{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC3851EUD-1#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC3851EUD-1~4PBF","canonicalUrl":"https://icboms.com/analog-devices/LTC3851EUD-1~4PBF","factsUrl":"https://icboms.com/api/mcp/products/LTC3851EUD-1%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC3851EUD-1#PBF, single-phase step-down (buck) DC/DC controller, synchronous rectification, 4V to 38V supply, 250kHz to 750kHz switching, 16-QFN (3x3mm) exposed pad, tube.","salesMarkdown":"## Single-phase synchronous buck controller — 4V to 38V input range The LTC3851EUD-1#PBF is a single-output, step-down (buck) switching regulator controller that drives external N-channel MOSFETs in a synchronous-rectifier topology. Its 4V to 38V supply range covers common industrial and intermediate bus rails without a pre-regulator. Switching frequency is programmable from 250kHz to 750kHz via a single resistor, letting the designer trade inductor size against efficiency. The 99% maximum duty cycle supports low-dropout operation near the input rail. ## Package and thermal — 16-QFN with exposed pad The exposed paddle is the primary thermal path and must be soldered to a copper area sized for the expected power dissipation. The ROHS3 compliance means no exemption-based lead in the solder finish. ## Control features and output configuration The controller integrates Enable, Frequency Control, Power Good, Soft Start, and Tracking. The Tracking pin allows the output to follow an external reference ramp during start-up, useful for sequencing multiple rails. Output configuration is positive, single-phase, with a transistor-drive output that directly drives the gates of external N-channel MOSFETs. The synchronous rectifier control outputs are complementary, preventing cross-conduction with proper dead-time selection. ROHS3 compliant — suitable for EU markets without exemption paperwork.","metaTitle":"LTC3851EUD-1#PBF Buck Controller, 4-38V, 250-750kHz, 16-QFN","metaDescription":"LTC3851EUD-1#PBF from Analog Devices: single-phase step-down controller, 4V to 38V input, synchronous rectification, 250-750kHz switching, 16-QFN (3x3mm).","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tube","Function":"Step-Down","Topology":"Buck","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"16-WFQFN Exposed Pad","lifecycle_stage":"eol_hot","Control Features":"Enable, Frequency Control, Power Good, Soft Start, Tracking","Duty Cycle (Max)":"99%","Number of Outputs":"1","Output Configuration":"Positive","Frequency - Switching":"250kHz ~ 750kHz","Operating Temperature":"-40°C ~ 85°C (TA)","Synchronous Rectifier":"Yes","Supplier Device Package":"16-QFN (3x3)","Voltage - Supply (Vcc/Vdd)":"4V ~ 38V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.87","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$5.87000","currency":"USD"},{"qty":10,"price":"$5.27300","currency":"USD"},{"qty":25,"price":"$4.98480","currency":"USD"},{"qty":100,"price":"$4.32000","currency":"USD"},{"qty":250,"price":"$4.09848","currency":"USD"},{"qty":500,"price":"$3.67756","currency":"USD"},{"qty":1000,"price":"$3.13500","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source to LTC3851EUD-1#PBF?","answer":"The LTC3851EMSE-1#PBF is a peer variant with the same core electricals (4-38V input, 250-750kHz, synchronous rectification, 99% duty cycle) but in an MSOP-16 with exposed pad package. The 16-QFN (3x3mm) of the LTC3851EUD-1#PBF is a smaller footprint; a board layout change is required to swap between them."},{"question":"What compliance documentation does Analog Devices provide for LTC3851EUD-1#PBF?","answer":"The part is ROHS3 Compliant. Standard Analog Devices documentation includes the datasheet and a RoHS certificate of compliance. No UL or IEC certification is listed for this controller IC."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC3851EUD-1~4PBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LTC3851EUD-1~4PBF when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}