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A Product Line of Diodes Incorporated
ZTL431/ZTL432
COST EFFECTIVE ADJUSTABLE PRECISION SHUNT REGULATOR
Description
The ZTL431 and ZTL432 are three terminal adjustable shunt regulators offering excellent temperature stability and output current handling capability up to 100mA. The output voltage may be set to any chosen voltage between 2.5 and 20 volts by selection of two external divider resistors. The devices can be used as a replacement for zener diodes in many applications requiring an improvement in zener performance. The ZTL432 has the same electrical specifications as the ZTL431 but has a different pin out in SOT23 (F-suffix) and SOT23F (FF-suffix). Both variants are available in 2 grades with initial tolerances of 1% and 0.5% for the A and B grades respectively. These are functionally equivalent to the TL431/ TL432 except for maximum operation voltage, and have an ambient temperature range of -40 to 125C as standard.
Pin Assignments
ZTL431_F SOT23, ZTL431_FF SOT23F (Top View)
Cathode 3
1 Anode
Ref
2
ZTL432_F SOT23, ZTL432_FF SOT23F (Top View)
Ref 3
1 Anode
Cathode 2
ZTL431_H6, SC70-6 (Top View)
Cathode 1 N/C
6 Anode 5 N/C 4 NC
Features
* * Temperature range ................ -40 to 125C Reference voltage tolerance at 25C o 0.5%.......................................B grade o 1% .........................................A grade 0.2 typical output impedance Sink current capability........ 1mA to 100mA Adjustable output voltage......VREF to 20V
2
Ref 3
Connected internally to substrate; should be left floating or connected to Anode
* * *
ZTL431ASE5 SOT235 (Top View)
Cathode
1
5 N/C
Anode 2
Applications
* * * * Opto-coupler linearization Linear regulators Improved zener Variable reference
Ref 3
4 N/C
ZTL431_E5 SOT235 (Top View)
N/C
1
5 Anode
N/C* 2 Cathode 3
4 Ref
*must be left floating or
connected to pin 5
ZTL431/ZTL432
Document number: DS33263 Rev. 15 - 2
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ZTL431/ZTL432 Absolute Maximum Ratings (Voltages specified are relative to the ANODE pin unless otherwise stated)
Parameter Cathode Voltage (VKA) Continuous Cathode Current (IKA) Reference Input Current Range (IREF) Operating Junction Temperature Storage Temperature Rating 20 150 -50A to 10mA -40 to 150 -55 to 150 Unit V mA C C
Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability.
Package Thermal Data
Package SOT23 SOT23F SOT23-5 SOT70-6 JA 380C/W 138C/W 250C/W 380C/W PDIS TA = 25C, TJ = 150C 330 mW 900 mW 500 mW 330mW
Recommended Operating Conditions
VKA Cathode Voltage IKA Cathode Current TA Operating Ambient Temperature Range Min VREF 1 -40 Max 20 100 125 Units V mA C
Electrical Characteristics
Symbol VREF Parameter Reference voltage Deviation of reference voltage over full temperature range Ratio of change in reference voltage to the change in cathode voltage Reference input current
(Test conditions unless otherwise specified: TA = 25C)
Conditions VKA = VREF IKA = 10mA VKA = VREF IKA = 10 mA ZTL43_A ZTL43_B TA = 0 to 70 TA = -40 to 85C TA = -40 to 125C VKA = VREF to 10 IKA = 10mA IKA = 10mA, R1 = 10k R2 = OC IKA = 10mA R1 = 10k R2 = OC VKA = VREF VKA = 20V, VREF = 0V VKA = VREF, f = 0Hz TA = 0 to 70C TA = -40 to 85C TA = -40 to 125C VKA = 10V to 20V
Min. 2.475 2.487
Typ. 2.5 2.5 6 14 14 -1.4 -1.0 2 0.8 0.8 0.8 0.4 0.1 0.2
Max. 2.525 2.513 16 34 34 -2.7 -2.0 4 1.2 2.5 2.5 0.6 0.5 0.5
Units V
VDEV
mV
VREF VKA IREF
mV/V
A
IREF IKA(MIN) IKA(OFF) RZ
IREF deviation over full temperature range Minimum cathode current for regulation Off state current Dynamic output impedance
A mA A
ZTL431/ZTL432
Document number: DS33263 Rev. 15 - 2
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ZTL431/ZTL432 Typical Characteristics
IKA = 10mA
Reference Voltage vs. Temperature
VREF = VKA
Dynamic Impedance vs. Frequency
1000
Power Dissipation (mW)
900 800 700 600 500 400 300 200 100 0 0
SOT23F
SOT23-5
SOT23 SC70-6
25
50
75
100
125
Ambient Temperature (C) Power Dissipation Derating
ZTL431/ZTL432
Document number: DS33263 Rev. 15 - 2
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ZTL431/ZTL432 Typical Characteristics (Cont.)
