{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3503SQX-35","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3503SQX-35","canonicalUrl":"https://icboms.com/texas-instruments/LM3503SQX-35","factsUrl":"https://icboms.com/api/mcp/products/LM3503SQX-35","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM3503SQX-35, DC-DC Boost Regulator, Step-Up Topology, 35V Output, 750mA Switch, 1MHz, Analog and PWM Dimming, 16-WFQFN Exposed Pad, -40°C to 85°C.","salesMarkdown":"## Boost regulator for LED backlight strings The LM3503SQX-35 is a step-up (boost) DC-DC regulator from Texas Instruments, designed specifically for driving LED backlight strings in small-format displays. ## Dimming flexibility: Analog and PWM The regulator supports both analog and PWM dimming, giving the system designer two independent paths for brightness control. Analog dimming adjusts the LED current linearly via a control voltage; PWM dimming modulates the switch duty cycle at a frequency independent of the 1 MHz switching rate. This dual-mode capability is a practical advantage when the host processor's PWM peripheral is already allocated or when the application demands flicker-free analog dimming at low brightness levels. ## Obsolete — planning the replacement path For new designs or BOM sustainment, a direct pin-compatible replacement is not listed in the official record. The base product number LM3503 family may include other output-voltage variants (e.g., LM3503SQX-30 for 30 V), but these share the same obsolescence status. Housed in a 16-WFQFN with exposed pad (4x4 mm body), the LM3503SQX-35 requires a thermal land pattern on the PCB to dissipate heat from the internal switch.","metaTitle":"LM3503SQX-35 DC-DC Boost Regulator, 35V, 750mA, Obsolete","metaDescription":"LM3503SQX-35 step-up regulator for LED backlight, 35V output, 750mA switch, 1MHz, Analog/PWM dimming. Check availability.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["DC-DC Power Modules"],"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":"35V","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":"$1.5100","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b5f4b20f44a7c0b93377b093bbaea4ad.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3503SQX-35/alternatives.json"},"ai":{"faq":[{"question":"Does LM3503SQX-35 support PWM dimming?","answer":"Yes, the LM3503SQX-35 supports both analog and PWM dimming, giving the designer flexibility in brightness control for LED backlight applications."},{"question":"What is the maximum output current of LM3503SQX-35?","answer":"The internal switch is rated for 750 mA. This is the peak current the boost converter can deliver to the LED load, shared across the two output channels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3503SQX-35","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-35 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}}