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SPX431L Precision Adjustable Shunt Regulator
FEATURES Tight Voltage Tolerance 0.5% at 10mA Wide Operating Current 1mA to 100mA Extended Temperature Range: 0C to 105C Low Temperature Coefficient 30 ppm/C Improved Replacement in Performance for TL431 and AS431 Low Cost Solution APPLICATIONS Battery Operating Equipment Adjustable Supplies Switching Power Supplies
ANODE
SPX431L
3 Pin SOT-23
1
REF
CATHODE
Now Available in Lead Free Packaging

Error Amplifiers Single Supply Amplifier Monitors / VCRs / TVs Personal Computers DESCRIPTION The SPX431L is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. The SPX431L acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX431L's thermal stability, wide operating current (100mA) and temperature range (0C to 105C) makes it suitable for a variety of applications that require a low cost, high performance solution. SPX431L 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 manufacturer's assembly line and contribute a significant cost savings. The output voltage may be adjusted to any value between VREF and 20V with two external resistors. The SPX431L is available in TO-92, SOIC-8, SOT-89, and SOT-23-3 packages. BLOCK DIAGRAM
Cathode (K)
Reference (R)
+ 2.5V
Anode (A)
Date: 5/25/04 SPX431L Precision Adjustable Shunt Regulator (c) Copyright 2004 Sipex Corporation5
1
ABSOLUTE MAXIMUM RATINGS
Cathode-Anode Reverse Breakdown VKA ....................................... 20V Anode-Cathode Forward Current, (<10ms) IAK ................................. 1A Operating Cathode Current IKA .................................................. 100mA Reference Input Current IREF ........................................................ 10mA Continuos 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 Lead Temperature (Soldering 10 sec.) TL .................................. 300C 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 20 10 UNIT V mA
TYPICAL THERMAL RESISTANCES
PACKAGE TO-92 SOT-23 SOIC-8 SOT-89 0JA 0JC TYPICAL DERATING 6.3 mW/C 1.7 mW/C 5.7 mW/C 9.1 mW/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 >25.
ELECTRICAL CHARACTERISTICS
Electrical characteristics at 25C IK = 10mA VK = VREF, unless otherwise specified. PARAMETER SPX431LA Reference Voltage VREF withTemp.* Ratio of Change in VREF to Cathode Voltage Reference Input Current IREF Temp Deviation Min IK for Regulation Off State Leakage Dynamic Output Impedance SPX431L Reference Voltage VREF withTemp.* Ratio of Change in VREF to Cathode Voltage Reference Input Current IREF Temp Deviation Min IK for Regulation Off State Leakage Dynamic Output Impedance VREF TC VREF VK IREF IREF IK(MIN) IK(OFF) ZKA 2 2 3 3 3 2 4 2 VREF = 0V, VKA = 20V z 1kHz IK = 1 to 100mA TJ = 0C to 105C VREF to 10V 10V to 20V -2.7 -2.0 2.470 2.495 0.07 -1.0 -0.4 0.7 0.4 0.4 0.04 0.15 2.520 0.20 0.3 4.0 1.2 1.0 1.0 0.5 A A mA A V mV/C mV/V VREF TC VREF VK IREF IREF IK(MIN) IK(OFF) ZKA 2 2 3 3 3 2 4 2 VREF = 0V, VKA = 20V z 1kHz IK = 1 to 100mA TJ = 0C to 105C VREF to 10V 10V to 20V -2.7 -2.0 2.490 2.503 0.07 -1.0 -0.4 0.7 0.4 0.4 0.04 0.15 2.515 0.20 0.3 4.0 1.2 1.0 1.0 0.5 A A mA A V mV/C mV/V SYMBOL FIGURE CONDITIONS MIN TYP MAX UNITS
Date: 5/25/04
SPX431L Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation5
2
ELECTRICAL CHARACTERISTICS
Electrical characteristics at 25C IK = 10mA VK = VREF, unless otherwise specified. PARAMETER SPX431LC Reference Voltage VREF withTemp.* Ratio of Change in VREF to Cathode Voltage Reference Input Current IREF Temp Deviation Min IK for Regulation Off State Leakage VREF TC VREF VK IREF IREF IK(MIN) IK(OFF) 2 2 3 3 3 2 4 2 VREF = 0V, VKA = 16V z 1kHz IK = 1 to 100mA TJ = 0C to 105C VREF to 10V 10V to 20V -2.7 -2.0 2.445 2.495 0.07 -1.0 -0.4 0.7 0.4 0.4 0.04 0.15 2.545 0.20 0.3 4.0 1.2 1.0 1.0 0.5 A A mA A V mV/C mV/V SYMBOL FIGURE CONDITIONS MIN TYP MAX UNITS
Dynamic Output ZKA Impedance Operating Range (TJ) = 0C to 105C. * See appropiate test circuit (Figure 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 =
(V (V
VREF
REF
at 25C)
x 100
TA VREF
REF
0
15
30
45
60
75
90
105
* TC in ppm/C =
at 25C)
x 106
Junction Temperature (C)
TA
0.07 mV/C 0.003 %/C 27 ppm/C
Figure 1. VREF VS Temperature.
