{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC3851EUD#TRPBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC3851EUD~4TRPBF","canonicalUrl":"https://icboms.com/analog-devices/LTC3851EUD~4TRPBF","factsUrl":"https://icboms.com/api/mcp/products/LTC3851EUD%23TRPBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC3851 series synchronous buck controller, LTC3851EUD#TRPBF, single-phase, 4-38V input, 250-750kHz, 16-QFN 3x3mm, Tape & Reel.","salesMarkdown":"## Single-phase synchronous buck controller The LTC3851EUD#TRPBF: Its 4V to 38V input supply range covers common 5V, 12V, and 24V rails, and the switching frequency is programmable from 250kHz to 750kHz via a resistor on the FREQ pin. With synchronous rectification integrated into the control loop, the controller delivers up to 99% duty cycle, making it suitable for high step-down ratios where the output voltage is close to the input rail. The single output phase targets moderate current applications where a multi-phase interleaved controller would add unnecessary complexity. ## Control features and thermal envelope Built-in control features include current limit, enable, frequency control, soft start, and output tracking — the tracking pin allows the output to follow an external reference during start-up, useful for sequencing multiple rails. The 16-lead WFQFN package (3x3mm) with exposed pad (supplier device package 16-QFN) requires a thermal land pattern on the PCB to conduct heat from the die to the board. The reel quantity is not listed here, but the TR suffix indicates standard 7-inch or 13-inch reel packaging typical for QFN devices.","metaTitle":"LTC3851EUD#TRPBF Analog Devices Buck Controller, 4-38V","metaDescription":"LTC3851EUD#TRPBF single-phase synchronous buck controller, 4V to 38V input, 250kHz-750kHz switching, 16-QFN. Active, ROHS3 compliant. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","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 ~ 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"},{"qty":2500,"price":"$3.13500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a0d07822976cf357aabcabbfdc67242c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source for LTC3851EUD#TRPBF?","answer":"The LTC3851EGN#PBF is a peer variant with the same buck controller core (single-phase, synchronous, 99% duty cycle, 4-38V input, 250kHz switching) but packaged in a 16-SSOP (GN) instead of the 16-QFN (UD). The pinout differs, so a board layout change is required — they are not drop-in replacements. The LTC3851AIMSE#PBF extends the operating temperature to -40°C to 125°C (TJ) and shifts the switching frequency to 235kHz typical, but again uses a different package (MSOP-16)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC3851EUD~4TRPBF","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~4TRPBF 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}}