CAT431L

CAT431L Low-Voltage Adjustable Precision Voltage Reference - 0.5% Tolerance FEATURES s Low startup overshoot s Wide current operation: 40µA to 100mA s Low temperature coefficient reference: +12mV 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: VREF to 6V - SOT23 and TO92 Packages - Low Startup Overshoot max deviation over temperature s Accurate 1.24V reference voltage: +0.5% (+6mV) at 25°C 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. 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. FUNCTIONAL DIAGRAM CATHODE CATHODE REF + – REF 1.24 VREF ANODE ANODE © 2003 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. N...