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LM4879IBP Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4879IBP Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 25 page  LM4879 1.1 Watt Audio Power Amplifier General Description The LM4879 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 1.1 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 LM4879 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for lower-power portable applications where minimal space and power consumption are primary require- ments. The LM4879 features a low-power consumption global shut- down mode, which is achieved by driving the shutdown pin with logic low. Additionally, the LM4879 features an internal thermal shutdown protection mechanism. The LM4879 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4879 is unity-gain stable and can be configured by external gain-setting resistors. Key Specifications j PSRR: 5V, 3V @ 217Hz 62dB (typ) j Power Output at 5V & 1% THD+N 1.1W (typ) j Power Output at 3V & 1% THD+N 350mW (typ) j Shutdown Current 0.1µA (typ) Features n No output coupling capacitors, snubber networks or bootstrap capacitors required n Unity gain stable n Ultra low current shutdown mode n Fast turn on: 80ms (typ), 110ms (max) with 1.0µF capacitor n BTL output can drive capacitive loads up to 100pF n Advanced pop & click circuitry eliminates noises during turn-on and turn-off transitions n 2.2V - 5.0V operation n Available in space-saving µSMD, LLP, and MSOP packages Applications n Mobile Phones n PDAs n Portable electronic devices Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 20024301 FIGURE 1. Typical Audio Amplifier Application Circuit October 2004 © 2004 National Semiconductor Corporation DS200243 www.national.com |
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