LM48411 Ultra-Low EMI, Filterless, 2.5W, Stereo, Class D Audio Power Amplifier with E
鈥?/div>
Ultra-Low EMI, Filterless, 2.5W, Stereo, Class D Audio
Power Amplifier with E
2
S
General Description
The LM48411 is a single supply, high efficiency, 2.5W/chan-
nel Class D audio amplifier. The LM48411 features National's
Enhanced Emissions Suppression (E
2
S) system, that fea-
tures a unique patent-pending ultra low EMI, spread spec-
trum, PWM architecture, that significantly reduces RF emis-
sions while preserving audio quality and efficiency. The E
2
S
system improves battery life, reduces external component
count, board area consumption, system cost, and simplifying
design.
The LM48411 is designed to meet the demands of mobile
phones and other portable communication devices. Operat-
ing on a single 5V supply, it is capable of delivering 2.5W/
channel of continuous output power to a 4鈩?load with less
than 10% THD+N. Its flexible power supply requirements al-
low operation from 2.4V to 5.5V. The wide band spread
spectrum architecture of the LM48411 reduces EMI-radiated
emissions due to the modulator frequency.
The LM48411 features high efficiency compared to a con-
ventional Class AB amplifier. The E
2
S system includes an
advanced, patent-pending edge rate control (ERC) architec-
ture that further reduce emissions by minimizing the high
frequency component of the device output, while maintaining
high quality audio reproduction and high efficiency (畏 = 87%
at V
DD
= 3.6V, P
O
= 500mW). Four gain options are pin se-
lectable through GAIN0 and GAIN1 pins.
The LM48411 features a low-power consumption shutdown
mode. Shutdown may be enabled by driving the Shutdown
pin to a logic low (GND).
Output short circuit protection prevents the device from being
damaged during fault conditions. Superior click and pop sup-
pression eliminates audible transients on power up/down and
during shutdown. Independent left/right shutdown control
maximizes power savings in mixed mono/stereo applications.
Key Specifications
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Efficiency at 3.6V, 500mW into 8鈩?/div>
speaker
87% (typ)
80% (typ)
88% (typ)
4.2mA (typ)
2.5W (typ)
1.5W (typ)
0.01碌A(chǔ) (typ)
2.4V to 5.5V
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Efficiency at 3.6V, 100mW into 8鈩?/div>
speaker
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Efficiency at 5V, 1W into 8鈩?/div>
speaker
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Quiescent current, 3.6V supply
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Power Output at V
DD
= 5V
R
L
= 4鈩?
THD
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10%
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Power Output at V
DD
= 5V
R
L
= 8鈩?
THD
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10%
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Total shutdown power supply
current
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Single supply range
Features
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E
2
S system reduces EMI preserving Audio Quality and
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鈻?/div>
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Efficiency
Output short circuit protection
Stereo Class D Operation
No output filter required for inductive loads
Logic selectable gain
Independent shutdown control
Minimum external components
"Click and pop" suppression circuitry
Micro-power shutdown mode
Available in space-saving 0.5mm pitch micro SMD
package
Applications
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Mobile phones
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PDAs
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Portable electronic devices
Boomer廬 is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
300095
www.national.com
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