CAT431L

Features:

Low startup overshoot
Wide current operation: 40µA to 100mA
Low temperature coefficient reference: +12mV max deviation over temperature
Accurate 1.24V reference voltage: +0.5% (+6mV) at 25
Low dynamic impedance: 0.3Ω at 1kHz
Compact 3-lead SOT23 package option
Industrial temperature range: -40 to 85
Adjustable output voltage: V_REF to 6V

Application

SMPS control loop
Shunt regulator
Low temperature coefficient voltage reference
Current limiting
Over/Under voltage monitor
3V Off-line switching regulators


Pinout




Specifications

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 ........ -65°C to +150°C


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.

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.