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 0.25Ω. 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 = -40°C to +85°C and 0.5% over TA = -40°C to +125°C) 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 130µA to 150mA Low dynamic output impedance 0.25 Ω typ. Trimmed bandgap design + 0.5% Alternate for TL1431, TL431, LM431 & AS431 Industrial temperature range Available in SOT-23-3 and SO-8 packages. Also available in Lead-free, fully WEEE and RoHS compliant.
Applications
Linear Regulators Adjustable Supplies Switching Power Supplies Battery Operated Computers Instrumentation Computer Disk Drives
Typical Application Circuit(1)(2)
Notes: 1) Set VOUT according to the following equation:
R1 VOUT = VREF 1 + + IREF R1 R2
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 (130µA) 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 d oes 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: April 23, 2008
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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 = 25°C 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
θJ A
°C/W
TA TJ TSTG TLEAD V ESD
°C °C °C °C kV
Electrical Characteristics
Unless specified:TA = 25°C. 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
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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 µA µA µA Ω µA 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 = 10kΩ, R2 = ∞, IZ = 10mA(2) R1 = 10kΩ, R2 = ∞, IZ =10mA(2) VREF = 0V, VZ =30V(3) f < 1kHz, VZ = VREF IZ = 130µA 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)
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SC431
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless specified:TA = 25°C. 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 = 10kΩ, R2 = ∞, IZ = 10mA(2) R1 = 10kΩ, R2 = ∞, IZ =10mA(2) VREF = 0V, VZ =30V(3) f < 1kHz, VZ = VREF, IZ = 130µA 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 µA µA µA Ω µA 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
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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) SO-8(2)(3) 0.5% -40°C to +85°C SC431CSK-.5 TR SC431CSK-.5TRT SC431CS-.5 TR SC431CS-.5 TRT 0.5% -40°C to +125°C SC431CSKQTR SC431CSKQTRT SC431CSQTR SC431CSQTRT 1.0% -40°C to +85°C SC431CSK-1.TR SC431CSK-1TRT SC431CS-1.TR SC431CS-1.TRT 2.0% -40°C to +85°C SC431CSK-2.TR SC431CSK-2TRT SC431CS-2.TR SC431CS-2.TRT
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.
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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)
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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 = 10kΩ 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
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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 = 25°C -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 = 25°C
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
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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.
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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
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