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LM4891M Datasheet

  • LM4891M

  • National Semiconductor [1 Watt Audio Power Amplifier]

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  • NSC

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LM4891 1 Watt Audio Power Amplifier
October 2002
LM4891
1 Watt Audio Power Amplifier
General Description
The LM4891 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 watt 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 LM4891 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 LM4891 features a low-power consumption shutdown
mode, which is achieved by driving the shutdown pin with
logic high. Additionally, the LM4891 features an internal ther-
mal shutdown protection mechanism.
The LM4891 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4891 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j
PSRR at 217Hz, V
DD
= 5V, 8鈩?Load
j
Power Output at 5.0V & 1% THD
j
Power Output at 3.3V & 1% THD
j
Shutdown Current
62dB (typ)
1.0W (typ)
400mW (typ)
0.1碌A (typ)
Features
n
Available in space-saving packages: micro SMD, MSOP,
SOIC, and LLP
n
Ultra low current shutdown mode
n
BTL output can drive capacitive loads
n
Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n
2.2 to 5.5V operation
n
No output coupling capacitors, snubber networks or
bootstrap capacitors required
n
Thermal shutdown protection
n
Unity-gain stable
n
External gain configuration capability
Applications
n
Mobile Phones
n
PDAs
n
Portable electronic devices
Typical Application
20007401
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
庐
is a registered trademark of National Semiconductor Corporation.
漏 2002 National Semiconductor Corporation
DS200074
www.national.com

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