{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM49155TLX/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM49155TLX-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM49155TLX-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM49155TLX%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Boomer® series, LM49155TLX/NOPB, Class D, Class AB stereo headphone amplifier, 2-Channel output, I²C volume control, E²S noise suppression, 36-WFBGA DSBGA package, surface mount, active.","salesMarkdown":"## What this part is and where it fits The Texas Instruments LM49155TLX/NOPB is a stereo headphone amplifier from the Boomer® series that can operate in either Class D or Class AB mode. It is designed for portable and mobile audio applications where uplink noise suppression (E²S) and I²C-controlled volume are needed — think smartphone earpiece drivers, tablet audio paths, or any handset where the microphone return path must reject transmit-side noise. The part comes in a 36-ball DSBGA package for a compact footprint on a multi-layer PCB. ## Key features and what they mean for the BOM The dual-mode output stage (Class D vs Class AB) lets the designer trade efficiency against external filtering. Class D gives higher efficiency for battery-powered gear; Class AB avoids the LC filter on the output and keeps the BOM count lower. The I²C control bus handles volume, mode switching, and shutdown — no extra GPIOs needed. The E²S (Enhanced Earbud Squelch) feature is the part's main differentiator: it suppresses uplink noise picked up by the headset microphone during a call, which is the kind of spec that matters when the audio path goes through a baseband processor that does not have its own noise gate. Depop circuitry reduces the click-and-pop on power-up and shutdown, and the differential inputs reject common-mode noise from the audio source. The shutdown pin (also I²C-accessible) lets the system power down the amplifier when the headset is unplugged, saving standby current. ## Package and mounting The 36-DSBGA package requires a solder-mask-defined pad layout and a stencil with small apertures. This is a fine-pitch BGA — not a hand-solder part.","metaTitle":"LM49155TLX/NOPB TI Boomer® Class D/AB Audio Amp, 36-DSBGA","metaDescription":"LM49155TLX/NOPB from TI Boomer® series: Class D/AB stereo headphone amp with I²C volume control & E²S uplink noise suppression. Active, surface-mount 36-DSBGA.","metaKeywords":null},"attributes":{"series":"Boomer®","packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"Type":"Class D, Class AB","Series":"Boomer®","Package":"Bulk","Features":"Depop, Differential Inputs, E²S, I²C, Shutdown, Volume Control","Output Type":"Headphones, 2-Channel (Stereo)","Mounting Type":"Surface Mount","Package / Case":"36-WFBGA, DSBGA","lifecycle_stage":"eol_hot","Supplier Device Package":"36-DSBGA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.86","stockQuantity":0,"priceTiers":[{"qty":78,"price":"$3.86000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/b9f80938debd511c0a3374a872d20810.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does LM49155TLX/NOPB have I2C control?","answer":"Yes, the LM49155TLX/NOPB includes I²C control for volume, mode selection (Class D/AB), and shutdown."},{"question":"What is the output type of LM49155TLX/NOPB?","answer":"The LM49155TLX/NOPB has a stereo 2-channel headphone output, configurable as Class D or Class AB."},{"question":"Is LM49155TLX/NOPB compatible with 3.3V logic?","answer":"The part includes I²C control, which typically operates at 1.8 V or 3.3 V logic levels, but the exact logic supply voltage should be verified against the datasheet for this specific variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM49155TLX-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/LM49155TLX-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}}