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LM4928 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4928 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 20 page  LM4928 1.2 Watt Stereo Fully Differential Audio Amplifier with RF Suppression and Shutdown Low General Description The LM4928 is an stereo fully differential stereo audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication devices. It is capable of delivering 1.2 watts of continuous average power to a 8 Ω 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 LM4928 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 LM4928 features a low-power consumption shutdown mode. To facilitate this, shutdown may be enabled by logic low. Additionally, the LM4928 features an internal thermal shutdown protection mechanism. The LM4928 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions. Key Specifications j Improved PSRR at 217Hz 90dB (typ) j Output Power at 5.0V @ 1% THD+N (8 Ω) 1.2W (typ) j Output Power at 3.0V @ 1% THD+N (8 Ω)400mW (typ) j Shutdown Current 0.1µA (typ) Features n RF Suppression Circuitry n Fully differential amplification n Available in space-saving micro SMD and LLP packages n Ultra low current shutdown mode n Can drive capacitive loads up to 100pF n Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions n 2.4 - 5.5V operation n No output coupling capacitors, snubber networks or bootstrap capacitors required Applications n Mobile phones n PDAs n Portable electronic devices and accessories Boomer® is a registered trademark of National Semiconductor Corporation. February 2006 © 2006 National Semiconductor Corporation DS201600 www.national.com |
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