AIC431/TL431A/TL431
Adjustable Precision Shunt Regulator
FEATURES
Precision Reference Voltage.
AIC431 :2.495V
±0.5%
TL431A :2.495V
±1.0%
TL431 :2.495V
±1.6%
Sink Current Capability: 200mA.
Minimum Cathode Current for Regulation:
250µA.
Equivalent Full-Range Temperature Coefficient:
50 ppm/°C.
Fast Turn-On Response.
Low Dynamic Output Impedance: 0.08Ω.
Adjustable Output Voltage.
Low Output Noise.
Space Saving Packages: SOT-89, SOT-23,
TO-92 and SO-8.
DESCRIPTION
The AIC431, TL431A and TL431 are 3-
terminal
regulators
stability
adjustable
with
over
the
precision
applicable
shunt
extended
guaranteed
temperature
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
characteristic,
making
these
devices
excellent improved replacements for zener
diodes in many applications.
APPLICATIONS
Linear Regulators.
Adjustable Supplies.
Switching Power Supplies.
Battery Operated Computers.
Instrumentation.
Computer Disk Drivers.
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.
TYPICAL APPLICATION CIRCUIT
V
IN
+
C1
AIC431
V
OUT
R3
R1 +
C2
R2
V
OUT
=(1+R1/R2) VREF
Precision Regulator
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
DS-431P-04 010405
1
AIC431/TL431A/TL431
ORDERING INFORMATION
AIC431 XXXX
TL431A XXXX
TL431 XXXX
PACKING TYPE
TR: TAPE & REEL
TB: TUBE (for SOP-8)
BG: BAG
PACKAGE TYPE
S: SOP-8
US: SOT-23
UN: SOT-23
X: SOT-89
Z: TO-92
C: COMMERCIAL
P: LEAD FREE COMMERCIAL
SOT-23 (UN)
TOP VIEW
1: CATHODE
2: VREF
3: ANODE
1
PIN CONFIGURATION
SOP-8
TOP VIEW
CATHODE
ANODE
ANODE
NC
1
2
3
4
8 REF
7 ANODE
6 ANODE
5 NC
3
2
3
SOT-23 (US)
TOP VIEW
1: VREF
2: CATHODE
3: ANODE
1
2
Example: AIC431CSTR
in SOP-8 Package & Taping & Reel
Packing Type
AIC431PSTR
in Lead Free SOP-8 Package &
Taping & Reel Packing Type
(CS/PS is not available in BAG
packing type.)
SOT-89
TOP VIEW
1: VREF
2: ANODE
3: CATHODE
TO-92
TOP VIEW
1: VREF
2: ANODE
3: CATHODE
1
2
3
1
2
3
SOT-23 Marking
Part No.
AIC431
TL431
TL431A
CUN
AC1N
AC2N
AC3N
PUN
AC1NP
AC2NP
AC3NP
Part No.
AIC431
TL431
TL431A
CUS
AC1S
AC2S
AC3S
PUS
AC1SP
AC2SP
AC3SP
SOT-89 Marking
Part No.
AIC431
TL431
TL431A
CX
AC01B
AC02B
AC03B
PX
AC1BP
AC2BP
AC3BP
2
AIC431/TL431A/TL431
ABSOLUTE MAXIMUM RATINGS
Cathode Voltage
Continuous Cathode Current
Reference Input Current Range
Operating Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
Power Dissipation
SOT-89 Package
TO-92 Package
30V
-10mA
~ 250mA
10mA
–40°C to 85°C
125°C
–65°C to 150°C
260°C
0.80W
0.78W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
IN
IN
I
IN
R1
I
IN
V
Z
V
Z
I
REF
V
REF
I
Z
R2
I
REF
AIC431
I
Z
AIC431
V
REF
Note: V
Z
=V
REF
(1+R1/R2)+I
REF
xR1
Fig. 1 Test Circuit for V
Z
=V
REF
Fig. 2 Test Circuit for V
Z
>V
REF
IN
V
Z
I
Z(OFF)
AIC431
Fig. 3 Test Circuit for off-state Current
3
AIC431/TL431A/TL431
ELECTRICAL CHARACTERISTICS
(T
A
=25°C, unless otherwise specified.) (Note 1)
PARAMETER
TEST CONDITIONS
V
Z
=V
REF
,
Reference Voltage
I
IN
=10mA (Fig. 1)
AIC431
TL431A
TL431
Deviation of Reference
Input Voltage Over
Temperature
(Note 2)
Ratio of the Change in
Reference Voltage to the
Change in Cathode voltage
Reference Input Current
Deviation of Reference Input
Current over Temperature
Minimum Cathode current for
Regulation
Off-State Current
Dynamic Output Impedance
(Note 3)
V
Z
= V
REF
, I
IN
=10mA,
T
A
= 0°C~ +70°C (Fig. 1)
T
A
= -40°C~ +85°C (Fig. 1)
I
Z
=10mA
(Fig. 2)
∆V
Z
=10V-V
REF
∆V
Z
=30V-10V
∆V
REF
∆V
Z
I
REF
V
DEV
9.0
9.0
-0.5
-0.35
0.8
20
50
-2.0
-1.5
3.5
mV/V
mV/V
µA
mV
V
REF
SYMBOL
MIN.
