LM4995_07 Datasheet, PDF (1/18 Pages) National Semiconductor (TI) – 1.3W Audio Power Amplifier

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 8Ω 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
■ PSRR at 3.6V (217Hz & 1kHz)
■ 
Output Power at 5.0V, 1% THD+N, 8Ω
■ 
Output Power at 3.6V, 1% THD+N, 8Ω
■ 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}
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© 2007 National Semiconductor Corporation 201599
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