Advanced Power
Electronics Corp.
AP431A
ADJUSTABLE PRECISION SHUNT
REGULATOR
Features
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Description
The 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 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.
Precision reference voltage
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: TO-92,SOT-23, SOT-25 and SOP-8
SOT-89
RoHS Compliant
& Halogen Free Product
Ordering Information
A
P
4
3
1
A
X
-
X
Package
T : TO-92
N/NR : SOT-23
Y : SOT-25
M : SOP-8
G: SOT-89
Reference Voltage
Tolerance :
A : +/- 0.5%
B : +/- 1%
Typical Application Circuit
V
IN
V
OUT
+
C
in
AP431A
AP431
R1
+
C
out
R2
V
OUT
= (1+R1/R2)V
REF
Precision Regulator
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Advanced Power
Electronics Corp.
Block Diagram
REF (R)
+
Cathode (C)
-
V
REF
AP431A
Symbol
Cathode (C)
REF (R)
Anode (A)
Anode (A)
Pin Configuration
Order Number
Pin Configuration ( Top View )
Order Number
Pin Configuration ( Top View )
AP431AT
( TO-92 )
Rthja=160
o
C/W
Rthjl=60
o
C/W
3
2
1
Cathode
Anode
REF
AP431AN
( SOT-23
)
Rthja=500
o
C/W
Rthjc=180
o
C/W
2
Anode
3
1
Cathode
Cathode
REF
Cathode
AP431AM
( SO-8 )
Rthja=208 C/W
Rthjc=50
o
C/W
o
1
2
3
4
8
7
6
5
REF
Anode
Anode
NC
NC
1
Anode
Anode
NC
AP431AY
( SOT-23-5L
)
Rthja=500
o
C/W
Rthjc=180
o
C/W
5
Anode
NC
Cathode
1
2
4
3
REF
3
Cathode
Anode
REF
1
AP431AG
( SOT-89 )
Rthja=250
o
C/W
Rthjc=110
o
C/W
2
1
2
AP431AY5
( SOT-23-5L
)
Rthja=500
o
C/W
Rthjc=180
o
C/W
5
NC
Anode
Cathode
1
2
4
3
NC
REF
AP431ANR
( SOT-23
)
Rthja=500 C/W
Rthjc=180
o
C/W
o
2
Anode
3
1
REF
Cathode
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Electronics Corp.
Absolute Maximum Ratings
AP431A
Cathode Voltage ………………………………......….........................…...……………………………...……….36V
Continuous Cathode Current ………………………….…….............…................…………….... -10mA ~ 250mA
Reference Input Current Range ……………..………..............…….................................………….…....... 10mA
o
o
Operating Temperature Range ………….…………..…….…….....………………...........………......-40 C ~ 85 C
o
Lead Temperature………………………….………….…….…………....…………………….........…............ 260 C
o
o
Storage Temperature ……………………………......…....….............………………..……...…....... -65 C ~ 150 C
Power Dissipation (Notes 1. 2)
TO-92 Package ….…………..………………………....………….....… 0.78W
SOT-23 Package .…...…………..…………….......…………………… 0.25W
SOT-25 Package……………………...…………….………….………..0.25W
SOP-8 Package……………….………………………………………… 0.6W
o
SOP-89 Package............................................................................... 0.5W
Note 1: TJ, max =150 C
o
Note 2: Ratings apply to ambient temperature at 25 C
Electrical Characteristics
(Ta=25
o
C , unless otherwise specified.)
PARAMETER
TEST CONDITIONS
SYMBOL MIN.
TYP. MAX. UNIT
V
KA
= V
REF
,
-B
I
KA
= 10mA
(Fig.1)
-A
Deviation of Reference input voltage V
KA
= V
REF
, I
KA
= 10mA,
over temperature (Note 3)
Ta = Full range (Fig.1)
Ratio of the change in Reference
V
KA
= 10V
voltage to the change in Cathode
I
KA
= 10mA
(Fig.2)
~V
REF
voltage
V
KA
= 36V ~10V
R1 = 10KΩ,R2 =
∞
I
KA
= 10mA
Reference input current
(Fig.2)
Deviation of Reference input current R1 = 10KΩ,R2 =
∞
I
KA
= 10mA
over temperature
Ta = Full range (Fig.2)
Minimum Cathode current for
V
KA
= V
REF
(Fig.1)
regulation
Off-state current
V
KA
= 36V, V
REF
= 0V (Fig.3)
V
KA
= V
REF
Dynamic output impedance (Note 4)
Frequency
≤
1KHz (Fig.1)
Reference voltage
V
MAX
V
DEV
= V
MAX
- V
MIN
V
MIN
V
REF
V
REF
∆V
REF
∆V
KA
I
REF
αI
REF
I
KA(MIN)
I
KA(OFF)
2.470 2.495 2.520
2.482
2.507
8.0
-1.4
-1
1.4
0.4
0.19
0.1
0.2
20
V
mV
-2.0 mV/V
-2
3.5
1.2
0.5
1.0
0.5
mV/V
µA
µA
mA
µA
Ω
Z
KA
T
I
TEMPERATURE
T
2
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Electronics Corp.
AP431A
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
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
REF×
R1
Fig1. Test Circuit for V
KA
= V
REF
Fig2. Test circuit for V
KA
＞V
REF
Fig3. Test Circuit for off-state Current
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Electronics Corp.
Typical Performance Characteristics
Cathode current Vs Cathode Voltage
100
V
KA
=Vref
Ta=25
o
C
Cathode current(uA)
600
V
KA
=Vref
Ta=25
o
C
AP431A
Cathode current (uA) Vs Cathode Voltage
Cathode current(mA)
400
0
200
0
-100
-1.5
0.5
-0.5
Cathode Voltage(v)
1.5
2.5
-200
-1
-0.5
0
0.5
1.5
1
Cathode Voltage(v)
2
2.5
Reference Voltage Vs Free-Air Temperature
2500
Reference Voltage(mV)
2495
2490
2485
2480
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Free-Air Tempeture (
o
C)
Reference input current Vs free Temperature
Reference input current (uA)
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
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