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SPX1431
Precision Adjustable Shunt Regulator
FEATURES APPLICATIONS
•
Voltage Tolerance ................................................ 0.4%
•
Wide Operating Current .....................1mA to 150mA
•
Extended Temperature Range ........... -55
°°°°
C to 125
°°°°
C
• Low Temperature Coefficient ........................30 ppm/°C
•
Improved
Replacement in Performance for
LT1431
• Offered In Small Low Power SOT-89 Package
•
Low Output Noise
PRODUCT DESCRIPTION
The SPX1431 is a 3-terminal Adjustable Shunt Voltage Regulator providing a highly accurate 0.4% bandgap reference. SPX1431 acts
as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX1431 thermal stability, wide operating
current (150mA) and temperature range (125°C) makes it suitable for all varieties of applications that are looking for a low cost
solution with high performance.
system to virtually eliminate the need for trimming in the power supply manufactures assembly line and contribute a
significant cost savings.
In the standard shunt configuration, the combination of low temperature coefficient (T.C.), sharp turn-on characteristics, low output
impedance and programmable output voltage that makes this precision reference an excellent error amplifier.
The SPX1431 is a direct improved replacement for the SPX431 and TL431 in low voltage, low current applications.
SPX1431 tolerance of 0.4% is proven to be sufficient to overcome all of the other errors in the
PIN CONFIGURATIONS
CATHODE
Standard Pinout
8-Pin Surface Mount (S)
1
2
N/C
SPX1431
3
4
Top View
ANODE
SOT-23-5 (M5)
REF
ANODE
REF
8
ANODEANODE
7
ANODE
6
N/C
5
54
SPX1431
3
21
N/C
N/C
CATHODE
Top View
• Battery Operating Equipment
• Adjustable Supplies
• Switching Power Supplies
• Error Amplifiers
• Single Supply Amplifiers
• Monitors / VCR / TV
• Personal Computers
SOT-89 (M1)
SPX1431
1
2
REF
ANODE
Front View
3
CATHODE
REF
Bottom View
TO-92 (N)
2
13
ANODE
CATHODE
Rev. 10/25/00
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SPX1431
CATHODE (K)
REFERENCE
(R)
+
-
2.5V
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol Rating Units
Cathode-Anode Reverse Breakdown VKA 37 V
Anode-Cathode Forward Current IAK 1 A
Operating Cathode Current IKA 250 mA
Reference Input Current I
Continuous Power Dissipation at 25°C
TO-92
SOT-23
8L SOIC
SOT-89
Junction Temperature TJ 150
Storage Temperature T
Lead Temperature (Soldering 10 sec.) TL 300
Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
10 mA
REF
P
D
- 65 to 150
STG
ANODE (A)
775
200
750
1000
mW
mW
mW
mW
°C
°C
°C
RECOMMENDED CONDITIONS TYPICAL THERMAL RESISTANCES
PARAMETER SYMBOL RATING UNIT PACKAGE 0JA 0
Cathode Voltage VKA V
Cathode Current IK 10 mA SOT-23
SOIC
SOT-89
to 20 V TO-92
REF
160° C/W 80° C/W 6.3 mW/°C
575° C/W 150° C/W 1.7 mW/°C
175° C/W 45° C/W 5.7 mW/°C
110° C/W 8° C/W 9.1 mW/°C
TYPICAL DERATING
JC
Rev. 10/25/00
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SPX1431
V
KA
are guaranteed over full junction temperature range (-55°C to 125°C). Ambient
KA
T
= 25°C
A
= 3V to 36V 2 -2 -1.1 mV/V
K
= 10 k; R2 = 2 0.7 1.9
I
= 0V, VKA =
REF
1 2.490 2.500 2.510 V
3 0.04 250 nA
36V
1 0.15 0.2 Ω
100mA
∆
V
(mV)
REF
= V
REF
∆Τ
TC in mV/°C =
TC in %/°C =
TC in ppm/°C =
V
IN
R
1
I
(V
REF
R
REF
)
2
V
KA
I
K
)
V
REF
∆
∆
V
at 25°C
REF
∆
)
V
REF
T
A
REF
T
A
∆
V
REF
at 25°C
∆
T
A
V
x 100
)
6
x 10
)
IN
= V
REF
I
and
mV/°
C
µA
µA
K (OFF)
V
KA
ELECTRICAL CHARACTERISTICS
temperature must be derated based on power dissipation and package thermal characteristics. The conditions are: V
I
= 10mA, unless otherwise specified.
