mOhm Rds(on) keep the power stage losses under control at full tilt. ## SMBus control — not a standalone charger This part communicates over an SMBus interface — the charge voltage, current limit, and input current limit are set through the bus, not by resistor dividers. That means the host microcontroller must have an SMBus port and firmware to initialise the charger on power-up. Without bus traffic the charger sits in its default or shutdown state, so a design that expects plug-and-play standalone operation needs a different part. ## 19.2 V battery pack — cell chemistry and count The maximum battery pack voltage is 19.2 V. For Li-ion that maps to a 4-series stack (4S, 16.8 V full), for LiFePO4 it covers a 5-series stack (5S, 18.25 V full). The 24 V maximum supply input gives headroom for a common 19 V laptop adapter or a 24 V industrial rail. The 1-4 cell range also covers single-cell portable gear up to 4S power-tool packs. ## 32-QFN package — rework and thermal reality The 32-WFQFN with exposed pad (4x4 mm) is a compact package that demands a controlled hot-air profile for rework. Without adequate copper area the junction temperature climbs above the 155 °C absolute maximum under sustained 8 A charge current. ## Built-in fault protections — fewer external parts Over-temperature, over-voltage, and short-circuit protection are integrated. The -40 °C to 155 °C junction temperature range covers automotive under-hood and industrial motor-drive environments where the die sees high ambient plus self-heating from the power stage.","metaTitle":"BQ25708RSNT Texas Instruments Battery Charger IC, SMBus","metaDescription":"Texas Instruments BQ25708RSNT multi-chemistry battery charger IC with SMBus interface. Max charge current 8.128A, 1-4 cell support, 32-QFN package.","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); Cut Tape (CT)","Interface":"SMBus","Mounting Type":"Surface Mount","Package / Case":"32-WFQFN Exposed Pad","Product Status":"Active","Number of Cells":"1 ~ 4","lifecycle_stage":"eol_hot","Fault Protection":"Over Temperature, Over Voltage, Short Circuit","Battery Chemistry":"Multi-Chemistry","Current - Charging":"Constant","Base Product Number":"BQ25708","Battery Pack Voltage":"19.2V (Max)","Charge Current - Max":"8.128A","Operating Temperature":"-40°C~155°C(TJ)","Programmable Features":"-","Voltage - Supply (Max)":"24V","Supplier Device Package":"32-QFN (4x4)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.5400","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/7595e1f369abf7723d6666e929010903.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does BQ25708RSNT support SMBus?","answer":"Yes, the BQ25708RSNT communicates over an SMBus interface. Charge parameters — voltage, current, input limit — are programmed through the bus. The host microcontroller must have an SMBus port and initialisation firmware."},{"question":"Can BQ25708RSNT charge LiFePO4?","answer":"Yes, the BQ25708RSNT supports multi-chemistry batteries. The 19.2 V maximum battery voltage covers a 5-series LiFePO4 stack (18.25 V full charge). The SMBus interface lets the host set the appropriate charge voltage and termination current for LiFePO4 chemistry."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/BQ25708RSNT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/BQ25708RSNT 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}}