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| Adjustable Shunt Regulator POWER MANAGEMENT Description The SC431 is a three terminal adjustable shunt regulator with thermal stability guaranteed over temperature. The output voltage can be adjusted to any value from 2.5V (V REF ) to 30V with two external resistors. The SC431 has a typical dynamic output impedance of 0.25. Active output circuitry provides a very sharp turn on characteristic, making the SC431 an excellent replacement for zener diodes. The SC431 shunt regulator is available with four voltage tolerances (0.5%, 1.0% and 2.0% over TA = -40C to +85C and 0.5% over TA = -40C to +125C) and two package options (SOT-23-3 and SO-8). This allows the designer the opportunity to select the optimum combination of cost and performance for their application. SC431 Features Wide operating current range 130A to 150mA Low dynamic output impedance 0.25 typ. Trimmed bandgap design + 0.5% Alternate for TL1431, TL431, LM431 & AS431 Industrial temperature range Available in SOT-23-3 and SO-8 packages Applications Linear Regulators Adjustable Supplies Switching Power Supplies Battery Operated Computers Instrumentation Computer Disk Drives Notes: 1) Set VOUT according to the following equation: R1 VOUT = VREF 1 + + IREF R1 R2 Typical Application Circuit(1)(2) 2) Choose the value for R as follows: * The maximum limit for R should be such that the cathode current, I Z , is greater than the minimum operating current (130A) at VIN(MIN). * The minimum limit for R should be such that IZ does not exceed 150mA under all load conditions, and the instantaneous turn-on value for I Z does not exceed 200mA. Both of the following conditions must be met: Rmin VIN(max) 200mA (to limit instantaneous turn-on IZ) R min IOUT (min) + 150mA (to limit IZ under normal VIN(max) - VOUT operating conditions) Revision: January 13, 2005 1 www.semtech.com SC431 POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Parameter Cathode Voltage Continous Cathode Current Reference Input Current Power Dissipation at TA = 25C SOT-23-3 SO-8 Thermal Resistance SOT-23-3 SO-8 Operating Ambient Temperature Range SC431Cx-.5, SC431Cx-1, SC431Cx-2 SC431CxQ Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 seconds ESD Rating (Human Body Model) Symbol VZ IZ IREF PD Maximum 31 150 10 0.37 0.78 336 163 -40 to +85 -40 to +125 -40 to +150 -65 to +150 300 2 Units V mA mA W J A C/W TA TJ TSTG TLEAD V ESD C C C C kV Electrical Characteristics Unless specified:TA = 25C. Values in bold apply over full operating ambient temperature range. SC431Cx-.5, S C 431C xQ Parameter Reference Voltage VREF Temp Deviation Ratio of Change in VREF to Change in VZ Reference Input Current IREF Temperature Deviation Off-State Cathode Current Dynamic Output Impedance Minimum Operating Current 2005 Semtech Corp. SC431Cx-1 Min 2.470 Typ 2.495 8 -0.5 -1.0 0.5 0.4 0.04 0.25 Max 2.520 25 -2.7 -2.0 4 1.2 0.50 0.50 130 A A A A Units V mV mV/V Symbol VREF V D EV Condition VZ = VREF, IZ = 10mA(1) VZ = VREF, IZ = 10mA(1) IZ = 10mA, VZ = 10V to VREF IZ = 10mA, VZ =30V to 10V R1 = 10k, R2 = , IZ = 10mA(2) R1 = 10k, R2 = , IZ =10mA(2) VREF = 0V, VZ =30V(3) f < 1kHz, VZ = VREF IZ = 130A to 100mA(1) VZ = VREF(1) 2 Min 2.482 Typ 2.495 8 -0.5 -1.0 0.5 0.4 0.04 0.25 Max 2.507 17 -2.7 -2.0 4 1.2 0.50 0.50 130 VREF VZ IREF IREF(DEV) IZ (OFF) rZ IZ (MIN) www.semtech.com SC431 POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified:TA = 25C. Values in bold apply over full operating ambient temperature range. SC431Cx-2 Parameter Reference Voltage VREF Temp Deviation Ratio of Change in VREF to Change in VZ Reference Input Current IREF Temperature Deviation Off-State Cathode Current Dynamic Output Impedance Minimum Operating Current Symbol VREF V D EV Condition VZ = VREF, IZ = 10mA(1) VZ = VREF, IZ = 10mA(1) IZ = 10mA, VZ = 10V to VREF IZ = 10mA, VZ =30V to 10V R1 = 10k, R2 = , IZ = 10mA(2) R1 = 10k, R2 = , IZ =10mA(2) VREF = 0V, VZ =30V(3) f < 1kHz, VZ = VREF, IZ = 130A to 100mA(1) VZ = VREF(1) Min 2.445 Typ 2.495 15 -0.5 -1.0 0.5 0.4 0.04 0.25 Max 2.545 30 -2.7 -2.0 4 1.2 0.50 0.50 130 A A A A Units V mV mV/V VREF VZ IREF IREF(DEV) IZ (OFF) rZ IZ (MIN) Notes: (1) See Test Circuit 1 below. (2) See Test Circuit 2 below. (3) See Test Circuit 3 below. Test Circuits Test Circuit 1 VZ = VREF Test Circuit 2 VZ > VREF Test Circuit 3 Off-State Recommended Operating Conditions Min Cathode Voltage, VZ Cathode Current, IZ VREF 0.130 Max 30 150 Symbol V mA 2005 Semtech Corp. 3 www.semtech.com SC431 POWER MANAGEMENT Pin Configurations SOT-23-3 (Top View) SO-8 (Top View) Block Diagram Symbol Ordering Information Tolerance Ambient Temperature Range SOT-23-3(1) SOT-23-3(1),(3) SO-8(2) 0.5% -40C to +85C SC431CSK-.5 TR SC431CSK-.5 TRT SC431CS-.5 TR 0.5% -40C to +125C SC431CSKQTR SC431CSKQTRT SC431CSQTR 1.0% -40C to +85C SC431CSK-1.TR SC431CSK-1.TRT SC431CS-1.TR 2.0% -40C to +85C SC431CSK-2.TR SC431CSK-2.TRT SC431CS-2.TR Notes: (1) Only available in tape and reel packaging. A reel contains 3000 devices. (2) Only available in tape and reel packaging. A reel contains 2500 devices. (3) "T" at end of part number indicates "lead free". This product is fully WEEE and RoHS compliant. 2005 Semtech Corp. 4 www.semtech.com SC431 POWER MANAGEMENT Marking Information SOT-23-3 (Top View) SO-8 (Top View) 431 431 SC 431CS yyww SO-8 (Bottom View) xxxxx yyww = Datecode (Example: 0008) xxxxx = Semtech Lot # (Example: 00101) 2005 Semtech Corp. 5 www.semtech.com SC431 POWER MANAGEMENT Typical Characteristics Cathode Current vs. Cathode Voltage 300 200 100 0 -100 -200 -300 -2 -1 0 VZ (V) 1 2 3 IZ (mA) IZ ( A) 150 100 50 0 -50 -100 -150 -2 -1 0 VZ (V) 1 2 3 VZ = VREF TA = 25 C o Cathode Current vs. Cathode Voltage VZ = VREF TA = 25 C o Reference Voltage vs. Junction Temperature 2.515 2.510 2.505 2.500 2.495 2.490 2.485 -50 -25 0 25 50 TJ (C) 75 100 125 150 20 IREF (nA) VREF (V) 60 VZ = VREF IZ = 10mA 100 Reference Input Current vs. Junction Temperature IZ = 10mA R1 = 10k R2 = 80 40 0 -50 -25 0 25 50 TJ (C) 75 100 125 150 