BAYLI B3431CK3, B3431BK3, B3431AK3 Datasheet

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Bay Linear

Bay Linear

Bay LinearBay Linear

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Adjustable Shunt Regulator

B3431

Description

The Bay Linear B3431 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 B3431 a superior replacement for
zener diode applications.

.

The B3431 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 Tolera nce ….….…0.5%

• Low Temp. Coefficient…...…...30 ppm/

• Wide temp range of –40 to +105

• Available in SOT-23 package

Applications

• Switching Power Supplies

• Adjustable Power Supplies

• Linear Regulators

• Battery Powered Equipment

• Monitors, TV, VCR

• Instrumentation

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Package Information Ordering & Marking Information

SOT-23-3 (K3) B343 1

SOT-23-3 (K3) B343 1

SOT-23-3 (K3) LM343 1

SOT-23-3 (K3) LM343 1

SOT-23-3 (K3) LM343 1

ANODE

ANODE

ANODE

3

3

3

1

1

1

2

2

2

SOT-23-3 (K3) B343 1

ANODE

ANODE

ANODE

3

3

3

1

1

1

Package Tolerance

0.5% 1% 2%
SOT-23 B3431AK3 B3431BK3 B3431CK3

2

2

2

CATHODE

REF

CATHODE

REF

CATHODE

REFCATHODE

REFCATHODE

REFCATHODE

Top View

Top View

Top View

REF

Top View

Top View

Top View

CATHODE (K)

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C

REFERENCE

(R)

Bay Linear, Inc

2478Armstrong St., Livermore CA USA 9550 Tel: [phone], Fax: [phone] www.baylinear.com

2.5V

+

-

ANODE (A)

B3431

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
S0-8
TO-92
SOT-23-3
Thermal Resistance
SOT-23-3
S0-8
TO-92
Operating Junction Temperature Range TJ -40 to +150
Storage Temperature Range T
Lead Temperature (Soldering) 10 seconds T
ESD Rating (Human Body Model) T

10 mA

REF

P

D

OJA

-65 to +150

STG

300

LEAD

2 kV

ESD

750
775
200

575
175
160

mW

C/W

°

C

°

C

°

C

°

Recommended Operating Conditions

Min Max Symbol

Cathode Voltage, Vz V

36 V

REF

Cathode Current, Iz 0.1 150 mA

Electrical Characteristics

.

Unless specified: T

٨ = 25°C

Values in bold apply over full operating ambient temperature

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

Z

V

REF

V

DEV

Δ V

REF

ΔVZ

IREF

I

REF(DEV)

I

V

Z (OFF)

rz

I

V

Z(MIN)

= V

Z

= V

Z

IZ = 10mA,ΔV

= 10mA,ΔV

I

Z

R1 = 10kΩ, R2 = ∞,

R1 = 10kΩ, R2 = ∞,

REF

F <1kHz, V

= 1mA to 100mA

I

Z

= 10mA

REF1 IZ

= 10mA

REF1 IZ

= 10V to V

Z

= 36V to 10V

Z

= 10mA

I

Z

= 10mA

I

Z

= 0V, VZ =36V

Z

= V

Z

REF

(1)

(1)

(2)

(2)

(3)

= V

REF

(1)

(1)

0.4 1

2.490 2.50 2.515 V

Ref

-2.7 -1.0

-2.0 -0.4 0.3

0.7

0.20 0.50

.

B3431 0.5%

4 17 mV

mV/V

4

0.4 1.2

0.1 1

µµµµA
µµµµA
µµµµA

Ω

mA

Bay Linear, Inc

2478Armstrong St., Livermore CA USA 9550 Tel: [phone], Fax: [phone] www.baylinear.com

B3431

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

Δ V

REF

ΔVZ

IREF

I

REF(DEV)

I

V

Z (OFF)

rz

I

V

Z(MIN)

= V

Z

= V

Z

IZ = 10mA,ΔV

= 10mA,ΔV

I

Z

R1 = 10kΩ, R2 = ∞,

R1 = 10kΩ, R2 = ∞,

REF

F <1kHz, V

= 1mA to 100mA

I

Z

= 10mA

REF1 IZ

= 10mA

REF1 IZ

= 10V to V

Z

= 36V to 10V

Z

= 10mA

I

Z

= 10mA

I

Z

= 0V, VZ =36V

Z

= V

Z

REF

(1)

(1)

2.474 2.50 2.526 V

Ref

-2.7 -1.0

-2.0 -0.4 0.3

(2)

(2)

(3)

= V

REF

(1)

(1)

0.4 1

0.7

0.20 0.50

B3431 1%

4 17 mV

mV/V

4

0.4 1.2

0.1 1

µµµµA
µµµµA
µµµµA

Ω

mA

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

Δ V

REF

ΔVZ

IREF

I

REF(DEV)

I

V

Z (OFF)

rz

I

V

Z(MIN)

= V

Z

= V

Z

IZ = 10mA,ΔV

= 10mA,ΔV

I

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

= 10mA

I

Z

= 10mA

I

Z

= 0V, VZ =36V

Z

= V

Z

REF

(1)

(1)

2.445 2.495 2.545 V

Ref

-2.7 -1.0

-2.0 -0.4 0.3

(2)

(2)

(3)

= V

REF

(1)

(1)

0.4 1

0.7

0.20 0.50

B3431 2%

4 17 mV

mV/V

4

0.4 1.2

0.1 1

µµµµA
µµµµA
µµµµA

Ω

mA

Bay Linear, Inc

2478Armstrong St., Livermore CA USA 9550 Tel: [phone], Fax: [phone] www.baylinear.com