LM4912 Datasheet | National Semiconductor

Description The LM4912 is an stereo audio power amplifier capable of delivering 40m W per channel of continuous average power into a 16Ω load or 25m W per channel into a 32Ω load at 1% THD form a 3V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external ponents. Since the LM4912 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The LM4912 features a low-power consumption shutdown mode and a power mute mode that allows for faster turn on time with less than 1m V voltage change at outputs on release. Additionally, the LM4912 features an internal thermal shutdown protection mechanism. The LM4912 is unity gain stable and may be configured with external gain-setting resistors. Key Specifications n PSRR at 217 Hz and 1k Hz 65d B (typ) n Output Power at 1k Hz with VDD = 2.4V, 1% THD+N into a 16Ω load 25m W (typ) n Output Power at 1k Hz with VDD = 3V, 1% THD+N into a 16Ω load 40m W (typ) n Shutdown Current 1.0µA (max) n Output Voltage change on release from Shutdown VDD = 2.4V, RL = 16Ω 1m V (max) n Output Noise, 20Hz to 20k Hz, A-weighted 10µV (typ) Features External gain-setting capability Available in space-saving MSOP package Ultra low current shutdown mode Mute mode allows fast turn-on (10ms) with less than 1m V change on outputs n 2.0V - 5.5V operation n Ultra low noise n Operation at low supply voltages n n n n Applications n Portable CD players n PDAs n Portable electronics devices Typical Application FIGURE 1. Typical Capacitive Coupled Output Configuration Circuit Boomer ® is a registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation DS200481 .national. Connection Diagrams MSOP Package Top View Order Number LM4912MM See NS Package Number MUB10A MSOP Package 200481A9 Top View G-Boomer Family A3 - LM4912MM .national. Absolute...