Features Low start-up overshoot Current operating width: 40 to 100mA
Low Temperature Coefficient Reference: 12mV Max Deviation Over Temperature Accurate 1.24V Reference Voltage: +0.5%
(six mV) 25°C
Low dynamic impedance: 0.3 at 1kHz but compact 3-pin SOT23 package option Industrial temperature range: -40°C to 85°C
Adjustable Output Voltage: VREF to 6V...

Application Switching Power Supply Control Loop Shunt Regulator Low Temperature Coefficient Voltage Reference Current Limit Over/Under Voltage Monitor
3V Offline Switching Regulator

DESCRIPTION The CAT431L is a low voltage three-terminal adjustable shunt voltage reference with guaranteed thermal stability over the entire industrial temperature range. The CAT431L has a lower 1.24V reference and a wider current range than the currently widely used OS TL431 and TL431A shunt regulator references. Compared to TLV431/A, CAT431L1.24V reference time is more accurate. The wide AC bandwidth with minimum start-up and overshoot makes the CAT431L easily suitable for a wide range of one application. When used with an optocoupler and the CAT431L is an ideal isolated voltage reference for a 3V to 3.3V switching power supply feedback circuit supply.

Electrical Characteristics Electrical characteristics are guaranteed over the entire operating temperature from -40°C to +85°C, junction C from -40°C to +105°C unless otherwise specified. Ambient temperature must be derated based on power dissipation and thermal characteristics of the package.