{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC3851IUD#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC3851IUDPBF","canonicalUrl":"https://icboms.com/analog-devices/LTC3851IUDPBF","factsUrl":"https://icboms.com/api/mcp/products/LTC3851IUD%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC3851IUD#PBF, synchronous buck controller, step-down topology, 4V to 38V supply, 250kHz to 750kHz switching, transistor driver output, 1 output, 99% duty cycle, -40°C to 125°C, 16-WFQFN exposed pad, surface mount, tube.","salesMarkdown":"## Synchronous buck controller for 4V to 38V rails The LTC3851IUD#PBF from Analog Devices is a single-phase synchronous step-down switching regulator controller. It drives external N-channel MOSFETs to deliver a regulated positive output from input rails spanning 4V to 38V, making it suitable for intermediate bus conversion in industrial, telecom, and automotive power systems. The controller operates with a programmable switching frequency from 250kHz to 750kHz, letting the designer trade inductor size against switching losses. The 99% maximum duty cycle allows the output to stay in regulation through input voltage dips nearly down to the output voltage, useful for hold-up or battery-backed designs. Control features include current limit, enable input, frequency control via an external resistor, programmable soft start, and output tracking for supply sequencing. The part is rated for junction temperatures from -40°C to 125°C, covering industrial and under-hood automotive environments. ## Package and footprint Housed in a 16-lead WFQFN with exposed pad (3mm x 3mm body), the LTC3851IUD#PBF is a surface-mount device. The exposed pad must be soldered to a PCB thermal land and connected to the ground plane for adequate heat dissipation, especially at higher switching frequencies or elevated ambient temperatures. The supplier device package is 16-QFN (3x3). ## Lifecycle and compliance The LTC3851IUD#PBF is listed as Active in production status and is ROHS3 compliant.","metaTitle":"LTC3851IUD#PBF Buck Controller, 4V-38V, 250-750kHz, 16-QFN","metaDescription":"LTC3851IUD#PBF is an active, synchronous step-down buck controller from Analog Devices. 4V to 38V supply, 250kHz-750kHz switching, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"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":"Current Limit, Enable, Frequency Control, Soft Start, Tracking","Duty Cycle (Max)":"99%","Number of Outputs":"1","Output Configuration":"Positive","Frequency - Switching":"250kHz ~ 750kHz","Operating Temperature":"-40°C ~ 125°C (TJ)","Synchronous Rectifier":"Yes","Supplier Device Package":"16-QFN (3x3)","Voltage - Supply (Vcc/Vdd)":"4V ~ 38V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.6","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$6.60000","currency":"USD"},{"qty":10,"price":"$5.92900","currency":"USD"},{"qty":25,"price":"$5.60480","currency":"USD"},{"qty":100,"price":"$4.85740","currency":"USD"},{"qty":250,"price":"$4.60836","currency":"USD"},{"qty":500,"price":"$4.13506","currency":"USD"},{"qty":1000,"price":"$3.52500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a0d07822976cf357aabcabbfdc67242c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does LTC3851IUD#PBF have an equivalent or cross-reference?","answer":"The LTC3851EGN#PBF is a functional peer with the same control features and synchronous rectification, but it is rated for -40°C to 85°C ambient, not the 125°C junction range of the IUD variant. The LTC3851AIMSE#PBF shares the 125°C rating but has a slightly different switching frequency range. Neither is a direct drop-in replacement without verifying the temperature grade and frequency programming."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC3851IUDPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LTC3851IUDPBF when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}