LM4682 Datasheet | National Semiconductor

Description The LM4682 is a fully integrated single supply, high efficiency audio power amplifier solution. The LM4682 utilizes a proprietary balanced pulse-width modulation technique that lowers output noise and THD and improves PSRR when pared to conventional pulse width modulators. The LM4682 also features a stereo headphone amplifier that delivers 60m W into a 32Ω headset with less than 0.5% THD. The LM4682’s DC volume control has a +30d B to - 48d B range when speakers are driven and a range of +13d B to - 65d B when headphones are connected. All amplifiers are protected by thermal shutdown. Additionally, all amplifiers incorporate output current limiting function to protect their outputs from short circuit. The LM4682 features a low-power consumption shutdown mode. And its efficiency reaches 85% for a 10W output power with an 8Ω load. External heatsink is not required when playing music. The IC features click and pop reduction circuitry that minimizes audible popping during device turn-on and turn-off. The LM4682 is available in a 48-lead LLP package, ideal for portable and desktop puter applications. Key Specifications n n n n n n n PO at THD+N = 10%, VDD = 14V 10W (typ) THD+N at 1k Hz at 6W into 8Ω (Power Amp) 0.2% (typ) Efficiency at 7W into 8Ω 84% (typ) Total quiescent power supply current 52m A (typ) Total shutdown power supply current 0.1m A (typ) THD+N 1k Hz, 20m W, 32Ω (Headphone) 0.02% (typ) Single supply range 8.5V to 15V Features n n n n n n Pulse-width modulator. DC Volume Control Stereo headphone amplifier. “Click and pop” suppression circuitry. Micropower shutdown mode. 48 lead LLP package (No heatsink required). Applications n Flat Panel Displays n Televisions n Multimedia Monitors Boomer ® is a registered trademark of National Semiconductor Corporation. © 2006 National Semiconductor Corporation DS201196 .national. Block Diagram Block Diagram for LM4682 .national. Connection Diagram LLP Package Top View...