Datasheet AN1431T, AN1431M Datasheet (Panasonic)

■ Overview

The AN1431T and AN1431M are high accuracy stabilized
power supplies in which the output voltage can be adjusted in
the range from approx. 2.5 to 36V by using the external resistor
under the operating temperature. Because of its fast rise charac­teristics, it can be replaced with Zener diode and has the wide
application range.

■ Features

•

High precision reference voltage : 2.5V±2%

•

High-temperature stability : 17ppm/˚C typ.

•

Output voltage externally adjustable : 2.5 to 36V

•

Fast rise

•

Low input impedance : 0.2Ω (typ.)

•

Low output noise voltage

AN1431T, AN1431M

Surface-mount Adjustable Output Shunt Regulator

Unit : mmAN1431T

JEDEC : TO-92 (SSIP003-P-0000)

5.0±0.2

5.1±0.213.5±0.5

0.45

2.3±0.2

2.54

321

+0.2
– 0.1

4.0±0.2

■ Block Diagram

Unit : mmAN1431M

JEDEC : TO-92 (SSIP003-P-0000)

5.0±0.2

5.1±0.213.5±0.5

0.45

2.3±0.2

2.54

321

+0.2
– 0.1

4.0±0.2

■ Pin Name

〈AN1431T〉

Pin No.

Pin name
1
2
3

Cathode
Reference pin
Anode

〈AN1431M〉

Pin No.

Pin name
1
2
3

Reference pin
Anode
Cathode

Output Tr

3 2 1

V

1

Current
Source

1

I

K

+

Error
Amp.

–

3 2

R

Voltage
Reference

1

R

2

R

V

= V

KA

REF

1

(1 + ) + I

R

2

REF

· R

1

R2 = 2.5kΩ

I

REF

V

KA

V

REF

Pin number in is for the AN1431T.
Pin number in is for the AN1431M.

V

CC

I

CC

P

D

I

REF

V

opr

T

stg

V

mA

mW

mA

˚C

˚C

■ Absolute Maximum Ratings (Ta=25˚C)

37

–100 to+150

650

*

– 0.05 to+10

–20 to+85

–25 to+80
–55 to+150
–55 to+125

Supply voltage
Supply current
Power dissipation
Reference input current

Operating ambient
temperature

Storage temperature

AN1431T
AN1431M
AN1431T
AN1431M

* For the AN1431M, SM to the printed board (glass epoxy of 20 × 20 × 1.7mm with copper film of 1cm2)

Parameter Symbol Rating Unit

Parameter Symbol Range

■ Recommended Operating Range (Ta=25˚C)

Operating supply voltage range

V

KA

V

REF

(2.5 to 36V)

Reference voltage

V

REF

2.55 V2.50

V

KA=VREF

, IK=10mA

VKA=V

REF

, IK=10mA,

Ta=0 to+70˚C

Reference voltage fluctuation

∆V

REF

–2.7 mV/V–1.2

I

K

=10mA, DVKA=10V to V

REF

∆V

KA

mV/V

I

K

=10mA, DVKA=36 to 10V

Reference input current

I

REF

µA2

I

K

=10mA, R1=10kΩ, R2= ∞

µA

I

K

=10mA, R1=10kΩ, R2= ∞,

Ta=0 to+70˚C

Reference input current temperature deviation

I

REF (Jev)

*

2

mA0.4

V

KA=VREF

–1

Minimum cathode current

I

min

µA0.1

V

KA

=36V, V

REF

=0V

Off-state cathode current

I

OFF

Ω

Dynamic impedance

|ZKA|

*

3

VKA=V

REF

, IK=1 to 100mA,

f 1kHz

1.0

0.5

–2

4

1.2

1.0

2.45

Reference voltage temperature deviation

V

REF (Jev)

*

1

*

2

mV3 17

0.4

0.2

Parameter Symbol Condition min typ max Unit

■ Electrical Characteristics (Ta=25˚C)

<

=

V

REF

*1

V

REF (max)

V

REF (min)

V

REF (dev)

= V

REF (max) –VREF (min)

V

REF (dev)

V

REF (max)

=2500mV (Ta=30˚C),

V

REF (min)

=2497mV (Ta=0˚C),

(V

REF (dev)

=3mV),

V

REF

=2499mV (Ta=25˚C)

∆Ta=70˚C

∆Ta

∆Ta

I

REF

I

REF (max)

I

REF (min)

I

REF (dev)

= I

REF (max)

– I

REF (min)

I

REF (dev)

∆Ta

|aV

REF

|= × 106 (ppm/˚C)

V

REF

*

V

REF (dev)

70˚C

|aV

REF

| = × 106=17.1 (ppm/˚C)

|Z

KA

| =

2499mV

∆I

K

∆V

KA

|Z| = = |ZKA| 1 +

∆I

∆V

R

2

R

1

3mV

*

V

REF

at Ta=25˚C

For example, assuming the following ;

Then, the following expression is established.

*2 These values are design reference values, not
guaranteed ones.

*3 The dynamic impedance is defined by the following
expression.

The total dynamic impedance at ∆V

REF

, ∆VKA,

I

REF

, and I

REF (dev)

is as follows.

The temperature coefficient aV

REF

for the reference input

voltage is equivalently given by the following expression.

1000

900

800

700

600

500

400

300

200

100

0

0

20

40

60

80

100

120

140

160

Ambient Temperature Ta (˚C)

Power Dissipation P

D

(mW)

PD – Ta

Mounting onto Substrate :
20 × 20 × 1.7mm Glass Epoxy
Substrate, Copper Foil 1cm

2

or More

■ Power Dissipation

V

O

C

O

C

I

+V

AN1431T/M

1.Shunt Regulator

4.Current Boost

5.Adjustable Output Regulator Combined
with 3-pin Regulator

2.Constant Current Power
Supply

3.Constant Current Source

AN1431T/M

I

O

I

O

V

O

R

1

V

REF

R

2

R

S

R

S

+V

+V

+V

V

O

+V

R

1

V

REF

R

2

R

1

V

REF

R

2

AN1431T/M

AN7805

AN1431T/M

AN1431T/M

V

O

= 1+ V

REF

R

1

R

2

IO =

V

REF

R

S

IO =

V

REF

R

S

VO = 1+ V

REF

R

1

R

2

VO = V

REF

1+ V

O (min)

= V

REF

+ 5V

R

1

R

2

■ Application Circuits

2700

2650

2600

2550

2500

2450

2400

2350

–50 –25 0 25 50 75 100 125

Ambient Temperature Ta (˚C)

Reference Voltage V

REF

(mV)

V

REF

– Ta

VK=V

REF

IK=10mA

4

3

2

1

–40 –20 0 20 40 60 80 100

Ambient Temperature Ta (˚C)

Reference Input Current I

REF

(µA)

I

REF

– Ta

IK=10mA
R

1

=10kΩ

R

2

= ∞

■ Characteristics Curve