K
Parameter Symbol Test Conditions Test Circuit Min Typ Max Units
Reference Voltage V
REF
Over Temp. 1 2.465 2.535 V
V
with Temp* TC 1 0.06 0.16
REF
Ratio of Change in V
REF
V
V
REF
to Cathode Voltage
Reference Input Current I
I
Temp Deviation I
REF
Min IK for Regulation I
Off State Leakage I
Dynamic Output
R
REF
Over Temp. 2 0.4 1.2
REF
1 0.4 1 mA
K (min)
V
K (off)
ZKA f < 1 kHz IK 1 to
Impedance
Calculating Average Temperature Coefficient (TC)
ppm
mV
%
000
-10
0.55000
∆
-20
-55
-25 0 25 50 75 100 125
Temperature (°C)
0.06 mV/°C
0.002 %/°C
24 ppm/°C
TEST CIRCUITS
V
IN
V
I
REF
I
K
Figure
1a. Test Circuit 1
Figure
1b. Test Circuit 2
Figure
1c. Test Circuit 3
Rev. 10/25/00
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TYPICAL PERFORMANCE CURVES
900
800
700
600
A)
µ
µµ
µ
500
Low Current Operating Characteristics
VKA = V
Temperature Range: - 55 to 125 °C
REF
400
300
200
- Cathode Current (
K
I
100
0
-100
-200
VKA - Cathode Voltage (V)
125 °C
25 °C
-55 °C
1.0-1.0 2.00 3.0
Figure 2
100
Off State Leakage
VKA = 18V
V
= 0V
REF
10
1
0.1
off - Off State Cathode Current (nA)
Z
I
0.01
-60 -30 0 30 60 90 120
- Ambient Temperature ( °C)
T
A
Figure 4
SPX1431
High Current Operating Characteristics
150
VKA = V
125
100
75
50
25
0
- Cathode Current (mA)
-25
K
I
-50
-75
-100
-2 -1 0 1 2 3
2.53
2.52
2.51
2.50
2.49
2.48
- Reference Voltage (V)
EF
R
V
2.47
2.46
2.45
Temperature Range: - 55 to 125 °C
Reference Voltage vs. Ambient Temperature
V
= V
KA
REF
IK = 10
mA
V
= 2.500 V at 25 °C
REF
-60 -30 0 30 60 90 120
REF
VKA - Cathode Voltage (V)
Figure 3
TA - Ambient Temperature ( °C)
Figure 5
Rev. 10/25/00
Page 5
TYPICAL PERFORMANCE CURVES
3.0
2.5
A)
µ
µµ
µ
2.0
Reference Input Current
R1 = 10 k
R2 =
IK = 10 mA
1.5
1.0
- Reference Input Current (
EF
R
I
0.5
0
-60 -30 0 30 60 90 120
TA - Ambient Temperature ( °C)
Figure 6
70
Noise Voltage
60
50
40
30
Noise Voltage nV/vHz
20
10
V
= V
KA
REF
IK = 10 mA
= 25 C
T
A
0
10 100 1 k 10 k
f - Frequency (Hz)
Figure 8
SPX1431
Ω
∞
100 k
0
-10
-20
-30
- Change in Reference Voltage (mV)
-40
REF
V
-50
0 3 6 9 12 15 18 21 24 27
0.150
0.125
)
Ω
ΩΩ
Ω
0.100
0.075
0.050
- Dynamic Impedance (
A
K
Z
0.025
0.0
-60 -30 0 30 60 90 120
Reference Voltage Line Regulation
-55 °C
0 °C
25 °C
75 °C
125 °C
VKA - Cathode Voltage (V)
Figure 7
Low Frequency Dynamic Output Impedance
V
= V
KA
REF
IKA = 1 to 100 mA
f <
1 kHz
TA - Free Air Temperature
Figure 9
30
Rev. 10/25/00
Page 6
TYPICAL PERFORMANCE CURVES
100
)
10
Ω
ΩΩ
Ω
1.0
- Dynamic Impedance (
KA
0.1
Z
0.01
1 k 10 k 100 k 1 M 10 M
Small Signal Voltage Gain vs. Frequency
70
Temperature Range: -55 to 125 °C
60
50
= 10 mA
I
K
40
30
20
- Small Signal Voltage Gain (dB)
V
A
10
0
1 k 10 k 100 k 1 M 10 M
f - Frequency (Hz)
Dynamic Output Impedance
TA = 25 °C
= 1 to 100 mA
I
K
f - Frequency (Hz)
Figure 10
Figure 11
9 µF
15 k
8.25 k
SPX1431
OUT
230
I
K
Ω
GND
Rev. 10/25/00
Page 7
TYPICAL PERFORMANCE CURVES
6
5
4
3
2
Pulse Response
INPUT
OUTPUT
1
Input and Output Voltages (V)
0
-1
µµµµ
t - Time (
s)
11109876543210
100
90
80
70
60
50
= V
A: V
KA
B: VKA = 5V at IK = 10 mA
C: V
= 10V at IK = 10 mA
KA
D: V
= 15V at IK = 10 mA
KA
Stability Boundary Conditions
REF
C
40
- Cathode Current (mA)
K
I
30
20
10
T
= 25 °C
A
0
0
10
10
1
STABILITY
REGION
A
B
2
10
3
10
CL - Load Capacitance (pF)
D
4
10
5
10
SPX1431
INPUT
MONITOR
fP = 100 kHz
12
Figure 12
Ω
150
6
10
7
10
Figure 13
Ω
220
Ω
50
I
K
10 k
OUT
GND
C
L
Rev. 10/25/00
Page 8
SPX1431
ORDERING INFORMATION
Ordering No. Precision Output Voltage Packages
SPX1431M5
SPX1431M1
SPX1431S
SPX1431N
0.4% 2.5V 5 Lead SOT-23
0.4% 2.5V 3 Lead SOT-89
0.4% 2.5V 8 Lead SOIC
0.4% 2.5V 3 Lead TO-92
SIGNAL PROCESSING EXCELLENCE
Corporation
Sipex Corporation
Headquarters and Main Offices:
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 935-7600
FAX: (408) 934-7500
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described
hereing; neither does it convey any license under its patent rights nor the rights of others.
Rev. 10/25/00
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