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LM4927 Datasheet

  • LM4927

  • National Semiconductor [2.5 Watt Fully Differential Audio P...

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LM4927 2.5 Watt Fully Differential Audio Power Amplifier With Shutdown
April 2006
LM4927
2.5 Watt Fully Differential Audio Power Amplifier With
Shutdown
General Description
The LM4927 is a fully differential audio power amplifier
primarily designed for demanding applications in mobile
phones and other portable communication device applica-
tions. It is capable of delivering 2.5 watts of continuous
average power to a 4鈩?load with less than 10% distortion
(THD+N) from a 5V
DC
power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4927 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4927 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by logic
low. Additionally, the LM4927 features an internal thermal
shutdown protection mechanism.
The LM4927 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
Key Specifications
j
Improved PSRR at 217Hz
j
Power Output at 5.0V
@
10% THD (4鈩?
j
Power Output at 3.3V
@
1% THD
j
Shutdown Current
85dB (typ)
2.5W (typ)
550mW (typ)
0.1碌A (typ)
Features
Fully differential amplification
Available in space-saving micro-array LLP package
Ultra low current shutdown mode
Can drive capacitive loads up to 100pF
Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n
2.4 - 5.5V operation
n
No output coupling capacitors, snubber networks or
bootstrap capacitors required
n
n
n
n
n
Applications
n
Mobile phones
n
PDAs
n
Portable electronic devices
Typical Application
20152529
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
庐
is a registered trademark of National Semiconductor Corporation.
漏 2006 National Semiconductor Corporation
DS201525
www.national.com

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