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SEAWARD ELECTRONICS
Adjustable Precision Shunt Regulator
Features
Low voltage operation (2.5V)
SE431
Description
The SE431 is a low voltage three terminal adjustable shunt regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage can be set to any value between VREF (approximately 2.5 V) to 18V with two external resistors. This device has a typical output impedance of 0.2. Active output circuitry provides a very sharp turn on characteristic, making this device excellent replacement for Zener diodes in many applications. The SE431 is characterized for operation from 0oC to 105oC, and five package options (SOT-23-3, SOT-23-5, SOP-8, TO-92 and SOT-89) allow the designer the opportunity to select the proper package for their applications.
Adjustable output voltage V0 = VREF to 18V Wide operating current range 120A to 100mA Low dynamic output impedance 0.2 (Typ.). Trimmed bandgap design up to + 0.5%. ESD rating is 5.5KV(Per MIL-STD-883D). Available in Lead Free Packages.
Application
Linear Regulators Adjustable Supplies Switching Power Supplies Battery Operated Computers Instrumentation Computer Disk Drives
Block Diagram Symbol Diagram
Cathode
Ref
Cathode
+
Vref Anode
Ref
Anode
All contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com * Page 1
SEAWARD ELECTRONICS
Adjustable Precision Shunt Regulator
SE431
Lead-Free Package
Marking Information
Package SOT-23-3 SC59-3L SOT-23-3 SOT-23-5L SOP-8 Marking SE431W S431W (SE431S) SE431W SE431 YYWW SE431 YYWW SE431 YYWW
YY is the year of production. 04 means the product is manufactured in year of 2004. WW is the week of Lead-free package is
Production Year Code
Starting with S, a bar on top of S is for production year 2001, and underlined S is for year 2002. The next character is marked on top for 2003, and underlined for 2004. The naming pattern continues with consecutive characters for later years.
Production Week Code
A-Z: 1-26 a-z: 27-52
Lead-free package is indicated by a dot on top of the week code.
SOT-89
production.
26 means the
product is manufactured in the 26th week.
indicated by LF after YYWW.
TO-92
Pin Configuration
SOT-23-3 SOT-23-3L (SC59-3L) SOT-23-3 (Order as SE431S) SOT-23-5L
TO-92 SOP-8 (Top View) SOT-89
All contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com * Page 2
SEAWARD ELECTRONICS
Adjustable Precision Shunt Regulator
SE431
Absolute Maximum Ratings
Parameter
Cathode Voltage Continuous Cathode Current Reference Current Operating Junction Temperature Range Storage Temperature Range
Symbol
VKA I KA I REF TJ TSTG
Maximum
18 150 10 150 -65 to 150 120 (SOT-89) 230 (SOT-23-3)
Units
V mA mA C C
Thermal Resistance
JA
230 (SOT-23-5L) 150 (SOP-8) 220 (TO-92)
C/W
Lead Temperature (Soldering) 10 seconds
TLEAD
260
C
Electrical Characteristics
TEST PARAMETER 0.5% Reference Voltage 1% 2% Deviation of reference voltage over full temperature range Ratio of change in reference voltage to the change in cathode voltage Reference current Deviation of Reference current over full temperature range Minimum cathode current regulation Off-state cathode current Dynamic impedance for IMIN IOFF ZKA 1 3 1 VKA = VREF VKA = 18V, VREF = 0 IKA = 1mA to 100mA, VKA = VREF, f 1kHZ ---0.2 0.1 0.2 1 1 0.7 mA A II(dev) 2 VI(dev) VREF ________ VKA IREF 2 2 1 VKA = VREF, IKA = 10mA TA = 0C to 105C IKA = 10mA, VKA = 10 V - VREF IKA = 10mA, R1=10k, R2 = IKA = 10mA, R1=10k, R2 = , TA = 0C to 105C VREF 1 VKA = VREF, IKA = 10mA SYMBOL CIRCUIT 2483 2470 2445 -2495 2495 2495 4 2507 2520 2545 25 mV mV TEST CONDITIONS MIN TYP MAX UNIT
--
-1.4
-2.7
mV/V
--
2
4
A
--
0.4
1.2
A
All contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com * Page 3
SEAWARD ELECTRONICS
Adjustable Precision Shunt Regulator
SE431
Typical Performance Characteristics
CATHODE CURRENT Vs. CATHODE VOLTAGE
150 125 100
800
CATHODE CURRENT Vs. CATHODE VOLTAGE
V K A = V ref TA = 25 o C 600
VKA = Vref TA = 25 oC
Cathode Current (mA)
75 50 25 0 -25 -50 -75
Cathode Current (A)
-2 -1 0 1 2 3
400
200
0
-100
- 200 -1 0 1 2 3
Cathode Voltage (V)
Cathode Voltage (V)
REFERENCE VOLTAGE Vs. JUNCTION TEMPERATURE
2520
3
REFERENCE INPUT CURRENT Vs. JUNCTION TEMPERATURE
R1 = 10k R2 = I KA =10mA
Reference Current (A)
0 20 40 60 80 100 120
Reference Voltage (mV)
2515 2510 2505 2500 2495 2490 2485
VKA =Vref IKA =10mA
2. 5 2 1. 5 1 0. 5 0 - 20
2480 - 60 - 40 - 20
0
20
40
60
80
o
100
120
Junction Temperature ( oC)
Junction Temperature ( C)
All contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com * Page 4
SEAWARD ELECTRONICS
Adjustable Precision Shunt Regulator
SE431
VKA
Test Circuits
Input
V KA
Input
I KA
VKA
Input
I off
I KA
R1 Iref
Vref
R2
Vref
R1 VKA = Vref (1+ ) + Iref x R1 R2
Test Circuit 1: VKA = VREF
Test Circuit 2: VKA > VREF
Test Circuit 3: Off State Current
Application Diagram
VIN
R
VOUT
R1 Vref R2 SE431
VOUT = Vref (1+
R1 ) R2
GND
Thermal Consideration
Package Power Rating (TA=25C)
SOT-23-3 (JA=230C/W) SOT-23-5L (JA=230C/W) TO-92 (JA=220C/W)
1. Maximum junction temperature is 125C 2. JA is measured with packages mounted onboard under still-air condition with 1W power applied. 3. Power rating is calculated using PD = (TJ - TA) /JA, where TJ denotes junction temperature and TA denotes ambient temperature.
