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Adjustable Precision Shunt Regulator
Description
The CYT432 is a low voltage three terminal adjustable shunt regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage can be set to any value between VREF (approximately 1.24 V) to 12V with two external resistors. This device has a typical output impedance of 0.25. Active output circuitry provides a very sharp turn on characteristic, making this device excellent replacement for Zener diodes in many applications. The CYT432 is characterized for operation from 0oC to 105oC, and four package options (SOT-23-3,
CYT432
Features
Low voltage operation (1.24V) Adjustable output voltage V0 =VREF to 12V Wide operating current range 60A to 100mA Low dynamic output impedance 0.25 (Typ.) Trimmed bandgap design up to + 0.5%. ESD rating is 4KV(Per MIL-STD-883D) Available in Lead-Free Packages.
Application
Linear Regulators Adjustable Supplies Switching Power Supplies Battery Operated Computers Instrumentation Computer Disk Drives
SOT-23-5, TO-92 and SOP-8) allow the designer the opportunity to select the proper package for their applications.
Pin Configuration
SOT-23-3, SC59-3L (Top View) SOT-23-5L (Top View) SOP-8 (Top View) TO-92 (Top View)
Marking Information
Package SOT-23-3 SC59-3L Marking CYT432W Production Year Code
Starting with S, a bar on top of S is for production year 2001, and underlined S is for year 2002. The next character is marked on top for 2003, and
Production Week Code
Lead-Free Package Lead-free package is indicated by a dot on top of the week code.
A-Z: 1-26 a-z: 27-52
SOT-23-5L
CYT432W CYT432 YYWW CYT432 YYWW
underlined for 2004. The naming pattern continues with consecutive characters for later years.
SOP-8
WW is for the week of YY is for the year of production. 04 means the product is manufactured in year of 2004. production. 26 means the
Lead-free
package
is
TO-92
product is manufactured in the 26th week
indicated by LF after YYWW.
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Adjustable Precision Shunt Regulator
Absolute Maximum Rating
Parameter Cathode Voltage Continuous Cathode Current Reference Current Operating Junction Temperature Range Storage Temperature Range Symbol VKA I KA I REF TJ TSTG Maximum 12 150 3 150 -45 to 150 230 (SOT-23-3) Thermal Resistance JA 230 (SOT-23-5) 150 (SOP-8) 220 (TO-92) Lead Temperature (Soldering) 10 seconds TLEAD 260
CYT432
Units V mA mA C C
C/W
C
Electrical Characteristics
Parameter 1.250V 0.5% Reference Voltage 1.240V 0.5% 1.240V 1.0% 1.240V 1.5% 1.240V 2.0% Deviation of Reference Voltage over Full Temperature Range Ratio of Change in Reference Voltage to the Change in Cathode Voltage Reference Current Test circuit #1 VI(DEV) VKA = VREF, IKA = 10mA, TA = 0C - 105C VREF/VKA Test circuit #2 IKA = 10mA, VKA = 12V to VREF Test circuit #2 IKA = 10mA, R1=10k, R2 = Test circuit #2 II(DEV) IKA = 10mA, R1=10k, R2 = TA = 0C - 105C IMIN Test circuit #1 VKA = VREF Test circuit #3 VKA = 12V, VREF = 0 Test circuit #1 Dynamic Impedance | ZKA | IKA = 100A - 80mA, VKA = VREF, f 1kHZ -0.25 1 -60 100 A -0.10 0.50 A --1.0 -2.7 mV/V -10 25 mV VREF Test circuit #1 VKA = VREF, IKA = 10mA Symbol Test Conditions & Circuit Min 1246 1234 1228 1221 1215 Typ 1250 1240 1240 1240 1240 Max 1256 1246 1252 1259 1265 mV Unit
IREF
--
0.15
2
A
Deviation of Reference Current over Full Temperature Range Minimum Cathode Current for Regulation Off-state Cathode Current
IOFF
--
0.04
0.8
A
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Adjustable Precision Shunt Regulator
Typical Performance Characteristics
Cathode Current VS Cathode Voltage
150 125 Cathode Current (mA) 100 75 50 25 0 -25 -50 -75 -100 -2 -1 0 1 2 Cathode Voltage (V) VKA = Vref TA = 25C
CYT432
Cathode Current VS Cathode Voltage
500 400 Cathode Current (uA) 300 200 100 0 -100 -200 -1 0 1 2 Cathode Voltage (V) VKA = Vref TA = 25C
Reference Voltage VS Junction Temperature
1260
Reference Input Current VS Junction Temperature
1000 R1 = 10k R2 = I KA =10mA
Reference Current (nA)
120
Reference Voltage (mV)
1250 1240 1230 1220 1210 1200 -20 0 20 40 60
800
Iz=10mA
600
Iz=60A
400
200
80
100
Junction Temperature (C)
0 - 20
0
20
40
60
80
100
120
Junction Temperature (C)
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Adjustable Precision Shunt Regulator
Stability Boundary Condition
100
CYT432
80
IKA (mA)
60
40
20
0 0.001 0.01 0.1 1
CL (uF)
VKA=VREF (1.24V)
VKA=2V
VKA=3V
The areas under the curves represent conditions that may cause the device to oscillate. For VKA = 2V and 3V curves, R2 and VBAT were adjusted to establish the initial VKA and IK conditions with CL = 0. VBAT and CL then were adjusted to determine the ranges of stability. As the graph suggested, CYT432 is unconditional stable with IK from 0 to 100mA and with CL from 0.001uF to 1uF.
