LM48510 Datasheet | National Semiconductor

Description The LM48510 integrates a boost converter with a high efficiency mono, Class D audio power amplifier to provide 1.2W continuous power into an 8Ω speaker when operating on a 3.3V power supply with boost voltage (PV1) of 5.0V. When operating on a 3.3V power supply, the LM48510 is capable of driving a 4Ω speaker load at a continuous average output of 1.7W with less than 1% THD+N. The Class D amplifier is a low noise, filterless PWM architecture that eliminates the output filter, reducing external ponent count, board area consumption, system cost, and simplifying design. The LM48510's switching regulator is a current-mode boost converter operating at a fixed frequency of 0.6MHz. The LM48510 is designed for use in mobile phones and other portable munication devices. The high (76%) efficiency extends battery life when pared to Boosted Class AB amplifiers. The LM48510 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND). The gain of the Class D is externally configurable which allows independent gain control from multiple sources by summing the signals. Output short circuit and Thermal shutdown protection prevent the device from damage during fault conditions. Superior click and pop suppression eliminates audible transients during power-up and shutdown. Key Specifications -  Quiescent Power Supply Current -  Output Power (RL = 8Ω, THD+N ≤ 1%, VDD = 3.3V, PV1 = 5.0V) 6m A (typ) 1.2W (typ) 0.01μA (typ) -  Shutdown Current Features - - - - - - - - Click and Pop Suppression Low 0.01μA Shutdown Current 76% Efficiency Filterless Class D 2.7V - 5.0V operation (VDD) Externally configurable gain on Class D Very fast turn on time: 17μs Independent Boost and Amplifier shutdown pins Applications - - - - - Mobile Phones PDAs Portable media Cameras Handheld games Typical Application FIGURE 1. Typical LM48510 Audio Amplifier Application Circuit Boomer® is a registered trademark of National...