LM4809 Datasheet | National Semiconductor

Description The LM4809 is a dual audio power amplifier capable of delivering 105m W per channel of continuous average power into a 16Ω load with 0.1% (THD+N) from a 5V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external ponents. Since the LM4809 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The unity-gain stable LM4809 can be configured by external gain-setting resistors. The LM4809 features an externally controlled, active-low, micropower consumption shutdown mode, as well as an internal thermal shutdown protection mechanism. Key Specifications n THD+N at 1k Hz at 105m W continuous average power into 16Ω 0.1% (typ) n THD+N at 1k Hz at 70m W continuous average power into 32Ω 0.1% (typ) n Shutdown Current 0.4µA (typ) Features n n n n n n Active-low shutdown mode "Click and Pop" reduction circuitry Low shutdown current LLP, MSOP, and SO surface mount packaging No bootstrap capacitors required Unity-gain stable Applications n n n n Headphone Amplifier Personal puters Microphone Preamplifier PDA’s Typical Application - Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors. FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® is a registered trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation DS200090 .national. Connection Diagrams MSOP Package MSOP Marking 20009066 20009002 Top View Order Number LM4809MM See NS Package Number MUA08A SO Package SO Marking 20009067 20009002 Top View Order Number LM4809MA See NS Package Number M08A LLP Package LLP Marking Top View Order Number LM4809LD See NS Package Number LDA08B .national. Absolute Maximum Ratings (Note 2) Thermal Resistance θJA (SO) θJC (SO) θJA (MSOP) θJC (MSOP) θJA (LLP) θJA...