Bay Linear
Inspire the Linear Power
1.25V Adjustable Shunt Regulator
Description
The B432 is a three terminal adjustable shunt regulator with
thermal stability of 50ppm/°C. The output voltage can be
adjusted to any value from 1.25V (V
REF
) to 15V with two
external resistors. The B432 is an ideal voltage reference in an
isolated feedback circuit for 3.0V switch mode power supplies
The B432 shunt regulator is available with three voltage
tolerances (0.5%, 1.0% and 2.0%) and three package options
(SOT-23-3, TO-92, 8SOIC). This allows the designer the
opportunity to select the optimum combination of cost and
performance for their application.
B432
Features
•
•
•
•
Low voltage operation (down to 1.25V)
Wide operating current….1mA to 100mA
Trimmed bandgap design ± 0.5%
Wide temperature range 0°C to +105°C
°
°
Available in SOT-23-3, TO-92 , 8SOIC
Upgrade for TLV431A & Cross AS432
•
•
Applications
•
•
•
•
•
•
Switching Power Supplies
Adjustable Power Supplies
Linear Regulators
Battery Powered Equipment
Monitors, TV, VCR
Instrumentation
Pin Connection
Ordering Information
Package
TO-92
SO-8
SOT-23
0.5%
B432AZ
B432AM
B432AK3
Tolerance
1%
B432BZ
B432BM
B432BK3
2%
B432CZ
B432CM
B432CK3
SOT-23-3 (K3)
TO-92 (Z)
1
2
3
Anode
BAY
Ref
Anode
Bottom View
Cathode
Ref
Cathode
Top View
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B432
Absolute Maximum Rating
Parameter
Cathode Voltage
Continuous Cathode Current
Power Dissipation at T
A
- 25°C
SOT-23-3
S0-8
TO-92
Thermal Resistance
SOT-23-3
S0-8
TO-92
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 seconds
ESD Rating (Human Body Model)
Recommended Operating Conditions
Symbol
V
z
I
z
P
D
Maximum
18
100
200
750
775
575
175
160
-40 to +150
-65 to +150
300
2
Units
V
mA
mW
O
JA
T
J
T
STG
T
LEAD
T
ESD
°C/W
°C
°C
°C
kV
Min
Cathode Voltage, Vz
Cathode Current, Iz
V
REF
1.0
Max
15
100
Symbol
V
mA
Electrical Characteristics
Unless specified: T
٨
= 25°C
. Values in bold apply over full operating ambient temperature.
B432 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
Min Operating
Current
Symbol
V
REF
V
DEV
Δ
V
REF
ΔV
Z
I
REF
I
REF(DEV)
I
Z (OFF)
V
REF
= 0V, V
Z
=15V
I
Z(MIN)
V
Z
= V
REF(1)
(3)
Condition
V
Z
= V
REF1
I
Z
= 10mA
(1)
V
Z
= V
REF1
I
Z
= 10mA
(1)
I
Z
= 10mA,ΔV
Z
= 15V to V
Ref
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
Min
1.243
Typ
1.250
2
-1.5
3
0.3
Max
1.257
16
-2.7
6
0.6
Units
V
mV
mV/V
µA
µA
nA
0.05
0.6
500
1
mA
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B432
Electrical Characteristics
Unless specified: T
٨
= 25°C
. Values in bold apply over full operating ambient temperature.
B432 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
Min Operating
Current
Symbol
V
REF
V
DEV
Δ
V
REF
ΔV
Z
I
REF
I
REF(DEV)
I
Z (OFF)
V
REF
= 0V, V
Z
=15V
I
Z(MIN)
V
Z
= V
REF(1)
(3)
Condition
V
Z
= V
REF1
I
Z
= 10mA
(1)
V
Z
= V
REF1
I
Z
= 10mA
(1)
I
Z
= 10mA,ΔV
Z
= 15V to V
Ref
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
Min
1.237
Typ
1.250
2
-1.5
3
0.3
Max
1.262
16
-2.7
6
0.6
Units
V
mV
mV/V
µA
µA
nA
0.05
0.6
500
1
mA
Unless specified: T
٨
= 25°C
. Values in bold apply over full operating ambient temperature.
B432 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
Min Operating
Current
Symbol
V
REF
V
DEV
Δ
V
REF
ΔV
Z
I
REF
I
REF(DEV)
I
Z (OFF)
V
REF
= 0V, V
Z
=15V
I
Z(MIN)
V
Z
= V
REF(1)
(3)
Condition
V
Z
= V
REF1
I
Z
= 10mA
(1)
V
Z
= V
REF1
I
Z
= 10mA
(1)
I
Z
= 10mA,ΔV
Z
= 15V to V
Ref
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
R1 = 10kΩ, R2 =
∞,
I
Z
= 10mA
(2)
Min
1.225
Typ
1.250
2
-1.5
3
0.3
Max
1.275
16
-2.7
6
0.6
Units
V
mV
mV/V
µA
µA
nA
0.05
0.6
500
1
mA
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B432
V
in
10nf
V
REF
V
in
V
out
10nf
I
(OFF)
R
1
I
ref
R
2
I
K
V
REF
Test Circuit for V
KA
> V
REF
Test Circuit for I
OFF
V
O
= V
KA
= V
REF
x (1 + R
1
/R
2
) - I
REF
x R
1
+3.3V
0.1µF
470µF
+12V
PHD 3055E
500Ω
2.7V
140Ω
0.1µF
0.1µF
B431L
120Ω
0.1µF
INTEL
I 740
1000µF
*If the output voltage has noise, then please add a 0.1µF in between drain and gate of power MOSFET to
reduce the noise.
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B432
SOT-23
0.015 - 0.018
(0.381 - 0.457)
0.047 - 0.055 0.083 - 0.098
(1.194 - 1.397) (2.108 - 2.489)
0.035 - 0.040
(0.889 - 1.016)
0.020 - 0.024
(0.508 - 0.610)
0.070 - 0.080
(1.778 - 2.032)
0.110 - 0.120
(2.794 - 3.048)
0.003 - 0.005
(0.076 - 0.127)
0.001 - 0.004
(0.025 - 0.102)
0.030 - 0.041
(0.762 - 1.041)
0.018 - 0.024
(0.457 - 0.610)
Advance Information-
These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations,
computer simulations and/ or initial prototype evaluation.
Preliminary Information-
These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are
subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges.
The application circuit examples are only to explain the representative applications of the devices and are not intended to guarantee any circuit
design or permit any industrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any
industrial property right resulting from the use of the contents shown in the data book. Typical parameters can and do vary in different
applications. Customer’s technical experts must validate all operating parameters including “ Typical” for each customer application.
LIFE SUPPORT AND NUCLEAR POLICY
Bay Linear products are not authorized for and should not be used within life support systems which are intended for surgical
implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications without
the specific written consent of Bay Linear President.
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
