Voltage Regulators
AN1431T, AN1431M
Variable output shunt regulator
I
Overview
The AN1431T and AN1431M are highly accurate
stabilized power supplies in which the output voltage can
be adjusted in the range from approximately 2.5 to 36V
under the operating temperature by using the external re-
sistor. Because of its fast rising characteristic, it can be used
as a Zener diode and has the wide application.
AN1431T
5.0±0.2
Unit: mm
4.0±0.2
M
ain
Di
sc te
on na
tin nc
ue e/
d
0.6±0.15
(1.0)
5.1±0.2
2.3±0.2
(1.0)
I
Features
•
High precision reference voltage: 2.5V (allowance:
±2%)
•
High temperature stability: 17ppm/°C typ.
•
Output voltage externally adjustable: 2.5 to 36V
•
Fast rising output
•
Low input impedance: 0.2Ω typ.
•
Low output noise voltage
I
Block Diagram
(AN1431T)
Current
Source
Error
Amp.
isc
1
(3)
I
K
3
(2)
2
(1)
I
REF
on
tin
ue
−
Voltage
Reference
R
V
KA
=
V
REF
(1
+
1
)
+
I
REF
· R
1
R
2
R
2
=
2.5kΩ
0.48 max.
0.58 max.
1.5
0.8 min.
Output Tr
+
R
2
ce
R
1
V
REF
/D
V
1
V
KA
Note) The number in ( ) shows the pin number for the AN1431M.
I
Pin Descriptions
•
AN1431T
Pin No.
1
2
3
Cathode
Reference pin
Anode
Description
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0.43
+0.1
–0.05
0.43
+0.1
–0.05
2.54
2 3 1
SSIP003-P-0000
AN1431M
13.5±0.5
Unit: mm
1.6 max.
4.6 max.
1.8 max.
2.6 typ.
4.25 max.
2.6 max.
0.44 max.
1.5
3.0
3
2
1
HSIP003-P-0000B
Ma
int
en
Note) The packages (SSIP003-P-0000 and HSIP003-
P-0000B) of this product will be changed to
lead-free type (SSIP003-P-0000S and HSIP003-
P-0000Q). See the new package dimensions
section later of this datasheet.
an
•
AN1431M
Pin No.
1
2
3
Anode
Cathode
Description
Reference pin
Publication date: December 2001
SFF00001CEB
1
AN1431T, AN1431M
I
Absolute Maximum Ratings at T
a
=
25°C
Parameter
Supply voltage
Supply current
Power dissipation
Reference input current
Operating ambient temperature
Storage temperature
AN1431T
AN1431M
AN1431T
AN1431M
Symbol
V
CC
I
CC
P
D
I
REF
T
opr
T
stg
Rating
37
−100
to
+150
650 *
−
0.05 to
+10
−20
to
+85
−25
to
+80
−55
to
+150
−55
to
+125
Unit
V
mA
mW
mA
°C
°C
Parameter
Symbol
V
KA
Supply voltage
I
Electrical Characteristics at T
a
=
25°C
Parameter
Symbol
V
REF
Reference voltage
Reference voltage change to temperature
V
REF(Jev)
*
1, 2
Reference voltage power supply characteristic
Reference input current
∆V
REF
∆V
KA
I
REF
Reference input current change to temperature
Minimum cathode current
Off-state cathode current
I
REF(dev)
*
2
I
min
Dynamic impedance
V
REF
Z
KA
*
3
tin
*1
V
REF(dev)
=
V
REF(max)
−
V
REF(min)
V
REF(max)
Ma
int
en
V
REF(min)
∆T
a
The temperature coefficient aV
REF
for the reference input voltage is equivalently given by the following expression.
V
REF(dev)
†
aV
REF
=
V
REF
×
10
6
(ppm/°C) † V
REF
at T
a
=
25°C
∆T
a
For example, assuming V
REF(max)
=
2500mV (T
a
=
30°C), V
REF(min)
=
2497mV (T
a
=
0°C), (V
REF(dev)
=
3mV) and
V
REF
=
2499mV (T
a
=
25°C)
∆T
a
=
70°C
3mV
then,
aV
REF
=
2499mV
×
10
6
=
17.1 (ppm/°C)
70°C
*2 These values are design reference values, not guaranteed ones.
