LM48311 Datasheet | National Semiconductor

Description The LM48311 is a single supply, high efficiency, mono, 2.6W, filterless switching audio amplifier. The LM48311 features National’s Enhanced Emissions Suppression (E2S) system, that features a unique patent-pending ultra low EMI, spread spectrum, PWM architecture, that significantly reduces RF emissions while preserving audio quality and efficiency. The E2S system improves battery life, reduces external ponent count, board area consumption, system cost, and simplifying design. The LM48311 is designed to meet the demands of portable multimedia devices. Operating from a single 5V supply, the device is capable of delivering 2.6W of continuous output power to a 4Ω load with less than 10% THD+N. Flexible power supply requirements allow operation from 2.4V to 5.5V. The LM48311 features both a spread spectrum modulation scheme, and an advanced, patented edge rate control (ERC) architecture that significantly reduces emissions, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency (η = 88%). The LM48311 features high efficiency pared to conventional Class AB amplifiers, and other low EMI Class D amplifiers. When driving and 8Ω speaker from a 5V supply, the device operates with 88% efficiency at PO = 1W. The gain of the LM48311 is internally set to 6d B, further reducing external ponent count. A low power shutdown mode reduces supply current consumption to 0.01µA. Advanced output short circuit protection with auto-recovery prevents the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. Key Specifications -  Efficiency at 3.6V, 400m W into 8Ω -  Efficiency at 5V, 1W into 8Ω -  Quiescent Power Supply Current at 5V -  Power Output at VDD = 5V, RL = 4Ω THD+N ≤ 10% THD+N ≤ 1% -  Power Output at VDD = 5V, RL = 8Ω THD+N ≤ 10% THD+N ≤ 1% -  Shutdown current 85% (typ) 88% (typ) 3.1m A 2.6W (typ) 2.1W (typ) 1.6W (typ) 1.3W (typ) 0.01μA...