LM4673, LM4673SDBD, LM4673TMBD

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SNAS317D – DECEMBER 2005 – REVISED MAY 2013

LM4673

Filterless, 2.65W, Mono, Class D Audio Power

Amplifier

Check for Samples: LM4673, LM4673SDBD, LM4673TMBD

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FEATURES

DESCRIPTION

The LM4673 is a single supply, high efficiency,

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•

Mono Class D Operation

2.65W, mono, Class D audio amplifier. A low noise,

•

No Output Filter Required for Inductive Loads

filterless PWM architecture eliminates the output filter,

•

Externally Configurable Gain

reducing external component count, board area

consumption, system cost, and simplifying design.

•

Very Fast Turn On Time: 17

μs (typ)

•

Minimum External Components

The LM4673 is designed to meet the demands of

mobile phones and other portable communication

•

"Click and Pop" Suppression Circuitry

devices. Operating on a single 5V supply, it is

•

Micro-Power Shutdown Mode

capable of driving a 4

Ω speaker load at a continuous

•

Available in Space-Saving 0.4mm Pitch

average output of 2.1W with less than 1% THD+N. Its

DSBGA and WSON Packages

flexible power supply requirements allow operation

from 2.4V to 5.5V.

APPLICATIONS

The LM4673 has high efficiency with speaker loads

compared to a typical Class AB amplifier. With a 3.6V

•

Mobile Phones

supply driving an 8

Ω speaker, the IC's efficiency for a

•

PDAs

100mW power level is 80%, reaching 88% at 400mW

•

Portable Electronic Devices

output power.

The LM4673 features a low-power consumption

KEY SPECIFICATIONS

shutdown mode. Shutdown may be enabled by

•

Efficiency at 3.6V, 400mW into 8

Ω Speaker

driving the Shutdown pin to a logic low (GND).

88% (typ)

The gain of the LM4673 is externally configurable

•

Efficiency at 3.6V, 100mW into 8

Ω Speaker

which allows independent gain control from multiple

80% (typ)

sources by summing the signals. Output short circuit

and thermal overload protection prevent the device

•

Efficiency at 5V, 1W into 8

Ω Speaker 86% (typ)

from damage during fault conditions.

•

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

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PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

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