LM4938

February 2005 www.DataSheet4U.com LM4938 Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain LM4938 Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain General Description The LM4938 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 components. The LM4938 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 computer applications. The LM4938 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, LM4938MH will deliver 2W into 4Ω. See Application Information section Exposed-DAP package PCB Mounting Considerations for more information. Note 2: An LM4938MH 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 Single-ended mode - THD+N at 92mW into 32Ω n Shutdown current 2.2W (typ) 2.0W (typ) 1.3W (typ) 1.0%(...