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LM4992SD Datasheet

  • LM4992SD

  • 420mW Stereo Cell Phone Audio Amplifier

  • 16頁

  • NSC

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LM4992 420mW Stereo Cell Phone Audio Amplifier
February 2004
LM4992
420mW Stereo Cell Phone Audio Amplifier
General Description
The LM4992 is a stereo audio power amplifier primarily
designed for demanding applications in mobile phones and
other portable communication device applications. It is ca-
pable of delivering 1 watt, per channel, of continuous aver-
age 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 LM4992 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 LM4992 features independent shutdown control for
each channel and a low-power consumption shutdown
mode, which is achieved by driving both shutdown pins with
logic low. Additionally, the LM4992 features an internal ther-
mal shutdown protection mechanism.
The LM4992 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4992 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j
Improved PSRR at 217Hz & 1KHz
j
Stereo Output Power at 5.0V,
64dB (1KHz)
1.07W (typ)
420mW (typ)
0.2碌A(chǔ) (typ)
1% THD, 8鈩?/div>
j
Stereo Output Power at 3.3V,
1% THD, 8鈩?/div>
j
Shutdown Current, V
dd
= 3.3V
Features
n
n
n
n
n
n
n
n
Available in space-saving LLP 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
2.2 - 5.5V operation
No output coupling capacitors, snubber networks or
bootstrap capacitors required
Unity-gain stable
External gain configuration capability
Applications
n
Mobile Phones
n
PDAs
n
Portable electronic devices
Connection Diagram
SDA14A
200761E6
Top View
Order Number LM4992SD
See NS Package Number SDA14A
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2004 National Semiconductor Corporation
DS200761
www.national.com

LM4992SD 產(chǎn)品屬性

  • National Semiconductor (TI)

  • Class-AB

  • 1.07 W x 2 at 8 Ohms

  • 2-Channel Stereo

  • 0.15 %

  • 3 V, 5 V

  • + 85 C

  • LLP EP

  • Reel

  • 8 Ohms

  • Single

  • - 40 C

  • Differential

  • Single

  • 5.5 V

  • 2.2 V

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