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LM4891M Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4891M Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 20 page  LM4891 1 Watt Audio Power Amplifier General Description The LM4891 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 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 LM4891 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 LM4891 features a low-power consumption shutdown mode, which is achieved by driving the shutdown pin with logic high. Additionally, the LM4891 features an internal ther- mal shutdown protection mechanism. The LM4891 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4891 is unity-gain stable and can be configured by external gain-setting resistors. Key Specifications j PSRR at 217Hz, VDD = 5V, 8 Ω Load 62dB (typ) j Power Output at 5.0V & 1% THD 1.0W (typ) j Power Output at 3.3V & 1% THD 400mW (typ) j Shutdown Current 0.1µA (typ) Features n Available in space-saving packages: micro SMD, MSOP, SOIC, and LLP n Ultra low current shutdown mode n BTL output can drive capacitive loads n Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions n 2.2 to 5.5V operation n No output coupling capacitors, snubber networks or bootstrap capacitors required n Thermal shutdown protection n Unity-gain stable n External gain configuration capability Applications n Mobile Phones n PDAs n Portable electronic devices Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 20007401 FIGURE 1. Typical Audio Amplifier Application Circuit October 2002 © 2002 National Semiconductor Corporation DS200074 www.national.com |
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