SC431 Semtech Corporation, SC431 Datasheet

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SC431

Manufacturer Part Number
SC431
Description
ADJUSTABLE SHUNT REGULATOR
Manufacturer
Semtech Corporation
Datasheet

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April 13, 1998
DESCRIPTION
The SC431 is a three terminal adjustable shunt regula-
tor with thermal stability guaranteed over temperature.
The output voltage can be adjusted to any value from
2.5V (V
SC431 has a typical dynamic output impedance of
0.25 . Active output circuitry provides a very sharp
turn on characteristic, making the SC431 an excellent
replacement for zener diodes.
The SC431 shunt regulator is available in three voltage
tolerances (0.5%, 1.0% and 2.0%) and three package
options (SOT-23-3, SO-8 and TO-92). The three volt-
age tolerances allow the designer the opportunity to
select the proper cost/tolerance for their application.
PIN CONFIGURATIONS
© 1998 SEMTECH CORP.
REF
) to 36V with two external resistors. The
SOT-23 -3 Lead (Top View)
SOIC 8 Lead (Top View)
TO-92 (Top View)
ADJUSTABLE SHUNT REGULATOR
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
FEATURES
APPLICATIONS
BLOCK DIAGRAM
SYMBOL DIAGRAM
652 MITCHELL ROAD NEWBURY PARK CA 91320
Wide operating current range 100µA to 150mA
Low dynamic output impedance 0.25
Trimmed bandgap design + 0.5%
Alternate for TL431, LM431 & AS431
Linear Regulators
Adjustable Supplies
Switching Power Supplies
Battery Operated Computers
Instrumentation
Computer Disk Drives
typ.
SC431
1

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SC431 Summary of contents

Page 1

... Active output circuitry provides a very sharp turn on characteristic, making the SC431 an excellent replacement for zener diodes. The SC431 shunt regulator is available in three voltage tolerances (0.5%, 1.0% and 2.0%) and three package options (SOT-23-3, SO-8 and TO-92). The three volt- age tolerances allow the designer the opportunity to select the proper cost/tolerance for their application ...

Page 2

... REF STG LEAD TOLERANCE 0.5% 1.0% SC431CS - .5 SC431CS - 1 SC431CSK - 1 SC431CZ - .5 SC431CZ - 1 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC431 Maximum Units 37 V 150 -40 to +150 °C -65 to +150 °C 160 °C/W 175 410 0.78 W 0.71 0.30 260 °C 2.0% T/R Quantity SC431CS - 2 2.5K SC431CSK - 2 3K SC431CZ - 2 TR=3K, TA=2K 2 ...

Page 3

... I = 10mA Z 0.4 1 =10mA 36V 0.04 0 REF 0.25 0 100 Z REF Test Circuit 2: V > REF Max Symbol 36 V 150 mA 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC431 SC431 1% SC431 2% MIN TYP MAX MIN TYP MAX -0.5 -2.7 -0.5 -2.7 -1.0 -2.0 -1.0 -2.0 0.5 4 0.5 4 0.4 1.2 0.4 1.2 0.04 0.5 0.04 0.5 0.25 0.5 0.25 0.5 100 100 Test Circuit 3: ...

Page 4

... REF 10 1 0.1 0.01 0.001 75 100 125 150 -50 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC431 REF (V) Z Reference Input Current vs. Junction Temperature - 100 T (°C) J Off-State Cathode Current vs. Junction Temperature = 36V = 0V ...

Page 5

... I exceed 200mA. Both of the following conditions must be met min 200 V R min I OUT 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC431 Gain and Phase Shift REF greater than the minimum Z . IN(min) ...

Page 6

... April 13, 1998 OUTLINE DRAWING SOT-23 OUTLINE DRAWING SO-8 OUTLINE DRAWING TO-92 © 1998 SEMTECH CORP. ADJUSTABLE SHUNT REGULATOR 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC431 6 ...

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