CAT431L Datasheet | Catalyst Semiconductor

Low-Voltage Adjustable Precision Voltage Reference - 0.5% Tolerance Features s Low startup overshoot s Wide current operation: 40µA to 100m A s Low temperature coefficient reference: +12m V s Low dynamic impedance: 0.3Ω at 1k Hz s pact 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% (+6m V) 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. pared 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 Doc. No. 4006, Rev. J PIN CONFIGURATION SOT-23 TOP VIEW 2 CATH ANODE 3 1 REF NC 1 NC 2 CATH 3 4 REF SOT-23-5 TOP VIEW 5 ANODE TO-92 TOP VIEW CATH ANODE REF PIN DESCRIPTIONS Pin Name CATH REF ANODE Function Output and supply terminal, must be greater than 1.24V for normal operation Input, nominally 1.24V in normal operation Ground and Substrate ORDERING INFORMATION Part Number CAT431LEUR-TE7 CAT431LEUK-TE7 CAT431LEZR-TEAP TE7 = 7" Reel, 3,000 parts per reel TEAP = Ammopack, 3,000 parts...