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: SOT23, SOT23R, SOT25, SOT89-3L, SC59,
SC59R, SOP-8L and TO92-3L
Lead Free packages: SOT25, SOT89-3L, SC59,
SC59R and TO92-3L
SOP-8L, SOT23, SOT23R, SC59, SC59R: Available in
“Green” Molding Compound (No Br, Sb) (Note 2)
Lead Free Finish/ RoHS Compliant (Note 3)
General 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.
•
•
•
•
•
•
•
•
•
•
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Ordering Information
AP431 X XX X X
Reference Voltage
Tolerance
Blank : +/- 1%
A : +/- 0.5%
Package
SA : SOT23
SR : SOT23R
Q : SOT25
W : SC59
R : SC59R
Blank : SOP-8L
Y : SOT89-3L
V : TO92-3L
Lead Free
L : Lead Free (Note 1)
G : Green (Note 2)
Packing
-U : Tube
-7/ 13 : Tape & Reel
-A : Ammo Box (Note 4)
Device
(Note 5)
AP431(A)SA
AP431(A)SR
AP431(A)Q
Lead-free
7” Tape and Reel
Package Packaging
Part Number
Code
(Note 3, 6) Quantity
Suffix
SA
SR
Q
W
R
SOT23
SOT23R
SOT25
SC59
SC59R
SOP-8L
Y
V
SOT89-3L
TO92-3L
3000/Tape
& Reel
3000/Tape
& Reel
3000/Tape
& Reel
3000/Tape
& Reel
3000/Tape
& Reel
NA
NA
NA
-7
-7
-7
-7
-7
NA
NA
NA
13” Tape and Reel
Part Number
Quantity
Suffix
NA
NA
NA
NA
NA
2500/Tape
& Reel
2500/Tape
& Reel
NA
NA
NA
NA
NA
NA
-13
-13
NA
Ammo Box
Part Number
Quantity
Suffix
NA
NA
NA
NA
NA
NA
NA
2000/Box
NA
NA
NA
NA
NA
NA
NA
-A
AP431(A)W
AP431(A)R
AP431(A)
AP431(A)Y
Lead-free
Lead-free
AP431(A)V
Notes:
1. SOT25, SOT89-3L and TO92-3L are “Lead Free” products only.
2. SOP-8L, SOT23 and SOT23R are available in “Green” product only.
3. RoHS revision 13.2.2003. Glass and high temperature solder exemptions applied, see
EU Directive Annex Notes 5 and 7
4. Ammo Box is for TO92-3L Spread Lead.
5. Suffix “A” denotes AP431A device.
6. 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. 10
1 of 16
APRIL 2008
www.diodes.com
©
Diodes Incorporated
AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Electrical Characteristics
Symbol
V
REF
V
REF
ΔV
REF
ΔV
KA
I
REF
αI
REF
I
KA(MIN)
I
KA(OFF)
|Z
KA
|
Parameter
Reference voltage
(T
A
= 25
o
C, V
+
= +5.0V, unless otherwise stated)
Test Conditions
AP431
V
KA
= V
REF
,
I
KA
= 10mA (Fig.1) AP431A
V
KA
= V
REF
, I
KA
= 10mA,
Ta = Full range (Fig.1)
V
KA
= V
REF
to10V
I
KA
= 10mA (Fig. 2)
V
KA
= 10V to 36V
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
ΔI
KA
= 0.1mA ~ 15mA
Frequency
≤
1KHz (Fig.1)
Min Typ. Max Unit
2.470
2.520
2.495
V
2.482
2.507
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
8.0
-1.4
-1
1.4
0.4
0.19
0.1
0.2
20
mV
Deviation of Reference input
voltage over temperature
(Note 9)
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 10)
-2.0 mV/V
-2
3.5
1.2
0.5
1.0
0.5
mV/V
μA
μA
mA
μA
Ω
V
MAX
V
DEV
= V
MAX
- V
MIN
V
MIN
T
I
Temperature
T
2
Notes:
9. 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)
=
REF
T
2
−
T
1
(
……………………..………..…………….. (
ppm
°
C
)
Where:
T2 – T1 = full temperature change.
αV
REF
can be positive or negative depending on whether the slope is positive or negative.
Notes:
10. The dynamic output impedance, R
Z
, is defined as:
Z
KA
=
Δ
V
KA
Δ
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
=
'
Δ
v
≈
Z
KA
Δ
i
(1
+
R1
)
R2
5 of 16
APRIL 2008
AP431/AP431A Rev. 10
www.diodes.com
©
Diodes Incorporated
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