All contents are subject to change without prior notice. 4
Adjustable Precision Shunt Regulator
Symbol Diagram
Cathode
Ref
CYT432
Block Diagram
Cathode
+
Ref
Vref
Anode
Anode
Test Circuits
Input
V KA
Input
VKA
Input
VKA
I KA
I KA
I off
R1 Iref
Vref
R2
Vref
R1 VKA = Vref (1+ ) + Iref x R1 R2
Test Circuit 1: VKA = VREF
Test Circuit 2: VKA > VREF
Test Circuit 3: Off State Current
Application Circuit
VIN
R
VOUT
R1 Vref R2 CYT432
VOUT = Vref (1+R1 )
R2
GND
All contents are subject to change without prior notice. 5
Adjustable Precision Shunt Regulator
OUTLINE DRAWING SOT-23-3
C J B H
CYT432
DIM
D A E
N
DIMENSIONS INCHES MM MIN MAX MIN MAX
0.110 0.047 0.083 0.035 0.070 0.018 0.015 0.0005 0.034 0.003 0.120 0.055 0.104 0.040 0.080 0.024 0.020 0.004 0.040 0.007 0.027 2.80 1.20 2.10 0.89 1.78 0.45 0.37 0.013 0.887 0.085 3.04 1.40 2.64 1.03 2.05 0.60 0.51 0.10 1.02 0.18 0.69
F
G
K
L
A B C D E F G H J K L
OUTLINE DRAWING SC59-3L
DIMENSIONS INCHE MM MIN MAX MIN MAX 0.035 0.043 0.90 1.10 0.0004 0.005 0.01 0.13 0.012 0.020 0.30 0.50 0.004 0.008 0.09 0.20 0.110 0.122 2.80 3.10 0.098 0.122 2.50 3.10 0.059 0.067 1.50 1.70
0.037REF 0.075REF 0.008 0.014 0 0.022 0.031 10 0.95REF 1.90REF 0.20 0.35 0 0.55 0.80 10
H
A
DIM
A1
N
E
B
e1
D
L
Q
SC 59-3L
L1 C
A A1 B C D H E e e1 L1 L Q
OUTLINE DRAWING SOT-23-5L
K B H D
DIM A B C D E F H J K
N
DIMENSIONS INCHES MM MIN MAX MIN MAX
0.110 0.059 0.036 0.014 0.0035 0.102 0.120 0.070 0.051 0.020 0.037 0.075 0.006 0.008 0.118 2.80 1.50 0.90 0.35 0.090 2.60 3.05 1.75 1.30 0.50 0.95 1.90 0.15 0.20 3.00
A
F E
C
J
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Adjustable Precision Shunt Regulator
OUTLINE DRAWING SOP-8
1 2
D
CYT432
8 7 6
B1
B
DIM A A1 B B1 C D H E
N
3 4
DIMENSIONS INCHES MM MIN MAX MIN MAX
0.0532 0.0688 0.0040 0.0098 0.0130 0.0200 0.050 BSC 0.0075 0.0098 0.1890 0.1968 0.2284 0.2440 0.1497 0.1574 1.35 1.75 0.10 0.25 0.33 0.51 1.27 BSC 0.19 0.25 4.80 5.00 5.80 6.20 3.80 4.00
5
A1 E H A
C
OUTLINE DRAWING TO-92
A
B D
DIM A B E F G H J K
N
DIMENSIONS INCHES MM MIN MAX MIN MAX
0.175 0.170 0.500 0.016 0.045 0.095 0.080 0.125 0.205 0.210 0.610 0.021 0.055 0.105 0.105 0.165 4.445 4.318 12.70 0.407 1.143 2.413 2.032 3.175 5.207 5.334 15.50 0.533 1.397 2.667 2.667 4.191
E
G F H K
J
All contents are subject to change without prior notice. 7

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