LM4900 Datasheet | National Semiconductor

Description The LM4900 is a bridged audio power amplifier capable of delivering 265m W of continuous average power into an 8Ω load with 1% THD+N from a 3.3V power supply. Boomer ® audio power amplifiers were designed specifically to provide high quality output power from a low supply voltage while requiring a minimal amount of external ponents. Since the LM4900 does not require output coupling capacitors, bootstrap capacitors or snubber networks, it is optimally suited for low-power portable applications. The LM4900 features an externally controlled, low power consumption shutdown mode, and thermal shutdown protection. The closed loop response of the unity-gain stable LM4900 can be configured by external gain-setting resistors. Features n MSOP, LLP, and SOP packaging n No output coupling capacitors, bootstrap capacitors, or snubber circuits are necessary n Thermal shutdown protection circuitry n Unity-gain stable n External gain configuration capability n Latest generation ’click and pop’ suppression circuitry Applications n Cellular phones n PDA’s n Any portable audio application Key Specifications j THD+N at 1k Hz for 265m W continuous average output power into 8Ω, VDD = 3.3V j THD+N at 1k Hz for 675m W continuous 1.0% (max) average output power into 8Ω, VDD = 5V j Shutdown current 1.0% (max) 0.1µA (typ) Typical Application DS200064-1 FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® is a registered trademark of National Semiconductor Corporation. © 2001 National Semiconductor Corporation DS200064 .national. Connection Diagrams MSOP and SOP Package DS200064-2 Top View Order Number LM4900MM, LM4900M See NS Package Number MUA08A, M08A LLP Package DS200064-76 Top View Order Number LM4900LD See NS Package Number LDA08B .national. Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications....