{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC2844D","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC2844D","canonicalUrl":"https://icboms.com/texas-instruments/UC2844D","factsUrl":"https://icboms.com/api/mcp/products/UC2844D","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC2844D current-mode PWM controller, Boost/Buck/Flyback/Forward topology, 500kHz switching, 48% max duty cycle, 14-SOIC surface-mount package, Tube.","salesMarkdown":"## Current-mode PWM controller for isolated supplies The Texas Instruments UC2844D is a current-mode PWM controller designed for isolated DC-DC converters using boost, buck, flyback, or forward topologies. Its output stage is a single transistor driver, configured for positive output with isolation capability. Switching frequency reaches up to 500 kHz, with a maximum duty cycle of 48%. The supply range spans 12 V to 28 V (Vcc/Vdd), and the operating temperature covers -40°C to 85°C — suited for industrial ambient conditions without extended temperature margin. ## Switching limits and control features The 48% duty cycle ceiling means the controller cannot exceed a 48% on-time ratio per switching period — a constraint that matters for transformer reset in single-ended flyback and forward designs. Above that, the core saturates before the cycle completes. Frequency control is available as a feature, but the part lacks clock synchronization (no sync pin) and does not support synchronous rectification. The single output phase drives a power switch directly; for multi-phase or interleaved topologies, a separate controller is needed. ## 14-SOIC package integration The supplier device package is 14-SOIC, delivered in Tube format. No exposed thermal pad — junction-to-ambient thermal resistance follows the standard SOIC-14 profile without a dedicated heat-sink path.","metaTitle":"Texas Instruments UC2844D PWM Controller, 500kHz, 14-SOIC","metaDescription":"Texas Instruments UC2844D current-mode PWM controller. Active, RoHS3. Boost, buck, flyback, forward topologies. Up to 500kHz, 48% max duty. 14-SOIC.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Tube","Function":"Step-Up, Step-Down, Step-Up/Step-Down","Topology":"Boost, Buck, Flyback, Forward","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"14-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Duty Cycle (Max)":"48%","Number of Outputs":"1","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"-40°C ~ 85°C (TA)","Synchronous Rectifier":"No","Supplier Device Package":"14-SOIC","Voltage - Supply (Vcc/Vdd)":"12V ~ 28V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.56","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.56000","currency":"USD"},{"qty":10,"price":"$1.40400","currency":"USD"},{"qty":25,"price":"$1.32480","currency":"USD"},{"qty":100,"price":"$1.12890","currency":"USD"},{"qty":250,"price":"$1.06000","currency":"USD"},{"qty":500,"price":"$0.92750","currency":"USD"},{"qty":1000,"price":"$0.76850","currency":"USD"},{"qty":2500,"price":"$0.75000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/3edad1712993fb3b1751953d793dcfb6.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What topologies does the UC2844D support?","answer":"The UC2844D supports boost, buck, flyback, and forward converter topologies. It is a current-mode controller with a single transistor driver output, making it a common choice for isolated flyback and forward supplies up to 500 kHz."},{"question":"What is the maximum duty cycle of the UC2844D?","answer":"The maximum duty cycle is 48%. This limit prevents transformer saturation in single-ended topologies by ensuring the core resets fully during the off-time."},{"question":"What package does the UC2844D come in?","answer":"It is delivered in Tube format."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC2844D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC2844D 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}}