AP432/AP432A
ADJUSTABLE PRECISION SHUNT REGULATOR
Features
•
•
•
•
•
•
•
•
•
•
•
Precision reference voltage
AP432 : 1.24V
±
1%
AP432A : 1.24V
±
0.5%
Sink current capability: 200mA
Minimum cathode current for regulation: 150µA
o
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
Packages: SOT89-3L, TO92-3L, SOP-8L, SOT23,
SOT25, SC-59
General Description
The AP432/432A 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 1.24\/ (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
AP432/432A 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
Ordering Information
A P 4 3 2
X X X X
Reference Voltage
Tolerance:
Blank : +/- 1%
A
: +/- 0.5%
Package
Blank :
Y
:
SA :
W
:
R
:
Q
:
V
:
SOP-8L
SOT89-3L
SOT23
SC59
SC59
SOT25
TO92-3L
Lead-Free
Blank : Standard
L
: Lead-Free
G
: Green
(Note1)
-U
-B
-7/-13
-A
Packing
:
:
:
:
Tube
Bulk
Taping
Ammo Box
Note:
1. Only for SOT23
Device
(Note 2)
AP432(A)SA
AP432(A)Q
AP432(A)W
AP432(A)R
AP432(A)
AP432(A)Y
AP432(A)V
Notes:
Package Packaging
Code
(Note 3)
SA
Q
W
R
Y
V
SOT23
SOT25
SC59
SC59
SOP-8L
SOT89-3L
TO92-3L
7” Tape and Reel
Part
Quantity
Number
Suffix
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
NA
NA
NA
-7
-7
-7
-7
NA
NA
NA
13” Tape and Reel
Ammo Box
Part
Part
Quantity
Number Quantity Number
Suffix
Suffix
10000/Tape & Reel
10000/Tape & Reel
10000/Tape & Reel
10000/Tape & Reel
2500/Tape & Reel
2500/Tape & Reel
NA
-13
-13
-13
-13
-13
-13
NA
NA
NA
NA
NA
NA
NA
2000/Box
NA
NA
NA
NA
NA
NA
-A
2. Suffix “A” denotes AP432A device.
3. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AP432/AP432A Rev. 1
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Diodes Incorporated
AP432/AP432A
ADJUSTABLE PRECISION SHUNT REGULATOR
Typical Application Circuit
V
IN
V
OUT
+
C
in
AP432
R1
+
C
out
R2
V
OUT
= (1+R1/R2)V
REF
Precision Regulator
Block Diagram
REF (R)
+
Cathode (C)
-
V
REF
Symbol
C a th o d e (C )
R E F
(R )
Anode (A)
A n o d e (A )
AP432/AP432A Rev. 1
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AP432/AP432A
ADJUSTABLE PRECISION SHUNT REGULATOR
Pin Connections
Package
Pin Configuration (Top View )
NC
SOT25
NC
CATHODE
1
2
4 REF
3
Package
Pin Configuration (Top View )
CATHODE
SOP-8L
ANODE
ANODE
NC
1
2
3
4
8
7
6
5
REF
ANODE
ANODE
NC
5 ANODE
SC-59
(Package
Code -W)
3 REF
ANODE 1
2 CATHODE
SOT 23
ANODE 1
3 REF
2 CATHODE
3 Cathode
SC-59
(Package
Code -R)
3 CATHODE
ANODE
1
2 REF
SOT89-3L
2 Anode
1 REF
3 Cathode
2 Anode
1 REF
Absolute Maximum Ratings
Cathode Voltage……………....……...........…..........……………………………………...…………………………………………….…….20V
Continuous cathode current ………………………………......................……………………………………………………...-10mA ~ 250mA
Reference input current range ………………………...….………....................……………………………………………………………10mA
o
o
Operating temperature range..…..…….…………………………………………………………………………………..………… -20 C ~ 85 C
o
Lead Temperature……………….…………….…..……………………………………………………………...………………..……........260 C
o
o
Storage Temperature ……………………..............…......………………….......…………………………………………...........-65 C ~ 150 C
Power Dissipation (Notes 4, 5)
SOT23 Package…………………………………………………………………………………. 250mW
SOT25 Package .………….....…………………….....…....………………...…......….…....... 250mW
SC59 Package......................................................................………………....……........…. 400mW
SOP-8L Package ……………..…………….......……………………………………...…....…. 600mW
SOT89-3L Package ...................................................................………………....……....... 800mW
TO92-3L Package……………………………………………………………………………….. 780mW
Note: 4. TJ, max =150
o
C.
Note :5. Ratings apply to ambient temperature at 25
o
C.
AP432/AP432A Rev. 1
+
+
TO92-3L
+
3 of 11
AUGUST 2006
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AP432/AP432A
ADJUSTABLE PRECISION SHUNT REGULATOR
Electrical Characteristics
Parameter
Reference Voltage
Deviation of Reference Input Voltage over
Temperature (Note 6)
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 7)
( T
A
= 25
o
C, V
+
= +5.0V, unless otherwise stated )
Symbol
V
REF
V
REF
Min.
1.227
1.233
Typ.
1.24
3.0
-1.4
1.4
0.4
0.15
0.1
0.2
Max.
1.252
1.246
20
-2.0
3.5
1.2
0.3
1.0
0.5
Unit
V
mV
mV/V
µA
µA
mA
µA
Ω
Test conditions
AP432
V
KA
= Vref,
I
KA
= 10mA (Fig.1)
AP432A
V
KA
= V
REF
, I
KA
= 10mA ,
Ta = full range
(Fig.1)
I
KA
= 10mA
(Fig.2)
V
KA
= 20 ~V
REF
∆
V
REF
∆
V
KA
R1 = 10KΩ,R2 =
∞
I
KA
= 10mA (Fig.2)
R1 = 10KΩ,R2 =
∞
I
KA
= 10mA
Ta = Full range (Fig.2)
V
KA
= V
REF
(Fig.1)
V
KA
= 20V , V
REF
= 0V (Fig.3)
V
KA
= V
REF
Frequency
≤
1KHz (Fig.1)
I
REF
αI
REF
I
KA(min)
I
KA(off)
Z
KA
V
MAX
V
DEV
= V
MAX
- V
MIN
V
MIN
T
I
Note 6.
Temperature
T
2
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:
α
V
REF
Where:
V
DEV
)
⋅
10
6
V (25
°
C)
……………………..……………….. (
ppm
)
=
REF
°
C
T
2
−
T
1
(
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
AP432/AP432A Rev. 1
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Diodes Incorporated
AP432/AP432A
ADJUSTABLE PRECISION SHUNT REGULATOR
Test Circuits
Input
IN
IN
V
KA
I
KA
R1
V
REF
I
REF
V
REF
I
KA
V
KA
V
KA
R2
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
AP432/AP432A Rev. 1
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