LM4927 Datasheet | National Semiconductor

Description The LM4927 is a fully differential audio power amplifier primarily designed for demanding applications in mobile phones and other portable munication device applications. It is capable of delivering 2.5 watts of continuous average power to a 4Ω load with less than 10% 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 LM4927 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 LM4927 features a low-power consumption shutdown mode. To facilitate this, Shutdown may be enabled by logic low. Additionally, the LM4927 features an internal thermal shutdown protection mechanism. The LM4927 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 j Power Output at 5.0V @ 10% THD (4Ω) j Power Output at 3.3V @ 1% THD j Shutdown Current 85d B (typ) 2.5W (typ) 550m W (typ) 0.1µA (typ) Features Fully differential amplification Available in space-saving micro-array LLP package Ultra low current shutdown mode Can drive capacitive loads up to 100p F 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 n n n n n 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. © 2006 National Semiconductor Corporation DS201525 .national. Connection Diagrams 8 Pin LLP Package Top View Order Number LM4927SD See NS Package Number SDA08A 8 Pin...