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SPX1431 Precision Adjustable Shunt Regulator
FEATURES Trimmed Bandgap Reference to 0.4% CATHODE 1 8 REF Wide Operating Current 1mA to 150mA SPX1431 7 ANODE ANODE 2 Extended Temperature Range: 8 Pin nSOIC -55C to 125C ANODE 3 6 ANODE Low Temperature Coefficient 30 ppm/C N/C 4 5 N/C Available in Lead Free Packaging Offered in TO-92, SOIC, SOT-89, SOT-23-5 Improved Replacement in Performance for Now Available in Lead Free Packaging LT1431 Low Cost Solution APPLICATIONS Error Amplifiers Battery Operating Equipment Single Supply Amplifier Adjustable Supplies Monitors / VCRs / TVs Switching Power Supplies Personal Computers DESCRIPTION The SPX1431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. The SPX1431 acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX1431's thermal stability, wide operating current (150mA) and temperature range (-55C to 125C) makes it suitable for a variety of applications that require a low cost, high performance solution. SPX1431 tolerance of 0.4% is proven to be sufficient to overcome all of the other errors in the system to virtually eliminate the need for trimming in the power supply manufacturer's assembly lines and contributes a significant cost savings. The output voltage may be adjusted to any value between VREF and 36 volts with two external resistors. The SPX1431 is available in TO-92, SOIC-8, SOT-89, and SOT-23-5 packages. BLOCK DIAGRAM
Cathode (K)
Reference (R)
+ 2.5V
Anode (A)
Mar3-07 SPX43 Precision Adjustable Shunt Regulator (c) 2007 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
Cathode-Anode Reverse Breakdown VKA ....................................... 37V Anode-Cathode Forward Current, (<10ms) IAK ................................. 1A Operating Cathode Current IKA .................................................. 150mA Reference Input Current IREF ........................................................ 10mA Continuous Power Dissipation at 25C PD TO-92 ..................................................................... 775mW SOT-23 .................................................................. 200 mW SOIC-8 .................................................................... 750mW SOT-89 ................................................................. 1000mW Junction Temperature TJ ........................................................... 150 C Storage Temperature TSTG .............................................. -65 to 150 C NOTE: 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.
RECOMMENDED CONDITIONS
PARAMETER Cathode Voltage Cathode Current SYMBOL VKA IK RATING VREF to 36 10 UNIT V mA
TYPICAL THERMAL RESISTANCES
PACKAGE TO-92 SOT-23 SOIC-8 SOT-89 0 JA 0JC TYPICAL DERATING 6.3 mW/C 1.7 mW/C 5.7 mW/C 9.1mW/C 160C/W 80C/W 575C/W 150C/W 175C/W 45C/W 110C/W 8C/W
Typical deratings of the thermal resistances are given for ambient temperature >25C.
ELECTRICAL CHARACTERISTICS
Electrical characteristics at 25C IK= 10mA V K= V REF, unless otherwise specified. PARAMETER SPX1431 Reference Voltage VREFwithTemp.* Ratio of Change in VREF to Cathode Voltage Reference Input Current IREFTemp Deviation Min IKfor Regulation Off State Leakage Dynamic Output Impedance VREF TC VREF VK IREF IREF I K(MIN) IK(OFF) ZKA 2 2 2 3 3 3 2 4 2 VREF= 0V, VKA= 36V z 1kHz IK= 1 to 150mA TJ= 0 C to 105C Vk= 3V to 36V -2.0 TJ= 0 C to 105C 2.490 2.465 2.500 0.07 -1.1 0.7 0.4 0.4 0.04 0.15 1.9 1.2 1 250 0.5 2.510 2.535 0.20 V V mV/ C mV/V A A mA nA SYMBOL FIGURE CONDITIONS MIN TYP MAX UNITS
Operating Range (TJ ) = - 55C to 125C. * See appropiate test circuit (Figure 2)
Mar3-07
SPX43 Precision Adjustable Shunt Regulator
(c) 2007 Sipex Corporation
2
CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
ppm
0
%
0
mV
0
VREF
* TC in mV/C =
T
VREF(mV) TA
-10 5000 0.5
* TC in %/C =
( (
VREF x 100 VREF at 25C) TA VREF x 106 VREF at 25C) TA
0
15
30
45
60
75
90
105
* TC in ppm/C =
Junction Temperature (C)
0.07 mV/C 0.003 %/C 27 ppm/C
Figure 1. VREFVS Temperature.