VKA
60 50 40 30 20 10 0 100
IKA
Gain (dB)
1000
10000
100000
1000000
Frequency (Hz)
IKA
Gain vs. Frequency
Test Circuit for Open Loop Voltage Gain
VKA
VKA
Pulse Response
Test Circuit for Pulse Response
VKA
100 90
Cathode Current (mA)
80 70 60 50 40 30 20 10 0 10.0E-12 100.0E-12 1.0E-9 10.0E-9 100.0E-9 1.0E-6
IKA
Stable ab e Stable
Load Capacitance (F)
Stability Boundary Condition
ZTL431/ZTL432
Document number: DS33263 Rev. 15 - 2
VREF < VKA < 20, IKA = 10mA, TA = 25C Test Circuit for Stabilty Boundary Conditions
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ZTL431/ZTL432 Application Circuits
V+ R1 VREF VREF VOUT V+ R1 VOUT
R2
R2
VOUT
VREF
VOUT
VREF
Shunt regulator
Higher current shunt regulator
V+ ZSR*** V+ In Out Common R1 0.01F VREF R1 R2 VOUT(MIN) = VREF + VREG VOUT VREF VOUT VREF VOUT VREF R2 VOUT 30
Output control of a three terminal fixed regulator
Series regulator
V+ V+ R1 R1 Output Input VTH = 2.5V VON~ 2V VOFF = V+ R2a R2b VREF VREF Output
VREF VREF
Single supply comparator with temperature compensated threshold
ZTL431/ZTL432
Document number: DS33263 Rev. 15 - 2
Over voltage / under voltage protection circuit
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ZTL431/ZTL432 DC Test Circuits
Notes Deviation of reference input voltage, Vdev, is defined as the maximum variation of the reference input voltage over the full temperature range. The average temperature coefficient of the reference input voltage, Vref is defined as:
VREF(ppm/C) = VDEV x 1,000,000 VREF(T1-T2) The dynamic output impedance, Rz, is defined as:
RZ = VZ IZ When the device is programmed with two external resistors, R1 and R2, (fig 2), the dynamic output impedance of the overall circuit, R'z, is defined as: R'Z = RZ
(1 + R1 )
R2
Stability Boundary The ZTL431 and ZTL432 are stable with a range of capacitive loads. A zone of instability exists as demonstrated in the typical characteristic graph on page 4. The graph shows typical conditions. To ensure reliable stability a capacitor of 4.7nF or greater is recommended between anode and cathode.
ZTL431/ZTL432
Document number: DS33263 Rev. 15 - 2
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ZTL431/ZTL432 Ordering Information
Tol. Ordering Code ZTL431AE5TA ZTL431AFFTA ZTL431AFTA ZTL431AH6TA ZTL431ASE5TA ZTL432AFFTA ZTL432AFTA ZTL431BE5TA ZTL431BFFTA ZTL431BFTA ZTL431BH6TA ZTL432BFFTA ZTL432BFTA Pack SOT23-5 SOT23F SOT23 SC70-6 SOT23-5 SOT23F SOT23 SOT23-5 SOT23F SOT23 SC70-6 SOT23F SOT23 Part Mark 31A 31A 31A 31A S2A 32A 32A 31B 31B 31B 31B 32B 32B Status* Active Active Active Active Active Active Active Active Active Active Active Active Active Reel Size 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm Tape Width (mm) 8 8 8 8 8 8 8 8 8 8 8 8 8 Quantity per Reel 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000
1%
0.5%
Package Outline Dimensions
SOT23
E
Dim.
e b 3 leads e1
Millimeters Min. Max. 0.01 0.30 1.12 0.10 0.50
Inches Min. Max.
