{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC3871ILXE#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC3871ILXE~4PBF","canonicalUrl":"https://icboms.com/analog-devices/LTC3871ILXE~4PBF","factsUrl":"https://icboms.com/api/mcp/products/LTC3871ILXE%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices PolyPhase® series, LTC3871ILXE#PBF, dual-output synchronous buck-boost switching controller, 1.2V to 100V supply range, 60kHz to 460kHz switching frequency, 48-LQFP exposed pad package, tray.","salesMarkdown":"## Wide-input buck-boost controller for multi-rail designs The LTC3871ILXE#PBF is a dual-output synchronous controller that handles step-up and step-down conversion from a single supply rail spanning 1.2V to 100V (Vcc/Vdd). It drives external N-channel MOSFETs in a buck-boost topology, with the switching frequency programmable between 60kHz and 460kHz via an external resistor. Two independent outputs with programmable phase shifting let you interleave the channels for reduced input ripple and smaller input capacitors — a common requirement when deriving multiple rails from a single battery or bus. ## Parametric fit: supply range and thermal envelope The 1.2V to 100V input range covers automotive 12V/24V systems, industrial 48V backplanes, and battery stacks where the voltage swings widely under charge and discharge. Operating temperature from -40°C to 125°C (TA) matches the industrial and automotive under-hood grade — the controller itself is rated for the full ambient range without derating. The 48-LQFP exposed pad package (7x7mm body) requires a thermal land on the PCB to pull heat from the die; the exposed pad is the primary thermal path, so the board layout must include vias to a copper plane. ## Control and protection features for robust designs Built-in control features include current limit, enable, frequency control, phase control, and soft start — enough to sequence two rails without an external supervisor. Synchronous rectification is enabled on both channels, which improves efficiency at high step-down ratios compared to a diode-based freewheel. Maximum duty cycle of 98% means the controller can run near-full on-time in step-down mode, useful when the input voltage is only marginally above the output target.","metaTitle":"Analog Devices LTC3871ILXE#PBF PolyPhase Buck-Boost","metaDescription":"Active LTC3871ILXE#PBF from Analog Devices. Dual-output synchronous buck-boost controller, 1.2V to 100V supply, 60kHz-460kHz switching, -40°C to 125°C. ROHS3.","metaKeywords":null},"attributes":{"series":"PolyPhase®","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Series":"PolyPhase®","Package":"Tray","Function":"Step-Up, Step-Down","Topology":"Buck, Boost","Clock Sync":"Yes","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"Programmable","Package / Case":"48-LQFP Exposed Pad","lifecycle_stage":"eol_hot","Control Features":"Current Limit, Enable, Frequency Control, Phase Control, Soft Start","Duty Cycle (Max)":"98%","Number of Outputs":"2","Output Configuration":"Positive","Frequency - Switching":"60kHz ~ 460kHz","Operating Temperature":"-40°C ~ 125°C (TA)","Synchronous Rectifier":"Yes","Supplier Device Package":"48-eLQFP (7x7)","Voltage - Supply (Vcc/Vdd)":"1.2V ~ 100V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$16.92","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$16.92000","currency":"USD"},{"qty":10,"price":"$15.54800","currency":"USD"},{"qty":25,"price":"$14.90360","currency":"USD"},{"qty":80,"price":"$13.13125","currency":"USD"},{"qty":250,"price":"$12.48680","currency":"USD"},{"qty":500,"price":"$11.68120","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/75050ae3a986b70abc1457274748ec9f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can LTC3871ILXE#PBF replace LTC3894EFE#TRPBF in an existing design?","answer":"The LTC3894 is a single-output step-down controller in a different package (TSSOP vs LQFP), so a direct drop-in replacement is not possible without a board layout change. The LTC3871 adds buck-boost capability and a second output, but the pinout and footprint differ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC3871ILXE~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/LTC3871ILXE~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}}