TEST CIRCUITS
VIN VKA= VREF
VIN VKA
VIN VKA
IREF
IK
R1 (VREF) R2
IK (OFF)
IREF
IK
Figure 2. Test Circuit for VKA= V REF
Figure 3. Test Circuit for VKA> V REF
Figure 4. Test Circuit for IKOFF
Mar3-07
SPX43 Precision Adjustable Shunt Regulator
(c) 2007 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
150 125 100
IK Cathode Current (mA)
VKA= V REF 0C to 105C
2.53 2.52
VREF Reference Voltage (V)
VKA= V REF IK= 10mA
75 50 25 0 -25 -50 -75 -100 -2 -1 0 1 2 VKA Cathode Voltage (V) 3
2.51 2.50 2.49 2.48 2.47 2.46 2.45 -60 -30 0 30 60 90 120
TA Ambient Temperature (C)
Figure 5. High Current Operating Characteristics
Figure 6. Reference Voltage VS Ambient Tempetature
900 700
IK Cathode Current (A)
VKA= V REF 0to 105 C
IREF Reference Input Current (A)
800 600 500 400 300 200 100 0 -100 -200 -1.0
3.0 2.5 2.0 1.5 1.0 0.5 0 -60
R1 = 10k R2 = IK= 10mA
105C 25C -0C
1.0 2.0 VKA Cathode Voltage (V)
0
3.0
-30
0
30
60
90
120
TA Ambient Temperature (C)
Figure 7. Low Current Operating Characteristics
Figure 8. Reference Input Current VS Ambient Temperature
70 60 50 40 30 20 10 0 10 VKA= V REF IK= 10mA TA= 25 C 100 1K 10K 100K
0
-10 0C
VREF (mV)
-20
25C 75C
-30 IKA= 10mA -40
125C
-50 0
3
6
9
12 15 18
21
24
27 30
VKACathode Voltage (V)
Noise Voltage nV Hz
f Frequency (Hz)
Figure 9. Reference Voltage Line Regulation VS Cathode Voltage and TAMBIENT
Mar3-07
Figure 10. Noise Voltage VS Frequency
SPX43 Precision Adjustable Shunt Regulator
(c) 2007 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
0.150
ZKA Dynamic Impedance ( )
VKA= V REF IK= 1 to 100mA f 1kHz
REF LEVEL 60.000dB 0.0deg /DIV 10.000dB 45.000deg MARKER 19 422 MAG (A/R) MARKER 19 422 PHASE (A/R) 611.000Hz -0.125dB 611.000Hz 46.717deg
0.125 0.100 0.075 0.050 0.025 0.0 -60
PHASE
GAIN
-30
0
30
60
90
120
TAFree Air Temperature
10
100
1K
10K
100K
1M
10M
START 10.000Hz
STOP 50 000 000.000Hz
Figure 11. Low Frequency Dynamic Output Impedance VS TAMBIENT
Figure 12. Small Signal Gain and Phase VS Frequency; IK= 10mA, T A= 25 C
VOUT 15k IK 230
VIN
9F
VOUT
VIN
8.25k GND
Figure 13. Test Circuit for Gain and Phase Frequency Response
Figure 14. Frequency = 100kHz, IK = 10mA, TA= 25 C
VIN 250
IK Cathode Current (mA)
100 90
A: VKA= V REF B: VKA= 5V at IK=10mA C: VKA=10V at IK=10mA D: VKA=15V at IK=10mA C
VOUT IK fp = 100kHz 50
80 70 60 50 40
STABLE
30 20 10
TA = 25C B
A
STABLE
GND
Figure 15. Test Circuit for Pulse Response
Mar3-07
0 100
D
101
102
103
104
105
106
107
CL Load Capacitance (pF)
Figure 16. Stability Boundary Conditions
(c) 2007 Sipex Corporation
SPX43 Precision Adjustable Shunt Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
150 IK
100
TA = 25 C IK =1mA to 100mA
ZKA - Dynamic
R
10
CL
1.0
10k
0.1
0.01
1K
10K
100K
1M
10M
f - Frequency (Hz)
Figure 17. Test Circuit for Stability
Figure 18. Dynamic Output Impedance TA= 25 C, IK= 1 to 100mA
