參數(shù)資料
型號(hào): LM4901IBP
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類(lèi): 音頻/視頻放大
英文描述: 1.05 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9
封裝: MICRO, SMD-9
文件頁(yè)數(shù): 1/21頁(yè)
文件大?。?/td> 1074K
代理商: LM4901IBP
LM4901
1 Watt Audio Power Amplifier with Selectable Shutdown
Logic Level
General Description
The LM4901 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
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 LM4901 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 LM4901 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by either
logic high or low depending on mode selection. Driving the
shutdown mode pin either high or low enables the shutdown
pin to be driven in a likewise manner to enable shutdown.
The LM4901 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4901 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j Improved PSRR at 217Hz & 1KHz
62dB
j Power Output at 5.0V & 1% THD
1.0W(typ.)
j Power Output at 3.0V & 1% THD
375mW(typ.)
j Shutdown Current
0.1A(typ.)
Features
n
Available in space-saving packages: micro SMD and
MSOP
n
Ultra low current shutdown mode
n
BTL output can drive capacitive loads
n
Improved pop & click circuitry eliminates noise during
turn-on and turn-off transitions
n
2.0 - 5.5V operation
n
No output coupling capacitors, snubber networks or
bootstrap capacitors required
n
Unity-gain stable
n
External gain configuration capability
n
User select shutdown High or Low
Applications
n
Mobile Phones
n
PDAs
n
Portable electronic devices
Typical Application
Boomer is a registered trademark of National Semiconductor Corporation.
DS200198-1
FIGURE 1. Typical Audio Amplifier Application Circuit
December 2001
LM4901
1
W
att
Audio
Power
Amplifier
with
Selectable
Shutdown
Logic
Level
2001 National Semiconductor Corporation
DS200198
www.national.com
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