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LM4870 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4870 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 8 page  LM4870 1.1W Audio Power Amplifier with Shutdown Mode General Description The LM4870 is a bridge-connected audio power amplifier ca- pable of delivering 1.1W of continuous average power to an 8 Ω load with less than 0.5% THD+N over the audio spectrum from a 5V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal number of external components. Since the LM4870 does not require output coupling capacitors, bootstrap capacitors or snubber networks, it is optimally suited for low-power portable sys- tems. The LM4870 features an externally controlled, low-power consumption shutdown mode, as well as an internal thermal shutdown protection mechanism. It also includes two head- phone control inputs and a headphone sense output for ex- ternal monitoring. The LM4870 is unity-gain stable and the gain is set using external resistors. Key Specifications n THD+N at 1W into 8 Ω 0.5% (max) n Output power into 8 Ω at 1kHz at 10%THD+N 1.5W (typ) n Shutdown Current 0.6µA (typ) Features n No output coupling capacitors, bootstrap capacitors, or snubber circuits are necessary n Small Outline (SOIC) power packaging n Unity-gain stable n External gain configuration capability Applications n Personal computers n Desktop computers n Low voltage audio system Typical Application Connection Diagram Boomer® is a registered trademark of National Semiconductor Corporation. DS100094-1 FIGURE 1. Typical Audio Amplifier Application Circuit Small Outline Package DS100094-2 Top View Order Number LM4870M See NS Package Number M16A October 1997 © 1999 National Semiconductor Corporation DS100094 www.national.com |
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