LM4838 Datasheet | National Semiconductor

Description The LM4838 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 LM4838 incorporates a DC volume control, stereo bridged audio power amplifiers and a selectable gain or bass boost, making it optimally suited for multimedia monitors, portable radios, desktop, and portable puter applications. The LM4838 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 LM4838LQ and LM4838MTE will deliver 2W into 4Ω. The LM4838MT and LM4838ITL will deliver 1.1W into 8Ω. See Application Information section Exposed-DAP package PCB Mounting Considerations for more information. Note 2: An LM4838LQ and LM4838MTE that have 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 (LQ & MTE) n into 4Ω (LQ & MTE) n into 8Ω (MT, MTE, ITL, & LQ) n Single-ended mode - THD+N at 85m W into 32Ω n Shutdown current 2.2W (typ) 2.0W (typ) 1.1W (typ) 1.0%(typ) 0.7µA (typ) Features n n n n n n DC Volume Control Interface System Beep Detect Stereo switchable bridged/single-ended power amplifiers Selectable internal/external gain and bass boost “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. LM4838 Block Diagram Boomer ® is a registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation DS200133 .national. Connec...