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LM4892M Datasheet

  • LM4892M

  • National Semiconductor [1 Watt Audio Power Amplifier with H...

  • NSC

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LM4892 1 Watt Audio Power Amplifier with Headphone Sense
October 2002
LM4892
1 Watt Audio Power Amplifier with Headphone Sense
General Description
The LM4892 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. Switching between bridged speaker mode and
headphone (single-ended) mode is accomplished using the
headphone sense pin.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4892 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 LM4892 features a low-power consumption shutdown
mode, which is achieved by driving the shutdown pin with
logic low. Additionally, the LM4892 features an internal ther-
mal shutdown protection mechanism.
The LM4892 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4892 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
62dB (typ)
1.0W (typ)
400mW (typ)
0.1碌A(chǔ) (typ)
j
Power Output at 5.0V & 1% THD
j
Power Output at 3.3V & 1% THD
j
Shutdown Current
Features
n
Available in space-saving packages: LLP, micro SMD,
MSOP, and SOIC
n
Ultra low current shutdown mode
n
BTL output can drive capacitive loads up to 500pF
n
Improved pop & click circuitry eliminates noise during
turn-on and turn-off transitions
n
2.2 - 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
n
Headphone amplifier mode
Applications
n
Mobile Phones
n
PDAs
n
Portable electronic devices
Typical Application
20012701
FIGURE 1. Typical Audio Amplifier Application Circuit (Pin #鈥檚 apply to M & MM packages)
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2002 National Semiconductor Corporation
DS200127
www.national.com

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