LM4671 Datasheet | National Semiconductor

Description The LM4671 is a single supply, high efficiency 2.5W switching audio amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external ponent count, board area consumption, system cost, and simplifying design. The LM4671 is designed to meet the demands of mobile phones and other portable munication devices. Operating on a single 5V supply, it is capable of driving a 4Ω speaker load at a continuous average output of 2.1W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V. The LM4671 has high efficiency with speaker loads pared to a typical Class AB amplifier. With a 3V supply driving an 8Ω speaker, the IC's efficiency for a 100m W power level is 80%, reaching 88% at 400m W output power. The LM4671 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 LM4671 is externally configurable which allows independent gain control from multiple sources by summing the signals. Key Specifications -  Efficiency @ 3.6V, 100m W into   8Ω speaker 80% (typ) 88% (typ) 86% (typ) 2.8m A (typ) 0.01µA (typ) 2.4V to 5.5V -  Efficiency @ 3.6V, 400m W into    8Ω speaker speaker -  Efficiency @ 5V, 1W into 8Ω -  Quiescent current, 3.6V supply -  Total shutdown power supply current -  Single supply range Features - - - - - - - No output filter required for inductive loads Externally configurable gain Very fast turn on time: 17μs (typ) Minimum external ponents "Click and pop" suppression circuitry Micro-power shutdown mode Available in space-saving micro SMD package Applications - Mobile phones - PDAs - Portable electronic devices Typical Application 201073j3 FIGURE 1. Typical Audio Amplifier Application Circuit Boomer® is a registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation .national. Connection Diagrams 9 Bump micro SMD Package .. micro SMD...