{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3405XMKX/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3405XMKX-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM3405XMKX-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM3405XMKX%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM3405XMKX/NOPB DC-DC regulator LED driver, 1.6 MHz buck topology, 1 A output, PWM dimming, TSOT-23-6 package, Tape & Reel.","salesMarkdown":"## 1 A buck LED driver in a TSOT-23-6 footprint The Texas Instruments LM3405XMKX/NOPB is a current-mode, fixed-frequency buck converter designed to drive a single LED string at up to 1 A from a 3 V to 15 V input rail. The internal switch handles the full 1 A load, so no external FET is needed; the compensation network is integrated, leaving only the inductor, input/output caps, and a sense resistor as the bill-of-materials adders. ## PWM dimming and thermal limits Dimming is done via a PWM signal on the EN pin — the part toggles the full 1 A output at the PWM frequency, giving a linear dimming curve from 0 % to 100 % duty cycle as long as the PWM period stays above the 1.6 MHz switching cycle. The output voltage can be set up to 13.5 V, which accommodates a string of three to four white LEDs in series (each with a ~3 V forward drop) plus the 200 mV sense resistor voltage. ## Active production and compliance RoHS3 compliant with no exemptions; the TSOT-23-6 package is lead-free and compatible with standard reflow profiles (260 °C peak).","metaTitle":"Texas Instruments LM3405XMKX/NOPB LED Driver, 1A Buck","metaDescription":"Texas Instruments LM3405XMKX/NOPB DC-DC regulator LED driver, 1A output, PWM dimming, 1.6MHz buck topology, TSOT-23-6 package. Active, RoHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"DC DC Regulator","Dimming":"PWM","Package":"Tape & Reel (TR); Cut Tape (CT)","Topology":"Step-Down (Buck)","Frequency":"1.6MHz","Applications":"Lighting","Mounting Type":"Surface Mount","Package / Case":"SOT-23-6 Thin, TSOT-23-6","lifecycle_stage":"eol_hot","Voltage - Output":"13.5V","Number of Outputs":"1","Internal Switch(s)":"Yes","Operating Temperature":"-40°C ~ 125°C (TJ)","Voltage - Supply (Max)":"15V","Voltage - Supply (Min)":"3V","Supplier Device Package":"TSOT-23-6","Current - Output / Channel":"1A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.13","priceTiers":[{"qty":1,"price":"$1.13000","currency":"USD"},{"qty":10,"price":"$1.00700","currency":"USD"},{"qty":25,"price":"$0.95560","currency":"USD"},{"qty":100,"price":"$0.78500","currency":"USD"},{"qty":250,"price":"$0.73384","currency":"USD"},{"qty":500,"price":"$0.64850","currency":"USD"},{"qty":1000,"price":"$0.51198","currency":"USD"},{"qty":3000,"price":"$0.48300","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/7396ad9d8827a5955287cc8ccd0386be.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3405XMKX%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between LM3405XMKX/NOPB and TLC5940RHBR?","answer":"The LM3405XMKX/NOPB is a 1 A buck regulator with integrated switch for driving a single LED string, while the TLC5940RHBR is a 16-channel linear constant-current sink driver (120 mA per channel) using a shift register interface. They are not pin-compatible or functionally interchangeable — the LM3405XMKX/NOPB suits a single high-current string, whereas the TLC5940RHBR drives multiple low-current channels for dot-matrix or segmented displays."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3405XMKX-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/LM3405XMKX-NOPB 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}}