{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4991MAX/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4991MAX-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM4991MAX-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM4991MAX%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Boomer® LM4991MAX/NOPB, Class AB mono audio amplifier, 1.5W into 8Ω, 2.2V–5.5V supply, Depop/Shutdown/Thermal Protection, 8-SOIC, -40°C to 85°C.","salesMarkdown":"## 1.5W mono into 8Ω — the speaker-driver spec that matters The Texas Instruments LM4991MAX/NOPB is a Boomer® series Class AB audio power amplifier delivering 1.5W into an 8Ω load from a single 2.2V to 5.5V supply. The part integrates depop circuitry to suppress turn-on/turn-off clicks, a low-power shutdown mode, and thermal protection — features aimed at battery-powered portable audio, speaker modules, and alert-tone generators where board space and BOM cost are tight. ## Supply range and shutdown — battery-life decisions The 2.2V to 5.5V supply range lets this amp run directly from a single Li-ion cell (3.0V–4.2V nominal) or a 3.3V/5.0V regulated rail. The shutdown pin (part of the feature set) pulls the quiescent current to near-zero when the audio path is idle — critical for extending standby life in a Bluetooth speaker or portable instrument. Thermal protection shuts the output stage before the die exceeds safe junction temperature, so a stalled speaker or high-ambient condition won't kill the part. The depop circuit ramps the output bias on startup, avoiding the thump that would otherwise couple through a small speaker. ## Lifecycle: active, no LTB concern It is ROHS3 compliant (lead-free).","metaTitle":"LM4991MAX/NOPB Class AB Audio Amplifier, 1.5W Mono 8-SOIC","metaDescription":"Texas Instruments LM4991MAX/NOPB Boomer® Class AB audio amp, 1.5W into 8Ω mono, 2.2-5.5V supply, -40 to 85°C, 8-SOIC. Active, available to order.","metaKeywords":null},"attributes":{"series":"Boomer®","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Type":"Class AB","Series":"Boomer®","Package":"Tape & Reel (TR); Cut Tape (CT)","Features":"Depop, Shutdown, Thermal Protection","Output Type":"1-Channel (Mono)","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"2.2V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"8-SOIC","Max Output Power x Channels @ Load":"1.5W x 1 @ 8Ohm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.68","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.68000","currency":"USD"},{"qty":10,"price":"$1.50100","currency":"USD"},{"qty":25,"price":"$1.42480","currency":"USD"},{"qty":100,"price":"$1.17020","currency":"USD"},{"qty":250,"price":"$1.09392","currency":"USD"},{"qty":500,"price":"$0.96672","currency":"USD"},{"qty":1000,"price":"$0.76320","currency":"USD"},{"qty":2500,"price":"$0.55650","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/9b516df9fae954dff61416d2384efd07.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the output power of LM4991MAX/NOPB at 8 ohms?","answer":"The LM4991MAX/NOPB delivers 1.5W per channel into an 8Ω load, mono output."},{"question":"What is the closest pin-compatible alternative to LM4991MAX/NOPB?","answer":"No official cross-reference or second-source alternate is recorded for this exact order code in the manufacturer data. Pin compatibility should be verified against the SOIC-8 footprint — several Boomer® family parts share the same pinout, but no specific alternate is confirmed here."},{"question":"Is LM4991MAX/NOPB recommended for new designs?","answer":"The 8-SOIC package and 2.2V–5.5V supply range keep it flexible for portable and industrial audio applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4991MAX-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/LM4991MAX-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}}