BAYLI B431BM, B431AZ, B431AR, B431AM, B431DBR Datasheet

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Bay Linear

Inspire the Linear Power

2.5V Adjustable Shunt Regulator

Description

The Bay Linear B431 is a three terminal adjustable shunt
regulator with thermal stability over Temperature range. Using
two external resistors allows the output voltage to be adjusted
from 2.5V to 36V. With a sharp turn on characteristics the
B431 a superior replacement for zener diode applications.

The B431 shunt regulator has a tolerance of 0.5% which has
proven to be sufficient to overcome all of the other errors in
the system to virtually eliminate the need for trimming in the
power supply manufacturers assembly line and contribute a
significant cost savings.

Features

• Wide Operating Range …1mA to100mA

• Tight Band Gap Tolerance …….… 0.5%

• Low Temp. Coefficient………..30 ppm/

• Wide temp range of –40 to +105

• Available in TO92, SOT-89, SO-8

Applications

• Switching Power Supplies

• Adjustable Power Supplies

• Linear Regulators

• Battery Powered Equipment

• Monitors, TV, VCR

• Instrumentation

Package Information Ordering Information

Ref

TO-92 (Z)

132

Anode

Bottom View

Cat

Package Tolerance

0.5% 1% 1% 2%

TO-92
SOT-89
8SOIC

The Electrical Grade & Type is specified on shipping Box Only

B431AZ B431BZ B431DBZ B431CZ
B431AR B431BR B431DBR B431CR
B431AM B431BM B431DBM B431CM

8-Pin Surface Mount (M)

B431

o

C

o

C

1

2

3

4

Top View

8

7

6

5

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94506 Tel: [phone], Fax: [phone] www.baylinear.com

B431

Absolute Max Ratings

Parameter Symbol Maximum Units

Cathode Voltage Vz 37 V
Continuous Cathode Current Iz 150 mA
Reference Input Current I
Power Dissipation at TA - 25°C
SOT-89
S0-8
TO-92
Thermal Resistance
S0-8
TO-92
SOT-89
Operating Junction Temperature Range TJ -40 to +150
Operating Ambient Temperature T
Storage Temperature Range T

Lead Temperature (Soldering) 10 seconds T
ESD Rating (Human Body Model) T

10 mA

REF

P

D

O

JA

1000

750
775

175
160
110

mW

°C/W

°C

A

-65 to +150

STG

300

LEAD

2 kV

ESD

-40 to +105

°C
°C

°C

Recommended Operating Conditions

Cathode Voltage, Vz V
Cathode Current, Iz 0.1 100 mA

Min Max Symbol

36 V

REF

Electrical Characteristics

Unless specified: T

Parameter Symbol Condition Min Typ Max Units

Reference Voltage V

V

Temp Deviation V

REF

Ratio of Change in

V

To Change in V

REF

Reference Input

Current

I

Temperature

REF

Deviation

Off-State Cathode

Current

Dynamic Output

Impedance

Minimum Operating

Current

. Values in bold apply over full operating ambient temperature.

٨ = 25°C

(1)

(1)

2.483 2.495 2.507 V
4 17 mV

Ref

-1.0 -2.7

-0.4 -2.0

(2)

(2)

(3)

0.1 1

= V

REF

(1)

(1)

0.4 1 mA

0.7 4

0.4 1.2

0.20 0.50

Z

V

REF

V

DEV

∆ V

REF

∆VZ

IREF

I

REF(DEV)

I

V

Z (OFF)

rz

I

V

Z(MIN)

= V

Z

= V

Z

IZ = 10mA,∆V

I

= 10mA,∆V

Z

R1 = 10kΩ, R2 = ∞,

R1 = 10kΩ, R2 = ∞,

REF

F <1kHz, V

I

= 1mA to 100mA

Z

= 10mA

REF1 IZ

= 10mA

REF1 IZ

= 10V to V

Z

= 36V to 10V

Z

I

= 10mA

Z

= 10mA

I

Z

= 0V, VZ =36V

Z

= V

Z

REF

B431 0.5%

mV/V

µA

µA

µA

Ω

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94506 Tel: [phone], Fax: [phone] www.baylinear.com

