GS1117
Vishay Siliconix
Document Number 74802 www.vishay.com
04-Feb-05 1
1A Low Dropout
Positive Adjustable Regulator
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.
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 (D2PAK),
TO-252 (DPAK) and SOT-223
High temperature soldering guaranteed:
260°C/10 seconds at terminals
Case outlines are on the back page
+
+--
For
fixed
voltage
device
Thermal
Limit
Current
Amp
Current
Limit
GM
VOUT
VIN
ADJ GND
VREF
1.25V
50µA
Functional Block Diagram
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
TO-220AB TO-263AB
(D2Pak)
GS1117CT GS1117CMGS1117CE
TO-252
(DPak)
1
2
31
2
3
1
23
GS1117CST
SOT-223
1
2
3
Pin Definition
1. Adjust/Gnd.
2. Vout (tab)
3. Vin
GS1117
Vishay Siliconix
www.vishay.com Document Number 74802
204-Feb-05
Maximum Ratings and Thermal Characteristics (TA= 25 °C 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 RθJC 8.0 °C/W
TO-263AB 3.0
SOT-223 15.0
Operating Junction Temperature Range TJ–20 to +125 °C
Storage Temperature Range Tstg –65 to 150 °C
Electrical Characteristics TJ= 25 °C , Io= 10 mA – 1 A, VIN = 4.75V – 7V, unless otherwise noted.
Parameter Symbol Test Conditions Test Limits Unit
VIN IOTJMin Typ Max
Output Voltage(1)
VO
5 V 10 mA 0.99 VNVN1.01 VN
Fixed Voltage 0 °C ≤T
J ≤125 °C 0.97 VN1.03 VNV
Reference Voltage(1)
VREF
5 V 10 mA 1.238 1.250 1.262
Adj Voltage 0 °C ≤TJ ≤125 °C 1.225 1.275
Line Regulation(1) REG(LINE) 10 mA 0.03 0.3
0 °C ≤T
J ≤125 °C 0.035 0.35 %/VO
Load Regulation(1) REG(LOAD) 5 V 0.1 0.3
0 °C ≤T
J ≤125 °C 0.2 0.5
Dropout Voltage VDROP
1A 1.15 1.3
V
∆Vout = 1% 500mA 0 °C ≤T
J ≤125 °C 1.05 1.15
100mA 1.0 1.1
Current Limit ICL 5 V 1.0 1.1 A
Quiescent Current IQ5 V 12 14 mA
Fixed Model
Temperature Coefficient TC5 V 0.5 A 0 °C ≤T
J ≤125 °C 0.005 %VO/°C
Adjust Pin Current IADJ 55 120 µA
Adjust Pin Current Change ∆IADJ 0.2 5
Minimum Load Current IO5 V 5 14 mA
Adjustable Version
RMS Output Noise(2) VN5 V 0.003 %VO
Ripple Rejection Ratio(3) RR5 V 10 mA 0 °C ≤T
J ≤125 °C 6 0 7 2 dB
Notes:
(1) Low duty cycle pulse testing with Kelvin connections required..
(2) Bandwidth of 10 HZto 10 KHZ.
(3) 120 HZinput ripple (CADJ for ADJ) = 25 µF.
GS1117
Vishay Siliconix
Document Number 74802 www.vishay.com
04-Feb-05 3
Notes:
VREF = VOUT – VADJ = 1.25V (typ.)
VOUT = VREF x (1+R2/R1) + IADJ x R2
IADJ = 50µA (typ.)
(1) C1 needed if device is far away from filter capacitors
(2) C2 required for stability
Typical Application Circuit
VIN
5V
VOUT
3.3V
C1
10µF
C2
10µF
ADJ VREF
1
32
R1
125Ω
1%
R2
205Ω
1%
G S 111 7
Adjustable Voltage Regulator
++
VIN
5V VOUT
C1
10µF
C2
10µF
1
32
GS1117-xx
Fixed Voltage Regulator
++
GS1117
Vishay Siliconix
www.vishay.com Document Number 74802
404-Feb-05
Ratings and
Characteristic Curves (TA= 25°C unless otherwise noted)
1.0
1.1
1.2
1.3
0.9
0.8
20 40 60 80 100 120 140
Fig. 2 – Dropout Voltage v.s.
