{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC3728EG#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC3728EG~4PBF","canonicalUrl":"https://icboms.com/analog-devices/LTC3728EG~4PBF","factsUrl":"https://icboms.com/api/mcp/products/LTC3728EG%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC3728EG#PBF dual-phase synchronous buck controller, step-down topology, 3.5V-30V input, 260-550kHz switching, 99.4% duty cycle, 28-SSOP package, tube.","salesMarkdown":"## Dual-phase synchronous buck controller for multi-rail POL regulation The LTC3728EG#PBF is a dual-output, dual-phase synchronous buck controller from Analog Devices. It drives two independent step-down channels from a single 3.5V to 30V supply rail, making it a fit for point-of-load regulation in systems that need separate core and I/O voltages from one input bus. Each channel uses synchronous rectification, which replaces the external Schottky catch diode with a second MOSFET — this cuts conduction losses in the low-side path and lifts efficiency, especially at lower output voltages where the diode drop would otherwise dominate the loss budget. ## Switching frequency and duty cycle — inductor and headroom decisions The switching frequency is programmable from 260 kHz to 550 kHz. A lower frequency reduces switching losses and allows a larger inductor for lower ripple current; a higher frequency shrinks the inductor footprint but increases gate-drive losses in the external MOSFETs. The frequency range is set by a single resistor to ground — no external clock input is required, and the part does not support external clock synchronisation. Maximum duty cycle is 99.4%, meaning the high-side MOSFET can stay on for nearly the entire switching period. This is useful when the input voltage is only slightly above the output voltage — for example, generating 3.3V from a 3.6V rail — because the controller does not skip cycles or drop out early. The practical limit is the minimum off-time needed to refresh the bootstrap capacitor for the high-side gate drive. ## Control features and output configuration The controller includes Enable, Power Good, and Soft Start. The soft-start pin sets the output ramp time with an external capacitor, preventing inrush current from tripping the input supply. Power Good is an open-drain output that asserts when both output channels are within regulation — useful for sequencing downstream loads or driving a reset line. Output configuration is positive voltage, transistor-driver type. The controller generates the gate-drive signals for external N-channel MOSFETs — both the high-side and low-side FETs are external, so the designer selects the FETs based on the load current and switching frequency. The two phases operate 180 degrees out of phase, reducing input ripple current and allowing a smaller input capacitor than a single-phase controller of the same total output current. ## Package, temperature grade, and compliance The supplier device package is 28-SSOP.","metaTitle":"LTC3728EG#PBF Dual Buck Controller, 260-550kHz, 28-SSOP","metaDescription":"LTC3728EG#PBF dual-phase synchronous buck controller from Analog Devices. Active production, 3.5V-30V input, 99.4% duty cycle, -40°C to 85°C.","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":"2","Package / Case":"28-SSOP (0.209\\\", 5.30mm Width)","lifecycle_stage":"eol_hot","Control Features":"Enable, Power Good, Soft Start","Duty Cycle (Max)":"99.4%","Number of Outputs":"2","Output Configuration":"Positive","Frequency - Switching":"260kHz ~ 550kHz","Operating Temperature":"-40°C ~ 85°C (TA)","Synchronous Rectifier":"Yes","Supplier Device Package":"28-SSOP","Voltage - Supply (Vcc/Vdd)":"3.5V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$13.36","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$13.36000","currency":"USD"},{"qty":10,"price":"$12.27500","currency":"USD"},{"qty":25,"price":"$11.76600","currency":"USD"},{"qty":100,"price":"$10.36680","currency":"USD"},{"qty":250,"price":"$9.85800","currency":"USD"},{"qty":500,"price":"$9.22200","currency":"USD"},{"qty":1000,"price":"$9.00000","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source to LTC3728EG#PBF?","answer":"The LTC3728EUH#PBF shares the same core specifications — dual-output synchronous buck controller, 3.5V-30V input, 99.4% duty cycle, 260-550kHz switching, and the same control features. The difference is the package: the EUH variant comes in a 32-QFN (5mm x 5mm), while the EG#PBF is in a 28-SSOP. The pinout and footprint are not compatible, so a board layout change is required to swap between them."},{"question":"What compliance documentation does Analog Devices provide for LTC3728EG#PBF?","answer":"The LTC3728EG#PBF is ROHS3 compliant. Analog Devices provides the datasheet, PCN notifications, and RoHS/REACH declarations through their documentation portal. No UL or IEC certification is listed in the product record."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC3728EG~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/LTC3728EG~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}}