{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3643AYFFR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3643AYFFR","canonicalUrl":"https://icboms.com/texas-instruments/LM3643AYFFR","factsUrl":"https://icboms.com/api/mcp/products/LM3643AYFFR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM3643AYFFR, DC DC Regulator, Step-Up (Boost) topology, I²C dimming, 4 MHz, dual 1.9 A (Switch) outputs, 12-DSBGA package.","salesMarkdown":"## 12-DSBGA footprint and board integration The LM3643AYFFR comes in a 12-bump DSBGA (12-DSBGA) package — 0.4 mm pitch, no leads, the bumps are the terminals. That means the board needs a stencil with small apertures and a reflow profile tuned for the solder paste volume; no hand-soldering this one in the field. The 12-DSBGA supplier device package is the same as the case code, so the footprint in the datasheet is the one to use. Surface-mount only, and with a 0.4 mm pitch the PCB layout has to keep the traces short between the inductor and the output caps to minimise loop inductance at 4 MHz switching. ## Dual 1.9 A boost for camera flash This is a step-up (boost) regulator with two outputs, each capable of 1.9 A peak switch current. That 1.9 A per channel is the switch limit, not the LED current — the actual LED current depends on the sense resistor and the boost ratio, but the part can drive a pair of high-current flash LEDs from a battery that is lower than the LED forward voltage. The 4 MHz switching frequency keeps the inductor small, which matters when the whole flash subassembly has to fit behind a camera lens. Dimming is over I²C, so the host processor sets the flash current and timing digitally — no external PWM pin needed.","metaTitle":"LM3643AYFFR LED Driver, DC-DC Regulator, I²C, 12-DSBGA","metaDescription":"LM3643AYFFR DC-DC boost regulator for camera flash, dual 1.9 A channels, I²C dimming, 4 MHz, -40°C to 85°C, 12-DSBGA. Active, ROHS3. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"DC DC Regulator","Dimming":"I²C","Package":"Tape & Reel (TR); Cut Tape (CT)","Topology":"Step-Up (Boost)","Frequency":"4MHz","Applications":"Camera Flash","Mounting Type":"Surface Mount","Package / Case":"12-UFBGA, DSBGA","lifecycle_stage":"eol_hot","Number of Outputs":"2","Internal Switch(s)":"Yes","Operating Temperature":"-40°C ~ 85°C (TA)","Voltage - Supply (Max)":"5.5V","Voltage - Supply (Min)":"2.5V","Supplier Device Package":"12-DSBGA","Current - Output / Channel":"1.9A (Switch)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.87","priceTiers":[{"qty":1,"price":"$0.87000","currency":"USD"},{"qty":10,"price":"$0.78200","currency":"USD"},{"qty":25,"price":"$0.74200","currency":"USD"},{"qty":100,"price":"$0.60950","currency":"USD"},{"qty":250,"price":"$0.56976","currency":"USD"},{"qty":500,"price":"$0.50350","currency":"USD"},{"qty":1000,"price":"$0.39750","currency":"USD"},{"qty":3000,"price":"$0.37500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/eb1ad8bb99c94455540a9cecc8daa574.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3643AYFFR/alternatives.json"},"ai":{"faq":[{"question":"What is LM3643AYFFR's listed type and dimming interface?","answer":"The LM3643AYFFR is a DC DC Regulator type with a Step-Up (Boost) topology. Dimming is controlled via I²C."},{"question":"What package does LM3643AYFFR come in and can it be hand-soldered?","answer":"It comes in a 12-bump DSBGA (12-DSBGA) package. No, this is a fine-pitch BGA — it requires a reflow oven and stencil; not a field-swap part."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3643AYFFR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3643AYFFR 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}}