Adjustable Precision Shunt Regulator
AP431/AP431A
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. A5 May.23, 2003
1/16
ATC
Features
Precision reference voltage
AP431 : 2.495V 1%
AP431A : 2.495V 0.5%
Sink current capability: 200mA
Minimum cathode current for regulation: 300A
Equivalent full-range temp coefficient: 30 ppm/
o
C
Fast turn-on response
Low dynamic output impedance: 0.2
Programmable output voltage to 36v
Low output noise.
Packages: TO92, SOT89, SOT23, SOT25 and
SOP
Description
The AP431/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 0.2. 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 AP431/431A 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 1 X X X X
Package
Packing
Blank : Tube or bulk
A : Taping
Reference Voltage
Tolerance:
Blank : +/- 1%
A : +/- 0.5%
Operating Temperature Range
Blank : SOP-8L
Y : SOT89-3L
V : TO92-3L
W : SOT23-3L
R : SOT23-3L
Q : SOT25
Blank : -20
o
C~85
o
C
I : -40
o
C~85
o
C
Typical Application Circuit
+
+
R2
R1
V
OUT
V
IN
V
OUT
= (1+R1/R2)V
REF
Precision Regulator
C
in
C
out
AP431
Adjustable Precision Shunt Regulator
AP431/AP431A
Anachip Corp.
www.anachip.com.tw
Rev. A5 May.23, 2003
2/16
ATC
Block Diagram
REF (R)
V
REF
+
-
Anode (A)
Cathode (C)
Symbol
Cathode (C)
REF (R)
Anode (A)
Pin Configuration
Order Number
Pin Configuration (Top View)
AP431Y
AP431 AY
AP431IY
AP431IAY
(SOT89)
AP431V
AP431 AV
AP431IV
AP431IAV
(TO92)
Order Number
AP431R
AP431AR
AP431IR
AP431IAR
(SOT23)
AP431W
AP431AW
AP431IW
AP431IAW
(SOT23)
1 REF
2 Anode
3 Cathode
1 REF
2 Anode
+
+
+
3 Cathode
Anode 1
2 Cathode
3 REF
Anode 1
2 REF
3 Cathode
Cathode 1
Anode 2
Anode 3
NC 4
5 NC
6 Anode
7 Anode
8 REF
AP431
AP431A
AP431I
AP431IA
(SOP)
Pin Configuration (Top View)
AP431 Q
AP431 AQ
AP431IQ
AP431IAQ
(SOT25)
NC 1
4 REF
NC 2
Cathode 3
5 Anode
Adjustable Precision Shunt Regulator
AP431/AP431A
Anachip Corp.
www.anachip.com.tw
Rev. A5 May.23, 2003
3/16
ATC
Marking Information
(1) SOT23 / SOT25 / SOT89
P/N Type
:
X X
AP431Y
:
A 4
AP431AY
:
A 5
AP431IY
:
A A
AP431IAY
:
A B
AP431W
:
A 6
AP431AW
:
A 7
AP431IW
:
A C
AP431IAW
:
A D
AP431R
:
A 8
AP431AR
:
A 9
AP431IR
:
A E
AP431IAR
:
A F
AP431Q
:
A 2
AP431AQ
:
A 3
AP431IQ
:
A G
AP431IAQ
:
A H
XX YM
SOT23/SOT25
XX
YM
SOT89
Date code
Y : Year
M : Month
XX: P/N Type
(Top View)
(2) SOP
Accuracy
ATC
AP431X X
YYWW
Blank:
A :
Logo
( Top view )
%
1
495
.
2
%
5
.
0
495
.
2
Blank: -20
o
C ~ +85
o
C
I : -40
o
C ~ +85
o
C
YY : Year
WW: Nth week
Date code
Temp. grade
(3)TO92
Accuracy
AP431X
X YWW X X
Blank:
A :
( Top view )
Y : Year
WW: Nth week
Date code
Internal code
Temp. grade
XX:
X :
%
1
495
.
2
%
5
.
0
495
.
2
%
1
495
.
2
%
5
.
0
495
.