Date: 5/25/04
SPX431L Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation5
3
TEST CIRCUITS
VIN VKA = VREF
VIN
VKA
VIN
VKA
IK (OFF) IREF IK
R1 IREF (VREF) R2
IK
Figure 2. Test Circuit for VKA = VREF
Figure 3. Test Circuit for VKA > VREF
Figure 4. Test Circuit for IKOFF
TYPICAL PERFORMANCE CHARACTERISTICS
150 125 100
IK Cathode Current (mA)
VKA = VREF 0C to 105C
2.53 2.52
VREF Reference Voltage (V)
VKA = VREF 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
800 700 IK Cathode Current (A) 600 500 400 300 200 100 0 -100 -200 -1.0
IREF Reference Input Current (A)
900
VKA = VREF 0 to 105C
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.
Date: 5/25/04
Figure 8. Reference Input Current VS Ambient Temperature.
(c) Copyright 2004 Sipex Corporation5
SPX431L Precision Adjustable Shunt Regulator
4
TYPICAL PERFORMANCE CHARACTERISTICS
0
70 60
-10 0C
VREF (mV)
Noise Voltage nV/Hz
50 40 30 20 10 0 10 VKA = VREF IK = 10mA TA = 25C 100 1K
f Frecuency (Hz)
-20
25C 75C
-30 IKA = 10mA -40 125C
-50 0
3
6
9
12 15
18
21
24
27 30
10K
100K
VKA Cathode Voltage (V)
Figure 9. Reference Voltage Line Regulation VS Cathode Voltage and TAMBIENT
0.150
Figure 10. Noise Voltage VS Frequency
ZKA Dynamic Impedance ()
0.125 0.100 0.075 0.050
VKA = VREF IK = 1 to 100mA f1kHz
REF LEVEL 60.000dB 0.0deg 60dB 50dB
/DIV 10.000dB 45.000deg
MARKER 25 297 698.000 Hz MAG (A/R) -0.025 dB MARKER 25 297 698.000 Hz PHASE (A/R) 93.320 deg 215 180 PHASE 135 90 45 0 GAIN -45 -90 -135 -180 -215
40dB 30dB 20dB 10dB 0dB
0.025 0.0 -60 -30 0 30 60 90 120 TA Free Air Temperature
-10dB -20dB -30dB -40dB 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, TA = 25C
VOUT
VIN
9F
15k
IK
230
VOUT
VIN
8.25k GND
Figure 13. Test Circuit for Gain and Phase Frequency Response
Date: 5/25/04
Figure 14. FZ = 100kHz, IK = 10mA, TA = 25C
SPX431L Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation5
5
TYPICAL PERFORMANCE CHARACTERISTICS
VIN 250
IK Cathode Current (mA)
100 90
A: VKA = VREF 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
A
STABLE
30 20 10 0 100
TA = 25C B D
GND
Figure 15. Test Circuit for Pulse Response
101
102
103
104
105
106
107
CL Load Capacitance (pF)
Figure 16. Stability Boundry Conditions
100
150 IK R
ZKA Dynamic Impedance ()
TA = 25C IK = 1 to 100mA
10
CL
1.0
10k
0.1
0.01 1K
10K
100K
1M
10M
F Frecuency (Hz)
Figure 17. Test Circuit for Stability
Figure 18. Dynamic Output Impedance TA = 25C, IK = 1 to 100mA
100
VIN
R3
VOUT
IKOFF Cathode Current (nA)
10
VKA = 20V VREF = 0V
1
R1 0.1% VREF
SPX431L
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
Date: 5/25/04
SPX431L Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation5
6
TYPICAL PERFORMANCE CHARACTERISTICS
VIN ISINK R2 Q1
Opto Isolator R3 R1 0.1% VOUT
Isolated Feedback
R3 sets feedback gain, C1 provides feedback compensation
SPX431L R1 0.1%
C2 + SPX431L
C1
R2 0.1% VOUTRTN
Figure 21. Constant Current Sink, ISINK = VREF/R1
