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.
B431
Features
•
•
•
•
Wide Operating Range …1mA to100mA
Tight Band Gap Tolerance …….… 0.5%
Low Temp. Coefficient………..30 ppm/
o
C
Wide temp range of –40 to +105
o
C
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
TO-92 (Z)
1
2
3
Ordering Information
Package
0.5%
TO-92
SOT-89
8SOIC
Tolerance
1%
1%
2%
Ref
Bottom View
Anode Cath
B431AZ
B431BZ
B431DBZ B431CZ
B431AR B431BR
B431DBR B431CR
B431AM B431BM
B431DBM B431CM
The Electrical Grade & Type is specified on shipping Box Only
8-Pin Surface Mount (M)
1
2
3
4
8
7
6
5
Top View
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94506
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431
Absolute Max Ratings
Parameter
Cathode Voltage
Continuous Cathode Current
Reference Input Current
Power Dissipation at T
A
- 25°C
SOT-89
S0-8
TO-92
Thermal Resistance
S0-8
TO-92
SOT-89
Operating Junction Temperature Range
Operating Ambient Temperature
Storage Temperature Range
Symbol
V
z
I
z
I
REF
P
D
Maximum
37
150
10
1000
750
775
175
160
110
-40 to +150
-40 to +105
-65 to +150
Units
V
mA
mA
mW
O
JA
T
J
T
A
T
STG
°C/W
°C
°C
°C
Lead Temperature (Soldering) 10 seconds
ESD Rating (Human Body Model)
T
LEAD
T
ESD
300
2
°C
kV
Recommended Operating Conditions
Min
Cathode Voltage, Vz
Cathode Current, Iz
V
REF
0.1
Max
36
100
Symbol
V
mA
Electrical Characteristics
Unless specified: T
٨
= 25°C
.
Values in bold apply over full operating ambient temperature.
B431 0.5%
Parameter
Reference Voltage
V
REF
Temp Deviation
Ratio of Change in
V
REF
To Change in V
Z
Reference Input
Current
I
REF
Temperature
Deviation
Off-State Cathode
Current
Dynamic Output
Impedance
Minimum Operating
Current
Symbol
V
REF
V
DEV
∆
V
REF
∆V
Z
IREF
I
REF(DEV)
I
Z (OFF)
rz
I
Z(MIN)
Condition
V
Z
= V
REF1
I
Z
= 10mA
(1)
V
Z
= V
REF1
I
Z
= 10mA
(1)
I
Z
= 10mA,∆V
Z
= 10V to V
Ref
I
Z
= 10mA,∆V
Z
= 36V to 10V
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
V
REF
= 0V, V
Z
=36V
(3)
F <1kHz, V
Z
= V
REF
I
Z
= 1mA to 100mA
(1)
V
Z
= V
REF(1)
Min
2.483
Typ
2.495
4
-1.0
-0.4
0.7
0.4
0.1
0.20
0.4
Max
2.507
17
-2.7
-2.0
4
1.2
1
0.50
1
Units
V
mV
mV/V
µA
µA
µA
Ω
mA
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94506
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431
B431 1%
Parameter
Reference Voltage
V
REF
Temp Deviation
Ratio of Change in
V
REF
To Change in V
Z
Reference Input
Current
I
REF
Temperature
Deviation
Off-State Cathode
Current
Dynamic Output
Impedance
Minimum Operating
Current
Symbol
V
REF
V
DEV
∆
V
REF
∆V
Z
IREF
I
REF(DEV)
I
Z (OFF)
rz
I
Z(MIN)
Condition
V
Z
= V
REF1
I
Z
= 10mA
(1)
V
Z
= V
REF1
I
Z
