{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3503SQ-44","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3503SQ-44","canonicalUrl":"https://icboms.com/texas-instruments/LM3503SQ-44","factsUrl":"https://icboms.com/api/mcp/products/LM3503SQ-44","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM3503SQ-44, DC DC Regulator, Step-Up (Boost) topology, 44V output, 2 outputs, 1 MHz switching, 16-WFQFN Exposed Pad, industrial temp -40°C to 85°C","salesMarkdown":"Any available units are from existing stock, not new manufacture. RoHS non-compliant — verify the BOM's environmental compliance requirements before committing. This part does not carry a current RoHS exemption. ## Boost LED driver with dual 44V outputs The LM3503SQ-44 is a DC-DC boost regulator designed for backlight applications. It integrates two switch outputs each rated for 750 mA switch current, allowing independent control of two LED strings. Output voltage reaches 44V, which supports driving multiple series-connected LEDs per channel — typical for medium-size LCD backlight panels. Dimming is supported via both Analog and PWM methods, giving the designer flexibility in brightness control and EMI management. ## Supply range and package fit Operates from a supply voltage of 2.5V to 5.5V, covering single-cell Li-Ion and 3.3V/5V rails. Housed in a 16-WFQFN Exposed Pad package, supplier device package 16-WQFN (4x4 mm). ## Second-source and replacement options The closest functional sibling is the LM3500TL-16, a single-output boost driver with 0.4 A switch current and the same 1 MHz frequency and backlight application. It is not a direct pin-for-pin replacement — the package and output count differ. The LM3508TL/NOPB is a lower-current (0.03 A) single-output PWM-dimming boost driver with 850 kHz switching.","metaTitle":"LM3503SQ-44 Texas Instruments LED Driver – Obsolete","metaDescription":"Texas Instruments LM3503SQ-44 DC-DC boost LED driver, 44V output, 2 channels, 1 MHz, industrial temp. Obsolete – sourced per RFQ. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Type":"DC DC Regulator","Series":"-","Dimming":"Analog, PWM","Package":"Tape & Reel (TR); Cut Tape (CT)","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":"$0.7100","priceTiers":[{"qty":425,"price":"$0.71000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/7a43ad7663a9a114c59bd5a2e0939447.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3503SQ-44/alternatives.json"},"ai":{"faq":[{"question":"Is the LM3503SQ-44 obsolete?","answer":"Yes, Texas Instruments has marked the LM3503SQ-44 as Obsolete. No new production is planned. The part is RoHS non-compliant."},{"question":"What is a direct replacement for LM3503SQ-44?","answer":"Texas Instruments does not list a direct pin-compatible replacement. The LM3500TL-16 is a single-output sibling with 0.4 A switch current; the LM3508TL/NOPB is a lower-current single-output option. Neither is a drop-in substitute — verify the BOM's output count, current, and package requirements."},{"question":"Where can I buy LM3503SQ-44?","answer":"As an obsolete part, availability is limited to existing distributor and broker stock. We source and quote to order against your BOM quantity — submit an RFQ for current pricing and delivery options. No stock-holding claim is made here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3503SQ-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/LM3503SQ-44 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T17:57:21.981Z","lastPublished":"2026-07-17T17:57:21.981Z","indexable":true}}