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LM4995 Datasheet

  • LM4995

  • BOOMER-R AUDIO POWER AMPLIFIER SERIES

  • 15頁

  • NSC

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LM4995 1.3 Watt Audio Power Amplifier
April 2006
LM4995
1.3 Watt Audio Power Amplifier
General Description
The LM4995 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 1.3W 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 LM4995 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 LM4995 features a low-power consumption shutdown
mode, which is achieved by driving the shutdown pin with
logic low. Additionally, the LM4995 features an internal ther-
mal shutdown protection mechanism.
The LM4995 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4995 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j
PSRR at 3.6V (217Hz & 1kHz)
j
Output Power at 5.0V, 1% THD, 8鈩?/div>
j
Output Power at 3.6V, 1% THD, 8鈩?/div>
j
Shutdown Current
75dB
1.3W (typ)
625mW (typ)
0.01碌A (typ)
Features
n
n
n
n
n
n
n
n
Available in space-saving 0.4mm pitch 碌SMD 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
2.4 - 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
201599D3
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2006 National Semiconductor Corporation
DS201599
www.national.com

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