WEITRON WT431LT1

WT431LT1
PROGRAMMABLE PRECISION REFERENCE
P b Lead(Pb)-Free
3
1
Features:
* Programmagle output voltage to 36V.
* Low dynamic output impedance 0.2Ω.
* Sink current capability of 1 to 100mA.
* Equivalent full-range temperature coefficient of 50ppm/°C
typical for operation over full rated operating temperature range.
2
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
Unit:mm
A
B
TOP VIEW
E
G
C
D
H
K
J
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L
M
1/5
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
03-Nov-06
WT431LT1
BLOCK DIAGRAM
CATHODE
REF
+
VREF
ANODE
PIN ASSIGNMENT
WT431R
WT431L
3
1
3
2
1
PIN1 = REF
PIN2 = Cathode
PIN3 = Anode
2
PIN1 = Cathode
PIN2 = REF
PIN3 = Anode
Ordering information
Ordering Number
Rank
Shipping
WT431RA
0.5%
3000 Units / Tape & Reel
WT431RB
1%
3000 Units / Tape & Reel
WT431LA
0.5%
3000 Units / Tape & Reel
WT431LB
1%
3000 Units / Tape & Reel
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03-Nov-06
WT431LT1
ABSOLUTE MAXIMUM RATINGS(Operating temperature range applies unless otherwise specified)
PARAMETER
SYMBOL
VALUE
UNIT
Cathode Voltage
VKA
36
V
Cathode Current Range(Continuous)
IKA
-100 ~ +150
mA
Reference Input Current Range
Iref
-0.05 ~ +10
mA
Operating Junction Temperature
Tj
150
°C
Operating Ambient Temperature
Topr
0~70
°C
Storage Temperature
Tstg
-65 ~ +150
°C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
Min
Typ
Max
UNIT
Cathode Voltage
VKA
VREF
-
36
V
Cathode Current
IKA
1
-
100
mA
ELECTRICAL CHARACTERISTICS(TA=25˚C unless otherwise specified)
PARAMETER
Reference Input Voltage
Deviation of reference Input Voltage
Over temperature
SYMBOL
TEST CONDITIONS
Deviation of reference Input Current
Over Full temperature range
Typ
Max
UNIT
Vref
VKA=VREF, IKA=10mA
-
2.50
-
V
ΔVref /ΔT
VKA=VREF, IKA=10mA
TMIN<=TA<=TMAX
-
4.5
17
mV
-
-1.0
-0.5
-2.7
-2.0
mV/V
Ratio of Change in Reference Input
ΔVKA=10V~VREF
ΔVref /ΔVKA IKA=10mA
Voltage to the change in Cathode Voltage
ΔVKA=36V~10V
Reference Input Current
Min
Iref
IKA=10mA, R1=10kΩ
∞
-
1.5
4
µA
ΔIref /ΔT
IKA=10mA, R1=10kΩ
TA=full temperature
∞
-
0.4
1.2
µA
Minimum Cathode current for Regulation
IKA(min)
VKA=VREF
-
0.45
1.0
mA
Off-State Cathode current
IKA(OFF)
VKA=36V, VREF=0
-
0.05
1.0
µA
VKA=VREF=0, IKA=1 to 100mA
<=
-
0.15
0.5
Ω
Dynamic Impedance
ZKA
CLASSIFICATION OF Vref AND & MARKING
PARAMETER
Rank
Range(V)
Marking
WT431RA
0.5%
2.487~2.512
RA
WT431RB
1%
2.475~2.525
RB
WT431LA
0.5%
2.487~2.512
LA
WT431LB
1%
2.475~2.525
LB
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03-Nov-06
WT431LT1
TYPICAL PERFORMANCE CHARACTERISTICS
A
1
T
1
C
T
RE
C
A
RE
A
A
I
A
C
C
C
C
4
1
1
1
3
1
1
C
Fig 1 Cathode Current Vs Cathode Voltage
C
C
T
I
IN
3
C
1
A
T
1
C
C
C
A
1
I
R
4
3
I
C
3
3
1
4
1
1
3
3
4
1
3C
C
3
4
T
C
R
I
4
R
1
T
I A
1
C
A
1
T
I A 1
A
1
C
A
4
I
A
3
1
1
1
1
1
3
1
D
1
4
1
1
1
1
I
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3
1
4
1
1
1
A
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03-Nov-06
WT431LT1
WT431 LINEAR INTEGRATED CIRCUIT
TE T CIRCUIT
A
IN UT
I
IN UT
I
A
A
IN UT
A
I
A
A
R1
IRE
WT431
R
RE
A
7T
A
C
A
8T
RE
WT431
WT431
RE
RE
1 R1 R
C
IRE R1
A
9T
RE
C
I
A
LICATI N CIRCUIT
IN
WT7805
C
R1
UT
N
R1
RE
R1
RE
RE
R
R
1 R1 R
1
R
WT431
WT431
1 R1 R
RE
R
11
T
WT431
RE
C
1 R1 R
T
R
RE
1
R
I
I
RCL
R
R
WT431
I
WT431
RE
R
I
13 C
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14 C
5/5
RE
L
RCL
C
03-Nov-06