CAT431L Low-Voltage Adjustable Precision Voltage Reference - 0.5% Tolerance - SOT23 and TO92 Packages - Low Startup Overshoot FEATURES ■ Low startup overshoot ■ Low dynamic impedance: 0.3Ω at 1kHz ■ Wide current operation: 40µA to 100mA ■ Compact 3-lead SOT23 package option ■ Low temperature coefficient reference: +12mV ■ Industrial temperature range: -40°°C to 85°°C max deviation over temperature ■ Adjustable output voltage: VREF to 6V ■ Accurate 1.24V reference voltage: +0.5% (+6mV) at 25°°C APPLICATIONS ■ SMPS control loop ■ Current limiting ■ Shunt regulator ■ Over/Under voltage monitor ■ Low temperature coefficient voltage reference ■ 3V Off-line switching regulators DESCRIPTION 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. 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 CATHODE CATHODE + REF – REF 1.24 VREF ANODE ANODE © 2003 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. 4006, Rev. J CAT431L PIN CONFIGURATION SOT-23 TOP VIEW SOT-23-5 TOP VIEW 2 CATH NC 1 TO-92 TOP VIEW 5 ANODE CATH NC 2 ANODE 3 1 REF ANODE REF 4 REF CATH 3 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 Package Ambient Temperature Range CAT431LEUR-TE7 3-Pin, SOT-23 -40° C to 85° C CAT431LEUK-TE7 5-Pin, SOT-23 -40° C to 85° C CAT431LEZR-TEAP 3-Pin, TO-92 -40° C to 85° C TE7 = 7" Reel, 3,000 parts per reel TEAP = Ammopack, 3,000 parts per reel Doc. No. 4006, Rev. J 2 CAT431L ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolongued time periods may affect device reliability. All voltages are with respect to ground. 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 ELECTRICAL CHARACTERISTICS Electrical characteristics are guaranteed over the full operating temperature range of -40°C to +85°C with a junction temperature from -40°C to +105°C unless otherwise specified. Ambient temperature must be de-rated based upon power dissipation and package thermal characteristics.1 Symbol Parameter Conditions Reference Voltage VREF=VCATH ICATH=10mA VREF Typ Max Units 25° C 1.234 1.240 1.246 V TEMP 1.228 1.240 1.252 V 4 12 mV ∆VREF VREF Temperature deviation ∆VREF ∆VCATH Ratio of VREF Change to VCATH Change (Line Reg; 1/gain) ICATH=10mA VCATH=VREF to 6V 0.3 1 mV/V Reference input current ICATH=10mA 0.2 0.4 µA IREF ∆IREF IREF Temperature Deviation 0.04 0.2 µA ICATH(min) Minimum Cathode Current 18 40 µA ICATH(OFF) Off-State Cathode Current VREF=0V; VCATH=16V 100 nA Dynamic Output Impedance ICATH=0.1 to 100mA f=1.0kHz 0.4 Ω rCATH 1. Min 0.3 Thermal Characteristics (ΘJA) 3-lead, SOT-23: 336°C/W 5-lead, SOT-23: 255 3-pin, TO-92: 155 Recommended Operating Conditions Parameter Min Max Units Cathode Voltage VREF 6 V Cathode Current 0.1 15 mA Operating Ambient Temperature -40 85 °C 3 Doc. No. 4006, Rev. J CAT431L TYPICAL PERFORMANCE CHARACTERISTICS Reference Voltage vs. Junction Temperature Reference Input Current vs. Junction Temperature 250 Reference Input Current (nA) 1.246 Reference Voltage (V) 1.244 1.242 1.240 1.238 1.236 1.234 1.232 -50 -25 0 25 50 75 240 230 220 210 200 190 180 170 160 150 -50 100 125 150 Junction Temperature (°C) 0 25 50 75 100 125 150 Junction Temperature (°C) Cathode Current vs. Cathode Voltage Cathode Current vs. Cathode Voltage 150 Cathode Current (mA) -25 50 40 100 30 50 20 0 10 -50 0 -10 -1 -100 -1 -0.5 0 0.5 1 1.5 Cathode Voltage (V) Doc. No. 4006, Rev. J 0.5 1 Cathode Voltage (V) 4 1.5 CAT431L TYPICAL PERFORMANCE CHARACTERISTICS Delta Reference Voltage Per Delta Cathode Voltage vs. Junction Temperature 