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LM4671 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4671 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 18 page  LM4671 Filterless High Efficiency 2.5W Switching Audio Amplifier General Description The LM4671 is a single supply, high efficiency 2.5W switch- ing audio amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. The LM4671 is designed to meet the demands of mobile phones and other portable communication devices. Operat- ing on a single 5V supply, it is capable of driving a 4 Ω 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 com- pared to a typical Class AB amplifier. With a 3V supply driving an 8 Ω speaker, the IC’s efficiency for a 100mW power level is 80%, reaching 88% at 400mW 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 j Efficiency at 3.6V, 100mW into 8 Ω speaker 80% (typ) j Efficiency at 3.6V, 400mW into 8 Ω speaker 88% (typ) j Efficiency at 5V, 1W into 8 Ω speakerr 86% (typ) j Quiescent current, 3.6V supply 2.8mA (typ) j Total shutdown power supply current 0.01µA (typ) j Single supply range 2.4V to 5.5V Features n No output filter required for inductive loads n Externally configurable gain n Very fast turn on time: 1ms (typ) n Minimum external components n "Click and pop" suppression circuitry n Micro-power shutdown mode n Available in space-saving microSMD package Applications n Mobile phones n PDAs n Portable electronic devices Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 201073J3 FIGURE 1. Typical Audio Amplifier Application Circuit March 2005 © 2005 National Semiconductor Corporation DS201073 www.national.com |
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