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TL431
Adjustable Precision Shunt Regulator
* Programmable Output Voltage to 36V TO-92 Pin Configuration * Low Dynamic Output Impedance 0.2 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 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 0.2. 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.
REF ANODE CATHODE
2. CATHODE 3. ANODE
SYMBOL
C a t ode h (K) Re fe r n c e e (R ) Re fe r n c e e (R )
FUNCTIONAL BLOCK DIAGRAM
C a t ode h (K)
+ -
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: wsccltd@hkstar.com
4-1
WS TL431
ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified) Characteristic Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Operating Temperature Range Storage Temperature Range RECOMMENDED OPERATING CONDITIONS Characteristic Cathode Voltage Cathode Current Symbol VKA IK Test Condition Min VREF 1.0 Typ Max 36 100 Unit V mA Symbol VKA IK IREF Ta Tstg Value 37 -100 ~ +150 0.05 ~ +10 0 ~ +70 -65 ~ +150 Unit V mA mA
o o
C C
ELECTRICAL CHARACTERISTICS (Ta = 25oC, unless otherwise specified) Characteristic Reference Input Voltage Deviation of Reference Input Voltage OverTemperature (Note 1) Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance (Note2) IREF IREF(dev) Symbol VREF VREF(dev) Test Condition VKA = VREF, IK = 10mA VKA = VREF, IK = 10mA Tmin Ta Tmax
V R EF V K A
Min 2.44
Typ 2.495 4
Max 2.55 17
Unit V mV
IK = 10mA
VKA = 10V-VREF
-1.4
-2.7
mV/V
KKA = 36V-10V IK = 10mA, R1 = 10K, R2 = IK = 10mA, R1 = 10K, R2 = Ta = Full Range IK(min) IK(off) ZKA VKA = VREF VKA = 36V, VREF = 0 VKA = VREF, IK = 10mA to 100mA f 1.0KHz
-1.0 2,0 0.4
-2.0 4 1.2 A A
0.4 0.1 0.2
1.0 1.0 0.5
mA A
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WS 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, VREF is defined as:
ppm
VREF
(
C
)=
(
V R EF(dev) V R EF@ C Ta
) x 10
6
where Ta is the rated operating free-air temperature range of the device. VREF 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 I K
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
= ZK A (1+
R1 R2
)
TEST CIRCUITS
Fig.1. Test Circuit for VKA = VREF Fig.2. 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 si : 1 3 4 5 x 9 9 0 ze Pa d si : ze U ni t : m
3
4
1
PAD LOCATION
Unit: m Pad No. 1 2 3 4 Pad Name R K K A Description Reference Cathode Cathode Anode X 235 -505 -497.5 -177.5 Y 400 343.5 -346 -341.5
Physical Characteristics Wafers Size Scribe width Wafer's Backside 4 inch 1.35 x 0.99 mm 90 m Ti - Ni - Ag: Ti - 0.1 0.02 m Ni - 0.5 0.1 m Ag - 0.6 0.1 m Passivation PSG 460 40 m (thickness)
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