Vishay GS1085CM1.8 3a low dropout positive adjustable regulator Datasheet

GS1085
Vishay
New Product
formerly General Semiconductor
3A Low Dropout Positive Adjustable Regulator
TO-252
(DPak)
TO-263AB
(D2Pak)
TO-220AB
2
3
2
3
1
1
3
2
1
GS1085CE
GS1085CT
GS1085CM
Pin Definition
1. Adjust/Gnd.
2. Vout (tab)
3. Vin
Description
The GS1085 is a low dropout three terminal regulator with
3A output current capability. The output voltage is
adjustable with the use of a resistor divider. For fixed output
voltage versions, the output voltage is internally set at
1.8V, 2.5V, or 3.3V. Dropout is guaranteed at a maximum
of 1.4V at maximum output current. Its low dropout voltage
and fast transient response make it ideal for low voltage
microprocessor applications. Internal current and thermal
limiting provides protection against any overload condition
that would create excessive junction temperatures.
Features
• Dropout Voltage 1.3V at 3A Output Current
• Fast Transient Response
• Line Regulation typically at 0.015%
• Load Regulation typically at 0.1%
Applications
• Internal thermal and current limiting
• Adjustable Output Voltage or Fixed 1.8V, 2.5V, 3.3V
• Post Regulator for Switching Supply
• Standard 3-Pin Power Packages
• Microprocessor Power Supplies
• Constant-Current Regulators
• Motherboard I/O Power Supplies
Functional Block Diagram
Mechanical Data
VIN
VREF
1.25V
+
+
GM
--
Current
Amp
High temperature soldering guaranteed:
260°C/10 seconds at terminals
Thermal
Limit
55µA
Case: TO-220AB, TO-263AB (D2PAK),
TO-252 (DPAK)
Current
Limit
Case outlines are on the back page
For
fixed
voltage
device
ADJ
Document Number 74821
24-May-02
VOUT
GND
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GS1085
Vishay
formerly General Semiconductor
Maximum Ratings and Thermal Characteristics
Parameter
Vin Pin to ADJ/GND Pin
(TA = 25°C unless otherwise noted)
Symbol
Value
Unit
Vin
7
V
RθJC
3.0
8.0
3.0
°C/W
TJ
0 to +125
°C
Tstg
–65 to 150
°C
Thermal Resistance – Junction to Case
TO-220AB
TO-252
TO-263AB
Operating Junction Temperature Range
Storage Temperature Range
Electrical Characteristics (1)
Parameter
Reference Voltage
TJ = 25°C
(2)
, VIN = 5V, Io = 10mA unless otherwise noted.
Symbol
Test Conditions
Min
Typ
Max
VREF
TJ = 25°C
0°C ≤ TJ ≤ 125°C
2.65V ≤ VIN ≤ 7V
10mA ≤ Io ≤ 3A
1.238
1.225
1.250
1.250
1.262
1.275
1.78
2.47
3.26
0.98VN
1.8
2.5
3.3
VN
1.82
2.53
3.33
1.02VN
GS1085-1.8
VIN = 5V
GS1085-2.5
VIN = 5V
GS1085-3.3
VIN = 7V
GS1085
0°C ≤ TJ ≤ 125°C
2.65V ≤ VIN ≤ 5V
10mA ≤ Io ≤ 3A
Unit
V
Output Voltage
VOUT
Line Regulation
REGline
2.65V ≤ VIN ≤ 7V
TJ = 25°C
0°C ≤ TJ ≤ 125°C
0.015
0.035
0.2
0.2
% VO
Load Regulation
REGload
10mA ≤ Io ≤ 3A
TJ = 25°C
0°C ≤ TJ ≤ 125°C
0.1
0.2
0.3
0.4
% VO
Dropout Voltage
VDROP
0°C ≤ TJ ≤ 125°C
Io = 3A
Io = 2A
Io = 1A
1.3
1.28
1.25
1.4
1.37
1.34
Output Current
Io
0°C ≤ TJ ≤ 125°C
3.0
4.0
–
A
Iadj
2.65 ≤ Vin ≤ 7V
10mA ≤ Io ≤ 3A
0°C ≤ TJ ≤ 125°C
–
55
120
µA
∆Iadj
2.65 ≤ Vin ≤ 7V
10mA ≤ Io ≤ 3A
0°C ≤ TJ ≤ 125°C
–
0.2
5
µA
TS
Io = 0.5A
0°C ≤ TJ ≤ 125°C
–
0.5
–
%VO
ILMIN
0°C ≤ TJ ≤ 125°C
–
5
10
mA
Adjust Pin Current
Adjust Pin Current Change
Temperature Stability
Minimum Load Current
Adjustable Version
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V
V
Document Number 74821
24-May-02
GS1085
Vishay
formerly General Semiconductor
Electrical Characteristics (con’t.)(1)
Parameter
TJ = 25°C
(2)
, VIN = 5V, Io = 10mA unless otherwise noted.
