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National Semiconductor Electronic Components Datasheet

LM4995 Datasheet

1.3W Audio Power Amplifier

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September 2007
LM4995
1.3 W Audio Power Amplifier
General Description
The LM4995 is an audio power amplifier primarily designed
for demanding applications in mobile phones and other
portable communication device applications. It is capable of
delivering 1.2W of continuous average power to an 8BTL
load with less than 1% distortion (THD+N) from a 5VDC power
supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
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The LM4995 does not require output
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
■ PSRR at 3.6V (217Hz & 1kHz)
■ 
Output Power at 5.0V, 1% THD+N, 8
■ 
Output Power at 3.6V, 1% THD+N, 8
■ Shutdown Current
75dB
1.3W (typ)
625mW (typ)
0.01µA (typ)
Features
Available in space-saving 0.4mm pitch μSMD 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
LLP package: 0.5mm pitch, 3 x 3 mm
Applications
Mobile Phones
PDAs
Portable electronic devices
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation 201599
www.national.com


National Semiconductor Electronic Components Datasheet

LM4995 Datasheet

1.3W Audio Power Amplifier

No Preview Available !

Typical Application
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201599d3
FIGURE 1. Typical Audio Amplifier Application Circuit
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2


Part Number LM4995
Description 1.3W Audio Power Amplifier
Maker National Semiconductor
Total Page 18 Pages
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