Power Rating (TA=50C) 326mW 326mW 341mW
Power Rating (TA=70C) 239mW 239mW 250mW
435mW 435mW 455mW
All contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com * Page 5
SEAWARD ELECTRONICS OUTLINE DRAWING SOT-23-3
C J B H
Adjustable Precision Shunt Regulator
SE431
DIM A B C D E F G H J K L
N
DIMENSIONS INCHES MM MIN MAX MIN MAX
0.110 0.047 0.083 0.035 0.070 0.018 0.015 0.0005 0.034 0.003 0.120 0.055 0.104 0.040 0.080 0.024 0.020 0.004 0.040 0.007 0.027 2.80 1.20 2.10 0.89 1.78 0.45 0.37 0.013 0.887 0.085 3.04 1.40 2.64 1.03 2.05 0.60 0.51 0.10 1.02 0.18 0.69
D A E
F
G
K
L
OUTLINE DRAWING SC59-3L (SOT-23-3L)
H
A
DIM
A1
N
E
B
e1
D
L
Q
SC 59-3L
L1 C
A A1 B C D H E e e1 L1 L Q
DIMENSIONS INCHE MM MIN MAX MIN MAX 0.035 0.043 0.90 1.10 0.0004 0.005 0.01 0.13 0.012 0.020 0.30 0.50 0.004 0.008 0.09 0.20 0.110 0.122 2.80 3.10 0.098 0.122 2.50 3.10 0.059 0.067 1.50 1.70
0.037REF 0.075REF 0.008 0.014 0 0.022 0.031 10 0.95REF 1.90REF 0.20 0.35 0 0.55 0.80 10
OUTLINE DRAWING SOT-23-5L
K B H D
DIMN A B C D E F H J K
DIMENSIONS INCHES MM MIN MAX MIN MAX
0.110 0.059 0.036 0.014 0.0035 0.102 0.120 0.070 0.051 0.020 0.037 0.075 0.006 0.008 0.118 2.80 1.50 0.90 0.35 0.090 2.60 3.05 1.75 1.30 0.50 0.95 1.90 0.15 0.20 3.00
A
F E
C
J
All contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com * Page 6
SEAWARD ELECTRONICS OUTLINE DRAWING TO-92
A
Adjustable Precision Shunt Regulator
SE431
B D
DIMN A B E F G H J K
DIMENSIONS INCHES MM MIN MAX MIN MAX
0.175 0.170 0.500 0.016 0.045 0.095 0.080 0.125 0.205 0.210 0.610 0.021 0.055 0.105 0.105 0.165 4.445 4.318 12.70 0.407 1.143 2.413 2.032 3.175 5.207 5.334 15.50 0.533 1.397 2.667 2.667 4.191
E
G F H K
J
OUTLINE DRAWING SOP-8
1 2
D
8 7 6
B1
B
DIM A A1 B B1 C D H E
N
3 4
DIMENSIONS INCHES MM MIN MAX MIN MAX
0.0532 0.0688 0.0040 0.0098 0.0130 0.0200 0.050 BSC 0.0075 0.0098 0.1890 0.1968 0.2284 0.2440 0.1497 0.1574 1.35 1.75 0.10 0.25 0.33 0.51 1.27 BSC 0.19 0.25 4.80 5.00 5.80 6.20 3.80 4.00
5
A1 E H A
C
OUTLINE DRAWING SOT-89
N
SOT-89
A C D K L M J
DIM A B C D E F G H I J K L M
DIMENSIONS INCHES MM MIN MAX MIN MAX
0.173 0.181 0.159 0.167 0.067 0.075 0.051 0.059 0.094 0.102 0.035 0.047 0.118REF 0.059REF 0.016 0.020 0.055 0.063 0.014 0.016 10TYP 0.028REF 4.400 4.600 4.050 4.250 1.700 1.900 1.300 1.500 2.400 2.600 0.890 1.200 3.00REF 1.50REF 0.400 0.520 1.400 1.600 0.350 0.410 10TYP 0.70REF
B
F
E
H
G I
All contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com * Page 7
SEAWARD ELECTRONICS
Adjustable Precision Shunt Regulator
SE431
Customer Support
Seaward Electronics Incorporated - China Rm 1605, Building 1, International Pioneering Park, #1 Shangdi Xinxi Rd Haidian District, Beijing 100085, China Tel: 86-10-8289-5700/01/05 Fax: 86-10-8289-5706 Seaward Electronics Corporation - Taiwan 2F, #181, Sec. 3, Minquan East Rd, Taipei, Taiwan R.O.C Tel: 886-2-2712-0307 Fax: 886-2-2712-0191 Seaward Electronics Incorporated - North America 49 Showers Dr. J126 Mountain View, CA 94040, USA Tel: 1-408-821-6600 Last Updated - 3/23/2005
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