B431

Parameter Symbol Condition Min Typ Max Units

Reference Voltage V

V

Temp Deviation V

REF

Ratio of Change in

V

To Change in V

REF

Z

Reference Input

Current

I

Temperature

REF

Deviation

Off-State Cathode

Current

Dynamic Output

Impedance

Minimum Operating

Current

V

REF

V

DEV

∆ V

REF

∆VZ

IREF

I

REF(DEV)

I

V

Z (OFF)

rz

I

V

Z(MIN)

= V

Z

= V

Z

IZ = 10mA,∆V

I

= 10mA,∆V

Z

R1 = 10kΩ, R2 = ∞,

R1 = 10kΩ, R2 = ∞,

REF

F <1kHz, V

I

= 1mA to 100mA

Z

= 10mA

REF1 IZ

= 10mA

REF1 IZ

= 10V to V

Z

= 36V to 10V

Z

I

= 10mA

Z

= 10mA

I

Z

= 0V, VZ =36V

Z

= V

Z

REF

(1)

(1)

2.470 2.495 2.520 V
4 17 mV

Ref

-1.0 -2.7

-0.4 -2.0

(2)

(2)

(3)

0.1 1

= V

REF

(1)

(1)

0.4 1 mA

0.7 4

0.4 1.2

0.20 0.50

B431 1%

mV/V

µA

µA

µA

Ω

Parameter Symbol Condition Min Typ Max Units

Reference Voltage V

V

Temp Deviation V

REF

Ratio of Change in

V

To Change in V

REF

Z

Reference Input

Current

I

Temperature

REF

Deviation

Off-State Cathode

Current

Dynamic Output

Impedance

Minimum Operating

Current

V

REF

V

DEV

∆ V

REF

∆VZ

IREF

I

REF(DEV)

I

V

Z (OFF)

rz

V

I

Z(MIN)

= V

Z

= V

Z

IZ = 10mA,∆V

I

= 10mA,∆V

Z

R1 = 10kΩ, R2 = ∞,

R1 = 10kΩ, R2 = ∞,

REF

F <1kHz, V

I

= 1mA to 100mA

Z

= 10mA

REF1 IZ

= 10mA

REF1 IZ

= 10V to V

Z

= 36V to 10V

Z

I

= 10mA

Z

= 10mA

I

Z

= 0V, VZ =36V

Z

= V

Z

REF

(1)

(1)

2.445 2.495 2.545 V
4 17 mV

Ref

-1.0 -2.7

-0.4 -2.0

(2)

(2)

(3)

0.1 1

= V

REF

(1)

(1)

0.4 1 mA

0.7 4

0.4 1.2

0.20 0.50

B431 2%

mV/V

µA

µA

µA

Ω

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94506 Tel: [phone], Fax: [phone] www.baylinear.com

B431

Parameter Symbol Condition Min Typ Max Units

Reference Voltage V

V

Temp Deviation V

REF

Ratio of Change in

V

To Change in V

REF

Z

Reference Input

Current

I

Temperature

REF

Deviation

Off-State Cathode

Current

Dynamic Output

Impedance

Minimum Operating

Current

V

REF

V

DEV

∆ V

REF

∆VZ

IREF

I

REF(DEV)

I

V

Z (OFF)

rz

I

V

Z(MIN)

= V

Z

= V

Z

IZ = 10mA,∆V

I

= 10mA,∆V

Z

R1 = 10kΩ, R2 = ∞,

R1 = 10kΩ, R2 = ∞,

REF

F <1kHz, V

I

= 1mA to 100mA

Z

= 10mA

REF1 IZ

= 10mA

REF1 IZ

= 10V to V

Z

= 36V to 10V

Z

I

= 10mA

Z

= 10mA

I

Z

= 0V, VZ =36V

Z

= V

Z

REF

Note 1: B431D is rated at -40°C to +85°C and 50ppm/°C

(1)

(1)

2.470 2.495 2.520 V
4 17 mV

Ref

-1.0 -2.7

-0.4 -2.0

(2)

(2)

(3)

0.1 1

= V

REF

(1)

(1)

0.4 1 mA

0.7 4

0.4 1.2

0.20 0.50

B431D 1%

mV/V

µA

µA

µA

Ω

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94506 Tel: [phone], Fax: [phone] www.baylinear.com