2
Blank: -20
o
C ~ +85
o
C
I : -40
o
C ~ +85
o
C
Adjustable Precision Shunt Regulator
AP431/AP431A
Anachip Corp.
www.anachip.com.tw
Rev. A5 May.23, 2003
4/16
ATC
Absolute Maximum Ratings
Cathode Voltage .........................................................................................................................36V
Continuous Cathode Current ....................................................................................... -10mA ~ 250mA
Reference Input Current Range ................................................................................................... 10mA
Operating Temperature Range (AP431).............................................................................. -20
o
C ~ 85
o
C
(AP431I).............................................................................. -40
o
C ~ 85
o
C
Lead Temperature................................................................................................................... 260
o
C
Storage Temperature .................................................................................................... -65
o
C ~ 150
o
C
Power Dissipation (Notes 1. 2) SOT89 Package .................................................................. 0. 80W
TO92 Package .................................................................. 0.78W
SOT23 package .................................................................. 0.23W
SOT25 Package...................................................................0.23W
SOP Package................................................................... 0.6W
Note 1: TJ, max =150
o
C
Note 2: Ratings apply to ambient temperature at 25
o
C
Electrical Characteristics
(Ta=25
o
C , unless otherwise specified.)
PARAMETER
TEST CONDITIONS
SYMBOL MIN. TYP. MAX. UNIT
AP431
2.470 2.495 2.520
Reference voltage
V
KA
= V
REF
,
I
KA
= 10mA
(Fig.1)
AP431A
V
REF
2.482
2.507
V
Deviation of Reference input voltage
over temperature (Note 3)
V
KA
= V
REF
, I
KA
= 10mA,
Ta = Full range (Fig.1)
V
REF
8.0
20
mV
V
KA
= 10V ~V
REF
V
REF
-1.4
-2.0 mV/V
Ratio of the change in Reference
voltage to the change in Cathode
voltage
I
KA
= 10mA
(Fig.2)
V
KA
= 36V ~10V
V
KA
-1
-2
mV/V
Reference input current
R1 = 10K,R2 = I
KA
= 10mA
(Fig.2)
I
REF
1.4
3.5
A
Deviation of Reference input current
over temperature
R1 = 10K,R2 = I
KA
= 10mA
Ta = Full range (Fig.2)
I
REF
0.4
1.2
A
Minimum Cathode current for
regulation
V
KA
= V
REF
(Fig.1)
I
KA(MIN)
0.19
0.5
mA
Off-state current
V
KA
= 36V, V
REF
= 0V (Fig.3)
I
KA(OFF)
0.1
1.0
A
Dynamic output impedance (Note 4)
V
KA
= V
REF
V
KA
= V
REF
I
KA
= 0.1mA ~ 15mA
Frequency
1KHz (Fig.1)
KA
Z
0.2
0.5
V
MAX
V
MIN
T
I
T
2
TEMPERATURE
V
DEV
= V
MAX
- V
MIN
Adjustable Precision Shunt Regulator
AP431/AP431A
Anachip Corp.
www.anachip.com.tw
Rev. A5 May.23, 2003
5/16
ATC
Note 3. 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 V
REF
is defined as:
1
2
6
10
)
)
25
(
(
T
T
C
V
V
V
REF
DEV
REF
-
=
.............................................. (
)
C
ppm
Where:
T2 T1 = full temperature change.
V
REF
can be positive or negative depending on whether the slope is positive or negative.
Note 4. The dynamic output impedance, R
Z
, is defined as:
KA
KA
KA
I
V
Z
=
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:
)
2
1
+
1
(
=
'
R
R
Z
i
v
Z
KA
KA
Test Circuits
Input
V
REF
V
KA
I
KA
Fig1. Test Circuit for V
KA
= V
REF
IN
V
REF
R1
R2
I
REF
Note:V
KA
=V
REF
(1+R1/R2)+I
REF
R1
I
KA
V
KA
Fig2. Test circuit for V
KA
> V
REF
IN
V
KA
I
Z(OFF)
Fig3. Test Circuit for off-state Current
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