*3 The dynamic impedance is defined by the following expression.
Z
KA
=
∆V
KA
∆I
K
The total dynamic impedance at
∆V
REF
,
∆V
KA
, I
REF
and I
REF(dev)
is as follows.
∆V
R
Z =
= Z
KA
(1
+
1
)
∆I
R
2
SFF00001CEB
2
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co L a d t ty
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life
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.
Range
V
REF
(2.5 to 36V)
Conditions
Min
Typ
Max
Unit
V
KA
=
V
REF
, I
K
=
10mA
V
KA
=
V
REF
, I
K
=
10mA,
T
a
=
0 to
+70°C
2.45
2.50
3
2.55
17
I
K
=
10mA,
∆V
KA
=
10V to V
REF
−1.2
−1
2
−2.7
I
K
=
10mA,
∆V
KA
=
36V to 10V
I
K
=
10mA, R
1
=
10kΩ, R
2
= ∞
I
K
=
10mA, R
1
=
10kΩ, R
2
= ∞,
T
a
=
0 to
+70°C
−2
4
0.4
1.2
1.0
V
KA
=
V
REF
0.4
I
OFF
V
KA
=
36V, V
REF
=
0V
V
KA
=
V
REF
, I
K
=
1 to 100mA,
f
≤
1kHz
I
REF
I
REF(max)
M
ain
Di
sc te
on na
tin nc
ue e/
d
*
AN1431M is mounted on a standard board (glass epoxy: 20mm
×
20mm
×
t1.7mm with Cu foil of 1cm
2
or more).
g
g
I
Recommended
p
Operating Range at T
a
=
25°C
V
mV
mV/V
µA
µA
µA
Ω
mV/V
mA
0.1
1.0
0.5
0.2
ue
I
REF(dev)
=
I
REF(max)
−
I
REF(min)
/D
isc
on
an
ce
V
REF(dev)
I
REF(dev)
I
REF(min)
∆T
a
Request for your special attention and precautions in using the technical information and
semiconductors described in this book
(1)
If any of the products or technical information described in this book is to be exported or provided to non-residents, the laws and
regulations of the exporting country, especially, those with regard to security export control, must be observed.
(2) The technical information described in this book is intended only to show the main characteristics and application circuit examples
of the products, and no license is granted under any intellectual property right or other right owned by our company or any other
company. Therefore, no responsibility is assumed by our company as to the infringement upon any such right owned by any other
company which may arise as a result of the use of technical information described in this book.
(3) The products described in this book are intended to be used for standard applications or general electronic equipment (such as office
equipment, communications equipment, measuring instruments and household appliances).
Consult our sales staff in advance for information on the following applications:
–
Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support
systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the prod-
ucts may directly jeopardize life or harm the human body.
–
Any applications other than the standard applications intended.
(4) The products and product specifications described in this book are subject to change without notice for modification and/or im-
provement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product
Standards in advance to make sure that the latest specifications satisfy your requirements.
(5) When designing your equipment, comply with the range of absolute maximum rating and the guaranteed operating conditions
(operating power supply voltage and operating environment etc.). Especially, please be careful not to exceed the range of absolute
maximum rating on the transient state, such as power-on, power-off and mode-switching. Otherwise, we will not be liable for any
defect which may arise later in your equipment.
Even when the products are used within the guaranteed values, take into the consideration of incidence of break down and failure
mode, possible to occur to semiconductor products. Measures on the systems such as redundant design, arresting the spread of fire
or preventing glitch are recommended in order to prevent physical injury, fire, social damages, for example, by using the products.
(6) Comply with the instructions for use in order to prevent breakdown and characteristics change due to external factors (ESD, EOS,
thermal stress and mechanical stress) at the time of handling, mounting or at customer's process. When using products for which
damp-proof packing is required, satisfy the conditions, such as shelf life and the elapsed time since first opening the packages.
(7) This book may be not reprinted or reproduced whether wholly or partially, without the prior written permission of Matsushita
Electric Industrial Co., Ltd.
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n.p bo yp pe
ct
life
an ut e
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as lat
cy
on es
cle
ic. t in
sta
co fo
ge
.jp rm
.
/en at
/ ion
.
Ma
int
en
an
ce
M
ain
Di
sc te
on na
tin nc
ue e/
d
/D
isc
on
tin
ue
di
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