CAT431L Datasheet, PDF (1/11 Pages) Catalyst Semiconductor – Low-Voltage Adjustable Precision Voltage Reference

CAT431L
Low-Voltage Adjustable Precision Voltage Reference
- 0.5% Tolerance
- SOT23 and TO92 Packages
- Low Startup Overshoot
FEATURES
s Low startup overshoot
s Wide current operation: 40µA to 100mA
s Low temperature coefficient reference: +12mV
max deviation over temperature
s Accurate 1.24V reference voltage: +0.5%
(+6mV) at 25°C
s Low dynamic impedance: 0.3Ω at 1kHz
s Compact 3-lead SOT23 package option
s Industrial temperature range: -40°C to 85°C
s Adjustable output voltage: V to 6V
REF
APPLICATIONS
s SMPS control loop
s Shunt regulator
s Low temperature coefficient voltage reference
s Current limiting
s Over/Under voltage monitor
s 3V Off-line switching regulators
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
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.
CATHODE
REF
+
–
1.24 VREF
CATHODE
REF
ANODE
ANODE
© 2003 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 4006, Rev. J