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LM4902 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4902 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 18 page LM4902 265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mode General Description The LM4902 is a bridged audio power amplifier capable of delivering 265mW of continuous average power into an 8 Ω 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 volt- age while requiring a minimal amount of external compo- nents. Since the LM4902 does not require output coupling capacitors, bootstrap capacitors or snubber networks, it is optimally suited for low-power portable applications. The LM4902 features an externally controlled, low power consumption shutdown mode, and thermal shutdown protec- tion. The closed loop response of the unity-gain stable LM4902 can be configured by external gain-setting resistors. Key Specifications j THD+N at 1kHz for 265mW continuous average output power into 8 Ω, V DD = 3.3V 1.0% (max) j THD+N at 1kHz for 675mW continuous average output power into 8 Ω, V DD = 5V 1.0% (max) j Shutdown current 0.1µA (typ) Features n MSOP and LLP 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 Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 20029801 FIGURE 1. Typical Audio Amplifier Application Circuit February 2002 © 2002 National Semiconductor Corporation DS200298 www.national.com |
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