GS1117
Vishay Siliconix
1A Low Dropout
Positive Adjustable Regulator
SOT-223
TO-252
(DPak)
TO-220AB
TO-263AB
(D
2
Pak)
1
2
3
2
1
3
3
2
3
2
1
GS1117CST
GS1117CE
GS1117CT
1
GS1117CM
Pin Definition
1.
Adjust/Gnd.
2.
V
out (tab)
3.
V
in
Description
The GS1117 is a low dropout three terminal regulator with
1A 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
1.8V, 2.5V, 2.85V, 3.3V or 5V. Dropout is guaranteed at a
maximum of 1.3V 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.
Features
• Dropout Voltage 1.1V at 1A Output Current
• Fast Transient Response
• Line Regulation typically at 0.04%
• Load Regulation typically at 0.1%
• Internal thermal limiting
• Adjustable Output Voltage or Fixed 1.8V, 2.5V, 2.85V,
3.3V, 5V
• Standard 3-Pin Power Packages
Applications
• SCSI-2 Active Terminator
• Post Regulator for Switching Supply
• Battery Chargers
• Constant-Current Regulators
• PC Add-On Card
V
IN
Functional Block Diagram
Mechanical Data
Case:
TO-220AB, TO-263AB (D
2
PAK),
TO-252 (DPAK) and SOT-223
High temperature soldering guaranteed:
V
REF
1.25V
50µA
+
+
GM
--
Current
Amp
Thermal
Limit
Current
Limit
V
OUT
260°C/10 seconds at terminals
Case outlines are on the back page
For
fixed
voltage
device
ADJ
GND
Document Number 74802
04-Feb-05
www.vishay.com
1
GS1117
Vishay Siliconix
Maximum Ratings and Thermal Characteristics
Parameter
Vin Pin to ADJ/GND Pin
Thermal Resistance – Junction to Case
TO-220AB
TO-252
TO-263AB
SOT-223
Operating Junction Temperature Range
Storage Temperature Range
R
θJC
3.0
8.0
3.0
15.0
–20 to +125
–65 to 150
°C/W
(T
A
= 25 °C unless otherwise noted)
Symbol
Vin
Value
7
Unit
V
T
J
T
stg
°C
°C
Electrical Characteristics
Parameter
Output Voltage
(1)
Fixed Voltage
Reference Voltage
(1)
Adj Voltage
Line Regulation
(1)
Load Regulation
(1)
T
J
= 25 °C , I
o
= 10 mA – 1 A, V
IN
= 4.75V – 7V, unless otherwise noted.
Symbol
Test Conditions
V
IN
5V
I
O
10 mA
T
J
Min
0.99 V
N
0°C
≤
T
J
≤
125°C
0.97 V
N
Test Limits
Typ
V
N
Max
1.01 V
N
1.03 V
N
1.250
0.03
1.262
1.275
0.3
0.35
0.3
0.5
1.3
1.15
1.1
Unit
V
O
V
REF
5V
10 mA
0 °C
≤
T
J
≤
125 °C
1.238
1.225
V
REG
(LINE)
10 mA
0°C
≤
T
J
≤
125°C
0.035
0.1
%/V
O
REG
(LOAD)
5V
1A
0°C
≤
T
J
≤
125°C
0.2
1.15
1.05
1.0
1.0
1.1
12
Dropout Voltage
∆V
out
= 1%
Current Limit
Quiescent Current
Fixed Model
Temperature Coefficient
Adjust Pin Current
Adjust Pin Current Change
Minimum Load Current
Adjustable Version
RMS Output Noise
(2)
Ripple Rejection Ratio
(3)
V
DROP
I
CL
I
Q
T
C
I
ADJ
∆I
ADJ
I
O
V
N
R
R
5V
5V
5V
5V
5V
5V
500mA
100mA
0°C
≤
T
J
≤
125°C
V
A
14
mA
%V
O
/ °C
0.5 A
0°C
≤
T
J
≤
125°C
0.005
55
0.2
5
0.003
120
5
14
µA
mA
%V
O
dB
10 mA
0°C
≤
T
J
≤
125°C
60
72
Notes:
(1) Low duty cycle pulse testing with Kelvin connections required..
(2) Bandwidth of 10 H
Z
to 10 KH
Z
.
(3) 120 H
Z
input ripple (C
ADJ
for ADJ) = 25
µF.