100
VIN
R3
VOUT
IKOFF Cathode Current (nA)
10
VKA= 36V VREF= 0V
1
R1 0.1% VREF
SPX1431
0.1
R2 0.1%
0.01 -50 0 50 100 150
TA Ambient Temperature (C)
Figure 19. Off State Leakage
Figure 20. Shunt Regulator VOUT = (1+R1/R2)VREF
VIN ISINK R2
VOUT
R3
Q1
Isolated Feedback
Opto Isolator
R1 0.1%
R3 sets feedback gain, C1 provides feedback compensation
SPX1431 R1 0.1%
C2 + SPX1431
C1
R2 0.1%
VOUTRTN
Figure 21. Constant Current, Sink, ISINK= V REF/R1
Mar3-07
Figure 22. Reference Amplifier for Isolated Feedback in Off-Line DC-DC Converters
(c) 2007 Sipex Corporation
SPX43 Precision Adjustable Shunt Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
VIN R5 R4
VIN
VOUT
R1 0.1%
R3
C1 SPX1431
R1 0.1% R2 0.1%
R3 VOUT
R2 0.1% SPX1431
Q1
Figure 23. Precision High Current Series Regulator VOUT= (1+R1/R2)V REF
Figure 24. High Current Shunt Regulator VOUT= (1+R1/R2)V REF
VCC
R2
* Resistor values are chosen such that the effect to IREFis negligible .
VOUT
VIN
R1
SPX1431
Figure 25. Single Supply Comparator with Temperature Compensated Threshold. VINthreshold = 2.5V
PACKAGE PINOUTS
8-Pin Surface Mount (S) SOT-23-5 (M5)
REF CATHODE ANODE ANODE N/C 1 2 3 4 8 7 6 5 REF ANODE ANODE N/C 5 1 N/C 2 ANODE 4 3 1 REF 2 3 CATHODE REF CATHODE 1 2 3
SOT-89 (M1)
TO-92 (N)
N/C CATHODE
ANODE
ANODE
Top View Top View
Mar3-07
Top View
Bottom View
SPX43 Precision Adjustable Shunt Regulator
(c) 2007 Sipex Corporation
7
Package: 8 Pin nSOic
Mar3-07
SPX43 Precision Adjustable Shunt Regulator
(c) 2007 Sipex Corporation
Package: 5 Pin SOT-23
Mar3-07
SPX43 Precision Adjustable Shunt Regulator
(c) 2007 Sipex Corporation
Package: 3 Pin SOT-89
Mar3-07
SPX43 Precision Adjustable Shunt Regulator
(c) 2007 Sipex Corporation
0
Package: 3 Pin TO-92
Mar3-07
SPX43 Precision Adjustable Shunt Regulator
(c) 2007 Sipex Corporation
ORDeRing inFORMaTiOn
Part number
SPX43M SPX43M/TR SPX43M-L SPX43M-L/TR SPX43M SPX43M/TR SPX43M-L SPX43M-L/TR SPX43N SPX43N/TR SPX43N-L SPX43N-L/TR SPX43S SPX43S/TR SPX43S-L SPX43S-L/TR
Package RoHS Status code
SOT--3 SOT--3 SOT--3 SOT--3 SOT-23- SOT-23- SOT-23- SOT-23- TO-2 TO-2 TO-2 TO-2 NSOIC NSOIC NSOIC NSOIC Active Active Active Active EOL EOL EOL EOL EOL OBS EOL EOL EOL EOL EOL EOL
Pack Quantity
Bulk 200 Tape & Reel Bulk 200 Tape & Reel Bulk 200 Tape & Reel Bulk 200 Tape & Reel Bulk 2000 Tape & Reel Bulk 2000 Tape & Reel Bulk 200 Tape & Reel Bulk 200 Tape & Reel

Solved by
Sipex corporation
TM
Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 03 TEL: (40) 34-700 FAX: (40) 3-700
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 herein; neither does it convey any license under its patent rights nor the rights of others. Mar3-07 SPX43 Precision Adjustable Shunt Regulator (c) 2007 Sipex Corporation
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