Figure 22. Reference Amplifier for Isolated Feedback in Off-Line DC-DC Converters
VIN R5 R4
VIN
VOUT
R1 0.1%
R3
C1 SPX431L
R1 0.1% R2 0.1%
R3 VOUT
R2 0.1% SPX431L
Q1
Figure 23. Precision High Current Series Regulator VOUT = (1+R1/R2)VREF
Figure 24. High Current Shunt regulator VOUT = (1+R1/R2)VREF
VCC
* Resistor values are chosen such that the effect to IREF is negligible.
R2
VIN
R1
VOUT
SPX431L
Figure 25. Single Supply Comparator with Temperature Compensated Threshold. VIN threshold = 2.5V.
Date: 5/25/04 SPX431L Precision Adjustable Shunt Regulator (c) Copyright 2004 Sipex Corporation5
7
PINOUTS
8-Pin SOIC (S)
CATHODE ANODE ANODE N/C 1 2 3 4 8 7 6 5 REF ANODE ANODE ANODE N/C 1 REF 2 CATHODE 1 2 3 1 2 3
SOT-23-3 (M)
3
SOT-89 (M1)
TO-92 (N)
REF
CATHODE ANODE
REF ANODE
CATHODE
Top View
Top View
Top View
Bottom View
PACKAGE: 8 PIN NSOIC
D e
E/2 E1 E E1/2
SEE VIEW C
1 INDEX AREA (D/2 X E1/2) A b
O1
TOP VIEW
Gauge Plane L2 Seating Plane
O1
L L1
O
VIEW C
A A2 SEATING PLANE A1
SIDE VIEW
8 Pin NSOIC
(JEDEC MS-012, AA - VARIATION)
DIMENSIONS Minimum/Maximum (mm)
WITH PLATING
b
COMMON HEIGHT DIMENSION
SYMBOL A A1 A2 b c D E E1 e L L1 L2 O O1
MIN NOM MAX 1.75 1.35 0.25 0.10 1.25 1.65 0.31 0.51 0.17 0.25 4.90 BSC 6.00 BSC 3.90 BSC 1.27 BSC 0.40 1.27 1.04 REF 0.25 BSC 0 8 5 15
c
BASE METAL
CONTACT AREA
PACKAGE: 8 PIN NSOIC
(c) Copyright 2004 Sipex Corporation5
Date: 5/25/04
SPX431L Precision Adjustable Shunt Regulator
8
PACKAGE: 3 PIN SOT-23
D
b 3
B B
E1 E
SEE VIEW C
VIEW A-A
1 e
2
e1
L L1
Gauge Plane Seating Plane
O
VIEW C
3 PIN SOT-23 JEDEC TO-236 (AB) Variation A A1 A2 b c D e e1 E E1 L L1 O 0 2.10 1.20 0.40 Dimensions in (mm)
A
MIN 0.89 0.01 0.88 0.30 0.08 2.80
NOM MAX 0.95 2.90 1.12 0.10 1.02 0.50 0.20 3.04
A
A1 A A2
Seating Plane
C
SIDE VIEW
b
WITH PLATING
0.95 BSC 1.90 BSC 1.30 0.50 0.54 REF 8 2.64 1.40 0.60
c
BASE METAL SECTION B-B
3 PIN SOT-23
Date: 5/25/04 SPX431L Precision Adjustable Shunt Regulator (c) Copyright 2004 Sipex Corporation5
9
PACKAGE: 3 PIN SOT-89
D
D1 3
O1.0
E H
5(2x)
L 1 e 2
e1
C
Dimensions in (mm) 3 PIN SOT-89 MIN A b L b1 C D D1 H E e e1 1.40 0.36 0.80 0.41 0.38 4.40 1.40 3.94 2.40 1.45 2.90 NOM MAX 1.50 0.42 0.47 0.40 4.50 1.60 2.50 1.50 3.00 1.60 0.48 1.20 0.53 0.43 4.60 1.75 4.25 2.60 1.55 3.10
8(2x)
Ro.15
b
b1
b
3 PIN SOT-89
Date: 5/25/04
SPX431L Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation5
10
PACKAGE: 3 PIN TO-92
L
e
e1
W
D
A
b
S1
3 PIN TO-92
DIMENSIONS IN INCHES
SYMBOL A b E e e1 L R S1 W D a
MIN NOM .170 .014 .130 .095 .045 .500 .085 .045 .016 .175 4 -
MAX
.195
R
.020 .155 .105 .055 .610 .095 .060 0.022
.195 6
E
a(2x)
3 PIN TO-92
Date: 5/25/04
SPX431L Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation5
11