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Document Number 74802
04-Feb-05
GS1117
Vishay Siliconix
Typical Application Circuit
V
IN
5V
3
GS1117-xx
2
V
OUT
V
IN
5V
3
2
R1
125Ω
1%
R2
205Ω
1%
V
OUT
3.3V
GS1117
1 ADJ
C1
10µF
+
1
+
V
REF
C2
10µF
C1
10µF
+
+
C2
10µF
Fixed Voltage Regulator
Adjustable Voltage Regulator
Notes:
V
REF
= V
OUT
– V
ADJ
= 1.25V (typ.)
V
OUT
= V
REF
x (1+R2/R1) + I
ADJ
x R2
I
ADJ
= 50µA (typ.)
(1) C1 needed if device is far away from filter capacitors
(2) C2 required for stability
Document Number 74802
04-Feb-05
www.vishay.com
3
GS1117
Vishay Siliconix
Ratings and
Characteristic Curves
(T
A
= 25°C unless otherwise noted)
Fig. 1 – Dropout Voltage
1.3
1.4
Fig. 2 – Dropout Voltage v.s.
Temperature
I
OUT
= 1 A
T
J
= 0
°C
1.2
Minimum Differential Voltage (V)
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
200
400
600
T
J
= 50
°C
T
J
= 125
°C
Dropout Voltage (V)
1.1
1.0
0.9
0.8
800
1000
0
20
40
60
80
100
120
140
Output Current (mA)
Ambient T
emperature (°C)
Fig. 3 – Minimum Load Current
(Adjustable Version)
10
100
Fig. 4 – Adjust Pin Current
Minimum Operating Current (mA)
T
J
= 125°C
6
T
J
= 25°C
4
T
J
= 0°C
Adjust Pin Current (µA)
6
8
80
60
40
2
20
0
1
2
3
4
5
0
--50
--25
0
25
50
75
100
125
Input / Output Differential Voltage (V)
T
emperature (°C)
Fig. 5 – Temperature Stability
1.2
I
OUT
= 0.5A
0.9
80
70
Fig. 6 – Ripple Rejection
(with C
adj
25µF)
C
OUT
= 25µF
Output Voltage Deviation (%)
0.6
0.3
0.0
--0.3
--0.6
--0.9
--1.2
--20
0
20
40
60
80
100
120
140
Ripple Rejection (dB)
60
50
40
30
C
OUT
= 10µF
C
OUT
= 25µF
C
OUT
= 10µF
20
10
100
1K
10K
100K
1M
T
emperature (°C)
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Frequency (Hz)
Document Number 74802
04-Feb-05
GS1117
Vishay Siliconix
Ratings and
Characteristic Curves
(T
A
= 25°C unless otherwise noted)
Fig. 7 – Load Transient Response
0.1
Fig. 8 – Line Transient Response
Output Voltage
(mV, AC)
50
0
--50
--100
C
OUT
= 10µF (Tantalum)
V
OUT
= 3.3V
Output Voltage
(V, AC)
0.05
0
--0.05
--0.1
V
IN
= 5V
C
IN
= 1µF
C
OUT
= 10µF (Tantalum)
V
OUT
= 3.3V
Load Current
Input Voltage (V)
0.4A
0.1A
7.0
6.0
0
40
80
120
160
200
0
10
20
30
40
50
Time (µs)
Time (µs)
Ordering Information
Part Number
GS1117CST/2F-E3
GS1117CST-18/2F-E3
GS1117CST-25/2F-E3
GS1117CST-28/2F-E3
GS1117CST-33/2F-E3
GS1117CST-5/2F-E3
GS1117CE/27H
GS1117CE-1.8/27H
GS1117CE-2.5/27H
GS1117CE-2.85/27H
GS1117CE-3.3/27H
GS1117CE-5/27H
GS1117CM/31F-E3
GS1117CM-18/31F-E3
GS1117CM-25/31F-E3
GS1117CM-28/31F-E3
GS1117CM-33/31F-E3
GS1117CM-5/31F-E3
GS1117CT/45H
GS1117CT-1.8/45H
GS1117CT-2.5/45H
GS1117CT-2.85/45H
GS1117CT-3.3/45H
GS1117CT-5/45H
Output Voltage (V)
Adjustable
1.8
2.5
2.85
3.3
5.0
Adjustable
1.8
2.5
2.85
3.3
5.0
Adjustable
1.8
2.5
2.85
3.3
5.0
Adjustable
1.8
2.5
2.85
3.3
5.0
TO-220
TO-263
DPAK
TO-252
DPAK
SOT-223
Package
Document Number 74802
04-Feb-05
www.vishay.com
5
51单片机
