LM4674ATL Datasheet

IC型號：
LM4674ATL
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National Semiconductor [Filterless 2.5W Stereo Class D Audi...
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LM4674A Filterless 2.5W Stereo Class D Audio Power Amplifier

September 2006

LM4674A

Filterless 2.5W Stereo Class D Audio Power Amplifier

General Description

The LM4674A is a single supply, high efficiency, 2.5W/

channel, filterless switching audio amplifier. A low noise

PWM architecture eliminates the output filter, reducing ex-

ternal component count, board area consumption, system

cost, and simplifying design.

The LM4674A is designed to meet the demands of mobile

phones and other portable communication devices. Operat-

ing from a single 5V supply, the device is capable of deliv-

ering 2.5W/channel of continuous output power to a 4鈩?load

with less than 10% THD+N. Flexible power supply require-

ments allow operation from 2.4V to 5.5V.

The LM4674A features high efficiency compared to conven-

tional Class AB amplifiers. When driving an 8鈩?speaker from

a 3.6V supply, the device features 85% efficiency at P

500mW. Four gain options are pin selectable through the

GAIN0 and GAIN1 pins.

Output short circuit protection prevents the device from be-

ing damaged during fault conditions. Superior click and pop

suppression eliminates audible transients on power-up/down

and during shutdown. Independent left/right shutdown con-

trols maximizes power savings in mixed mono/stereo appli-

cations.

Key Specifications

Efficiency at 3.6V, 100mW into 8鈩?/div>

Efficiency at 3.6V, 500mW into 8鈩?/div>

Efficiency at 5V, 1W into 8鈩?/div>

Quiescent Power Supply Current

80% (typ)

85% (typ)

4mA

2.5W (typ)

1.5W (typ)

0.1碌A(chǔ) (typ)

at 3.6V supply

Power Output at V

= 5V,

= 4鈩? THD

鈮?/div>

10%

Power Output at V

= 5V,

= 8鈩? THD

鈮?/div>

10%

Shutdown current

Features

Output Short Circuit Protection

Stereo Class D operation

No output filter required

Logic selectable gain

Independent shutdown control

Minimum external components

Click and Pop suppression

Micro-power shutdown

Available in space-saving 2mm x 2mm x 0.6mm micro

SMD package

Applications

Mobile phones

PDAs

Laptops

Boomer

廬

is a registered trademark of National Semiconductor Corporation.

漏 2006 National Semiconductor Corporation

DS201961

www.national.com

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