NOT RECOMMENDED FOR NEW DESIGN
USE AS431
AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Description
The AP431 and AP431A 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 36V merely by
selecting two external resistors that act as a voltage divider network.
These devices have a typical output impedance of 0.2Ω. Active output
circuitry provides very sharp turn-on characteristics, making these
devices excellent improved replacements for Zener diodes in many
applications.
Pin Assignments
(1) SOT25
(Top View)
NC
NC
CATHODE
1
2
3
4
REF
5
ANODE
CATHODE
ANODE
ANODE
NC
(2) SO-8
(Top View)
1
2
3
4
8
7
6
5
REF
ANODE
ANODE
NC
(3) SC59
(Top View)
(4) SC59R
(Top View)
REF
3 ANODE
The
precise
(+/-)
1%
reference
voltage
tolerance
of
the
CATHODE
1
AP431/AP431A make 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.
1
3
ANODE
REF
2
CATHODE
2
Features
•
•
•
•
•
•
•
•
•
•
•
•
Precision Reference Voltage
AP431: 2.495V ± 1%
AP431A: 2.495V ± 0.5%
Sink Current Capability: 200mA
Minimum Cathode Current for Regulation: 300μA
Equivalent Full-Range Temp Coefficient: 30ppm/°C
Fast Turn-On Response
Low Dynamic Output Impedance: 0.2Ω
Programmable Output Voltage to 36V
Low Output Noise
Lead Free Packages: SOT25, SC59, SC59R, SOT89 and SO-8
Totally Lead-Free; RoHS Compliant (Notes 1 & 2)
SOT23, SOT23R, SOT25, SC59, SC59R, SO-8, SOT89:
Available in “Green” Molding Compound (No Br, Sb). See
“Ordering Information”
Halogen and Antimony Free. “Green” Device (Note 3)
(5) SOT23
(Top View)
CATHODE
1
3 ANODE
REF 2
(6) SOT23R
(Top View)
REF 1
3 ANODE
CATHODE 2
(7) SOT89
(Top View)
1
2
3
REF Anode Cathode
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
AP431/AP431A
Document number: DS31002 Rev. 21 - 2
1 of 17
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September 2014
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE AS431
AP431/AP431A
Typical Applications Circuit
V
IN
V
OUT
+
C
IN
R1
+
C
OUT
AP431
R2
V
OUT
= (1 + R1/ R2) V
REF
Precision Regulator
Symbol
Cathode (C)
REF (R)
Anode (A)
Functional Block Diagram
REF (R)
+
-
V
REF
Cathode (C)
Anode (A)
AP431/AP431A
Document number: DS31002 Rev. 21 - 2
2 of 17
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September 2014
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE AS431
AP431/AP431A
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
Parameter
Cathode Voltage
Continuous Cathode Current
Reference Input Current
Operating Temperature
Storage Temperature
SOT23(R)
Power Dissipation (Notes 4, 5)
SOT25
SC59(R)
SO-8
SOT89
Rating
+36
-10 to +250
10
-20 to +85
-65 to +150
400
550
400
600
800
Unit
V
mA
mA
°C
°C
mW
mW
mW
mW
mW
Notes:
4. T
J
, max = +150°C.
5. Ratings apply to ambient temperature at +25°C.
Electrical Characteristics
(@T
A
= +25°C, V
DD
= 3V; unless otherwise specified.)
