LM4843 Datasheet | National Semiconductor

Description The LM4843 is a monolithic integrated circuit that provides DC volume control, and stereo bridged audio power amplifiers capable of producing 2W into 4Ω (Note 1) with less than 1.0% THD or 2.2W into 3Ω (Note 2) with less than 1.0% THD. Boomer ® audio integrated circuits were designed specifically to provide high quality audio while requiring a minimum amount of external ponents. The LM4843 incorporates a DC volume control with stereo bridged audio power amplifiers making it optimally suited for multimedia monitors, portable radios, desktop, and portable puter applications. The LM4843 features an externally controlled, low-power consumption shutdown mode, and both a power amplifier and headphone mute for maximum system flexibility and performance. Note 1: When properly mounted to the circuit board, the LM4843MH will deliver 2W into 4Ω. See the Application Information section for LM4843MH usage information. Note 2: LM4843MH that has been properly mounted to the circuit board and forced-air cooled will deliver 2.2W into 3Ω. Key Specifications n PO at 1% THD+N n into 3Ω n into 4Ω n into 8Ω n Shutdown current 2.2W (typ) 2.0W (typ) 1.1W (typ) 0.7µA (typ) Features n n n n Acoustically Enhanced DC Volume Control Taper Stereo bridged power amplifiers “Click and pop” suppression circuitry Thermal shutdown protection circuitry Applications n Portable and Desktop puters n Multimedia Monitors n Portable Radios, PDAs, and Portable TVs Block Diagram FIGURE 1. LM4843 Block Diagram Boomer ® is a registered trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation DS200383 .national. Connection Diagram Standard LM4843MH Top View Order Number LM4843MH See NS Package Number MXA20 .national. Absolute Maximum Ratings (Note 10) θJC (typ) - MXA20A θJA (typ) - MXA20A (exposed DAP) (Note 4) θJA (typ) - MXA20A (exposed DAP) (Note 3) θJA (typ) - MXA20A (exposed DAP) (Note 5) θJA (typ) - MXA20A...