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LM48510_0710 Datasheet

  • LM48510_0710

  • National Semiconductor [Boosted Class D Audio Power Amplifi...

  • NSC

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LM48510 Boosted Class D Audio Power Amplifier
October 2007
LM48510
Boosted Class D Audio Power Amplifier
General Description
The LM48510 integrates a boost converter with a high effi-
ciency mono, Class D audio power amplifier to provide 1.2W
continuous power into an 8鈩?speaker when operating on a
3.3V power supply with boost voltage (PV
1
) of 5.0V. When
operating on a 3.3V power supply, the LM48510 is capable of
driving a 4鈩?speaker load at a continuous average output of
1.7W with less than 1% THD+N. The Class D amplifier is a
low noise, filterless PWM architecture that eliminates the out-
put filter, reducing external component count, board area
consumption, system cost, and simplifying design.
The LM48510's switching regulator is a current-mode boost
converter operating at a fixed frequency of 0.6MHz.
The LM48510 is designed for use in mobile phones and other
portable communication devices. The high (76%) efficiency
extends battery life when compared to Boosted Class AB am-
plifiers. The LM48510 features a low-power consumption
shutdown mode. Shutdown may be enabled by driving the
Shutdown pin to a logic low (GND).
The gain of the Class D is externally configurable which allows
independent gain control from multiple sources by summing
the signals. Output short circuit and Thermal shutdown pro-
tection prevent the device from damage during fault condi-
tions. Superior click and pop suppression eliminates audible
transients during power-up and shutdown.
Key Specifications
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Quiescent Power Supply Current
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Output Power
(R
L
= 8鈩?
THD+N
鈮?/div>
1%,
V
DD
= 3.3V, PV
1
= 5.0V)
6mA (typ)
1.2W (typ)
0.01渭A
(typ)
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Shutdown Current
Features
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鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
Click and Pop Suppression
Low 0.01渭A Shutdown Current
76% Efficiency
Filterless Class D
2.7V - 5.0V operation (V
DD
)
Externally configurable gain on Class D
Very fast turn on time: 17渭s
Independent Boost and Amplifier shutdown pins
Applications
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鈻?/div>
鈻?/div>
Mobile Phones
PDAs
Portable media
Cameras
Handheld games
Typical Application
20123266
FIGURE 1. Typical LM48510 Audio Amplifier Application Circuit
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
201232
www.national.com

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