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LM4992 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4992 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 16 page  LM4992 420mW Stereo Cell Phone Audio Amplifier General Description The LM4992 is a stereo audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is ca- pable of delivering 1 watt, per channel, of continuous aver- age 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 LM4992 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 LM4992 features independent shutdown control for each channel and a low-power consumption shutdown mode, which is achieved by driving both shutdown pins with logic low. Additionally, the LM4992 features an internal ther- mal shutdown protection mechanism. The LM4992 contains advanced pop & click circuitry which eliminates noise which would otherwise occur during turn-on and turn-off transitions. The LM4992 is unity-gain stable and can be configured by external gain-setting resistors. Key Specifications j Improved PSRR at 217Hz & 1KHz 64dB (1KHz) j Stereo Output Power at 5.0V, 1% THD, 8 Ω 1.07W (typ) j Stereo Output Power at 3.3V, 1% THD, 8 Ω 420mW (typ) j Shutdown Current, Vdd = 3.3V 0.2µA (typ) Features n Available in space-saving LLP package n Ultra low current shutdown mode n BTL output can drive capacitive loads n Improved pop & click circuitry eliminates noise 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 Connection Diagram SDA14A 200761E6 Top View Order Number LM4992SD See NS Package Number SDA14A Boomer® is a registered trademark of National Semiconductor Corporation. February 2004 © 2004 National Semiconductor Corporation DS200761 www.national.com |
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