2.482
2.470
2.455
TYP.
2.495
2.495
2.495
MAX.
2.508
2.520
2.535
UNIT
V
R1 =10KΩ, R2=∞,
I
IN
=10mA (Fig. 2)
R1 =10KΩ, R2=∞,
I
IN
=10mA
T
A
=-40°C ~ +85°C (Fig. 2)
V
Z
=V
REF
(Fig. 1)
V
Z
=20V, V
REF
=0V (Fig. 3)
V
Z
=V
REF
F<1KHz (Fig. 1)
αI
REF
0.3
1.2
µA
I
Z(MIN)
I
Z(OFF)
R
Z
0.25
0.1
0.08
0.5
1.0
0.3
mA
µA
Ω
Note 1:
Specifications are production tested at T
A
=25°C.
Specifications over the -40°C to 85°C operating
temperature
range
are
assured
by
design,
characterization and correlation with Statistical Quality
Controls (SQC).
V
MAX
V
DEV
= V
MAX
-V
MIN
V
MIN
V
MAX
- V
MIN
6
V
DEV
±
±
10
1
ppm
V
REF
(at 25
°
C)
V
REF
(at 25
°
C)
∆
V
REF
=
=
°
C
T2
−
T1
T2
−
T1
Where:
T
2
−
T
1
=full temperature change.
αV
REF
can be positive or negative depending on
whether the slope is positive or negative.
Example: V
DEV
= 9.0mV, V
REF
= 2495mV,
T
2
−
T
1
= 70°C, slope is negative.
9.0mV
106
2495mV
α
V
REF
=
= −
50ppm/
°
C
70
°
C
Note 3:
The dynamic output impedance, Rz, is defined
as:
T
1
TEMPERATURE
T
2
R
Z
=
Note 2:
Deviation of reference input voltage, V
DEV
, is
defined as the maximum variation of the reference input
voltage over the full temperature range.
The average temperature coefficient of the reference
input voltage,
αV
REF
is defined as:
∆
V
Z
∆
I
Z
When the device is programmed with two external
resistors, R1 and R2, (see Fig. 2), the dynamic output
impedance of the overall circuit, is defined as:
r
z
=
∆
V
≅
Rz
1
+
R1
R2
∆
I
[ ]
4
AIC431/TL431A/TL431
TYPICAL PERFORMANCE CHARACTERISTICS
1000
800
600
400
200
0
-200
-400
-600
-1.0
2.58
Reference Voltage (V)
V
Z
=V
REF
T
A
=25°C
2.56
V
Z
=V
REF
I
Z
=10mA
V
REF
=2.535V
V
REF
=2.495V
I
Z(MIN)
Cathode Current (µA)
2.54
2.52
2.50
2.48
2.46
2.44
2.42
V
REF
=2.455V
-20
0
20
40
60
80
100
120
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
2.40
-40
Cathode Voltage (V)
Fig. 4 Cathode Current vs. Cathode Voltage
Temperature (°C)
Fig. 5 Reference Voltage vs. Temperature
1.20
0.28
Reference Input Current (µA)
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
-40
-20
0
20
40
Dynamic Impedance (Ω)
R1=10KΩ
R2=∞
I
Z
=10mA
0.24
0.20
0.16
0.12
0.08
0.04
0.00
-40
V
Z
=V
REF
I
Z
=1mA to100mA
F <1KHz
60
80
100
120
-20
0
20
40
60
80
100
120
Temperature (°C)
Fig. 6 Reference Input Current vs. Temperature
Temperature (°C)
Fig. 7 Dynamic Impedance vs. Temperature
Change in Reference Voltage (mV)
0
2.5
-1
Off-State Cathode Current (µA)
2.0
I
Z
=10mA
-2
V
REF
=0V
1.5
T
A
=25°C
V
Z
=30V
-3
1.0
-4
-5
0.5
-6
0
5
10
15
20
25
30
35
40
0.0
-40
-20
0
20
40
60
80
100
120
Cathode Voltage (V)
Fig. 8 Change in Reference Voltage vs. Cathode Voltage
Temperature (°C)
Fig. 9 Off-State Cathode Current vs. Temperature
5
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