{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3844DTRG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3844DTRG4","canonicalUrl":"https://icboms.com/texas-instruments/UC3844DTRG4","factsUrl":"https://icboms.com/api/mcp/products/UC3844DTRG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3844DTRG4, current-mode PWM controller, switching frequency up to 500kHz, max duty cycle 48%, single output transistor driver, 12V–28V supply, 14-SOIC surface-mount package, 0°C–70°C operating temperature.","salesMarkdown":"## Current-mode PWM controller for single-ended topologies The Texas Instruments UC3844DTRG4 is a current-mode PWM controller designed for single-ended power converter topologies including boost, buck, buck-boost, flyback, and forward converters. It integrates a transistor driver output, frequency control, and a 48% maximum duty-cycle clamp that prevents transformer saturation in flyback stages. ## Switching frequency and duty-cycle limits The oscillator runs up to 500 kHz, which sets the practical transformer size and snubber loss trade-off. At the upper end, core volume shrinks but switching losses in the MOSFET and rectifier rise; most designs land between 100 kHz and 250 kHz for a balanced flyback. The 48% duty-cycle ceiling is hard — the controller shuts off the output pulse before the on-time reaches half the period, guaranteeing a reset interval for the transformer core. ## Supply rail and UVLO thresholds Vcc range is 12 V to 28 V. The undervoltage lockout (UVLO) turn-on threshold is 16 V typical, turn-off 10 V typical — the 6 V hysteresis prevents chatter during startup on a slowly rising bias rail. Below 12 V the controller stays off; above 28 V the internal zener clamp limits the supply to protect the IC.","metaTitle":"UC3844DTRG4 PWM Controller, 500kHz, 48% Duty Cycle, 14-SOIC","metaDescription":"Texas Instruments UC3844DTRG4 current-mode PWM controller. Switching frequency up to 500kHz, max duty cycle 48%. Active lifecycle, 14-SOIC package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR)","Function":"Step-Up, Step-Down, Step-Up/Step-Down","Topology":"Boost, Buck, Buck-Boost, 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","Serial Interfaces":"-","Base Product Number":"UC3844","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"0°C~70°C(TA)","Synchronous Rectifier":"No","Supplier Device Package":"14-SOIC","Voltage - Supply (Vcc/Vdd)":"12V ~ 28V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/3edad1712993fb3b1751953d793dcfb6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3844DTRG4/alternatives.json"},"ai":{"faq":[{"question":"Is UC3844DTRG4 pin-to-pin compatible with UC3844?","answer":"Yes, the UC3844DTRG4 is the same die as the UC3844 in a 14-SOIC package with tape-and-reel packaging. The base product number UC3844 covers both the DIP and SOIC variants; the DTRG4 suffix specifies the 14-SOIC package and reel format."},{"question":"What is the difference between UC3844 and UC3845?","answer":"The UC3844 and UC3845 share the same current-mode PWM architecture and pinout, but differ in UVLO thresholds. UC3844 has a 16 V turn-on / 10 V turn-off; UC3845 has 8.4 V / 7.6 V. The UC3844 is chosen for bias rails above 12 V, the UC3845 for lower-voltage supplies down to 7.5 V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3844DTRG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3844DTRG4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}