AIC TL431CX, TL431CZ, TL431CU, TL431ACZ, TL431ACX Datasheet
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AIC431/TL431A/TL431
Adjustable Precision Shunt Regulators
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
www.analog.com.tw
DS-431-06 May 31, 01 TEL: 886-3-5772500 FAX: 886-3-5772510 1
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FEATURES
l Unconditionally Stable.
l Precision Reference Voltage.
AIC431 :2.495V ±0.5%
TL431A :2.495V ±1.0%
TL431 :2.495V ±1.6%
l Sink Current Capability: 200mA.
l Minimum Cathode Current for Regulation: 250µA.
l Equivalent Full-Range Temperature Coefficient:
50 ppm/°C.
l Fast Turn-On Response.
l Low Dynamic Output Impedance: 0.08Ω.
l Adjustable Output Voltage.
l Low Output Noise.
l Space Saving SOT-89, SOT-23, TO-92 and SO8
packages.
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TYPICAL APPLICATION CIRCUIT
V
IN
AIC431
+
V
OUT
R1
R2
+
V
OUT
=(1+R1/R2)V
REF
Precision Regulator
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DESCRIPTION
The AIC431/TL431A/TL431 are 3-terminal adjustable precision shunt regulators with guaranteed temperature stability over the applicable extended commercial temperature range.
The output voltage may be set at any level
greater than 2.495V (V
REF
) up to 30V merely
by selecting two external resistors that act as
a voltage divider network. These devices have
a typical output impedance of 0.08Ω. Active
output circuitry provides a very sharp turn-on
characteristics, making these devices excellent improved replacements for zener diodes
in many applications.
The precise ±0.5% reference voltage tolerance of the AIC431 makes it possible in
many applications to avoid the use of a variable resistor, consequently saving cost and
eliminating drift and reliability problems associated with it.
AIC431/TL431A/TL431
2
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ORDERING INFORMATION
ORDER NUMBER PIN CONFIGURATION
AIC431 CX
TL431A CX
TL431
CX
PACKAGING TYPE
S: SMALL OUTLINE
U: SOT-23
X: SOT-89
Z: TO-92
AIC431CX
TL431ACX
TL431CX
(SOT-89)
FRONT VIEW
1: VREF
2: ANODE
3: CATHODE
1
2
3
1 2 3
AIC431CZ
TL431ACZ
TL431CZ
(TO-92)
FRONT VIEW
1: VREF
2: ANODE
3: CATHODE
ANODE
REF
ANODE
NC
ANODE
ANODE
NC
CATHOD
1
3
4
2
8
6
5
7
AIC431CS
TL431ACS
TL431CS
(SO-8)
TOP VIEW
AIC431CUN
TL431ACUN
TL431CUN
(SOT-23)
FRONT VIEW
1: CATHODE
2: VREF
3: ANODE
1
3
2
AIC431CUS
TL431ACUS
TL431CUS
(SOT-23)
FRONT VIEW
1: VREF
2: CATHODE
3: ANODE
3
1
2
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ABSOLUTE MAXIMUM RATINGS
Cathode Voltage ........……………...............……………..………...............................30V
Continuous Cathode Current ...................………….……...................... -10mA ~ 250mA
Reference Input Current Range .......…………........……..........…………………… 10mA
Operating Temperature Range .......………….........……….........……………. -40°C ~ 85°C
Lead Temperature .......…………..................………………..………………………. 260°C
Storage Temperature .......…………..................……………..…………….. -65°C ~ 150°C
Power Dissipation (Notes 1, 2) SOT-89 Package .........…………...... 0.80W
TO-92 Package ….......…………....... 0.78W
Note 1: T
J, max
= 150°C.
Note 2: Ratings apply to ambient temperature at 25°C.
AIC431/TL431A/TL431
3
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TEST CIRCUITS
V
REF
I
REF
I
Z
V
Z
I
L
IN
AIC431
R2
R1
V
REF
I
REFIZVZ
IN
I
L
AIC431
Note: VZ=V
REF
(1+R1/R2)+I
REF
xR1
Fig. 1 Test Circuit for VZ=V
REF
Fig. 2 Test circuit for VZ>V
REF
IN
VZ
IZ(OFF)
AIC431
Fig. 3 Test circuit for off-state Current
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ELECTRICAL CHARACTERISTICS
(Ta=25°C, unless otherwise spec ified.)
PARAMETER TEST CONDITIONS
SYMBOL
MIN. TYP. MAX. UNIT
VZ=V
REF
, AIC431 2.482 2.495 2.508
IL =10mA (Fig. 1) TL431A 2.470 2.495 2.520
Reference Voltage
TL431
V
REF
2.455 2.495 2.535
V
Deviation of Reference
Input Voltage Over
Temperature (Note 3)
V
Z
= V
REF
, I
L
=10mA,
Ta = 0°C~ +85°C (Fig. 1)
V
DEV
9.0 20 mV
Ratio of the Change in Reference Voltage to
IZ=10mA ∆VZ=10V-V
REF
-0.5 -2.0 mV/V
the Change in Cathode voltage
(Fig. 2) ∆VZ=30V-10V
∆V
REF
∆V
Z
-0.35 -1.5 mV/V
Reference Input Current R1 =10KΩ, R2= ∞,
I
L
=10mA (Fig. 2)
I
REF
0.8 3.5 µA
AIC431/TL431A/TL431
4
Deviation of Reference Input
Current over Temperature
R1 =10KΩ, R2= ∞,
I
L
=10mA
Ta =-20°C ~ +85°C (Fig. 2)
αI
REF
0.3 1.2 µA
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