LM4674 Filterless 2.5W Stereo Class D Audio Power Amplifier
December 2005
LM4674
Filterless 2.5W Stereo Class D Audio Power Amplifier
General Description
The LM4674 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 LM4674 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 LM4674 features high efficiency compared to conven-
tional Class AB amplifiers. When driving and 8鈩?speaker
from a 3.6V supply, the device features 85% efficiency at P
O
= 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
j
Efficiency at 3.6V, 100mW into 8鈩?/div>
j
Efficiency at 3.6V, 500mW into 8鈩?/div>
j
Efficiency at 5V, 1W into 8鈩?/div>
j
Quiescent Power Supply Current
80% (typ)
85% (typ)
85% (typ)
4mA
2.5W (typ)
1.5W (typ)
0.1碌A (typ)
at 3.6V supply
j
Power Output at V
DD
= 5V,
R
L
= 4鈩? THD
鈮?/div>
10%
j
Power Output at V
DD
= 5V,
R
L
= 8鈩? THD
鈮?/div>
10%
j
Shutdown current
Features
n
n
n
n
n
n
n
n
n
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
n
Mobile phones
n
PDAs
n
Laptops
Boomer
庐
is a registered trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS201674
www.national.com
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