{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3478MAX/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3478MAX-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM3478MAX-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM3478MAX%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM3478MAX/NOPB current-mode PWM controller, boost/flyback/SEPIC topologies, 100kHz-1MHz switching, 2.97V-40V supply, 8-SOIC, -40°C to 125°C.","salesMarkdown":"## What this controller brings to a boost or flyback rail The Texas Instruments LM3478MAX/NOPB is a current-mode PWM controller that handles boost, flyback, and SEPIC topologies from a single 8-SOIC package. It drives an external N-channel MOSFET with a 100% duty-cycle capability. The supply range is 2.97 V to 40 V. Switching frequency is programmable between 100 kHz and 1 MHz. The junction temperature rating is -40°C to 125°C. ## Switching frequency — what it means for the magnetics and the board The 100 kHz to 1 MHz programmable range is the spec that drives transformer and inductor selection. At the low end, 100 kHz lets you use a larger core with lower AC losses — useful when the design is cost-optimised and board space is not the constraint. At 1 MHz, the magnetics shrink significantly, but you pay for it in gate-drive losses and tighter layout to keep the switch node clean. The controller does not have clock sync, so if your system already runs a fixed switching frequency for EMI management, you will need to either accept the free-running frequency or look at a synchronisable part like the LM5150. ## Supply voltage and temperature — where this part fits The Vcc range is 2.97 V to 40 V. The junction temperature range is -40°C to 125°C. No synchronous rectifier inside. ## Control features and output configuration The enable pin and frequency control are the only on-chip adjustments. There is no soft-start pin, so the designer must account for inrush during startup through the external compensation network. The single transistor-driver output is configured for positive output voltages — standard for boost and flyback. Duty cycle goes to 100%, which is useful for boost converters that need to pass the input straight to the output during dropout or for pre-biased loads. The part does not include a current-sense amplifier; the current limit is set by an external sense resistor feeding the internal comparator. ## Lifecycle and sourcing The LM3478MAX/NOPB carries an Active lifecycle status and is ROHS3 compliant. For a pin-compatible alternative with automotive qualification, the LM5150QURUMRQ1 offers clock-sync capability and a 2.3 MHz switching ceiling, but it operates from a lower 1.5 V minimum supply and tops out at 87% duty cycle.","metaTitle":"LM3478MAX/NOPB Boost/Flyback/SEPIC Controller, 100kHz-1MHz","metaDescription":"TI LM3478MAX/NOPB multi-topology switching regulator controller. Boost, flyback, SEPIC. 2.97V-40V supply, 100kHz-1MHz, -40°C to 125°C. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Function":"Step-Up, Step-Up/Step-Down","Topology":"Boost, Flyback, SEPIC","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":"Enable, Frequency Control","Duty Cycle (Max)":"100%","Number of Outputs":"1","Output Configuration":"Positive","Frequency - Switching":"100kHz ~ 1MHz","Operating Temperature":"-40°C ~ 125°C (TJ)","Synchronous Rectifier":"No","Supplier Device Package":"8-SOIC","Voltage - Supply (Vcc/Vdd)":"2.97V ~ 40V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.74","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.74000","currency":"USD"},{"qty":10,"price":"$2.46100","currency":"USD"},{"qty":25,"price":"$2.32160","currency":"USD"},{"qty":100,"price":"$1.97780","currency":"USD"},{"qty":250,"price":"$1.85712","currency":"USD"},{"qty":500,"price":"$1.62498","currency":"USD"},{"qty":1000,"price":"$1.34641","currency":"USD"},{"qty":2500,"price":"$1.31400","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/e90169fe8a826e6b093388be3de7ac89.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3478MAX-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3478MAX-NOPB when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}