SU1117A
1A
Low Dropout
Positive
Elektronische Bauelemente
RoHS Compliant Product
Adjustable or
Fixed-Mode Regulator
Description
The SU1117A is a low dropout at positive adjustable or fixed-mode
regulator with min. of
1A
output current capability. The product is
specifically designed to provide well-regulated supply for low voltage
IC applications such as high-speed bus termination and low current
3.3V logic supply. SU1117A is also well suited for other applications
such as VGA cards. SU1117A is guaranteed to have lower than 1.4V
dropout at full load current making it ideal to provide well regulated
outputs of 1.25 to 5 with
6.4V
to 12V input supply.
Features
*
1.4V Max. Dropout Full Load Current
REF.
A
b
L4
c
L3
L1
E
* 3-Terminal Adjustable or Fixed 1.5V,1.8V,2.5V,3.3V,5.0V
* Output Current Limiting
* Good Noise Rejection
* Fast Transient Response
* Built-in Thermal Shutdown
Millimeter
REF.
Min.
Max.
4.40
4.80
c2
0.76
1.00
b2
0.00
0.30
B D
0.36
0.5
e
1.50 REF.
L
2.29
2.79
9.80
10.4
L2
Millimeter
Min.
Max.
1.25
1.45
1.17
1.47
8.6
9.0
2.54 REF.
14.6
15.8
0˚
8˚
1.27 REF.
Typical Circuit
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 1 of
4
SU1117A
Elektronische Bauelemente
1A
Low Dropout
Positive
Adjustable or
Fixed-Mode Regulator
Block Diagram
Pin Descriptions
Name
I/O
Pin#
Adj (GND)
Vout
Vin
I
O
I
1
2
3
Function
A resistor divider from this pin to the Vout pin and ground sets the output voltage (Ground
only for fixed mode)
The output of the regulator. A minimum of 10uF capacitor must be connected from this pin
to ground to insure stability.
The input pin of regulator .Typically a large storage capacitor is connected from this pin to
ground to insure that the input voltage does not sag below the minimum dropout voltage
during the load transient response .This pin must always be 1.3V higher than Vout in order
for the device to regulate properly.
Absolute Maximum Ratings
Parameter
DC Supply Voltage
Power Dissipation
Storage Temperature Range
Operating Juction Temperature Range
Symbol
V
IN
P
D
T
ST
T
OP
Ratings
-0.3 to 12
Internally Limited
-65~+150
0~+150
Unit
V
o
o
C
C
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page
2
of
4
SU1117A
Elektronische Bauelemente
1A
Low Dropout
Positive
Adjustable or
Fixed-Mode Regulator
Electrical Characteristics
PARAMETER
Reference Voltage
SU1117AADJ
SU1117A-1.5
SU1117A-1.8
Output Voltage
SU1117A-2.5
SU1117A-3.3
SU1117A-5.0
Line Regulation
SU1117A-XXX
SU1117AADJ
SU1117A-1.5
Load Regulation
SU1117A-1.8
SU1117A-2.5
SU1117A-3.3
SU1117A-5.0
Dropout Voltage
(V
IN
-V
OUT
)
Current Limit
Minimum Load Current
Thermal Regulation
Ripple Rejection
SU1117A-XXX
SU1117A-XXX
SU1117A-XXX
T
A
=25 ,30ms pulse
F=120HZ,C
OUT
=25uF Tantalum, I
OUT
=1A
SU1117A-XXX
V
IN
=V
OUT
+3V
-
-
-
-
60
0.5
91
10
70
-
-
-
dB
%
/w
/w
CONDITIONS
Io=10mA,Tj=25 ,(Vin-Vout )=1.5V
Io=10mA,Tj=25 ,3V Vin 12V
Io=10mA,Tj=25 ,3.3V Vin 12V
Io=10mA,Tj=25 ,4V Vin 12V
Io=10mA,Tj=25 ,4.8V Vin 12V
Io=10mA,Tj=25 ,6.5V Vin 12V
Io=10mA,Vout+1.5V<Vin<12V,Tj=25
Vin=3.3V,Vadj=0,0mA<Io<1A,Tj=25
(Note 1,2)
Vin=3V,0mA<Io<1A,TJ=25
Vin=3.3V,0mA<Io<1A,TJ=25
Vin=4V,0mA<Io<1A,TJ=25
Vin=5V,0mA<Io<1A,TJ=25
Vin=8V,0mA<Io<1A,TJ=25
Io=1A,( Vout=0.1% Vout)
Vin-Vout=5V
0
Tj 125
-
(Note 1,2)
(Note 1,2)
(Note 1,2)
(Note 1,2)
(Note 1,2)
MIN
1.225
1.470
1.764
2.450
3.235
4.900
-
-
-
-
-
-
-
-
1.1
-
TYP
1.25
1.500
1.800
2.500
3.300
5.000
-
-
12
15
20
26
40
1.3
-
5
0.008
MAX UNIT
1.275
1.530
1.836
2.550
3.365
5.100
0.2
1
15
18
25
33
50
1.4
-
10
V
V
V
V
V
V
%
%
mV
mV
mV
mV
mV
V
A
mA
0.04 %/W
Temperature Stability
I
O
=10mA
JA
Thermal Resistance
Junction–to-Ambient(No
heat sink ;No air flow)
JC
Thermal Resistance
Control Circuitry/Power Transistor
Junction-to-Case
Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation
are measured at a constant junction Temperature by low duty cycle pulse testing .Load regulation is measured at the
output lead =1/18” from the package.
Note 2: Line and load regulation are guaranteed up to the maximum power dissipation of 15W.Power dissipation is
determined by the difference between input and output and the output current .Guaranteed maximum power
dissipation will not be available over the full input/output range.
Note 3: Quiescent current is defined as the minimum output current required in maintaining regulation .At 12V input/output
differential the device is guaranteed to regulate if the output current is greater than 10mA.
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page
3
of
4
SU1117A
Elektronische Bauelemente
1A
Low Dropout
Positive
Adjustable or
Fixed-Mode Regulator
Characteristics Curve
h tp://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page
4
of
4
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