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LM4673 Filterless, 2.65W, Mono, Class D Audio Power Amplifier from the PowerWise® Family


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
LM4673SD/NOPB
LM4673SD
LLP 8 1
1
260
260
Detail Download N/A
ZXYTT
L4673
LM4673SDX/NOPB
LM4673SDX
LLP 8 1
1
260
260
Detail Download N/A
ZXYTT
L4673
LM4673TM/NOPB
MICRO SMD 9 1 260 Detail Download N/A
XVG
I G4
LM4673TMX/NOPB
MICRO SMD 9 1 260 Detail Download N/A
XVG
I G4

PDFClick link to Download

Description

The LM4673 is a single supply, high efficiency, 2.65W, mono, Class D 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 LM4673 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 LM4673 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 3.6V supply driving an 8Ω 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 overload protection prevent the device from damage during fault conditions.

Key Specification

Efficiency at 3.6V, 400mW into 8Ω speaker 88% (typ)
Efficiency at 3.6V, 100mW into 8Ω speaker 80% (typ)
Efficiency at 5V, 1W into 8Ω speaker 86% (typ)
Quiescent current, 3.6V supply 2.1mA (typ)
Total shutdown power supply current 0.01µA (typ)
Single supply range 2.4V to 5.5V
PSRR, f = 217Hz 78dB

Applications

Mobile phones
PDAs
Portable electronic devices

Diagrams

Typical Application
click for larger image


Connection Diagram
click for larger image



Typical Performance
click for larger image



Prev:LM4671 Filterless High Efficiency 2.5W Switching Audio Amplifier
Next:ADC084S051 4 Channel, 200 ksps to 500 ksps, 8-Bit A/D Converter from the PowerWise® Family


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