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LM4901MM Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4901MM Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 24 page LM4901 1.6 Watt Audio Power Amplifier with Selectable Shutdown Logic Level General Description The LM4901 is an audio power amplifier primarily designed for demanding applications in mobile phones and other por- table communication device applications. It is capable of delivering 1 watt of continuous average power to an 8 Ω BTL load and 1.6 watts of continuous avearge power to a 4 Ω BTL load with less than 1% distortion (THD+N) from a 5V DC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4901 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage appli- cations where minimal power consumption is a primary re- quirement. The LM4901 features a low-power consumption shutdown mode. To facilitate this, Shutdown may be enabled by either logic high or low depending on mode selection. Driving the shutdown mode pin either high or low enables the shutdown pin to be driven in a likewise manner to enable shutdown. The LM4901 contains advanced pop & click circuitry which eliminates noise which would otherwise occur during turn-on and turn-off transitions. The LM4901 is unity-gain stable and can be configured by external gain-setting resistors. Key Specifications j Improved PSRR at 217Hz & 1KHz 62dB j Power Output at 5.0V, 1% THD, 4 Ω 1.6W (typ) j Power Output at 5.0V, 1% THD, 8 Ω 1.07W (typ) j Power Output at 3.0V, 1% THD, 4 Ω 525mW (typ) j Power Output at 3.0V, 1% THD, 8 Ω 390mW (typ) j Shutdown Current 0.1µA (typ) Features n Available in space-saving packages: LLP, micro SMD, and MSOP n Ultra low current shutdown mode n BTL output can drive capacitive loads n Improved pop & click circuitry eliminates noise during turn-on and turn-off transitions n 2.0 - 5.5V operation n No output coupling capacitors, snubber networks or bootstrap capacitors required n Unity-gain stable n External gain configuration capability n User selectable shutdown High or Low logic Level Applications n Mobile Phones n PDAs n Portable electronic devices Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 20019801 FIGURE 1. Typical Audio Amplifier Application Circuit December 2002 © 2002 National Semiconductor Corporation DS200198 www.national.com |
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