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LM4889 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4889 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 19 page  LM4889 1 Watt Audio Power Amplifier General Description The LM4889 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 2% 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 LM4889 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 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 ther- mal 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 75dB j Power Output at 5.0V & 2% THD 1.0W(typ.) j Power Output at 3.3V & 1% THD 400mW(typ.) j Shutdown Current at 3.3 & 2.6V 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 pF 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 Boomer® is a registered trademark of National Semiconductor Corporation. 20035801 FIGURE 1. Typical Audio Amplifier Application Circuit June 2003 © 2003 National Semiconductor Corporation DS200358 www.national.com |
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