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LM4995 Datasheet, PDF (1/15 Pages) National Semiconductor (TI) – BOOMER-R AUDIO POWER AMPLIFIER SERIES | |||
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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⦠BTL
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
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, 8â¦
j Output Power at 3.6V, 1% THD, 8â¦
j Shutdown Current
75dB
1.3W (typ)
625mW (typ)
0.01µA (typ)
Features
n Available in space-saving 0.4mm pitch µSMD package
n Ultra low current shutdown mode
n BTL output can drive capacitive loads
n Improved pop & click circuitry eliminates noise 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 Unity-gain stable
n 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® is a registered trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS201599
www.national.com
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