{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC3853EUJ#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC3853EUJPBF","canonicalUrl":"https://icboms.com/analog-devices/LTC3853EUJPBF","factsUrl":"https://icboms.com/api/mcp/products/LTC3853EUJ%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC3853EUJ#PBF, 3-Phase Synchronous Buck Controller, Step-Down (Buck), Transistor Driver Output, 250kHz-750kHz, 4.5V-24V Supply, 40-WFQFN Exposed Pad, -40°C to 125°C Junction, Tube.","salesMarkdown":"## Three-phase synchronous buck controller for dense POL rails The LTC3853EUJ#PBF is a three-phase synchronous buck controller from Analog Devices, designed for step-down conversion where output current demands exceed what a single phase can deliver efficiently. Three interleaved output phases share the load, reducing input and output ripple and spreading thermal dissipation across the board — useful for high-density point-of-load rails in telecom, datacom, and industrial equipment. The controller drives external N-channel MOSFETs and includes synchronous rectification, so efficiency holds up at lower output voltages where a Schottky catch diode would dominate losses. Supply range spans 4.5 V to 24 V. Switching frequency is adjustable from 250 kHz to 750 kHz. ## What the three-phase architecture buys you Compared to a two-phase controller like the LTC3850EGN-1#PBF, the LTC3853EUJ#PBF adds one output phase (3 vs 2) and extends the operating temperature range from 85°C ambient to 125°C junction (vs). The extra phase cuts per-phase inductor current and output ripple amplitude, which lets you use smaller output capacitors and spread the thermal load across an additional inductor and MOSFET set. The 125°C junction rating is the deciding factor if the board sits in a sealed enclosure or near a hot air exhaust — the LTC3850 peers top out at 85°C ambient, which is marginal for forced-air or outdoor environments. ## Control features and layout considerations Control features include current limit, enable, frequency control, power good, soft start, and output tracking. The tracking input lets the output voltage follow another rail during startup. ## Lifecycle and sourcing posture The LTC3853EUJ#PBF carries an Active lifecycle status and is ROHS3 compliant. There is no NRND flag or last-time-buy notice on this part, so it remains a valid selection for new designs and production builds. No direct second-source alternate is listed in the record, but the two-phase LTC3850 family (LTC3850EGN-1#PBF, LTC3850IUF#PBF, LTC3850EUFD#PBF) shares the same control feature set and buck topology if a lower-phase-count drop-in is acceptable for a parallel build.","metaTitle":"LTC3853EUJ#PBF 3-Phase Buck Controller, 250-750kHz, 40-QFN","metaDescription":"LTC3853EUJ#PBF 3-phase synchronous buck controller from Analog Devices. 4.5-24V input, 250-750kHz switching, -40 to 125°C junction. Active, ROHS3.","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":"3","Package / Case":"40-WFQFN Exposed Pad","lifecycle_stage":"eol_hot","Control Features":"Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking","Duty Cycle (Max)":"98%","Number of Outputs":"3","Output Configuration":"Positive","Frequency - Switching":"250kHz ~ 750kHz","Operating Temperature":"-40°C ~ 125°C (TJ)","Synchronous Rectifier":"Yes","Supplier Device Package":"40-QFN (6x6)","Voltage - Supply (Vcc/Vdd)":"4.5V ~ 24V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$10.67","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$10.67000","currency":"USD"},{"qty":10,"price":"$9.64000","currency":"USD"},{"qty":25,"price":"$9.19160","currency":"USD"},{"qty":100,"price":"$7.98120","currency":"USD"},{"qty":250,"price":"$7.62248","currency":"USD"},{"qty":500,"price":"$6.94988","currency":"USD"},{"qty":1000,"price":"$6.34500","currency":"USD"}]},"links":{"datasheetUrl":"https://www.analog.com/media/en/technical-documentation/data-sheets/3853fc.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does LTC3853EUJ#PBF support external clock synchronization?","answer":"No, the Clock Sync field is listed as No. The switching frequency is set by an external resistor and runs free-running — it does not lock to an external clock."},{"question":"What is the equivalent or alternative to LTC3853EUJ#PBF?","answer":"The closest functional peer is the LTC3850EGN-1#PBF, a two-phase buck controller with the same control features (current limit, enable, frequency control, power good, soft start, tracking) but a lower operating temperature range of -40°C to 85°C ambient versus the LTC3853's 125°C junction rating. The LTC3850IUF#PBF and LTC3850EUFD#PBF are also two-phase alternatives in different packages."},{"question":"What are the typical applications of LTC3853EUJ#PBF?","answer":"This three-phase buck controller is suited for high-current point-of-load rails in telecom infrastructure, datacom equipment, industrial control systems, and automotive auxiliary supplies where the 125°C junction rating and 4.5 V to 24 V input range match the environment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC3853EUJPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LTC3853EUJPBF 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}}