LM4911 Datasheet | National Semiconductor

Description The LM4911 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+N from 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 LM4911 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. In addition, the LM4911 may be configured for either single-ended capacitively coupled outputs or for OCL outputs (patent pending). The LM4911 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 LM4911 features an internal thermal shutdown protection mechanism. The LM4911 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 2.0µA (max) n Output Voltage change on release from Shutdown VDD = 2.4V, RL = 16Ω (C-Coupled) 1m V (max) n Mute Current 100µA (max) Features OCL or capacitively coupled outputs (patent pending) External gain-setting capability Available in space-saving MSOP package Ultra low current shutdown mode Mute mode allows fast turn-on (1ms) with less than 1m V change on outputs n 2V - 5.5V operation n Ultra low noise n n n n n Applications n Portable CD players n PDAs n Portable electronics devices Block Diagram FIGURE 1. Block Diagram Boomer ® is a registered trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation DS200314 .national. Typical Application FIGURE 2. Typical Capacitive Coupled Output Configuration Circuit FIGURE...