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LM4671 Filterless High Efficiency 2.5W Switching Audio Amplifier


source: | post time:2010-05-05

Part Number(s)
(NSID)
Top View Type Pins MSL Rating Peak Reflow RoHS
Status
CAD Symbols Models Package
Marking
Format
LM4671ITL/NOPB
MICRO SMD 9 1 260 Detail Download N/A
XVG
I E7

PDFClick link to Download

Features

No output filter required for inductive loads
Externally configurable gain
Very fast turn on time: 17μs (typ)
Minimum external components
"Click and pop" suppression circuitry
Micro-power shutdown mode
Available in space-saving microSMD package

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.

The LM4671 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 3V supply driving an 8Ω 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 Specification

Efficiency @ 3.6V, 100mW into   8Ω speaker 80% (typ)
Efficiency @ 3.6V, 400mW into    8Ω speaker 88% (typ)
Efficiency @ 5V, 1W into 8Ω   speaker 86% (typ)
Quiescent current, 3.6V supply 2.8mA (typ)
Total shutdown power supply   current 0.01µA (typ)
Single supply range 2.4V to 5.5V

Applications

Mobile phones
PDAs
Portable electronic devices

Typical Application
click for larger image


Connection Diagram
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Typical Performance
*click for larger image



Prev:LM4670 Filterless High Efficiency 3W Switching Audio Amplifier
Next:LM4673 Filterless, 2.65W, Mono, Class D Audio Power Amplifier from the PowerWise® Family


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