LM48310 Ultra-Low EMI, Filterless, 2.6W, Mono, Class D Audio Power Amplifier with E
鈥?/div>
Ultra-Low EMI, Filterless, 2.6W, Mono, Class D Audio
Power Amplifier with E
2
S
General Description
The LM48310 is a single supply, high efficiency, mono, 2.6W,
filterless switching audio amplifier. The LM48310 features
National鈥檚 Enhanced Emissions Suppression (E
2
S) system,
that features a unique patent-pending ultra low EMI, spread
spectrum, PWM architecture, that significantly reduces RF
emissions while preserving audio quality and efficiency. The
E
2
S system improves battery life, reduces external compo-
nent count, board area consumption, system cost, and sim-
plifying design.
The LM48310 is designed to meet the demands of portable
multimedia devices. Operating from a single 5V supply, the
device is capable of delivering 2.6W of continuous output
power to a 4鈩?load with less than 10% THD+N. Flexible power
supply requirements allow operation from 2.4V to 5.5V. The
LM48310 offers two logic selectable modulation schemes,
fixed frequency mode, and an EMI suppressing spread spec-
trum mode. The E
2
S system includes an advanced, patent-
pending edge rate control (ERC) architecture that further
reduce emissions by minimizing the high frequency compo-
nent of the device output, while maintaining high quality audio
reproduction (THD+N = 0.03%) and high efficiency (畏 = 88%).
The LM48310 also features a SYNC_IN input and
SYNC_OUT, which allows multiple devices to operate with
the same switching frequency, eliminating beat frequencies
and any other interference caused by clock intermodulation.
The LM48310 features high efficiency compared to conven-
tional Class AB amplifiers, and other low EMI Class D ampli-
fiers. When driving and 8鈩?speaker from a 5V supply, the
device operates with 88% efficiency at P
O
= 1W. The gain of
the LM48310 is internally set to 12dB, further reducing exter-
nal component count. A low power shutdown mode reduces
supply current consumption to 0.01渭A.
Advanced output short circuit protection with auto-recovery
prevents the device from being damaged during fault condi-
tions. Superior click and pop suppression eliminates audible
transients on power-up/down and during shutdown.
Key Specifications
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Efficiency at 3.6V, 400mW into 8鈩?/div>
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Efficiency at 5V, 1W into 8鈩?/div>
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Quiescent Power Supply Current at 5V
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Power Output at V
DD
= 5V,
R
L
= 4鈩?
THD+N
鈮?/div>
10%
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Power Output at V
DD
= 5V,
R
L
= 8鈩?
THD+N
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10%
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Shutdown current
85% (typ)
88% (typ)
3.2mA
2.6W (typ)
1.6W (typ)
0.01渭A
(typ)
Features
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Passes FCC Class B Radiated Emissions with 20 inches
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鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
of cable
E
2
S System Reduces EMI while Preserving Audio Quality
and Efficiency
Output Short Circuit Protection with Auto-Recovery
Stereo Class D operation
No output filter required
Internally Configured Gain (12dB)
Synchronizable Oscillator for Multi-Channel operation
Low power shutdown mode
Minimum external components
"Click and pop" suppression
Micro-power shutdown
Available in space-saving LLP package
Applications
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Mobile phones
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PDAs
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Laptops
EMI Graph 20in of Speaker Cable
300374a0
Boomer廬 is a registered trademark of National Semiconductor Corporation.
漏 2008 National Semiconductor Corporation
300374
www.national.com
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