{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC3805HMSE-5#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC3805HMSE-5PBF","canonicalUrl":"https://icboms.com/analog-devices/LTC3805HMSE-5PBF","factsUrl":"https://icboms.com/api/mcp/products/LTC3805HMSE-5%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC3805HMSE-5#PBF multi-topology DC/DC controller, boost/flyback/SEPIC, 3.95-9.5V supply, 70-700kHz, -40 to 150°C, 10-MSOP-EP, Tube.","salesMarkdown":"The LTC3805HMSE-5#PBF: The Vcc/Vdd range of 3.95V to 9.5V sets the controller's own supply rail, not the output. A 5V or 9V bias rail from the input bus or an auxiliary winding powers the internal circuitry; below 3.95V the undervoltage lockout prevents operation. This is the first check when integrating into an existing power tree. ## 70kHz to 700kHz switching — transformer and inductor sizing The switching frequency range of 70kHz to 700kHz is set by a single resistor to ground. Lower frequencies reduce switching losses but require larger magnetics; higher frequencies shrink the transformer or inductor but increase core and FET losses. For a flyback design at 200kHz, a typical EE13 core handles 10-15W without saturation. ## Boost, flyback, SEPIC — topology flexibility for isolated or non-isolated rails The controller supports boost (non-isolated step-up), flyback (isolated step-up/step-down with a transformer), and SEPIC (non-isolated step-up/step-down with a coupled inductor). The output configuration is positive and isolation-capable, so a flyback design with an optocoupler on the secondary side delivers a regulated isolated rail. The single output phase drives an external transistor — no synchronous rectifier on-chip, so the designer adds a Schottky diode on the secondary. The -40°C to 150°C junction temperature range qualifies the LTC3805HMSE-5#PBF for under-hood automotive (AEC-Q100 Grade 0 equivalent) and high-ambient industrial environments. The 150°C TJ max means the die can run hot without derating the switching frequency, as long as the board-level thermal resistance keeps the junction below that ceiling. ## 10-MSOP-EP — package and board-fit note The pad is on the bottom of the package; a via array under it connects to an inner-layer ground plane to pull heat from the die. The 0.50mm pitch leads fan out easily on a two-layer board. The Tube delivery format suits prototype and low-volume builds; for reel quantities the order code changes. ## ROHS3 compliant — EU/global BOM clearance ROHS3 compliance means the part contains no restricted substances above the threshold — no lead, mercury, cadmium, or phthalates. This clears the BOM for EU RoHS, China RoHS, and most global environmental regulations without an exemption letter.","metaTitle":"LTC3805HMSE-5#PBF Boost/Flyback/SEPIC Controller, 70-700kHz","metaDescription":"Active Analog Devices LTC3805HMSE-5#PBF multi-topology DC/DC controller. Boost, flyback, SEPIC. 3.95-9.5V supply, 70-700kHz, -40 to 150°C. ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Interface & Transceivers"],"specifications":{"Package":"Tube","Function":"Step-Up, Step-Up/Step-Down","Topology":"Boost, Flyback, SEPIC","Clock Sync":"Yes","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"10-TFSOP, 10-MSOP (0.118\\\", 3.00mm Width) Exposed Pad","lifecycle_stage":"eol_hot","Control Features":"Enable, Soft Start","Duty Cycle (Max)":"80%","Number of Outputs":"1","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"70kHz ~ 700kHz","Operating Temperature":"-40°C ~ 150°C (TJ)","Synchronous Rectifier":"No","Supplier Device Package":"10-MSOP-EP","Voltage - Supply (Vcc/Vdd)":"3.95V ~ 9.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.73","stockQuantity":23,"priceTiers":[{"qty":1,"price":"$5.73000","currency":"USD"},{"qty":10,"price":"$5.14400","currency":"USD"},{"qty":25,"price":"$4.86320","currency":"USD"},{"qty":100,"price":"$4.21470","currency":"USD"},{"qty":250,"price":"$3.99860","currency":"USD"},{"qty":500,"price":"$3.58792","currency":"USD"},{"qty":1000,"price":"$3.02596","currency":"USD"},{"qty":2500,"price":"$2.87466","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is LTC3805HMSE-5#PBF's listed function and topology?","answer":"The function is Step-Up and Step-Up/Step-Down, supporting Boost, Flyback, and SEPIC topologies. It drives a single external transistor and is isolation-capable for flyback designs."},{"question":"What is LTC3805HMSE-5#PBF's listed package?","answer":"The package is a 10-TFSOP or 10-MSOP (0.118\", 3.00mm Width) with an exposed pad, supplied in Tube format. The supplier device package is 10-MSOP-EP."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC3805HMSE-5PBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LTC3805HMSE-5PBF when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}