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WT431LT1
PROGRAMMABLE PRECISION REFERENCE
P b Lead(Pb)-Free
Features: * Programmagle output voltage to 36V. * Low dynamic output impedance 0.2. * Sink current capability of 1 to 100mA. * Equivalent full-range temperature coefficient of 50ppm/C typical for operation over full rated operating temperature range.
1 2 3
SOT-23
Description: * The WT431 is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between Vref(approximately 2.5) and 36V with two external resistors. It provides very wide applications, including shunt regulator, series regulator, switching regulator, voltage reference and others.
SOT-23 Outline Dimensions
A
Unit:mm
TOP VIEW
B
C
E
G H
D
K
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J
L
M
Dim A B C D E G H J K L M
Min 0.35 1.19 2.10 0.85 0.46 1.70 2.70 0.01 0.89 0.30 0.076
Max 0.51 1.40 3.00 1.05 1.00 2.10 3.10 0.13 1.10 0.61 0.25
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WT431LT1
BLOCK DIAGRAM
CATHODE
REF
+ VREF
ANODE
PIN ASSIGNMENT
WT431R
3
WT431L
3
1
2
1
2
PIN1 = REF PIN2 = Cathode PIN3 = Anode
PIN1 = Cathode PIN2 = REF PIN3 = Anode
Ordering information
Ordering Number WT431RA WT431RB www..com WT431LA WT431LB Rank 0.5% 1% 0.5% 1% Shipping 3000 Units / Tape & Reel 3000 Units / Tape & Reel 3000 Units / Tape & Reel 3000 Units / Tape & Reel
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WT431LT1
ABSOLUTE MAXIMUM RATINGS(Operating temperature range applies unless otherwise specified)
PARAMETER Cathode Voltage Cathode Current Range(Continuous) Reference Input Current Range Operating Junction Temperature Operating Ambient Temperature Storage Temperature SYMBOL VKA VALUE 36 -100 ~ +150 -0.05 ~ +10 150 0~70 -65 ~ +150 UNIT V
IKA Iref Tj Topr Tstg
mA mA C C C
RECOMMENDED OPERATING CONDITIONS
PARAMETER Cathode Voltage Cathode Current SYMBOL VKA IKA Min VREF 1 Typ Max 36 100 UNIT V mA
ELECTRICAL CHARACTERISTICS(TA=25C unless otherwise specified)
PARAMETER Reference Input Voltage Deviation of reference Input Voltage Over temperature SYMBOL Vref Vref /T TEST CONDITIONS VKA=VREF, IKA=10mA VKA=VREF, IKA=10mA TMIN<=TA<=TMAX Min Typ 2.50 4.5 -1.0 -0.5 1.5 0.4 0.45 0.05 0.15 Max 17 -2.7 -2.0 4 1.2 1.0 1.0 0.5 UNIT V mV mV/V A A mA A
Ratio of Change in Reference Input VKA=10V~VREF Vref /VKA IKA=10mA Voltage to the change in Cathode Voltage VKA=36V~10V Reference Input Current Deviation of reference Input Current Over Full temperature range Minimum Cathode current for Regulation Off-State Cathode current Dynamic Impedance Iref Iref /T IKA(min) IKA(OFF) ZKA IKA=10mA, R1=10k IKA=10mA, R1=10k TA=full temperature VKA=VREF VKA=36V, VREF=0 VKA=VREF=0, IKA=1 to 100mA <=

CLASSIFICATION OF Vref AND & MARKING
PARAMETER WT431RA
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Rank 0.5% 1% 0.5% 1%
Range(V) 2.487~2.512 2.475~2.525 2.487~2.512 2.475~2.525
Marking RA RB LA LB
WT431LA WT431LB
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WT431LT1
TYPICAL PERFORMANCE CHARACTERISTICS
1 1 T
A
C
RE
T
A
C
RE
A
A
C
4
C
1 1 1 3
1 1 3
C
C
C
I
A
C
Fig 1 Cathode Current Vs Cathode Voltage
C
C
C
T
C
IN
I 1 1
T
A
1
C
A
4 3
I C
3 3 4
R
I
1
1
1
3
3
4
1
3
4
C
T
3C
C
R
I
4
R
1
T IA
1
1
C A
1
A
4 3
T IA1
C A
I
1 1
1
1
A
3 4
1 1 1 1 1
1
1
3
1
4
1
1
1
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D
I
A
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WT431LT1
WT431 LINEAR INTEGRATED CIRCUIT
TE T CIRCUIT
IN UT I
A A
IN UT I R1 IRE R
RE A
A
IN UT I
A
A
WT431
WT431
WT431
RE
A
RE
1 R1 R
IRE R1
7T
C
A
RE
8T
C
A
RE
9T
C
I
A
A
LICATI N CIRCUIT
IN UT R1 R1
WT7805
R1
C N
RE
RE
RE
R
WT431 WT431
R
R
WT431
1 R1 R
RE
1 R1 R
RE
1 R1 R
RE
1
R
11 T
C
R
T
1
R
I I
R RCL
R
WT431
WT431
I
RE
R
I
RE
RCL
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13 C 14 C L C
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