LM4991 - National Semiconductor

LM4991 3W Audio Power Amplifier

The LM4991 is a mono bridged audio power amplifier capable of delivering 3W of continuous average power into a 3Ω load with less than 10% THD when powered by a 5V power supply (Note 1). To conserve power in portable applications, the LM4991’s micropower shutdown mode (ISD = 0.1µA, typ) is activated when VDD is applied to the SHUTDOWN pin. Boomer audio power .

Features

include thermal shutdown protection, unity-gain stability, and external gain set. Note 1: An LM4991LD that has been properly mounted to a circuit board will deliver 3W into 3Ω (at 10% THD). The other package options for the LM4991 will deliver 1.5W into 8Ω (at 10% THD). See the Application Information sections for further information concerning the LM4991LD and LM4991M. Key Specifications n Improved PSRR at 217kHz and 1kHz 64dB (typ) n PO at VDD = 5.0V, 10% THD, 1kHz n LM4991LD (only), 3Ω, 4Ω 3W (typ), 2.5W (typ) n All packages, 8Ω load 1.5W (typ) n Shutdown current 0.1µA (typ) Features Avai.