SA471-033
LOW DROPOUT VOLTAGE REGULATOR(1.0A)
DESCRIPTION
The SA471-033 low dropout linear regulator will provide a fixed output
voltage from a fluctuating DC input voltage. The Maximum current
capacity is 1A.
TO-252-2L
FEATURE
* Current limit protection
* Thermal shutdown protection
* Build-in overvoltage protection circuit
TO-220-3L
APPLICATION
* Constant regulation for power supply
ORDERING INFORMATIONS
Device
SA471-033
SA471-033A
Package
TO-252-2L
TO-220-3L
BLOCK DIAGRAM
ABOSOLUTE MAXIMUM RATINGS
(T
amb
=25°C)
Characteristics
Power Supply Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Peak applied voltage
Symbol
V
CC
P
D
T
opr
T
stg
V
surge
Ratings
35
2000*
-40~+85
-55~+150
50**
Unit
V
mW
°C
°C
V
*Reduce by 16mW for each increase in Ta of 1°C over 25°C.
** Voltage application time: 200 msec or less.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Rev: 1.0
2004.03.11
Page 1 of 4
SA471-033
ELECTRICAL CHARACTERISTICS
(Unless other specified, T
amb
=25°C, V
CC
=8V, I
O
=500mA)
Characteristics
Input Voltage
Output Current
Output Voltage
Input Stability
Ripple Rejection Ratio
Load regulation
Temperature Coefficient Of
Output Voltage
Dropout Voltage
Bias Current
Peak Output Current
Output Short-circuit Current
Symbol
V
CC
I
O
V
O
R
eg.I
R.R.
R
eg.L
Tc
vo
V
d
I
b
I
o-p
I
os
-
-
-
V
CC
: 4.3V to 25V
θ
in
=1V
rms
,f=120Hz,I
o
=100mA
I
o
= 5mA to 1A
I
o
=5mA, T
j
=0~125°C
V
CC
=0.95Vo
I
O
=0mA
T
j
=25°C
V
CC
=25V
Test conditions
Min.
4.3
-
3.13
-
45
--
-
-
-
1.0
-
Typ.
-
-
3.3
20
55
50
±0.02
0.3
2.5
1.5
0.4
Max.
25
1
3.47
100
-
150
-
0.5
5
-
-
Unit
V
A
V
mV
dB
mV
%/°C
V
mA
A
A
PIN CONFIGURATIONn
PIN DESCRIPTION
Pin No.
1
2
3
Pin Name
V
CC
GND
V
OUT
Input voltage
Regulator ground
Regulated output voltage
Description
FUNCTION DESCRIPTION
The SA471-033 low dropout linear regulator provides fixed output voltage at currents up to 1A. It contains
output current limiting, thermal shutdown protection and overvoltage protection.
INPUT, OUTPUT CAPACITOR AND STABILITY
An input bypass capacitor is recommended to improve transient response. This will reduce the circuit’
s
sensitivity to the input line impedance at high frequencies and significantly enhance the output transient response.
The bypass capacitor should be mounted with shortest possible lead or track length directly across the regulator’
s
input terminals and GND.
The output capacitor is required for stability. Since fluctuations in the value of the capacitor due to temperature
changes may cause oscillation, a tantalum electrolytic capacitor with a small internal series resistance (ESR) is
recommended. A 22µF capacitor is recommended; however, be aware that if an extremely large capacitance is
used (1000µF or greater), then oscillations may occur at low frequencies. Therefore, be sure to perform the
appropriate verifications before selecting the capacitor.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Rev: 1.0
2004.03.11
Page 2 of 4
SA471-033
TYPICAL APPLICATION CIRCUIT
Note:The circuit and parameters are reference only, please set the parameters of the real application circuit
based on the real test .
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Rev: 1.0
2004.03.11
Page 3 of 4
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