GS1117
Vishay Semiconductors
formerly General Semiconductor
Document Number 74802
www.vishay.com
20-Feb-02
1
New Product
800mA Low Dropout
Positive Adjustable Regulator
Description
The GS1117 is a low dropout three terminal regulator with
800mA output current capability. The output voltage is
adjustable with the use of a resistor divider. For fixed out-
put voltage versions, the output voltage is internally set at
2.5V, 2.85V, 3.3V or 5V. Dropout is guaranteed at a maxi-
mum of 1.4V at maximum output current. Its low dropout
voltage and fast transient response make it ideal for low
voltage microprocessor applications. Internal thermal limiting
provides protection against any overload condition that
would create excessive junction temperatures.
Applications
SCSI-2 Active Terminator
Post Regulator for Switching Supply
Battery Chargers
Constant-Current Regulators
PC Add-On Card
Mechanical Data
Case: TO-220AB, TO-263AB (D
2
PAK),
TO-252 (DPAK) and SOT-223
High temperature soldering guaranteed:
260C/10 seconds at terminals
Case outlines are on the back page
+
+
--
For
fixed
voltage
device
Thermal
Limit
Current
Amp
Current
Limit
GM
V
OUT
V
IN
ADJ
GND
V
REF
1.25V
55
A
Functional Block Diagram
Features
Dropout Voltage 1.2V at 800mA Output Current
Fast Transient Response
Line Regulation typically at 0.015%
Load Regulation typically at 0.1%
Internal thermal limiting
Adjustable Output Voltage or Fixed 2.5V, 2.85V, 3.3V, 5V
Standard 3-Pin Power Packages
TO-220AB
TO-263AB
(D
2
Pak)
GS1117CT
GS1117CM
GS1117CE
TO-252
(DPak)
1
2
3
1
2
3
1
2
3
GS1117CST
SOT-223
1
2
3
Pin Definition
1. Adjust/Gnd.
2. V
out (tab)
3. V
in
GS1117
Vishay Semiconductors
formerly General Semiconductor
www.vishay.com
Document Number 74802
2
20-Feb-02
Maximum Ratings and Thermal Characteristics
(T
A
= 25C unless otherwise noted)
Parameter
Symbol
Value
Unit
Vin Pin to ADJ/GND Pin
Vin
7
V
Thermal Resistance Junction to Case
TO-220AB
3.0
TO-252
R
JC
8.0
C/W
TO-263AB
3.0
SOT-223
15.0
Operating Junction Temperature Range
T
J
0 to +125
C
Storage Temperature Range
T
stg
65 to 150
C
Electrical Characteristics
(1)
T
J
= 25C
(2)
, V
IN
= 5V, I
o
= 10mA unless otherwise noted.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
T
J
= 25C
1.238
1.250
1.262
V
0C
T
J
125C 1.225
1.250
1.275
V
Reference Voltage
V
REF
2.65V
V
IN
7V
10mA
I
o
800mA
GS1117-2.5, V
IN
= 5V
2.48
2.5
2.53
V
GS1117-2.85, V
IN
= 5V
2.82
2.85
2.88
V
GS1117-3.3, V
IN
= 5V
3.26
3.30
3.33
V
Output Voltage
V
OUT
GS1117-5, V
IN
= 7V
4.95
5.00
5.05
V
GS1117
0.98V
N
V
N
1.02V
N
V
0C
T
J
125C
2.65V
V
IN
7V
10mA
I
o
800mA
2.65V
V
IN
7V
Line Regulation
REG
line
T
J
= 25C
0.015
0.2
% V
O
0C
T
J
125C
0.02
0.2
% V
O
10mA
I
o
800mA
Load Regulation
REG
load
T
J
= 25C
0.1
0.3
% V
O
0C
T
J
125C
0.2
0.4
% V
O
0C
T
J
125C
I
o
= 800mA
1.2
1.4
V
Dropout Voltage
V
DROP
I
o
= 500mA
1.19
1.35
V
I
o
= 100mA
1.15
1.30
V
Notes:
(1) All parameters, except nominal output voltage are specified for the variable voltage version, allowing a wider V
in
Range.
The specified limits also apply for the fixed voltage versions over the allowable input voltage range: GS1117-2.5 (3.9V -7.0V), GS1117-2.85 (4.25V - 7.0V),
GS1117 - 3.3 (4.75V - 7.0V), GS1117-5 (6.4V - 7.0V).
(2) To maintain the specified junction temperatures, low duty cycle pulse testing is required for most parameters.
