LM4893 Datasheet | National Semiconductor

Description The LM4893 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable munication device applications. It is capable of delivering 1.1 watt of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external ponents. The LM4893 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 requirements. The LM4893 features a low-power consumption global shutdown mode, which is achieved by driving the shutdown pin with logic low. Additionally, the LM4893 features an internal thermal shutdown protection mechanism. The LM4893 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4893 is unity-gain stable and can be configured by external gain-setting resistors. Key Specifications j Improved PSRR at 5V, 3V, & 217Hz j Higher Power Output at 5V & 1% THD j Higher Power Output at 3V & 1% THD j Shutdown Current 62d B (typ) 1.1W (typ) 350m W (typ) 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 Instantaneous turn-on time n BTL output can drive capacitive loads up to 100p F n Advanced pop & click circuitry eliminates noises during turn-on and turn-off transitions n 2.2V - 5.5V operation n Available in space-saving µSMD, SO, and MSOP packages Applications n Mobile Phones n PDAs n Portable electronic devices Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® is a registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS200380 .national....