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
TM
Packages: SOT-23 and SC-59. SOT-25, PowerDI 5,
SOP-8L, and DFN under development
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 A X X X
Reference Voltage
Tolerance:
Blank : +/- 1%
A
: +/- 0.5%
Packing
Package
Lead-Free
SA
: SOT23
F : Lead-Free Blank : Tube or bulk
SB
: SOT25
-7/-13 : Taping
G : Green
SN
: SC-59
PB
: PowerDI™5
SM
: SOP-8L
FB
: DFN
Device
(Note 1)
AP431(A)SA
AP431(A)SB
AP431(A)SN
AP431(A)PB
AP431(A)SM
AP431(A)FB
Package Packaging
Code
(Note 2)
SA
SB
SN
PB
SM
FB
SOT-23
SOT-25
SC-59
PowerDI™5
SOP-8L
DFN
7” Tape and Reel
Quantity
Part
Number
Suffix
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
NA
3000/Tape & Reel
3000/Tape & Reel
-7
-7
-7
NA
-7
-7
13” Tape and Reel
Quantity
Part
Number
Suffix
10,000/Tape & Reel
10,000/Tape & Reel
10,000/Tape & Reel
5000/Tape & Reel
10,000/Tape & Reel
10,000/Tape & Reel
-13
-13
-13
-13
-13
-13
Typical Application Circuit
V
IN
V
OUT
+
C
in
DP431
R1
+
C
out
R2
V
OUT
= (1+R1/R2)V
REF
Precision Regulator
Notes: 1. Suffix “A” denotes AP431A device.
2. 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.
DS30714 Rev. 2 - 2
1 of 12
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AP431/AP431A
©
Diodes Incorporated
AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Block Diagram
Symbol
Cathode (C)
REF (R)
+
Cathode (C)
-
V
REF
REF (R)
Anode (A)
Anode (A)
Pin Configuration
Package
Pin Configuration (Top View)
NC 1
SOT25
NC 2
4 REF
CATHODE 3
Package
Pin Configuration (Top View)
5 ANODE
SC-59
3 REF
ANODE 1
2 CATHODE
CATHODE
3 CATHODE
PowerDI™5
ANODE 1
2 REF
SOP-8L
ANODE
ANODE
NC
1
2
3
4
8
7
6
5
REF
ANODE
ANODE
NC
3 REF
DFN
ANODE 1
3 CATHODE
2 REF
SOT23
ANODE 1
2 CATHODE
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AP431/AP431A
©
Diodes Incorporated
AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Absolute Maximum Ratings
Cathode Voltage ……………………………......…..............................……………...…...............…..……………….………...……….36V
Continuous Cathode Current ………………………….……...............................…………...........…………………….... -10mA ~ 250mA
Reference Input Current Range ……………..………..............……...............................……........……………….…..………........ 10mA
Operating Temperature Range (AP431)…………..…….…….....………………...........…..........……………….…….…......-20°C ~ 85°C
Lead Temperature………………………….……..….…….…………....…………………….............………………..….....…............ 260°C
Storage Temperature ……………………………......…....…..........………………..…..........….…...………………...…..... -65°C ~ 150°C
Power Dissipation (Notes 3, 4)
SOT-25 Package .………….....…………………….....…....………………...…......…........ 250mW
PowerDI™5 Package ….…………..………................….........………………..…..........… 900mW
SC-59 Package......................................................................………………....…............ 400mW
SOP-8L Package ……………..…………….......…………………………………....…....…. 600mW
DFN Package....................................................................…………………..………........ 250mW
Note 3.
Note 4.
T
J
, max =150°C
Ratings apply to ambient temperature at 25°C
Electrical Characteristics
(T
A
=25
o
C, V
+
=+5.0V, unless otherwise stated)
PARAMETER
Reference voltage
Deviation of Reference input voltage over
temperature (Note 3)
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 4)
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
DS30714 Rev. 2 - 2
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AP431/AP431A
©
Diodes Incorporated
AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Electrical Characteristics (Continued)
(T
A
=25
o
C, V
+
=+5.0V, unless otherwise stated)
(Note 5)
Note 5.
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 4. 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 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
DS30714 Rev. 2 - 2
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©
Diodes Incorporated
AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Typical Performance Characteristics
Cathode Current vs Cathode Voltage
100
V
KA
=V
ref
Ta=25
o
C
Cathode Current (uA)
600
V
KA
=V
ref
Ta=25
o
C
Cathode Current (uA) vs Cathode Voltage
Cathode Current (mA)
400
0
200
0
-100
-1.5
0.5
-0.5
1.5
Cathode Voltage (v)
2.5
-200
-1
-0.5
0
0.5
1.5
1
Cathode Voltage(v)
2
2.5
Reference Voltage vs Free-Air Temperature
Reference Input Current (uA)
2500
Reference Voltage (mV)
2495
2490
2485
2480
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Free-Air Temperature (
o
C)
Reference Input Current vs Free Temperature
2
1.8
1.6
1.4
1.2
1
-50
R1=10K
I
KA
=10mA
-25
0
25
50
75
o
C)
Free-Air Temperature (
100
125
Change in Reference Voltage vs Cathode Voltage
Change in Reference Voltage (mv)
0
-2
-4
-6
-8
-10
-12
0
5
10
15
20
Cathode Voltage (V)
25
30
I
KA
=10mA
Ta=25
o
C
DS30714 Rev. 2 - 2
5 of 12
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AP431/AP431A
©
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