SPX431
Precision Adjustable Shunt Regulator
FEATURES APPLICATIONS
• Trimmed Bandgap to 0.5% • Battery Operating Equipments • Wide Operating Current..........................1mA to 150mA • Adjustable Supplies • Extended Temperature Range....................0°C to 105°C • Switching Power Supplies • Low Temperature Coefficient ............................30 ppm/°C • Error Amplifiers • Offered in TO-92, SOIC, SOT-89, SOT-23-5 • Single Supply Amplifier • Improved Replacement in Performance for TL431 • Monitors / VCR / TV • Low Cost Solution • Personal Computers
PRODUCT DESCRIPTION
The SPX431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate 0.5% bandgap reference. SPX431 acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX431 thermal stability, wide operating current (150mA) and temperature range (0°C to 105°C) makes it suitable for all variety of application that are looking for a low cost solution with high performance. SPX431 tolerance of 0.5% 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 manufactures assembly line and contribute a significant cost savings.
The output voltage may be adjusted to any value between VREF and 36 volts with two external resistors. The SPX431 is operating an extended temperature range of 0°C to 105°C. The SPX431 is available in TO-92, SO-8, SOT-89, and SOT-23-5 packages.
PIN CONFIGURATIONS
8-Pin Surface Mount (S)SOT-23-5 (M5)REF
ANODE4SOT-89 (M1)TO-92 (N)123CATHODEANODEANODE
N/C
1234
87
REFANODEANODEN/C
5SPX4311N/C
2N/C
3
CATHODE
1SPX43123CATHODE
REFCATHODESPX43165
REF
ANODE
ANODETop ViewTop ViewTop ViewBottom View
Rev. 10/30/00
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SPX431
ABSOLUTE MAXIMUM RATINGS
CATHODE (K)REFERENCE
(R)
+-2.5VANODE (A)PARAMETER SYMBOL RATING UNITS Cathode-Anode Reverse Breakdown VKA 37 V Anode-Cathode Forward Current IAK 1 A Operating Cathode Current IKA 150 mA Reference Input Current IREF 10 mA
PD Continuous Power Dissipation at 25° C
mW 775 TO-92
mW 200 SOT-23
mW 750 8L SOIC
mW 1000 SOT-89
Junction Temperature TJ 150 °C Storage Temperature TSTG - 65 to 150 °C Lead Temperature (Soldering 10 sec.) TL 300 °C
Stresses greater than those listed under ABSULUTE 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 TYPICAL THERMAL RESISTANCES
PARAMETER SYMBOL RATING UNIT PACKAGE 0JA 0JC TYPICAL DERATING Cathode Voltage VKA VREF to 20 V TO-92 160 °C/W 80 °C/W 6.3 mW/°C Cathode Current IK 10 mA SOT-23 575 °C/W 150 °C/W 1.7 mW/°C SOIC 175 °C/W 45 °C/W 5.7 mW/°C SOT-89 110 °C/W 8 °C/W 9.1 mW/°C
Rev. 10/30/00
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SPX431
ELECTRICAL CHARACTERISTICS at 25°C IK @ 10mA VK = VREF, unless otherwise specified.
Parameter
Reference Voltage ∆VREF with Temp.∗
Ratio of Change in VREF to Cathode Voltage
Reference Input Current IREF Temp Deviation Min IK for Regulation Off State Leakage
Dynamic Output Impedance
TC = Test Circuit
Symbol
VREF
Test Conditions Test Circuit SPX431 Unit
Min Typ Max 1 2.490 2.503 2.515 V TA = 25°C
1 2.469 2.536 V Over Temp.
