{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM49450SQ/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM49450SQ-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM49450SQ-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM49450SQ%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Boomer® Class D audio amplifier, LM49450SQ/NOPB, 2-channel stereo with headphone output, 2.5W x 2 @ 4Ω, I²C/I²S control, 32-WQFN exposed pad, -40°C to +85°C.","salesMarkdown":"## Class D efficiency and output-stage architecture The LM49450SQ/NOPB is a Class D stereo amplifier from the Boomer® family, delivering 2.5W per channel into a 4Ω load from a 2.7V–5.5V supply. Class D switching topology keeps quiescent losses low — important for battery-powered speakers where every milliwatt of idle current cuts into playtime. The output stage is configured as 2-channel (stereo) with a separate stereo headphone path, so a single IC drives both the main speakers and a headphone jack without an external mux. ## Digital audio interface and system control Digital audio enters via an I²S bus — the standard serial interface for codecs, DSPs, and Bluetooth audio modules. Volume, mute, 3D enhancement, and depop are set through an I²C control port, which also reports fault status from the short-circuit and thermal protection circuits. The depop feature suppresses the turn-on/turn-off thump that otherwise couples through the speaker. For a portable dock or smart speaker, this avoids the audible pop that users hear on power-up. ## Thermal and layout for the 32-WQFN exposed pad Housed in a 32-lead WFQFN with exposed pad (5×5 mm), the LM49450SQ/NOPB requires a thermal land on the PCB to sink heat from the Class D output stage. Surface-mount assembly follows standard QFN reflow profiles (MSL level not stated, but the exposed pad demands a solder paste stencil opening matching the datasheet land pattern). Tape & Reel or Cut Tape packaging is available for prototyping or production volume.","metaTitle":"LM49450SQ/NOPB Class D Audio Amp, 2.5W x 2 @ 4Ω, 32-WQFN","metaDescription":"Texas Instruments LM49450SQ/NOPB Boomer® Class D stereo amplifier, 2.5W x 2 into 4Ω, I²S/I²C, -40°C to +85°C, 32-WQFN. Active production, RoHS3. Request quote.","metaKeywords":null},"attributes":{"series":"Boomer®","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"Class D","Series":"Boomer®","Package":"Tape & Reel (TR); Cut Tape (CT)","Features":"3D, DAC, Depop, I²C, I²S, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control","Output Type":"2-Channel (Stereo) with Stereo Headphones","Mounting Type":"Surface Mount","Package / Case":"32-WFQFN Exposed Pad","lifecycle_stage":"eol_hot","Voltage - Supply":"2.7V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"32-WQFN (5x5)","Max Output Power x Channels @ Load":"2.5W x 2 @ 4Ohm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.2","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$6.20000","currency":"USD"},{"qty":10,"price":"$5.56800","currency":"USD"},{"qty":25,"price":"$5.26360","currency":"USD"},{"qty":100,"price":"$4.56190","currency":"USD"},{"qty":250,"price":"$4.32792","currency":"USD"},{"qty":500,"price":"$3.88344","currency":"USD"},{"qty":1000,"price":"$3.31050","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/0cf2bb057306e577c1dd8ed92058c8b6.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the output power of LM49450SQ/NOPB into 4Ω speakers?","answer":"The amplifier delivers 2.5W per channel into a 4Ω load, stereo. The headphone output is separate and drives lower-impedance loads typical of portable audio."},{"question":"What digital audio interface does LM49450SQ/NOPB use?","answer":"It uses an I²S serial audio input and an I²C control bus for volume, mute, 3D, and depop settings. The I²S interface connects directly to most audio codecs, DSPs, or Bluetooth audio SoCs."},{"question":"What package does LM49450SQ/NOPB come in?","answer":"It is supplied in a 32-lead WFQFN with exposed pad, 5×5 mm body (supplier device package 32-WQFN)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM49450SQ-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/LM49450SQ-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}}