LDA08B

LM4900 265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mode September 2001 LM4900 265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mode General Description The LM4900 is a bridged audio power amplifier capable of delivering 265mW 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 components. 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 1kHz for 265mW continuous average output power into 8Ω, VDD = 3.3V j THD+N at 1kHz for 675mW continuous 1.0% (max) average output power into 8Ω, VDD = 5V j Shutdown current 1.0% (max) 0.1µA (typ) Typ...