LM4889 Datasheet | National Semiconductor

Description The LM4889 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 watt of continuous average power to an 8Ω BTL load with less than 2% 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 LM4889 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The LM4889 features a low-power consumption shutdown mode, which is achieved by driving the shutdown pin with a logic low. Additionally, the LM4889 features an internal thermal shutdown protection mechanism. The LM4889 contains advanced pop & click circuitry to eliminate noise which would otherwise occur during turn-on and turn-off transitions. The LM4889 is unity-gain stable and can be configured by external gain-setting resistors. Key Specifications j Improved PSRR at 217Hz, 5 - 3.3V j Power Output at 5.0V & 2% THD j Power Output at 3.3V & 1% THD j Shutdown Current at 3.3 & 2.6V 75d B 1.0W(typ.) 400m W(typ.) 0.01µA(typ.) Features n Available in space-saving MSOP, SOIC, LLP, and micro SMD packages n Ultra low current shutdown mode (3.3 to 2.6V - 0.01µA) n Can drive capacitive loads up to 500 p F n Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions n 2.2 - 5.5V operation n No output coupling capacitors, snubber networks or bootstrap capacitors required n Unity-gain stable n External gain configuration capability 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. © 2003 National Semiconductor...