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LM4907 Datasheet

  • LM4907

  • National Semiconductor [1 Watt Audio Power Amplifier]

  • 1059.65KB

  • NSC

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LM4907 1 Watt Audio Power Amplifier
April 2005
LM4907
1 Watt Audio Power Amplifier
General Description
The LM4907 is an audio power amplifier primarily designed
for demanding applications in mobile phones and other por-
table communication device applications. It is capable of
delivering 1 Watt of continuous average power to an 8鈩?BTL
load with less than 1% 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 LM4907 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 LM4907 features a low-power consumption shutdown
mode which is achieved by driving the shutdown pin with
logic low. Additionally, the LM4907 features an internal ther-
mal shutdown protection mechanism.
The LM4907 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4907 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j
Improved PSRR at 217Hz & 1KHz
j
Power Output at 5.0V, 1% THD+N, 8鈩?/div>
j
Power Output at 3.0V, 1% THD+N, 8鈩?/div>
j
Shutdown Current
62dB
1.0W (typ)
390mW (typ)
0.1碌A(chǔ) (typ)
Features
n
n
n
n
n
n
n
n
Available in space-saving LLP package
Ultra low current shutdown mode
BTL output can drive capacitive loads
Improved pop & click circuitry eliminates noise during
turn-on and turn-off transitions
2.2 - 5.5V operation
No output coupling capacitors, snubber networks or
bootstrap capacitors required
Unity-gain stable
External gain configuration capability
Applications
n
Mobile Phones
n
PDAs
n
Portable electronic devices
Typical Application
200870D3
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS200870
www.national.com

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