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LM4671 - Filterless High Efficiency 2.5W Switching Audio Amplifier

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 component count, board area consumption, system cost, and simplifying design.

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, 100mW into   8Ω speaker 80% (typ) 88% (typ) 86% (typ) 2.8mA (typ) 0.01µA (typ) 2.4V to 5.5V.
  •  Efficiency @ 3.6V, 400mW into    8Ω speaker speaker.
  •  Efficiency @ 5V, 1W into 8Ω.
  •  Quiescent curren.

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LM4671 Filterless High Efficiency 2.5W Switching Audio Amplifier www.DataSheet4U.com March 3, 2008 LM4671  Filterless High Efficiency 2.5W Switching Audio Amplifier General 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 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. 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.
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