{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC2844BD1","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"UC2844BD1","canonicalUrl":"https://icboms.com/stmicroelectronics/UC2844BD1","factsUrl":"https://icboms.com/api/mcp/products/UC2844BD1","rawCanonicalId":null},"summary":{"shortDescription":"UC2844BD1, ON Semiconductor, current-mode PWM controller, boost/flyback topology, up to 500kHz switching, 48% max duty cycle, 8-SOIC package, -25°C to 85°C, 10V to 30V supply, ROHS3 compliant.","salesMarkdown":"## Current-mode PWM controller for boost and flyback converters The UC2844BD1 from ON Semiconductor is a current-mode pulse-width modulation (PWM) controller designed for step-up (boost) and step-up/step-down (flyback) converter topologies. It integrates a transistor driver output, frequency control, and operates from a 10V to 30V supply rail. The controller is rated for switching frequencies up to 500 kHz and enforces a 48% maximum duty cycle, which directly constrains the transformer turns ratio in flyback designs. The 48% max duty cycle is a hard limit, not a typical operating point. In a flyback converter, the duty cycle directly sets the reflected voltage across the primary winding. ## Switching frequency headroom up to 500 kHz The UC2844BD1 supports switching frequencies up to 500 kHz. Running at the upper end shrinks the magnetic components but increases switching losses and EMI. It remains a current-production part, not subject to last-time-buy or obsolescence risk at this time. The 8-SOIC package is widely stocked across the channel.","metaTitle":"UC2844BD1 Current-Mode PWM Controller, Boost/Flyback, 8-SOIC","metaDescription":"UC2844BD1 is a current-mode PWM controller for boost/flyback topologies. Up to 500 kHz switching, 48% max duty cycle, 10-30V supply. 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-Up, Step-Up/Step-Down","Topology":"Boost, Flyback","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"8-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":"-25°C ~ 85°C (TA)","Synchronous Rectifier":"No","Supplier Device Package":"8-SOIC","Voltage - Supply (Vcc/Vdd)":"10V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.29","priceTiers":[{"qty":1,"price":"$1.29000","currency":"USD"},{"qty":10,"price":"$1.14900","currency":"USD"},{"qty":25,"price":"$1.09040","currency":"USD"},{"qty":100,"price":"$0.89570","currency":"USD"},{"qty":250,"price":"$0.83732","currency":"USD"},{"qty":500,"price":"$0.73994","currency":"USD"},{"qty":1000,"price":"$0.64295","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a1e92e6bbc45d0f8e3020163c44f39c7.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC2844BD1/alternatives.json"},"ai":{"faq":[{"question":"What is the function of UC2844BD1?","answer":"UC2844BD1 is a current-mode PWM controller for boost and flyback DC-DC converter topologies. It drives an external power transistor and includes frequency control, a 48% max duty cycle, and operates from a 10V to 30V supply."},{"question":"Can UC2844BD1 be used in a flyback converter?","answer":"Yes, flyback is one of the explicitly supported topologies for this controller, along with boost. The 48% max duty cycle and up to 500 kHz switching frequency are well suited for single-ended flyback designs."},{"question":"What is the difference between UC2844BD1 and UC2844B?","answer":"The UC2844BD1 is the surface-mount 8-SOIC variant of the UC2844B controller family. The UC2844B typically refers to the DIP-8 through-hole version. Electrically the two are identical in function, topology support, duty cycle, and switching frequency range — the package is the only difference."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/UC2844BD1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/UC2844BD1 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}}