Symbol
V
REF
Parameter
Reference voltage
Conditions
V
KA
= V
REF
,
AP431
I
KA
= 10mA (Figure 1) AP431A
V
KA
= V
REF
, I
KA
= 10mA
T
A
= Full Range (Figure 1)
Min
2.470
2.482
Typ
2.495
Max
2.520
2.507
Units
V
V
DEV
ΔV
REF
ΔV
KA
I
REF
αI
REF
I
KA(MIN)
I
KA(OFF)
|Z
KA
|
Deviation of reference input voltage over
temperature (Note 5)
—
—
—
—
—
—
—
—
8.0
-1.4
-1
1.4
0.4
0.19
0.1
0.2
20.0
-2.0
-2
3.5
1.2
0.50
1.0
0.5
mV
mV/V
mV/V
µA
µA
mA
µA
Ω
V
KA
= V
REF
to 10V
Ratio of the change in reference voltage to
I
KA
= 10mA (Figure 2)
the change in cathode voltage
V
KA
= 10V to 36V
Refernce input current
Deviation of reference input current over
temperature
Minimum cathode current for regulation
Off-state current
Dynamic output impedance (Note 7)
R1 = 10KΩ, R2 = ∞ I
KA
= 10mA (Figure 2)
R1 = 10KΩ, R2 = ∞ I
KA
= 10mA
T
A
= Full range (Figure 2)
V
KA
= V
REF
(Figure 1)
V
KA
= 36V, V
REF
= 0V (Figure 3)
V
KA
= V
REF
V
KA
= V
REF
ΔI
KA
= 0.1mA to 15mA
Frequency ≤ 1KHz (Figure 1)
AP431/AP431A
Document number: DS31002 Rev. 21 - 2
3 of 17
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September 2014
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE AS431
AP431/AP431A
Electrical Characteristics
(cont.) (@T
A
= +25°C, V
DD
= 3V; unless otherwise specified.)
V
MAX
V
DEV
= V
MAX
- V
MIN
V
MIN
T1
Temperature
T2
Note: 6. Deviation of reference input voltage, V
DEV
, is defined as the maximum variation of the reference over the full temperature range.
The average temperature coefficient of the reference input voltage
αV
REF
is defined as:
αV
REF
V
DEV
)
⋅
10
6
V
REF
(25
°
C)
……………………..………..…………….. (
ppm )
=
°
C
T
2
−
T
1
(
Where:
T2 – T1 = full temperature change.
αV
REF
can be positive or negative depending on whether the slope is positive or negative.
Note:
7. The dynamic output impedance, R
Z
, is defined as:
Z
KA
=
∆
V
KA
∆
I
KA
When the device is programmed with two external resistors R1 and R2 (see Figure 2.), the dynamic output impedance of the overall
circuit, is defined as:
Z
KA '
=
∆
v
≈
Z
KA
∆
i
(1
+
R1
)
R2
Test Conditions
Input
IN
IN
V
KA
I
KA
R1
I
REF
V
REF
I
KA
V
KA
V
KA
V
REF
R2
I
Z(OFF)
Note: V
KA
= V
REF
(1 + R1/R2) + I
REF
xR1
Figure. 1 Test Circuit for V
KA
= V
REF
Figure. 2 Test Circuit for V
KA
> V
REF
4 of 17
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Figure. 3 Test Circuit for Off-State Current
AP431/AP431A
Document number: DS31002 Rev. 21 - 2
September 2014
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE AS431
AP431/AP431A
Typical Performace Characteristics
100
V
KA
= V
REF
T
A
= 25
°
C
600
CATHODE CURRENT(
µ
A)
V
KA
= V
REF
T
A
= 25
°
C
CATHODE CURRENT(mA)
400
I
KA(MIN)
0
200
0
-100
-1
-0.5
0.5
1.5
CATHODE VOLTAGE (V)
Cathode Current vs. Cathode Voltage
2.5
-200
-1
0
0.5
1
1.5
2
CATHODE VOLTAGE (V)
Cathode Current (
µ
A) vs. Cathode Voltage
-0.5
2.5
250
REFERENCE INPUT CURRENT(
µ
A)
2
R1 = 10k
I
KA
= 10mA
1.8
CATHODE CURRENT(mA)
2495
1.6
2490
1.4
2485
1.2
2480
-40
40
20
60
80
0
FREE-AIR TEMPERATURE (C)
Reference Voltage vs. Free-Air Temperature
-20
1
-50
0
25
50
75
100
125
FREE-AIR TEMPERATURE (V)
Reverence Input Current vs. Free Temperature
-25
0
CHANGE in REFERENCE VOLTAGE (mV)
-2
I
KA
= 10mA
T
A
= 25
°
C
-4
-6
-8
-10
-12
0
10
15
20
25
30
CATHODE VOLTAGE (V)
Change in Reference Voltage vs. Cathode Voltage
5
AP431/AP431A
Document number: DS31002 Rev. 21 - 2
5 of 17
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September 2014
© Diodes Incorporated
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