LM4858 Datasheet | National Semiconductor

Description The LM4858 is an audio power amplifier capable of delivering 1.5W (typ) of continuous average power into a mono 4Ω bridged-tied load (BTL) with 1% THD+N or 95m W per channel of continuous average power into stereo 32Ω singleended (SE) loads with 1% THD+N, using a 5V power supply. The LM4858 can automatically switch between mono BTL and stereo SE modes utilizing a headphone sense pin. It is ideal for any system that provides both a monaural speaker output and a stereo line or headphone output Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external ponents. Since the LM4858 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The LM4858 features an externally controlled, micropower consumption shutdown mode and thermal shutdown protection. The unity-gain stable LM4858’s gain is set by external gain-setting resistors Key Specifications n n n n n n n n n n Output Power at 1% THD+N, 1k Hz: LM4858LD 3Ω BTL LM4858LD 4Ω BTL LM4858MM 4Ω BTL LM4858MM,LD 8Ω BTL LM4858MM,LD 8Ω SE LM4858MM,LD 32Ω SE THD+N at 1k Hz, 95m W into 32Ω SE Single Supply Operation Shutdown Current 1.9W (typ) 1.7W (typ) 1.5W (typ) 1.1W (typ) 300m W (typ) 95m W (typ) 1% (typ) 2.4 to 5.5V 18µA (typ) Features n n n n n n n Mono 1.5W BTL or stereo 300m W output Logic controlled headphone sense “Click and pop” suppression circuitry No bootstrap capacitors required Thermal shutdown protection Unity-gain stable Available in space-saving MSOP and LLP packaging Applications n n n n Portable puters Desktop puters PDA’s Handheld games Connection Diagrams Top View 10 Lead MSOP Order Number LM4858MM See NS Package Number MUB10A Top View 14 Lead LLP Order Number LM4858LD See NS Package Number LDA14A Boomer ® is a registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation DS200647 .national. Free Datasheet...