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LM4670 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4670 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 20 page LM4670 Filterless High Efficiency 3W Switching Audio Amplifier General Description The LM4670 is a fully integrated single-supply high efficiency switching audio amplifier. It features an innovative modulator that eliminates the LC output filter used with typical switching amplifiers. Eliminating the output filter reduces external com- ponent count, simplifies circuit design, and reduces board area. The LM4670 processes analog inputs with a delta- sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modula- tors. The LM4670 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 2.3W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V. The LM4670 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 77%, reaching 88% at 600mW output power. The LM4670 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 LM4670 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 77% (typ) j Efficiency at 3.6V, 600mW into 8 Ω speaker 88% (typ) j Efficiency at 5V, 1W into 8 Ω speaker 87% (typ) j Quiescent current, 3.6V supply 4.8mA (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: 1.35ms (typ) n Minimum external components n "Click and pop" suppression circuitry n Micro-power shutdown mode n Short circuit protection n Available in space-saving microSMD and LLP packages Applications n Mobile phones n PDAs n Portable electronic devices Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 20089901 FIGURE 1. Typical Audio Amplifier Application Circuit July 2006 © 2006 National Semiconductor Corporation DS200899 www.national.com |
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