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LM4928SDX Datasheet

  • LM4928SDX

  • IC 2.2 W, 2 CHANNEL, AUDIO AMPLIFIER, DSO14, LLP-14, Audio/V...

  • 20頁(yè)

  • NSC

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LM4928 1.2 Watt Stereo Fully Differential Audio Power Amplifier with RF Suppression and
Shutdown Low
February 2006
LM4928
1.2 Watt Stereo Fully Differential Audio Amplifier with RF
Suppression and Shutdown Low
General Description
The LM4928 is an stereo fully differential stereo audio power
amplifier primarily designed for demanding applications in
mobile phones and other portable communication devices. It
is capable of delivering 1.2 watts of continuous average
power to a 8鈩?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 LM4928 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 LM4928 features a low-power consumption shutdown
mode. To facilitate this, shutdown may be enabled by logic
low. Additionally, the LM4928 features an internal thermal
shutdown protection mechanism.
The LM4928 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
Key Specifications
j
Improved PSRR at 217Hz
j
Output Power at 5.0V
@
1% THD+N (8鈩?
j
Shutdown Current
90dB (typ)
1.2W (typ)
0.1碌A(chǔ) (typ)
j
Output Power at 3.0V
@
1% THD+N (8鈩?400mW (typ)
Features
RF Suppression Circuitry
Fully differential amplification
Available in space-saving micro SMD and LLP packages
Ultra low current shutdown mode
Can drive capacitive loads up to 100pF
Improved pop & click circuitry eliminates noises 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
n
n
n
n
n
Applications
n
Mobile phones
n
PDAs
n
Portable electronic devices and accessories
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2006 National Semiconductor Corporation
DS201600
www.national.com

LM4928SDX 產(chǎn)品屬性

  • National Semiconductor (TI)

  • Class-AB

  • 2.2 W x 2 at 4 Ohms

  • 2-Channel Stereo

  • 50 dB

  • 0.04 %

  • 3 V, 5 V

  • + 85 C

  • LLP EP

  • Reel

  • 8 Ohms

  • Differential

  • - 40 C

  • Differential

  • Single

  • 5.5 V

  • 2.4 V

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