{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC2845AQ","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC2845AQ","canonicalUrl":"https://icboms.com/texas-instruments/UC2845AQ","factsUrl":"https://icboms.com/api/mcp/products/UC2845AQ","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC2845AQ current-mode PWM controller, Step-Up/Step-Down function, Boost/Buck/Flyback/Forward topology, 500 kHz switching, 14-SOIC package, Bulk.","salesMarkdown":"## Current-mode PWM controller for isolated and non-isolated supplies The Texas Instruments UC2845AQ is a current-mode PWM controller supporting boost, buck, flyback, and forward converter topologies — a single chip for step-up or step-up/step-down designs, with an output stage rated for driving a power MOSFET directly. Switching frequency goes up to 500 kHz, letting you shrink the magnetics and output capacitor compared to lower-frequency controllers, at the cost of tighter layout and faster gate-drive edges. The 48% maximum duty cycle limits the on-time per cycle — a deliberate ceiling for flyback and forward converters where the transformer reset voltage sets the off-time requirement. Operating from 7.6 V to 30 V on Vcc, the UC2845AQ starts up from a standard 12 V or 24 V bias rail and has headroom for a regulated auxiliary winding in a flyback supply. An engine-bay or outdoor base-station supply that sees 105°C ambient still has margin before the thermal shutdown threshold.","metaTitle":"Texas Instruments UC2845AQ PWM Controller, 500 kHz, 14-SOIC","metaDescription":"Texas Instruments UC2845AQ current-mode PWM controller. Active production, 500 kHz switching, 7.6-30 V supply, -40 to 125°C. 14-SOIC package. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"Not applicable","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Bulk","Function":"Step-Up, 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 ~ 125°C (TJ)","Synchronous Rectifier":"No","Supplier Device Package":"14-SOIC","Voltage - Supply (Vcc/Vdd)":"7.6V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.63","stockQuantity":0,"priceTiers":[{"qty":473,"price":"$0.63000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/94c6679a074b6e2762f6bb1306dd634f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the UC2845AQ's maximum duty cycle and switching frequency?","answer":"The UC2845AQ has a maximum duty cycle of 48% and switches at up to 500 kHz. The 48% ceiling is typical for current-mode controllers used in flyback and forward converters where transformer reset timing is critical."},{"question":"Is the UC2845AQ a drop-in replacement for the UCC2806DWTR?","answer":"No — the UCC2806DWTR is a dual-output controller with 50% duty cycle and synchronous rectifier capability, while the UC2845AQ is a single-output controller with 48% duty and no synchronous rectifier. The pinouts and control loops differ; a board spin is required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC2845AQ","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC2845AQ 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}}