WINGS TL431LT1

TL431
Adjustable Precision Shunt Regulator
• Programmable Output Voltage to 36V
TO-92
Pin Configuration
• Low Dynamic Output Impedance 0.2Ω
TL431CLP
• Sink Current Capability of 0.1 mA to 100 mA
CATHODE
• Equivalent Full-Range Temperature Coefficient of 50 ppm/oC
ANODE
R
REF
• Temperature Compensated for Operation over Full Rated
A
C
Operating Temperature Range
SOT—
—23
• Low Output Noise Voltage
SOT-89
TL431LT1
• Fast Turn on Response
TL431CPK
1. REF
2. CATHODE
3. ANODE
REF ANODE CATHODE
DESCRIPTION
The TL431 is a three-terminal adjustable regulator series with a guaranteed thermal stability over
applicable temperature ranges. The output voltage may be set to any value between Vref
(approximately 2.5 volts) and 36 volts with two external resistors. These devices have a typical
dynamic output impedance of 0.2Ω. Active output circuitry provides a very sharp turn-on
characteristic, making these devices excellent replacement for zener diodes in many applications.
The TL431 is characterized for operation from 0oC to +70oC.
SYMBOL
C a th o d e
(K)
FUNCTIONAL BLOCK DIAGRAM
Re fe re n c e
(R )
C a th o d e
(K)
+
Re fe re n c e
(R )
-
Anod e
(A )
2 .5 V re f
A n o d e (A )
SCHEMATIC DIAGRAM
Wing Shing Computer Components Co., (H.K.)Ltd.
Homepage: http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153
E-mail: [email protected]
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WS
TL431
ABSOLUTE MAXIMUM RATINGS
(Operating temperature range applies unless otherwise specified)
Characteristic
Symbol
Value
Unit
VKA
37
V
IK
-100 ~ +150
mA
Reference Input Current Range
IREF
0.05 ~ +10
mA
Operating Temperature Range
Ta
0 ~ +70
o
Storage Temperature Range
Tstg
-65 ~ +150
o
Cathode Voltage
Cathode Current Range (Continuous)
C
C
RECOMMENDED OPERATING CONDITIONS
Characteristic
Symbol
Test Condition
Min
Typ
Max
Unit
Cathode Voltage
VKA
VREF
36
V
Cathode Current
IK
1.0
100
mA
ELECTRICAL CHARACTERISTICS
(Ta = 25oC, unless otherwise specified)
Characteristic
Symbol
Test Condition
Min
Typ
Max
Unit
Reference Input Voltage
VREF
VKA = VREF, IK = 10mA
2.44
2.495
2.55
V
Deviation of Reference
Input Voltage OverTemperature (Note 1)
VREF(dev)
VKA = VREF, IK = 10mA
4
17
mV
∆VKA = 10V-VREF
-1.4
-2.7
mV/V
∆KKA = 36V-10V
-1.0
-2.0
Ratio of Change in
Reference Input Voltage
to the Change in
Tmin ≤ Ta ≤ Tmax
∆V R EF
∆V K A
Cathode Voltage
IK = 10mA
Reference Input Current
IREF
IK = 10mA, R1 = 10KΩ, R2 = ∞
2,0
4
µA
Deviation of Reference
Input Current Over Full
Temperature Range
IREF(dev)
IK = 10mA, R1 = 10KΩ, R2 = ∞
0.4
1.2
µA
Minimum Cathode
Current for Regulation
Off-State Cathode
Current
IK(min)
VKA = VREF
0.4
1.0
mA
IK(off)
VKA = 36V, VREF = 0
0.1
1.0
µA
ZKA
VKA = VREF, IK = 10mA to
100mA
0.2
0.5
Ω
Dynamic Impedance
(Note2)
Ta = Full Range
f ≤ 1.0KHz
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TL431
Note: 1. The deviation parameters VREF(dev) and IREF(dev) are defined as the differences between the maximum and minimum
values obtained over the rated temperature range.
VREF(dev) = VREF(max) - VREF(min)
The equivalent full-range temperature coefficient of the reference input voltage, αVREF is defined as:
)=
ppm
αVREF
(
°C
(
V R EF(dev)
V R [email protected] ° C
) × 10
6
∆ Ta
where ∆Ta is the rated operating free-air temperature range of the device.
αVREF can be positive or negative depending on whether minimum
VREF or maximum VREF respectively, occurs at the lower temperature.
2.
The dynamic impedance is defined as:
ZK A
=
∆ VKA
∆ IK
When the device is operated with two external resistors (see Figure 2), the total dynamic impedance of the circuit is
given by:
Z'
=
∆V
∆I
= Z K A (1+
R1
)
R2
TEST CIRCUITS
Fig.2. Test Circuit for VKA ≥ VREF
Fig.1. Test Circuit for VKA = VREF
Fig.3. Test Circuit for Ioff
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WS
TL431
PAD LAYOUT
2
(0 ,0 )
T L 4 3 1 PA D D I A G R A M
C h ip size : 1 3 4 5 x 9 9 0
Pa d size :
U n it
: µm
3
1
4
PAD LOCATION
Unit: µm
Pad No.
Pad Name
Description
X
Y
1
R
Reference
235
400
2
K
Cathode
-505
343.5
3
K
Cathode
-497.5
-346
4
A
Anode
-177.5
-341.5
Physical Characteristics
460 ± 40 µm (thickness)
Wafers
4 inch
Size
1.35 × 0.99 mm
Scribe width
90 µm
Wafer’s Backside
Ti – Ni – Ag: Ti - 0.1 ± 0.02 µm
Ni - 0.5 ± 0.1 µm
Ag - 0.6 ± 0.1 µm
Passivation
PSG
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