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LM4817 Datasheet

  • LM4817

  • 1W Stereo Audio Amplifier Plus Adjustable Output Limiter Plu...

  • 733.25KB

  • 21頁

  • NSC

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LM4817 1W Stereo Audio Amplifier Plus Adjustable Output Limiter Plus Adjustable LDO
March 2004
LM4817
1W Stereo Audio Amplifier Plus Adjustable Output
Limiter Plus Adjustable LDO
General Description
The LM4817 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 V
LIM
set to 1.0V, the amplifier outputs are
clamped to 6V
p-p
,
鹵
800mV.
With the LM4817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(chǔ),
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 LM4817 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
n
n
n
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 5.5V
Power supply range (LDO)
2.5V to 6.0V
Shutdown current
0.07碌A(chǔ) (typ)
LDO output current
300mA (min)
LDO dropout voltage (I
OUT
= 300mA)
120mV (typ)
LDO quiescent supply current
90碌A(chǔ) (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
n
n
n
n
n
n
n
n
Stereo BTL amplifier
Adjustable output voltage magnitude limiter
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
20078129
Top View
Order Number LM4817MH
See NS Package Number MXA28A for TSSOP
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2004 National Semiconductor Corporation
DS200781
www.national.com

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