{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3503SQX-44","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3503SQX-44","canonicalUrl":"https://icboms.com/texas-instruments/LM3503SQX-44","factsUrl":"https://icboms.com/api/mcp/products/LM3503SQX-44","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM3503SQX-44, DC DC Regulator, Step-Up (Boost) topology, 2 outputs, 44V output, 750mA switch, 1MHz switching frequency, Analog and PWM dimming, 16-WFQFN exposed pad, -40°C to 85°C.","salesMarkdown":"## Boost regulator for LED backlighting — what the specs mean This is a step-up (boost) DC-DC regulator designed for backlight applications. It integrates two outputs with a 750 mA internal switch, switching at 1 MHz, and delivers up to 44 V output. Dimming is supported via both Analog and PWM methods — the PWM dimming path gives a wider contrast ratio for LCD backlights, while analog dimming suits simpler brightness control where the PWM switching noise might couple into the display driver. ## Package fit and temperature envelope Housed in a 16-WFQFN exposed pad package (4x4 mm body), it is surface-mount only. No external power sequencing required beyond the usual input decoupling.","metaTitle":"LM3503SQX-44 DC DC Regulator, 44V Boost, 1MHz, Obsolete","metaDescription":"Texas Instruments LM3503SQX-44 step-up boost regulator, 44V output, 750mA switch, 1MHz, Analog/PWM dimming.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Type":"DC DC Regulator","Series":"-","Dimming":"Analog, PWM","Package":"Tape & Reel (TR)","Topology":"Step-Up (Boost)","Frequency":"1MHz","Applications":"Backlight","Mounting Type":"Surface Mount","Package / Case":"16-WFQFN Exposed Pad","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Voltage - Output":"44V","Number of Outputs":"2","Internal Switch(s)":"Yes","Base Product Number":"LM3503","Operating Temperature":"-40°C~85°C(TA)","Voltage - Supply (Max)":"5.5V","Voltage - Supply (Min)":"2.5V","Supplier Device Package":"16-WQFN (4x4)","Current - Output / Channel":"750mA (Switch)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b5f4b20f44a7c0b93377b093bbaea4ad.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3503SQX-44/alternatives.json"},"ai":{"faq":[{"question":"Does LM3503SQX-44 require external components?","answer":"Yes, like any boost regulator, it requires external components — typically an inductor, input and output capacitors, and feedback resistors (though the output is fixed at 44 V, so the feedback divider is internal). The datasheet application circuit shows the recommended component values for stability and efficiency at the 1 MHz switching frequency."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3503SQX-44","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3503SQX-44 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}