ORDERING INFORMATION PART NUMBER ACCURACY OUTPUT VOLTAGE PACKAGES SPX431LAM ........................ 0.5% .............. 2.503V ................................ 3-Pin SOT-23 SPX431LAM/TR .................. 0.5% .............. 2.503V ................................ 3-Pin SOT-23 SPX431LAM1 ...................... 0.5% .............. 2.503V ................................ 3-Pin SOT-89 SPX431LAM1/TR ................ 0.5% .............. 2.503V ................................ 3-Pin SOT-89 SPX431LAS ........................ 0.5% .............. 2.503V .................................. 8-Pin nSOIC SPX431LAS/TR ................... 0.5% .............. 2.503V .................................. 8-Pin nSOIC SPX431LAN ........................ 0.5% .............. 2.503V .................................. 3-Pin TO-92 SPX431LAN/TR .................. 0.5% .............. 2.503V .................................. 3-Pin TO-92 SPX431LM .......................... SPX431LM/TR .................... SPX431LM1 ........................ SPX431LM1/TR .................. SPX431LS ........................... SPX431LS/TR ..................... SPX431LN ........................... SPX431LN/TR ..................... SPX431LCM ........................ SPX431LCM/TR .................. SPX431LCM1 ...................... SPX431LCM1/TR ................ SPX431LCS ........................ SPX431LCS/TR .................. SPX431LCN ........................ SPX431LCN/TR .................. 1.0% .............. 2.495V ................................ 3-Pin SOT-23 1.0% .............. 2.495V ................................ 3-Pin SOT-23 1.0% .............. 2.495V ................................ 3-Pin SOT-89 1.0% .............. 2.495V ................................ 3-Pin SOT-89 1.0% .............. 2.495V .................................. 8-Pin nSOIC 1.0% .............. 2.495V .................................. 8-Pin nSOIC 1.0% .............. 2.495V .................................. 3-Pin TO-92 1.0% .............. 2.495V .................................. 3-Pin TO-92 2.0% .............. 2.495V ................................ 3-Pin SOT-23 2.0% .............. 2.495V ................................ 3-Pin SOT-23 2.0% .............. 2.495V ................................ 3-Pin SOT-89 2.0% .............. 2.495V ................................ 3-Pin SOT-89 2.0% .............. 2.495V .................................. 8-Pin nSOIC 2.0% .............. 2.495V .................................. 8-Pin nSOIC 2.0% .............. 2.495V .................................. 3-Pin TO-92 2.0% .............. 2.495V .................................. 3-Pin TO-92
Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX431LM/TR = standard; SPX431LM-L/TR = lead free /TR = Tape and Reel Pack quantity is 2,000 for TO-92, 2,500 for SOT-89, SOT-23, and SOT-23.
Corporation
ANALOG EXCELLENCE
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
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.
Date: 5/25/04
SPX431L Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation5
12

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