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LM4674ATL Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM4674ATL
Descripción Electrónicos  Filterless 2.5W Stereo Class D Audio Power Amplifier
Download  18 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4674ATL Datasheet(HTML) 1 Page - National Semiconductor (TI)

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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
Ω 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
Ω 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
80% (typ)
j Efficiency at 3.6V, 500mW into 8
85% (typ)
j Efficiency at 5V, 1W into 8
85% (typ)
j Quiescent Power Supply Current
at 3.6V supply
4mA
j Power Output at VDD = 5V,
R
L =4
Ω, THD ≤ 10%
2.5W (typ)
j Power Output at VDD = 5V,
R
L =8
Ω, THD ≤ 10%
1.5W (typ)
j Shutdown current
0.1µA (typ)
Features
n
Output Short Circuit Protection
n
Stereo Class D operation
n
No output filter required
n
Logic selectable gain
n
Independent shutdown control
n
Minimum external components
n
Click and Pop suppression
n
Micro-power shutdown
n
Available in space-saving 2mm x 2mm x 0.6mm micro
SMD package
Applications
n
Mobile phones
n
PDAs
n
Laptops
Boomer® is a registered trademark of National Semiconductor Corporation.
September 2006
© 2006 National Semiconductor Corporation
DS201961
www.national.com


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