cat431l Catalyst Semiconductor, cat431l Datasheet

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cat431l

Manufacturer Part Number
cat431l
Description
Low-voltage Adjustable Precision Voltage Reference
Manufacturer
Catalyst Semiconductor
Datasheet
© 2003 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT431L
Low-Voltage Adjustable Precision Voltage Reference
- 0.5% Tolerance
FEATURES
APPLICATIONS
DESCRIPTION
The CAT431L is a low-voltage three-terminal
adjustable shunt voltage reference with guaranteed
thermal stability over the industrial temperature range.
The CAT431L has a lower 1.24V reference and wider
operating current range than the widely used TL431
and TL431A shunt-regulator references. Compared
to the TLV431/A, the CAT431L 1.24V reference is two
times more accurate.
FUNCTIONAL DIAGRAM
SMPS control loop
Shunt regulator
Low temperature coefficient voltage reference
Low startup overshoot
Wide current operation: 40 A to 100mA
Low temperature coefficient reference: +12mV
max deviation over temperature
Accurate 1.24V reference voltage: +0.5%
(+6mV) at 25 C
1.24
REF
V REF
CATHODE
+
ANODE
- SOT23 and TO92 Packages
1
Minimal overshoot at startup and wide AC bandwidth
make the CAT431L easy to apply in a wide set of
applications. When used with an opto-coupler, the
CAT431L is an ideal voltage reference in isolated
feedback circuits for 3V to 3.3V switch-mode power
supplies.
Low dynamic impedance: 0.3 at 1kHz
Compact 3-lead SOT23 package option
Industrial temperature range: -40 C to 85 C
Adjustable output voltage: V
Current limiting
Over/Under voltage monitor
3V Off-line switching regulators
- Low Startup Overshoot
REF
CATHODE
ANODE
REF
to 6V
Doc. No. 4006, Rev. J

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cat431l Summary of contents

Page 1

... Current limiting Over/Under voltage monitor 3V Off-line switching regulators Minimal overshoot at startup and wide AC bandwidth make the CAT431L easy to apply in a wide set of applications. When used with an opto-coupler, the CAT431L is an ideal voltage reference in isolated feedback circuits for 3V to 3.3V switch-mode power supplies. ...

Page 2

PIN CONFIGURATION SOT-23 TOP VIEW 2 CATH ANODE 3 1 REF PIN DESCRIPTIONS ...

Page 3

ABSOLUTE MAXIMUM RATINGS Cathode Voltage .................................................. 18V REF Current ........................................................ 3mA Cathode, Anode Currents ............................... 150mA Operating Junction Temperature ..................... 150 C Lead Soldering Temperature (10 sec) ............. 260 C Storage Temperature Range ........... - +150 C ELECTRICAL ...

Page 4

TYPICAL PERFORMANCE CHARACTERISTICS Reference Voltage vs. Junction Temperature 1.246 1.244 1.242 1.240 1.238 1.236 1.234 1.232 -50 - Junction Temperature ( C) Cathode Current vs. Cathode Voltage 150 100 50 0 -50 -100 -1 -0.5 0 ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Off-State Cathode Current vs. Junction Temperature -50 - Junction Temperature ( C) Open Loop Voltage Gain vs. Frequency 100 ...

Page 6

Doc. No. 4006, Rev ...

Page 7

... TYPICAL APPLICATIONS Shunt Voltage Regulator Flyback Converter with Optical Isolation ~ 120V Gate Drive V CC Controller GND Current Sense R1 0.1% V REF CAT431L R2 0. CAT431L REF 3.3V Doc. No. 4006, Rev. J ...

Page 8

PACKAGE OUTLINES 3 LEAD SOT-23 b PIN #3 PIN # (4X) NOTES: 1. ALL DIMENSIONS ARE IN INCHES & ARE IN MM. 2. PACKAGE OUTLINE DIMENSIONS INCLUSIVE OF METAL BURRS. 3. PACKAGE OUTLINE EXCLUSIVE ...

Page 9

LEAD SOT-23 2.900+0.100 NOTES: 1. ALL DIMENSIONS ARE IN MM. 2. PACKAGE OUTLINE DIMENSIONS INCLUSIVE OF METAL BURR. 3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.076MM. 4. ALL PACKAGE SURFACE TO BE MIRROR FINISH. ...

Page 10

LEAD TO92 NOTE : 1.0 All dimensions are in mm. 2.0 Dimension tolerance of 0.05 mm unless otherwise specified. 3.0 Solder dipping finish @ 63/37 Sn/Pb. 4.0 Burrs in trim @ 0.13 mm max. Doc. No. 4006, Rev. J ...

Page 11

... Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. ...

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