{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ADP1851ACPZ-R7","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"ADP1851ACPZ-R7","canonicalUrl":"https://icboms.com/analog-devices/ADP1851ACPZ-R7","factsUrl":"https://icboms.com/api/mcp/products/ADP1851ACPZ-R7","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices ADP1851ACPZ-R7 step-down buck controller, single-output, synchronous rectifier, 2.75V-20V supply, 200kHz-1.5MHz switching, 16-LFCSP-WQ (4x4) package.","salesMarkdown":"## Single-phase synchronous buck controller for point-of-load regulation The ADP1851ACPZ-R7: It operates from a 2.75 V to 20 V supply rail and switches between 200 kHz and 1.5 MHz, giving the layout engineer flexibility to balance inductor size against switching losses. ## What the 90% max duty cycle and synchronous rectification mean for your rail A 90% maximum duty cycle means the high-side FET can stay on for up to 90% of each switching period — useful when the input voltage is only slightly above the output target, such as regulating 3.3 V from a 3.6 V lithium cell. Synchronous rectification replaces the freewheeling diode with a low-Rds(on) FET, cutting the rectifier drop from ~0.5 V to tens of millivolts; at 5 A output this saves over 2 W of dissipation compared to a non-synchronous design. The output type is Transistor Driver, meaning the chip itself does not integrate the power FETs — it drives external N-channel MOSFETs, so the designer selects FETs sized for the load current and thermal budget. ## Control features and clock synchronization for noise-sensitive designs Control features include current limit, enable, frequency control, power good, ramp, soft start, and tracking — the tracking input lets the output voltage follow another rail during startup, useful for sequencing FPGA core and I/O voltages. Clock sync capability (Yes) allows the switching frequency to lock to an external clock, shifting the switching harmonics away from a sensitive analog band or aligning with another converter's phase to reduce input ripple current. The output configuration is Positive, and the single-phase, single-output design targets point-of-load rails where a dedicated controller for one voltage is simpler than a multi-phase controller with unused phases. ## Package and board integration — 16-LFCSP-WQ with exposed pad The exposed pad carries the ground return for the gate-drive current loop — a poor thermal connection raises junction temperature above the 125°C max, while a poor electrical connection adds inductance that degrades switching waveforms.","metaTitle":"ADP1851ACPZ-R7 Buck Controller, 200kHz-1.5MHz, 16-LFCSP","metaDescription":"Analog Devices ADP1851ACPZ-R7 step-down buck controller, 2.75V-20V supply, 200kHz-1.5MHz switching, -40°C to +125°C. Active, ROHS3. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Function":"Step-Down","Topology":"Buck","Clock Sync":"Yes","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"16-WQFN Exposed Pad, CSP","lifecycle_stage":"eol_hot","Control Features":"Current Limit, Enable, Frequency Control, Power Good, Ramp, Soft Start, Tracking","Duty Cycle (Max)":"90%","Number of Outputs":"1","Output Configuration":"Positive","Frequency - Switching":"200kHz ~ 1.5MHz","Operating Temperature":"-40°C ~ 125°C (TJ)","Synchronous Rectifier":"Yes","Supplier Device Package":"16-LFCSP-WQ (4x4)","Voltage - Supply (Vcc/Vdd)":"2.75V ~ 20V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.78","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.78000","currency":"USD"},{"qty":10,"price":"$2.49900","currency":"USD"},{"qty":25,"price":"$2.36240","currency":"USD"},{"qty":100,"price":"$2.04750","currency":"USD"},{"qty":250,"price":"$1.94248","currency":"USD"},{"qty":500,"price":"$1.74300","currency":"USD"},{"qty":1500,"price":"$2.13000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/7e9c6bb2f9b4721d7138003bd426ac09.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source to ADP1851ACPZ-R7?","answer":"The ADP1853ACPZ-R7 is the closest single-output sibling — same buck topology, same 90% duty cycle, same 1.5 MHz max switching frequency, same control features, and same 16-LFCSP package. The primary difference is the ADP1853's supply voltage range starts at 3.0 V vs 2.75 V for the ADP1851, so check your minimum input rail before substituting."},{"question":"Will ADP1851ACPZ-R7 drop into a board designed for ADP1853ACPZ-R7?","answer":"Yes, the two parts share the same 16-LFCSP-WQ (4x4) package and pinout, so the mechanical fit is identical. The electrical difference is the ADP1851's lower minimum supply (2.75 V vs 3.0 V), meaning the ADP1851 can be used as a drop-in replacement that actually extends the input range. No board respin is required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/ADP1851ACPZ-R7","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/ADP1851ACPZ-R7 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}}