Ratio of Delta Reference Voltage to Delta Cathode Voltage vs. Junction Temperature 0.5 IZ = 10mA VZ = 3V to 30V 100 Off-State Cathode Current vs. Junction Temperature VZ = 30V VREF = 0V 0.4 VREF/ VZ (-mV/V) 10 0.3 IZ(off) 1 0.2 0.1 0.1 0.01 0 -50 -25 0 25 50 TJ (C) 75 100 125 150 0.001 -50 -25 0 25 50 TJ (C) 75 100 125 150 2005 Semtech Corp. 6 www.semtech.com SC431 POWER MANAGEMENT Typical Characteristics (Cont.) Small-Signal Gain and Phase Shift vs. Frequency 80 70 60 50 AV (dB) 40 30 20 10 0 -10 -20 1.0E+02 1.0E+03 1.0E+04 f (Hz) 1.0E+05 IZ = 10mA TA = 25C -180 -225 -270 Phase Shift (deg) -315 -360 -405 -450 -495 -540 -585 -630 1.0E+06 Test Circuit - Small-Signal Gain and Phase Reference Impedance vs. Frequency 100 IZ = 10mA TA = 25C 10 rZ ( ) 1 0.1 0.01 1.0E+03 1.0E+04 1.0E+05 f (Hz) 1.0E+06 1.0E+07 Stability Boundary Condition For Shunt Regulation vs. Cathode Current and Load Capacitance Test Circuit - Stability 2005 Semtech Corp. 7 www.semtech.com SC431 POWER MANAGEMENT Outline Drawing - SOT-23-3 D e1 3 B A DIM A A1 A2 b c D E E1 e e1 L L1 N 0 aaa bbb DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .035 .000 .035 .012 .003 .110 .082 .047 .015 .037 .114 .093 .051 .075 .037 .020 .022 3 .004 .008 .044 .004 .040 .020 .007 .120 .104 .055 .024 1.12 0.89 0.01 0.10 0.88 0.95 1.02 0.30 0.51 0.08 0.18 2.80 2.90 3.04 2.10 2.37 2.64 1.20 1.30 1.40 1.90 BSC 0.95 BSC 0.40 0.50 0.60 (0.55) 3 0 8 0.10 0.20 E1 E 1 2 bxN e bbb CAB 0 8 A A2 3X aaa C SEATING PLANE A1 C H SEATING PLANE C GAUGE PLANE 0.25 L L1 DETAIL A 0 c SIDE VIEW NOTES: SEE DETAIL A 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. Land Pattern - SOT-23-3 X Y DIM Z G C C E E1 G X Y Z DIMENSIONS INCHES MILLIMETERS (.087) .037 .075 .031 .039 .055 .141 (2.20) 0.95 1.90 0.80 1.00 1.40 3.60 Y E E1 NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A. 2005 Semtech Corp. 8 www.semtech.com SC431 POWER MANAGEMENT Outline Drawing - SO-8 A N 2X E/2 E1 E 1 ccc C 2X N/2 TIPS 2 e/2 B D aaa C SEATING PLANE A2 A C bxN bbb A1 C A-B D GAGE PLANE 0.25 SEE DETAIL SIDE VIEW NOTES: 1. 2. 3. 4. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -HDIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. REFERENCE JEDEC STD MS-012, VARIATION AA. e D DIM A A1 A2 b c D E1 E e h L L1 N 01 aaa bbb ccc DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .053 .069 .004 .010 .049 .065 .012 .020 .007 .010 .189 .193 .197 .150 .154 .157 .236 BSC .050 BSC .010 .020 .016 .028 .041 (.041) 8 0 8 .004 .010 .008 1.35 1.75 0.10 0.25 1.25 1.65 0.31 0.51 0.17 0.25 4.80 4.90 5.00 3.80 3.90 4.00 6.00 BSC 1.27 BSC 0.25 0.50 0.40 0.72 1.04 (1.04) 8 0 8 0.10 0.25 0.20 h h H c A L (L1) DETAIL 01 A Land Pattern - SO-8 X DIM (C) G Z C G P X Y Z DIMENSIONS INCHES MILLIMETERS (.205) .118 .050 .024 .087 .291 (5.20) 3.00 1.27 0.60 2.20 7.40 Y P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A, RLP NO. 300A. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 2005 Semtech Corp. 9 www.semtech.com |
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