TC 1 0.07 0.20 mV/°C
-2.7 -1.0 mV/V VREF to 10V ∆ VREF 10V to 36V 2 -2 -0.4 0.3 ∆VK
IREF 2 0.7 4 µA
Over Temp. 2 0.4 1.2 ∆IREF µA
IK(MIN) 1 0.4 1 mA IK(OFF) VREF = 0V, 0.04 250 nA VKA = 36V 3
ZKA 1 0.15 0.5 Ω
TC in %/°C =TC in ppm/°C =VKAVINIK
2Figure 1a. Test Circuit 1Figure 1b. Test Circuit 2Figure 1c. Test Circuit 3))
Calculating Average Temperature Coefficient (TC)
000
∆VREF ∆Τ -10 50000.5 -20-55-250255075100125
Temperature (°C) 0.06 mV/°C 0.002 %/°C
24 ppm/°C
TEST CIRCUITS
VINVKA = VREFVIN
IREFIK
R1 IREF(VREF)
Rppm%mVTC in mV/°C =∆VREF (mV)∆TA∆VREFVREF at 25°C∆TA∆VREFVREF at 25°C∆TA))x 100x 106VKAIK (OFF)
Rev. 10/30/00
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SPX431
TYPICAL PERFORMANCE CURVES
Low Current Operating Characteristics 900 V = V800Temperature Range: -0°C to 125 °C
700 600 500 400 105 °C300
25 °C 200-0 °C 100 0
-100
-200-1.001.02.03.0 V - Cathode Voltage (V) Figure 2
Off State Leakage 100
V = 36V V = 0V 10
1 0.1 0.01 -60-300306090120T- Ambient Temperature ( °C)
Figure 4
KAREFHigh Current Operating Characteristics1501251007550250-25-50-75-100-2-10123VKA = VREFTemperature Range: - 0°C to 105 °CIK - Cathode Current (µA)IK - Cathode Current (mA)KAVKA - Cathode Voltage (V)
Figure 3Reference Voltage vs. Ambient Temperature2.53KAREF2.52 VKA = VREF IK = 10 mAIZ off - Off State Cathode Current (nA)VREF - Reference Voltage (V)2.512.50VREF = 2.500 V at 25 °C2.492.482.472.462.45-60-300306090120A TA - Ambient Temperature ( °C)
Figure 5
Rev. 10/30/00
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SPX431
TYPICAL PERFORMANCE CURVES Reference Input Current3.0 R1 = 10 kΩR2 = ∞
I = 10 mA2.5
2.0
1.5
1.0
0.5
0
-60-300306090 T - Ambient Temperature ( °C) Figure 6 Noise Voltage70
60
50
40
30
20
10 V = VI = 10 mA T = 25°C0 101001 k10 k f - Frequency (Hz)Figure 8
KReference Voltage Line Regulation0-10µA)IREF - Reference Input Current (VKA - Cathode Voltage (V)0 °C-2025 °C75 °C-30105 °C-40-50120036912151821242730A
VKA - Cathode Voltage (V)Figure 7Low Frequency Dynamic Output Impedance0.150VKA = VREFIKA = 1 to 100 mAf < 1 kHz0.125ZKA - Dynamic Impedance ( Ω )Noise Voltage nV/√Hz0.1000.0750.0500.025KAREFKA0.0-60100 k-300306090120TA - Free Air TemperatureFigure 9
Rev. 10/30/00
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SPX431
TYPICAL PERFORMANCE CURVES Dynamic Output Impedance
100 T = 25 °C = 1 to 100 mAI
10
1.0 0.1
0.01
1 k10 k100 k1 M
f - Frequency (Hz) Figure 10
Small Signal Voltage Gain vs. Frequency 70Temperature Range: -0°C to 105 °C
60 I = 10 mA
50
40 9 µF30
20 10
0 1 k10 k100 k1 M10 M f - Frequency (Hz) Figure 11
AKZKA - Dynamic Impedance10 MAV - Small Signal Voltage Gain (dB)KOUT15 kIK230 Ω8.25 kGND
Rev. 10/30/00
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SPX431
TYPICAL PERFORMANCE CURVES Pulse Response INPUT
OUTPUT
t - Time (µs) Stability Boundary Conditions A: V = VB: V = 5V at I = 10 mA C: V = 10V at I = 10 mAD: V= 15V at I = 10 mA C STABILITYREGION A
B T = 25 °CD
CL - Load Capacitance (pF)
65Input and Output Voltages (V)INPUTMONITOR220 ΩOUT43250 ΩfP = 100 kHz1GND0-10123456789101112Figure 12100KAKAKAREF90KKKKA 8070IK - Cathode Current (mA)150 ΩIK605040CL3010 k2010A0100101102103104105106107Figure 13
Rev. 10/30/00
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SPX431
ORDERING INFORMATION
Ordering No. Precision Output Accuracy
SPX431M5 SPX431M1 SPX431S SPX431N
Packages
5 Lead SOT-23 5 Lead SOT-89 8 Lead SOIC 3 Lead TO-92
0.5% 0.5% 0.5% 0.5% 2.5V 2.5V 2.5V 2.5V
Corporation
Sipex Corporation
SIGNAL PROCESSING EXCELLENCE
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. 10/30/00
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