Part # LM4667 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM4667 Boomer ® Audio Power Amplifier Series Filterless High Efficiency 1.3W Switching Audio Amplifier

Part Details:

LM4667 September 2004 Filterless LM4667Filterless High Efficiency 1.3W Switching AudioAmplifierGeneral Description Key Specifications High The LM4667 is a fully integrated single-supply high efficiency j Efficiency at 3V, 100mW into 8 transducer 74% (typ) switching audio amplifier. It features an innovative modulatorthat eliminates the LC output filter used with typical switching j Efficiency at 3V, 450mW into 8 transducer 84% (typ) Efficiency amplifiers. Eliminating the output filter reduces parts count, j Efficiency at 5V, 1W into 8 transducer 86% (typ) simplifies circuit design, and reduces board area. The j Total quiescent power supply current 3.5mA (typ) LM4667 processes analog inputs with a delta-sigma modu- j Total shutdown power supply current 0.01µA (typ) lation technique that lowers output noise and THD whencompared to conventional pulse width modulators. j Single supply range 2.7V to 5.5V The LM4667 is designed to meet the demands of mobilephones and other portable communication devices. Operat- Features 1.3W ing on a single 3V supply, it is capable of driving 8 trans-ducer loads at a continuous average output of 450mW with n No output filter required for inductive transducers less than 1%THD+N. Its flexible power supply requirements n Selectable gain of 6dB or 12dB allow operation from 2.7V to 5.5V. n Very fast turn on time: 5ms (typ) Switching The LM4667 has high efficiency with an 8 transducer load n Minimum external components compared to a typical Class AB amplifier. With a 3V supply, n "Click and pop" suppression circuitry the IC s efficiency for a 100mW power level is 74%, reaching n Micro-power shutdown mode 84% at 450mW output power. n Short circuit protection The LM4667 features a low-power consumption shutdown n Available in space-saving micro SMD and MSOP mode. Shutdown may be enabled by driving the Shutdown packages pin to a logic low (GND). Audio The LM4667 has fixed selectable gain of either 6dB or 12dB. Applications The LM4667 has short circuit protection against a short from n Mobile phones the outputs to V , GND, or across the outputs. DD n PDAs

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LM4667.pdf Datasheet