80 0 Delta Reference Voltage per Delta Cathode Voltage (mV/V) Off-State Cathode Current (nA) Off-State Cathode Current vs. Junction Temperature 70 60 50 40 30 20 10 0 -50 -25 0 25 50 75 -0.02 -0.04 -0.06 -0.08 -0.10 -0.12 -0.14 -0.16 -0.18 -50 100 125 150 -25 Junction Temperature (°C) Open Loop Voltage Gain vs. Frequency 50 75 100 125 150 100 Dynamic Impedance (kohms) 80 Open Loop Voltage Gain (dB) 25 Dynamic Impedance vs. Frequency 100 60 40 20 0 -20 0.001 0 Junction Temperature (°C) 10 1 0.1 0.01 0.1 1 10 100 1000 0.1 Frequency (kHz) 1 10 100 1000 10000 Frequency (kHz) 5 Doc. No. 4006, Rev. J CAT431L Doc. No. 4006, Rev. J 6 CAT431L TYPICAL APPLICATIONS Shunt Voltage Regulator Vo R1 0.1% ( ( R1 CAT431L Vo = 1 + R2 VREF VREF R2 0.1% Flyback Converter with Optical Isolation VI 120V ~ - + Vo 3.3V Gate Drive VCC Controller GND VFB Current Sense CAT431L 7 Doc. No. 4006, Rev. J CAT431L PACKAGE OUTLINES 3 LEAD SOT-23 E E1 b PIN #3 PIN #1 PIN #2 e e1 D (4X) ] 08 0. [R ) 3 0 LL .0 R0 (A c 0.01[0.54] A1 A2 A L1 L NOTES: 1. ALL DIMENSIONS ARE IN INCHES & IN [ ] ARE IN MM. 2. PACKAGE OUTLINE DIMENSIONS INCLUSIVE OF METAL BURRS. 3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.076MM. [0.003"]. 4. ALL PACKAGE SURFACES TO BE MIRROR FINISH. 5. MOLDING AND FORMING WITH DIE FACING UP. 6. LEADFINISH PLATING: 0.00762MM [0.0003"] - 0.0254MM [0.001"]. PACKAGE OUTLINE EXCLUSIVE OF LEADFINISH PLATING. 7. THIS POD COMPLIES TO JEDEC TO-236AB ISSUE H. Doc. No. 4006, Rev. J 8 CAT431L 5 LEAD SOT-23 1.900 0.950 PIN #4 2.800+0.200 1.650+0.050 -0.150 BOTTOM PACKAGE PIN #5 PIN #1 0.350+0.150 -0.000 2.900+0.100 R0. 070 - 0 .1 30 1.100+0.200 .0 .0 0.152+0.008 R0 30 .1 X) (4 -0 0.100+0.050 DATUM "A" 0.575 0.200 1.200+0.250 1.600 +0.050 -0.150 TOP PACKAGE 0 02 0. 7+ 19 0. R 0.418+0.250 PIN #3 0.400+0.150 -0.050 NOTES: 1. ALL DIMENSIONS ARE IN MM. 2. PACKAGE OUTLINE DIMENSIONS INCLUSIVE OF METAL BURR. 3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.076MM. 4. ALL PACKAGE SURFACE TO BE MIRROR FINISH. 5. MOLDING WITH DIE FACING UP, AND FORMING WITH DIE FACING DOWN. 6. FOOT LENGTH TO BE MEASURED AT THE INTERCEPT POINT OF EXTERNAL LEADS AND DATUM "A". 7. LEADFINISH PLATING: 0.00762MM - 0.0254MM. PACKAGE OUTLINE EXCLUSIVE OF LEADFINISH PLATING. 9 Doc. No. 4006, Rev. J CAT431L 3 LEAD TO92 1.33 - 1.60 13.95 +/- 1.25 4.6 +/- 0.2 Branding surface 0.53 max. (TRIM) 0.405 +/- 0.045 0.458 min 0.505 max 3.55 +/- 0.15 R = 0.1 max 0.38 (for lead tip only) Round lead corners (R = 0.2) NOTE : 1.0 All dimensions are in mm. 2.0 Dimension tolerance of 0.05 mm unless otherwise specified. 3.0 Solder dipping finish @ 63/37 Sn/Pb. 4.0 Burrs in trim @ 0.13 mm max. Doc. No. 4006, Rev. J 10 4.3 (PLANE AREA = 4.0) 2.54 4.6 +/- 0.1 1.27 2.04 - 2.66 CAT431L REVISION HISTORY Date Rev. Reason 12/15/03 J Updated typical performance characteristics legend for Delta Reference voltage Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: DPP ™ AE2 ™ Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. For a complete list of patents issued to Catalyst Semiconductor contact the Company’s corporate office at 408.542.1000. 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Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete. Catalyst Semiconductor, Inc. Corporate Headquarters 1250 Borregas Avenue Sunnyvale, CA 94089 Phone: 408.542.1000 Fax: 408.542.1200 www.catalyst-semiconductor.com Publication #: Revison: Issue date: Type: 11 4006 J 12/15/03 Final Doc. No. 4006, Rev. J