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Bay Linear
Bay Linear
Bay LinearBay Linear
Inspire the Linear Power
Inspire the Linear Power
Inspire the Linear PowerInspire the Linear Power
1.25V Adjustable Shunt Regulator
B432
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
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.
) to 15V with two
REF
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 Tolerance
0.5% 1% 2%
TO-92 B432AZ B432BZ B432CZ
SO-8 B432AM B432BM B432CM
SOT-23 B432AK3 B432BK3 B432CK3
TO-92 (Z)
TO-92 (Z)
2
2
13
13
SOT-23-3 (K3)
SOT-23-3 (K3)
Anode
Anode
BAY
BAY
Ref
Ref
Anode
Anode
Bottom View
Bottom View
Cathode
Cathode
Ref
Ref
Top View
Top View
Cathode
Cathode
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
Page 2
B432
Absolute Maximum Rating
Parameter Symbol Maximum Units
Cathode Voltage Vz 18 V
Continuous Cathode Current Iz 100 mA
Power Dissipation at TA - 25°C
SOT-23-3
S0-8
TO-92
Thermal Resistance
SOT-23-3
S0-8
TO-92
P
D
O
JA
200
750
775
575
175
160
Operating Junction Temperature Range TJ -40 to +150
Storage Temperature Range T
Lead Temperature (Soldering) 10 seconds T
ESD Rating (Human Body Model) T
Recommended Operating Con ditions
-65 to +150
STG
300
LEAD
2 kV
ESD
mW
°
C/W
°
°
°
C
C
C
Min Max Symbol
Cathode Voltage, Vz V
Cathode Current, Iz 1.0 100 mA
15 V
REF
Electrical Characteristics
Unless specified: T
. Values in bold apply over full operating ambient temperature.
٨ = 25°C
Parameter Symbol Condition Min Typ Max Units
V
Temp Deviation V
REF
V
REF
V
DEV
Z
Z
= V
= V
REF1 IZ
REF1 IZ
= 10mA
= 10mA
(1)
(1)
1.243 1.257 Reference Voltage V
2 16 mV
B432 0.5%
1.250
V
Ratio of Change in
V
To Change in V
REF
Reference Input
Current
I
Temperature
REF
Deviation
Off-State Cathode
Current
Min Operating
Current
Bay Linear, Inc
Δ V
ΔVZ
I
REF
I
REF(DEV)
I
Z (OFF)
I
Z(MIN)
REF
Z
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
I
= 10mA,ΔV
Z
R1 = 10kΩ, R2 = ∞,
I
R1 = 10kΩ, R2 = ∞,
I
Z
= 10mA
Z
= 10mA
Z
= 15V to V
(2)
(2)
V
= 0V, VZ =15V
REF
V
= V
Z
(1)
0.6 1 mA
REF
-1.5 -2.7 mV/V
Ref
3 6
0.3 0.6
µ
µ
(3)
0.05 500
nA
A
A
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B432
Electrical Characteristics
B432 1%
1.250
V
Unless specified: T
. Values in bold apply over full operating ambient temperature.
٨ = 25°C
Parameter Symbol Condition Min Typ Max Units
V
Temp Deviation V
REF
V
REF
V
DEV
Z
Z
= V
= V
REF1 IZ
REF1 IZ
= 10mA
= 10mA
(1)
(1)
1.237 1.262 Reference Voltage V
2 16 mV
Ratio of Change in
V
To Change in V
REF
Reference Input
Current
I
Temperature
REF
Deviation
Off-State Cathode
Current
Min Operating
Z
Δ V
REF
= 10mA,ΔV
I
Z
ΔVZ
I
REF
I
REF(DEV)
I
Z (OFF)
I
V
Z(MIN)
R1 = 10kΩ, R2 = ∞,
R1 = 10kΩ, R2 = ∞,
V
REF
= 15V to V
Z
I
= 10mA
Z
I
= 10mA
Z
(2)
(2)
= 0V, VZ =15V
(1)
= V
Z
0.6 1 mA
REF
-1.5 -2.7 mV/V
Ref
3 6
0.3 0.6
µ
µ
(3)
0.05 500
nA
A
A
Current
B432 2%
1.250
V
µ
A
µ
A
nA
Unless specified: T
. Values in bold apply over full operating ambient temperature.
٨ = 25°C
Parameter Symbol Condition Min Typ Max Units
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
Z
V
REF
V
DEV
Δ V
REF
ΔVZ
I
REF
I
REF(DEV)
I
Z (OFF)
= V
Z
REF1 IZ
= V
Z
REF1 IZ
= 10mA,ΔV
I
Z
R1 = 10kΩ, R2 = ∞,
I
= 10mA
Z
R1 = 10kΩ, R2 = ∞,
I
= 10mA
Z
V
= 0V, VZ =15V
REF
= 10mA
= 10mA
= 15V to V
Z
Min Operating
I
V
Z(MIN)
= V
Z
REF
Current
(1)
1.225 1.275 Reference Voltage V
(1)
-1.5 -2.7 mV/V
Ref
(2)
(2)
2 16 mV
3 6
0.3 0.6
(3)
(1)
0.6 1 mA
0.05 500
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
Page 4
B432
V
10nf
10nf
V
REF
REF
V
V
V
in
in
V
10nf
10nf
out
out
V
V
in
in
I
I
(OFF)
(OFF)
R1 I
R1 I
ref
ref
I
IKI
K
K
R
R
V
V
REF
REF
2
2
Test Circuit for I
Test Circuit for I
OFF
OFF
VO= VKA= V
VO= VKA= V
VO= VKA= V
+3.3V
Test Circuit for VKA> V
Test Circuit for VKA> V
x (1 + R1/R2) - I
x (1 + R1/R2) - I
x (1 + R1/R2) - I
REF
REF
REF
REF
REF
REF
REF
REF
x R
x R
x R
1
1
1
470µF0.1µF
+12V
500Ω
Ω
0.1µF
0.1µF
B431L
*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
140
120
Ω
PHD 3055E
2.7V
0.1µF
INTEL
I 740
1000µF
Page 5
B432
SOT-23
0.015 - 0.018
(0.381 - 0.457)
0.047 - 0.055
(1.194 - 1.397)
0.083 - 0.098
(2.108 - 2.489)
0.020 - 0.024
(0.508 - 0.610)
0.035 - 0.040
(0.889 - 1.016)
0.070 - 0.080
(1.778 - 2.032)
0.110 - 0.120
(2.794 - 3.048)
0.003 - 0.005
(0.076 - 0.127)
Advance Information
computer simulations and/ or initial prototype evaluation.
0.001 - 0.004
(0.025 - 0.102)
-
These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations,
0.030 - 0.041
(0.762 - 1.041)
0.018 - 0.024
(0.457 - 0.610)
-
Preliminary Information
subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges.
These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are
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
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