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LM4801 Datasheet

  • LM4801

  • National Semiconductor [1W Stereo Audio Amplifier Plus Adju...

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  • NSC

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LM4801 1W Stereo Audio Amplifier Plus Adjustable LDO
September 2003
LM4801
1W Stereo Audio Amplifier Plus Adjustable LDO
General Description
The LM4801 combines a bridge-connected (BTL) stereo
audio power amplifier with a low dropout voltage regulator
(LDO). The audio amplifier delivers 1.0W to a 8鈩?load with a
less than 1.0% THD+N while operating on a 5V power
supply.
With the LM4801鈥檚 adjustable low-dropout (LDO) CMOS
linear regulator delivers an output current of up to 300mA,
has shutdown mode (1nA, typ) low quiescent current (90碌A,
typ) and LDO voltage (120mV, typ). The regulator is stable
with small ceramic capacitive load (2.2碌F, typ). The regulator
includes regulation fault detection, a bandgap voltage refer-
ence, and constant current limiting. It is designed for low
power, low current applications that can take advantage of
its 300mA output current capability.
The LM4801 features an externally controlled micropower
shutdown mode and thermal shutdown protection. It also
utilizes circuitry that reduces "clicks and pops" during device
turn-on and return from shutdown.
Boomer audio power amplifiers are designed specifically to
use few external components and provide high quality output
power in a surface mount package.
Key Specifications
n
n
n
n
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n
n
n
n
P
O
(BTL): V
DD
= 5V, THD+N
鈮?/div>
1%, R
L
= 8鈩?1.0W(typ)
Power supply range (amplifier)
3.0V to 5.0V
Power supply range (LDO)
2.5V to 6.0V
Shutdown current
0.07碌A (typ)
LDO output current
300mA (min)
LDO dropout voltage (I
OUT
= 300mA)
120mV (typ)
LDO quiescent supply current
90碌A (typ)
LDO shutdown supply current
1nA (typ)
LDO PSRR
60dB
LDO turn-on time
120ms (typ)
LDO ouput noise-voltage
37碌V
RMS
(typ)
Features
n
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Stereo BTL amplifier
Adjustable LDO regulator
鈥淐lick and pop鈥?suppression circuitry
LDO is stable with small-value ceramic output capacitors
Unity-gain stable audio amplifiers
LDO has over-current protection
Thermal shutdown protection circuitry
TSSOP (MH) package
Applications
n
Multimedia monitors
n
Portable and desktop computers
n
Portable televisions
Connection Diagram
20073629
Top View
Order Number LM4801MH
See NS Package Number MXA28A for TSSOP
Boomer
庐
is a registered trademark of National Semiconductor Corporation.
漏 2003 National Semiconductor Corporation
DS200736
www.national.com

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