AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Features
•
Precision reference voltage
AP431 : 2.495V
±
1%
AP431A : 2.495V
±
0.5%
Sink current capability: 200mA
Minimum cathode current for regulation: 300µA
o
Equivalent full-range temp coefficient: 30 ppm/ C
Fast turn-on response
Low dynamic output impedance: 0.2Ω
Programmable output voltage to 36V
Low output noise
Packages: TO92-3L, SOT89-3L, SOP-8L, SOT23,
SOT25, SC-59
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.
The precise (+/-) 1% Reference voltage tolerance of the
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.
•
•
•
•
•
•
•
•
Ordering Information
A
P
4
3
1
X
X
X
X
Reference Voltage
Tolerance:
Blank : +/- 1%
A
: +/- 0.5%
Package
Blank :
Y
:
V
:
SA
:
W
:
R
:
Q
:
SO P-8L
SO T89-3L
TO 92-3L
SO T23
SC59
SC59
SO T25
Lead-Free
Blank : Standard
L
: Lead-Free
G
: G reen
(Note1)
-U
-B
-7/-13
-A
Packing
:
:
:
:
Tube
Bulk
Taping
Am m o Box
Note:
1. Only for SOT23 and SC59
Device
(Note 2)
AP431(A)SA
AP431(A)Q
AP431(A)W
AP431(A)R
AP431(A)
AP431(A)Y
AP431(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 AP431A 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.
AP431/AP431A Rev. 1
1 of 13
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©
Diodes Incorporated
AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Typical Application Circuit
V
IN
V
OUT
+
C
in
AP431
R1
+
C
out
R2
V
OUT
= (1+R1/R2)V
REF
Precision Regulator
Typical Application Circuit
Typical Application Circuit
REF (R)
+
Cathode (C)
-
V
REF
Cathode (C)
REF (R)
Anode (A)
Anode (A)
AP431/AP431A Rev. 1
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2006
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Diodes Incorporated
AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Pin Configuration
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 ……………………………......…..............................……………...…...............…..……………….…….……...……….36V
Continuous Cathode Current ………………………….……...............................…………...........……………………….... -10mA ~ 250mA
Reference Input Current Range ……………..………..............……...............................……........……………….……..………........ 10mA
Operating Temperature Range …………..…….…….....………………...........…..........……………….…………......-20°C ~ 85°C
Lead Temperature………………………….……..….…….…………....…………………….............………………..….…...…............ 260°C
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.
Note 5.
T
J
, max =150°C
Ratings apply to ambient temperature at 25°C
AP431/AP431A Rev. 1
+
+
TO92-3L
+
3 of 13
AUGUST
2006
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©
Diodes Incorporated
AP431/AP431A
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 )
TEST CONDITIONS
AP431
V
KA
= V
REF
,
AP431A
I
KA
= 10mA (Fig.1)
V
KA
= V
REF
, I
KA
= 10mA,
Ta = Full range (Fig.1)
V
KA
= 10V ~V
REF
I
KA
= 10mA (Fig.2)
V
KA
= 36V ~10V
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
= 36V, V
REF
= 0V (Fig.3)
V
KA
= V
REF
V
KA
= V
REF
∆I
KA
= 0.1mA ~ 15Ma
Frequency
≤
1KHz (Fig.1)
SYMBOL MIN.
V
REF
V
REF
∆V
REF
∆V
KA
I
REF
αI
REF
I
KA(MIN)
I
KA(OFF)
|Z
KA
|
2.470
2.482
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
TYP. MAX. UNIT
2.495
8.0
-1.4
-1
1.4
0.4
0.19
0.1
0.2
2.520
2.507
20
-2.0
-2
3.5
1.2
0.5
1.0
0.5
V
mV
mV/V
mV/V
µA
µA
mA
µA
Ω
V
MAX
V
DEV
= V
MAX
- V
MIN
V
MIN
T
I
Temperature
T
2
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:
α
V
REF
V
DEV
)
⋅
10
6
V (25
°
C)
……………………..……………….. (
ppm
)
=
REF
°
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
AP431/AP431A Rev. 1
4 of 13
AUGUST
2006
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©
Diodes Incorporated
AP431/AP431A
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
AP431/AP431A Rev. 1
5 of 13
AUGUST
2006
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©
Diodes Incorporated
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