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LM4905LQ Datasheet

  • LM4905LQ

  • National Semiconductor [1 Watt Audio Power Amplifier]

  • 683.21KB

  • NSC

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LM4905 1 Watt Audio Power Amplifier
July 2003
LM4905
1 Watt Audio Power Amplifier
General Description
The LM4905 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 LM4905 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 LM4905 features a low-power consumption shutdown
mode, which is achieved by driving the shutdown pin with
logic low. Additionally, the LM4905 features an internal ther-
mal shutdown protection mechanism.
The LM4905 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4905 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j
Improved PSRR at 217Hz & 1KHz
j
Power Output at 5.0V, 1% THD, 8鈩?/div>
j
Power Output at 3.0V, 1% THD, 8鈩?/div>
j
Shutdown Current
62dB
1.07W (typ)
390mW (typ)
0.1碌A (typ)
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
Typical Application
200508D3
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
庐
is a registered trademark of National Semiconductor Corporation.
漏 2003 National Semiconductor Corporation
DS200508
www.national.com

LM4905LQ 产品属性

  • 1

  • 1W

  • -40°C 到 +85°C

  • 28

  • No SVHC (19-Dec-2011)

  • 1.07W

  • 4905

  • LLP

  • -40°C

  • 85°C

  • 2

  • 功率

  • 5.5V

  • 2.2V

  • 表面安装

  • 8ohm

  • 6V

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