Temperature
Dropout Voltage (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 (µA)
Temperature (°C)
0
--1.2
--0.9
--0.6
--0.3
0.0
0.6
0.9
1.2
--20 0 20 40 60 80 100 120 140
Fig. 5 – Temperature Stability
Output Voltage Deviation (%)
Temperature (°C)
IOUT = 1 A
200 400 800 1000600
Fig. 1 – Dropout Voltage
Minimum Differential Voltage (V)
Output Current (mA)
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
12 4563
Fig. 3 – Minimum Load Current
(Adjustable Version)
Minimum Operating Current (mA)
Input / Output Differential Voltage (V)
2
4
6
8
10
0
100 1K 100K10K 1M
Fig. 6 – Ripple Rejection
(with Cadj 25µF)
Ripple Rejection (dB)
Frequency (Hz)
20
30
40
50
60
70
80
10
IOUT = 0.5A
TJ = 0°C
TJ = 25°C
0.3
COUT = 25µF
COUT = 25µF
COUT = 10µF
COUT = 10µF
TJ = 125°C
TJ = 0 °C
TJ = 50 °C
TJ = 125 °C
GS1117
Vishay Siliconix
Document Number 74802 www.vishay.com
04-Feb-05 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 Voltage
(V, AC)
Time (µs)
0
VIN = 5V
CIN = 1µF
COUT = 10µF (Tantalum)
VOUT = 3.3V --100
7.0
6.0
--50
0
50
10 20 30 40 50
Fig. 8 – Line Transient Response
Input Voltage (V)
Output Voltage
(mV, AC)
Time (µs)
0
COUT = 10µF (Tantalum)
VOUT = 3.3V
Ratings and
Characteristic Curves (TA= 25°C unless otherwise noted)
Ordering Information
Part Number Output Voltage (V) Package
GS1117CST/2F-E3 Adjustable
GS1117CST-18/2F-E3 1.8
GS1117CST-25/2F-E3 2.5 SOT-223
GS1117CST-28/2F-E3 2.85
GS1117CST-33/2F-E3 3.3
GS1117CST-5/2F-E3 5.0
GS1117CE/27H Adjustable
GS1117CE-1.8/27H 1.8
GS1117CE-2.5/27H 2.5 TO-252
GS1117CE-2.85/27H 2.85 DPAK
GS1117CE-3.3/27H 3.3
GS1117CE-5/27H 5.0
GS1117CM/31F-E3 Adjustable
GS1117CM-18/31F-E3 1.8
GS1117CM-25/31F-E3 2.5 TO-263
GS1117CM-28/31F-E3 2.85 DPAK
GS1117CM-33/31F-E3 3.3
GS1117CM-5/31F-E3 5.0
GS1117CT/45H Adjustable
GS1117CT-1.8/45H 1.8
GS1117CT-2.5/45H 2.5
GS1117CT-2.85/45H 2.85 TO-220
GS1117CT-3.3/45H 3.3
GS1117CT-5/45H 5.0
GS1117
Vishay Siliconix
www.vishay.com Document Number 74802
604-Feb-05
Case Outlines
3.15
2.90
6.80
6.30
Top View
7.30
6.70
3.70
3.30
0.80
0.60
123
1.80
Max.
13° ±3°
0.12
0.02
2.30
Typ.
0.35
0.24
0.91
Min.
SOT-223
Dimensions in millimeters
14.60
15.88
9.65
10.29 4.06
4.83
1.40
(max.)
8.28
9.65
2.54
(typ.)
1.15
1.39
0.74
(max.)
0.51
0.99
1.12
1.40
2.79
(max.)
0.25
(typ.)
0
°
~ 8
°
TO-263-3L
TO-252 (DPAK)
5.59
5.33 10.42
9.40
5.46
5.21
6.73
6.35
0.58
0.46
2.38
2.19
2.28 (TYP.)
0.88
0.64
13
2
1.27
1.02
0.51 (min.)
TO-220
10.66
9.66
6.35 Max.
3.42
2.54
4.08
3.54
6.85
5.85
16.51
14.23
14.73
12.70
1.77
1.15
1.01
0.38
2.79
2.29
(with plating)
4.82
3.56
1.39
0.51
1.14
0.31 2.92
2.04
(with plating)
