NOT RECOMMENDED FOR NEW DESIGN
USE AZ431L
AP432/AP432A
ADJUSTABLE PRECISION SHUNT REGULATOR
Description
The AP432 and AP432A are 3-terminal adjustable precision shunt
regulators with guaranteed stable temperature over the applicable
extended commercial temperature range. The output voltage may be
set at any level greater than 1.24V (V
REF
) up to 20V 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.
The
precise
+/-1%
reference
voltage
tolerance
of
the
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)
3 REF
ANODE
1
2 CATHODE
(4) SC59R
(Top View)
3 CATHODE
ANODE 1
2 REF
AP432/AP432A 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.
Features
•
Precision Reference Voltage
AP432 : 1.24V ± 1%
AP432A : 1.24V ± 0.5%
Sink Current Capability: 200mA
Minimum Cathode Current for Regulation: 150μA
Equivalent Full-Range Temp Coefficient: 30 ppm/°C
Fast Turn-On Response
Low Dynamic Output Impedance: 0.2Ω
Programmable Output Voltage to 20V
Low Output Noise
Lead Free packages: SOT25, SC59, SC59R and SOT89-3
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
SOT23, SOT23R, SOT25, SC59, SC59R, SO-8 and SOT89:
Available in “Green” Molding Compound (No Br, Sb)
Halogen and Antimony Free. “Green” Device (Note 3)
•
•
•
•
•
•
•
•
•
(5) SOT23
(Top View)
3
ANODE
1
2 CATHOD
REF
ANODE
(6) SOT23R
(Top View)
3 CATHODE
1
2 REF
(7) SOT89-3
(Top View)
1
2
3
REF Anode Cathode
Notes:
1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
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.
Typical Applications Circuit
V
IN
V
OUT
+
C
in
AP432
R1
+
C
out
R2
V
OUT
= (1+R1/R2)V
REF
Precision Regulator
AP432/AP432A
Document number: DS31003 Rev. 19 - 3
1 of 15
www.diodes.com
September 2014
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE AZ431L
AP432/AP432A
Functional Block Diagram
REF (R)
+
V
REF
Anode (A)
Functional Block Diagram
Cathode (C)
REF (R)
Anode (A)
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
CV
I
CC
I
REF
T
OP
T
ST
Parameter
Cathode Voltage
Continuous Cathode Current
Reference Input Current
Operating Temperature
Storage Temperature
SOT23(R)
SOT25
SC59(R)
SO-8
SOT89-3
Rating
20
-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
P
D
Power Dissipation
(Notes 4, 5)
Notes:
4. T
J
, max = +150°C.
5. Ratings apply to ambient temperature at +25°C.
AP432/AP432A
Document number: DS31003 Rev. 19 - 3
2 of 15
www.diodes.com
Cathode (C)
-
September 2014
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE AZ431L
AP432/AP432A
Electrical Characteristics
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
REF
V
REF
ΔV
REF
ΔV
KA
I
REF
αI
REF
I
KA(MIN)
I
KA(OFF)
|Z
KA
|
Parameter
Reference voltage
Deviation of reference input voltage over
temperature
(Note 4)
Test Conditions
V
KA
= V
REF
,
I
KA
= 10mA (Figure 1)
V
KA
= V
REF
, I
KA
= 10mA,
Ta = Full range (Figure 1)
AP432
AP432A
Min
1.227
1.233
Typ
1.24
3.0
Max
1.252
1.246
20
Unit
V
mV
Ratio of the change in reference voltage to
I
KA
= 10mA (Figure 2)
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 5)
V
KA
= 20 ~ V
REF
-1.4
1.4
0.4
0.15
0.1
0.2
-2.0
3.5
1.2
0.3
1.0
0.5
mV/V
µA
µA
mA
µA
Ω
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 ~ 15mA
Frequency
≤
1KHz (Figure 1)
V
MAX
V
DEV
= V
MAX
- V
MIN
V
MIN
T
I
Notes:
Temperature
T
2
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:
VDEV
)
⋅
10 6
VREF (25
°
C)
……………………..……………….. (
ppm
)
αVREF
=
°
C
T2
−
T1
(
Where:
T2 – T1 = full temperature change.
αV
REF
can be positive or negative depending on whether the slope is positive or negative.
Notes:
7. The dynamic output impedance, R
Z
, is defined as:
ZKA
=
∆
VKA
∆
IKA
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:
ZKA '
=
∆
v
≈
ZKA
∆
i
(1
+
R1
)
R2
AP432/AP432A
Document number: DS31003 Rev. 19 - 3
3 of 15
www.diodes.com
September 2014
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE AZ431L
AP432/AP432A
Test Circuits
Input
IN
IN
V
KA
I
KA
R1
V
REF
R2
I
REF
V
REF
I
KA
V
KA
V
KA
I
Z(OFF)
Note:V
KA
=V
REF
(1+R1/R2)+I
REFx
R1
Fig 1. Test Circuit for V
KA
= V
REF
Fig 2. Test Circuit for V
KA
> V
REF
Fig 3. Test Circuit for Off-State Current
Typical Performance Characteristics
AP432/AP432A
Document number: DS31003 Rev. 19 - 3
4 of 15
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September 2014
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE AZ431L
AP432/AP432A
Typical Performance Characteristics
(cont.)
Small-Signal Voltage Amplification vs Frequency
60
A
V
-Small Signal Voltage Amplification (dB)
50
I
KA
=10mA
T
A
=25
o
C
15KΩ
9µF
Output
I
KA
232Ω
40
30
20
Test Circuit for Voltage Amplification
10
0
1K
10K
100K
1M
10M
f-Frequency-Hz
Reference Impedance vs Frequency
100
∣ZKA∣
Reference Impedance (Ω)
I
KA
=10mA
o
T =25 C
A
10
50Ω
-
+
1
Test Circuit for Reference Impedance
0.1
1K
10K
100K
1M
10M
f-Frequency-Hz
STABILITY BOUNDARY CONDITIONS
†
100
90
80
A V
KA
=V
ref
B V
KA
=5V
C V
KA
=10V
D V
KA
=15V
TA=25
o
C
C
L
B
Stable
I
KA
-Cathode Current-mA
70
60
Stable
50
40
30
20
10
0
0.001
0.01
0.1
1
C
L
-Load Capacitance-µF
10
C
L
+
R2
-
V
BATT
C
A
Test Circuit for Curve A
D
R1=10KΩ
+The areas under the curves represent conditions that may cause the
device to oscillate. For curves B, C, and D, R2 and V+ were adjusted
to establish the initial V
KA
and I
KA
conditions with C
L
=0.V
BATT
and C
L
were then adjusted to determine the ranges of stability.
AP432/AP432A
Document number: DS31003 Rev. 19 - 3
5 of 15
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-
8.25KΩ
+
-
+
GND
1KΩ
Output
I KA
GND
150Ω
I KA
+
-
V
BATT
I KA
150Ω
Test Circuit for Curve B, C, and D
September 2014
© Diodes Incorporated
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