Dim.
Millimeters
Inches
Min. Max. Max. Max. 1.90 NOM 0.075 NOM 2.10 1.20 2.64 0.083 0.104 1.40 0.047 0.055
A A1 b C
D
0.044 e1 E
0.0004 0.004
0.012 0.020 E1 0.003 0.008 L
0.085 0.120 2.80 3.04
0.25 0.62 0.018 0.024 0.45 0.62 0.018 0.024 -
L1
E1
D e
0.110 0.120 L1 -
0.95 NOM 0.0375 NOM
A A1 L c
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
SC70-6
Millimeters Inches Max. Millimeters Inches
Dim. A A1
Min. Max. Min. 0.80 0.80 0.15 0.08
Dim. E
Min. Max. Max. Max. 2.10 BSC 0.0826 BSC
1.10 0.0315 0.0433 0.10 -
0.0039 E1 e
1.25 1.35 0.0492 0.0531 0.65 BSC 1.30 BSC 0.0255 BSC 0.0511 BSC
a
A2 b C D
1.00 0.0315 0.0394
0.30 0.006 0.0118 e1 0.25 0.0031 0.0098 0.0787 BSC L a
0.26 0.46 0.0102 0.0181 0 8 0 8
2.00 BSC
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
ZTL431/ZTL432
Document number: DS33263 Rev. 15 - 2
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ZTL431/ZTL432 Package Outline Dimensions (continued)
SOT23F
D b b L1 L c e1 e
Dim. A A1
Millimeters
Inches Max.
Min. Max. Min.
Dim. E
Millimeters Min. Max. 2.30 1.50 1.10 0.48 0.39 0.05 0 -
Inches Max. Max.
0.80 1.00 0.031 0.0394 0.10
2.50 0.0906 0.0984 1.70 0.0590 0.0669 1.26 0.0433 0.0496 0.68 0.0189 0.0268 0.41 0.0153 0.0161 0.15 0.0019 0.0059 12 0 12 -
0.00 0.0043 E1
E1
E
A2 b c
0.06 0.16 0.0024 0.0006 E2 0.39 0.41 0.0153 0.0161 0.11 0.20 0.0043 0.0079 2.80 3.00 0.1102 0.1181 0.95 ref 1.90 ref 0.0374 ref 0.7480 ref L L1 R O -
R
b
A1
D e e1
A
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
TO92
Dim. A b C E e e1 L R S1 W D * Millimeters Min. 4.32 0.36 2.50 3.30 4.88 2.44 12.70 2.16 1.14 0.41 4.45 4 Max. 4.95 0.51 3.50 3.94 5.88 2.94 15.49 2.41 1.52 0.56 4.95 6 Min. 0.170 0.014 0.099 0.130 0.192 0.096 0.500 0.085 0.045 0.016 0.175 4 Inches Max. 0.195 0.020 0.138 0.155 0.232 0.116 0.610 0.095 0.060 0.022 0.195 6
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
SOT23-5
Dim. A A1 A2 b C D E E1 e e1 L a Millimeters Min. 0.90 0.00 0.90 0.20 0.09 2.70 2.20 1.30 Max. 1.45 0.15 1.30 0.50 0.26 3.10 3.20 1.80 Min. 0.0354 0.00 0.0354 0.0078 0.0035 0.1062 0.0866 0.0511 Inches Max. 0.0570 0.0059 0.0511 0.0196 0.0102 0.1220 0.1181 0.0708
0.95 REF 1.90 REF 0.10 0 0.60 30
0.0374 REF 0.0748 REF 0.0039 0 0.0236 30
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
ZTL431/ZTL432
Document number: DS33263 Rev. 15 - 2
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ZTL431/ZTL432
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ZTL431/ZTL432
Document number: DS33263 Rev. 15 - 2
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