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LM4673 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4673 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 18 page  LM4673 Filterless, 2.65W, Mono, Class D Audio Power Amplifier General Description The LM4673 is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A low noise, filterless PWM archi- tecture eliminates the output filter, reducing external compo- nent count, board area consumption, system cost, and sim- plifying design. The LM4673 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 LM4673 has high efficiency with speaker loads com- pared to a typical Class AB amplifier. With a 3.6V supply driving an 8 Ω speaker, the IC’s efficiency for a 100mW power level is 80%, reaching 88% at 400mW output power. The LM4673 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 LM4673 is externally configurable which allows independent gain control from multiple sources by summing the signals. Output short circuit and thermal over- load protection prevent the device from damage during fault conditions. Key Specifications j Efficiency at 3.6V, 400mW into 8 Ω speaker 88% (typ) j Efficiency at 3.6V, 100mW into 8 Ω speaker 80% (typ) j Efficiency at 5V, 1W into 8 Ω speaker 86% (typ) j Quiescent current, 3.6V supply 2.1mA (typ) j Total shutdown power supply current 0.01µA (typ) j Single supply range 2.4V to 5.5V j PSRR, f = 217Hz 78dB Features n Mono Class D Operation n No output filter required for inductive loads n Externally configurable gain n Very fast turn on time: 17µs (typ) n Minimum external components n "Click and pop" suppression circuitry n Micro-power shutdown mode n Available in space-saving 0.4mm pitch micro SMD and LLP Tm (Future Product) packages Applications n Mobile phones n PDAs n Portable electronic devices Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 201522J3 FIGURE 1. Typical Audio Amplifier Application Circuit December 2005 © 2005 National Semiconductor Corporation DS201522 www.national.com |
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