GS1117
Vishay Semiconductors
formerly General Semiconductor
Document Number 74802
www.vishay.com
20-Feb-02
3
Electrical Characteristics
(1)
T
J
= 25C
(2)
, V
IN
= 5V, I
o
= 10mA unless otherwise noted.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Output Current
I
o
0C
T
J
125C
0.85
A
2.65
Vin
7V
Adjust Pin Current
I
adj
10mA
I
o
800mA 55
120
A
0C
T
J
125C
2.65
Vin
7V
Adjust Pin Current Change
I
adj
10mA
I
o
800mA 0.2
5
A
0C
T
J
125C
Temperature Stability
T
S
I
o
= 0.5A
0.8
%V
O
0C
T
J
125C
Minimum Load Current
I
LMIN
0C
T
J
125C
3
10
mA
Adjustable Version
Quiescent Current
I
Q
0C
T
J
125C
10
14
mA
Fixed Voltage Version
RMS Output Noise
N
10H
Z
f
10 kH
Z
0.003
%V
O
Ripple Rejection Ratio
RR
f = 120 H
Z
, C
O
= 25
F
60
68
dB
C
adj
= 25
F
Thermal Regulation
R
TH
T
A
= 25C, 30ms Pulse
0.02
0.05
%/W
Long Term Stability
T
A
= 125C, 1000 Hrs
0.3
%V
O
Notes:
V
REF
= V
OUT
V
ADJ
= 1.25V (typ.)
V
OUT
= V
REF
x (1+R2/R1) + I
ADJ
x R2
I
ADJ
= 55
A (typ.)
(1) C1 needed if device is far away from filter capacitors
(2) C2 required for stability
Typical Application Circuit
V
IN
5V
V
OUT
3.3V
C1
10
F
C2
10
F
ADJ
V
REF
1
3
2
R1
125
1%
R2
205
1%
GS1117
Adjustable Voltage Regulator
+
+
V
IN
5V
V
OUT
C1
10
F
C2
10
F
1
3
2
GS1117-2.5
GS1117-2.85
GS1117-3.3
GS1117-5
Fixed Voltage Regulator
+
+
Notes:
(1) All parameters, except nominal output voltage are specified for the variable voltage version, allowing a wider V
in
Range.
The specified limits also apply for the fixed voltage versions.
(2) To maintain the specified junction temperatures, low duty cycle pulse testing is required for most parameters.
GS1117
Vishay Semiconductors
formerly General Semiconductor
www.vishay.com
Document Number 74802
4
20-Feb-02
Ratings and
Characteristic Curves
(T
A
= 25C unless otherwise noted)
1.15
1.20
1.25
1.30
1.10
1.05
20
40
60
80
100
120
140
Fig. 2 Dropout Voltage v.s.
Temperature
Dropout V
oltage (V)
Ambient Temperature (
C)
0
20
40
60
80
100
--50
--25
0
25
50
75
100
125
Fig. 4 Adjust Pin Current
Adjust Pin Current (
A)
Temperature (
C)
0
--1.2
--1.6
--0.8
--0.4
0.0
0.4
0.8
1.2
1.6
--20
0
20
40
60
80
100
120
140
Fig. 5 Temperature Stability
Output V
oltage Deviation (%)
Temperature (
C)
I
OUT
= 800mA
200
400
800
1000
600
Fig. 1 Dropout Voltage
Minimum Dif
ferential V
oltage (V)
Output Current (mA)
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
1
2
4
5
6
3
Fig. 3 Minimum Load Current
(Adjustable Version)
Minimum Operating Current (mA)
Input / Output Differential Voltage (V)
1
2
3
4
5
0
100
1K
100K
10K
1M
Fig. 6 Ripple Rejection
(with C
adj
25
F)
Ripple Rejection (dB)
Frequency (Hz)
20
30
40
50
60
70
80
10
I
OUT
= 0.5A
T
J
= 0
C
T
J
= 25
C
C
OUT
=
25
F
C
OUT
=
25
F
C
OUT
=
10
F
C
OUT
= 10
F
T
J
= 125
C
T
J
= 0
C
T
J
= 50
C
T
J
= 125
C
GS1117
Vishay Semiconductors
formerly General Semiconductor
Document Number 74802
www.vishay.com
20-Feb-02
5
--0.1
0.4A
0.1A
--0.05
0
0.05
0.1
40
80
120
160
200
Fig. 7 Load Transient Response
Load Current
Output V
oltage
(V
, AC)
Time (
s)
0
V
IN
=
5V
C
IN
= 1
F
C
OUT
= 10
F (Tantalum)
V
OUT
= 3.3V
--100
7.0
6.0
--50
0
50
10
20
30
40
50
Fig. 8 Line Transient Response
Input V
oltage (V)
Output V
oltage
(mV
, AC)
Time (
s)
0
C
OUT
= 10
F (Tantalum)
V
OUT
= 3.3V
GS1117 Cxx-xxx
Output Voltage
Default: Adj.
2.5: 2.5V
2.85: 2.85V
3.3: 3.3V
5: 5.0V
Package Type
ST: SOT-223
T: TO-220
M: TO-263
E: TO-252
Ordering Information
Ratings and
Characteristic Curves
(T
A
= 25C unless otherwise noted)
PDF 
ZIP