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LM4954 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4954
Description  HIgh Voltage 3 Watt Audio Power Amplifier
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM4954
High Voltage 3 Watt Audio Power Amplifier
General Description
The LM4954 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 2.4 Watts of continuous average power to an 8
BTL load with less than 1% THD+N from a 7V
DC power
supply.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal number of
external components. The LM4954 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for lower-power portable applications where
minimal space and power consumption are primary require-
ments.
The LM4954 features a low-power consumption global shut-
down mode which is achieved by driving the shutdown pin
with logic low. Additionally, the LM4954 features an internal
thermal shutdown protection mechanism.
The LM4954 contains advanced pop & click circuitry which
eliminates noises that would otherwise occur during turn-on
and turn-off transitions.
The LM4954 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j Wide Power Supply
Voltage Range
2.7
≤ V
DD
≤ 9V
j Output Power: VDD = 7V, 1% THD+N
2.4W (typ)
j Quiescent power supply current
3mA (typ)
j PSRR: VDD = 5V and 3V at 217Hz
80dB (typ)
j Shutdown power supply current
0.01µA (typ)
Features
n
No output coupling capacitors, snubber networks or
bootstrap capacitors required
n
Unity gain stable
n
Externally configurable gain
n
Ultra low current active low shutdown mode
n
BTL output can drive capacitive loads up to 100pF
n
“Click and pop” suppression circuitry
n
2.7V - 9.0V operation
n
Available in space-saving microSMD package
Applications
n
Mobile Phones
n
PDAs
Typical Application
Boomer® is a registered trademark of National Semiconductor Corporation.
20129111
FIGURE 1. Typical Audio Amplifier Application Circuit
June 2005
© 2005 National Semiconductor Corporation
DS201291
www.national.com




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