= 10mA
(1)
I
Z
= 10mA,∆V
Z
= 10V to V
Ref
I
Z
= 10mA,∆V
Z
= 36V to 10V
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
V
REF
= 0V, V
Z
=36V
(3)
F <1kHz, V
Z
= V
REF
I
Z
= 1mA to 100mA
(1)
V
Z
= V
REF(1)
Min
2.470
Typ
2.495
4
-1.0
-0.4
0.7
0.4
0.1
0.20
0.4
Max
2.520
17
-2.7
-2.0
4
1.2
1
0.50
1
Units
V
mV
mV/V
µA
µA
µA
Ω
mA
B431 2%
Parameter
Reference Voltage
V
REF
Temp Deviation
Ratio of Change in
V
REF
To Change in V
Z
Reference Input
Current
I
REF
Temperature
Deviation
Off-State Cathode
Current
Dynamic Output
Impedance
Minimum Operating
Current
Symbol
V
REF
V
DEV
∆
V
REF
∆V
Z
IREF
I
REF(DEV)
I
Z (OFF)
rz
I
Z(MIN)
Condition
V
Z
= V
REF1
I
Z
= 10mA
(1)
V
Z
= V
REF1
I
Z
= 10mA
(1)
I
Z
= 10mA,∆V
Z
= 10V to V
Ref
I
Z
= 10mA,∆V
Z
= 36V to 10V
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
V
REF
= 0V, V
Z
=36V
(3)
F <1kHz, V
Z
= V
REF
I
Z
= 1mA to 100mA
(1)
V
Z
= V
REF(1)
Min
2.445
Typ
2.495
4
-1.0
-0.4
0.7
0.4
0.1
0.20
0.4
Max
2.545
17
-2.7
-2.0
4
1.2
1
0.50
1
Units
V
mV
mV/V
µA
µA
µA
Ω
mA
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94506
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431
B431D 1%
Parameter
Reference Voltage
V
REF
Temp Deviation
Ratio of Change in
V
REF
To Change in V
Z
Symbol
V
REF
V
DEV
∆
V
REF
∆V
Z
Condition
V
Z
= V
REF1
I
Z
= 10mA
(1)
V
Z
= V
REF1
I
Z
= 10mA
(1)
I
Z
= 10mA,∆V
Z
= 10V to V
Ref
I
Z
= 10mA,∆V
Z
= 36V to 10V
Min
2.470
Typ
2.495
4
-1.0
-0.4
0.7
0.4
0.1
0.20
0.4
Max
2.520
17
-2.7
-2.0
4
1.2
1
0.50
1
Units
V
mV
mV/V
µA
µA
µA
Ω
mA
Reference Input
R1 = 10kΩ, R2 =
∞,
IREF
Current
I
Z
= 10mA
(2)
I
REF
Temperature
R1 = 10kΩ, R2 =
∞,
I
REF(DEV)
Deviation
I
Z
= 10mA
(2)
Off-State Cathode
I
Z (OFF)
V
REF
= 0V, V
Z
=36V
(3)
Current
Dynamic Output
F <1kHz, V
Z
= V
REF
rz
Impedance
I
Z
= 1mA to 100mA
(1)
Minimum Operating
I
Z(MIN)
V
Z
= V
REF(1)
Current
Note 1: B431D is rated at -40°C to +85°C and 50ppm/°C
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94506
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431
Calculating Average Temperature Coefficient (TC)
ppm
%
mV
0
0
0
TC in mV/°C =
∆V
REF
(mV)
∆T
A
∆V
REF
V
REF
at 25°C
∆T
A
∆V
REF
V
REF
at 25°C
∆T
A
-10
5000
0.5
TC in %/°C =
-20
-55
-25
0
25
50
75
100 125
TC in ppm/°C =
Temperature (°C)
0.06 mV/°C
0.002 %/°C
24 ppm/°C
Test Circuit
V
IN
V
KA
= V
REF
V
IN
V
KA
V
IN
I
REF
I
K
R
1
(V
REF
)
R
2
I
K
Figure
1a. Test Circuit 1
Figure
1b. Test Circuit 2
Figure
1c. Test Circuit 3
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94506
Tel: (925) 606-5950, Fax: (925) 940-9556
)
)
∆V
REF
∆Τ
)
)
x 100
x 10
6
V
KA
I
K (OFF)
www.baylinear.com
京公网安备 11010802033920号
EEWORLD