Symbol
Test Conditions
Min
Typ
Max
Unit
Quiescent Current
Fixed Voltage Version
IQ
0°C ≤ TJ ≤ 125°C
–
10
14
mA
RMS Output Noise
N
10HZ ≤ f ≤ 10 kHZ
–
0.003
–
%VO
Ripple Rejection Ratio
RR
f = 120 HZ, CO = 25µF
Cadj = 25µF
60
68
–
dB
Thermal Regulation
RTH
TA = 25°C, 30ms Pulse
–
0.02
0.05
%/W
TA = 125°C, 1000 Hrs
–
0.3
–
%VO
Long Term Stability
Notes:
(1) All parameters, except nominal output voltage are specified for the variable voltage version, allowing a wider Vin Range.
The specified limits also apply for the fixed voltage versions over the allowable input voltage range: GS1085-1.8 (3.2V - 7.0V), GS1085-2.5 (3.9V - 7.0V),
GS1085-3.3 (4.75V - 7.0V).
(2) To maintain the specified junction temperatures, low duty cycle pulse testing is required for most parameters.
Typical Application Circuit
VIN
5V
C1
10µF
3
GS1085-1.8
GS1085-2.5
GS1085-3.3
+
2
1
Fixed Voltage Regulator
VOUT
VIN
5V
3
GS1085
1 ADJ
+
C2
10µF
C1
10µF
VOUT
3.3V
2
VREF
R1
125Ω
1%
+
+
C2
10µF
R2
205Ω
1%
Adjustable Voltage Regulator
Notes:
VREF = VOUT – VADJ = 1.25V (typ.)
VOUT = VREF x (1+R2/R1) + IADJ x R2
IADJ = 55µA (typ.)
(1) C1 needed if device is far away from filter capacitors
(2) C2 required for stability
Document Number 74821
24-May-02
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GS1085
Vishay
formerly General Semiconductor
Ratings and
Characteristic Curves (TA = 25°C unless otherwise noted)
Fig. 1 – Dropout Voltage
vs. Output Current
Fig. 2 – Load Regulation
vs. Temperature
0.10
IOUT = 3A
1.20
Output Voltage Deviation (%)
Minimum Differential Voltage (V)
1.22
1.18
1.16
1.14
1.12
1.10
1.08
0.05
0
--0.05
--0.10
--0.15
1.06
--0.20
0.5
0
1.0
1.5
2
2.5
0
3.0
20
40
Fig. 3 – Minimum Load Current
(Adjustable Version)
100
120
Fig. 4 – Adjust Pin Current
100
10
Adjust Pin Current (µA)
8
TJ = 125°C
6
TJ = 25°C
4
TJ = 0°C
2
0
1
2
3
4
5
80
60
40
20
0
--50
6
--25
0
25
50
75
100
Input / Output Differential Voltage (V)
Temperature (°C)
Fig. 5 – Temperature Stability
Fig. 6 – Ripple Rejection
(with Cadj 25µF)
125
80
1.0
COUT = 25µF
Iout = 0.5A
0.75
70
Ripple Rejection (dB)
Output Voltage Deviation (%)
80
Temperature (°C)
Output Current (A)
Minimum Operating Current (mA)
60
0.5
0.25
0.0
--0.25
--0.5
COUT = 10µF
60
COUT = 25µF
50
40
30
COUT = 10µF
--0.75
--1.0
--20
20
0
20
40
60
80
Temperature (°C)
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100
120
140
10
100
1K
10K
100K
1M
Frequency (Hz)
Document Number 74821
24-May-02
GS1085
Vishay
formerly General Semiconductor
Ratings and
Characteristic Curves
(TA = 25°C unless otherwise noted)
Fig. 8 – Line Transient Response
Fig. 7 – Load Transient Response
Output Voltage
(mV, AC)
0.05
0
VIN = 5V
CIN = 1µF
COUT = 10µF (Tantalum)
VOUT = 3.3V
--0.05
--0.1
Input Voltage (V)
Load Current
Output Voltage
(V, AC)
0.1
1.5A
0.1A
0
40
80
120
160
50
0
--50
COUT = 10µF (Tantalum)
VOUT = 3.3V
--100
7.0
6.0
0
200
10
20
30
40
50
Time (µs)
Time (µs)
Ordering Information
GS1085Cxx xxx
Output Voltage
Default: Adj.
1.8: 1.8V
2.5: 2.5V
3.3: 3.3V
Package Type
T: TO-220
M: TO-263
E: TO-252
Document Number 74821
24-May-02
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GS1085
Vishay
formerly General Semiconductor
Case Outlines
TO-220
TO-252 (DPAK)
6.73
6.35
10.66
9.66
2.38
2.19
3.42
2.54
0.58
0.46
5.46
5.21
4.82
3.56
4.08
3.54
1.39
0.51
6.85
5.85
16.51
14.23
5.59
5.33
2
1
10.42
9.40
3
6.35 Max.
0.88
0.64
0.51 (min.)
14.73
12.70
2.28 (TYP.)
1.27
1.02
2.79
2.29
TO-263
10.29
4.83
9.65
4.06
1.40
1.77
1.15
1.01 (with plating)
0.38
(with plating)
1.14
0.31
2.92
2.04
Dimensions in millimeters
1.14
1.40 (max.)
9.66
8.63
15.88
1
2
3
14.60
1.40
2.80
1.14
2.28
0.7 (max.)
1.00
0.50
2.54 (TYP.)
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Document Number 74821
24-May-02
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