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ETC |
Bay Linear
Inspire the Linear Power
Adjustable Shunt Regulator
B3431
Description
Features
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.
• Wide Operating Range …1mA to100mA
• Tight Band Gap Tolerance ….….…0.5%
• Low Temp. Coefficient…...…...30 ppm/oC
• Wide temp range of –40 to +105oC
• Available in SOT-23 package
Applications
• Switching Power Supplies
• Adjustable Power Supplies
• Linear Regulators
• Battery Powered Equipment
• Monitors, TV, VCR
• Instrumentation
Package Information
Ordering & Marking Information
SOT-23-3 (K3) LM3431
ANODE
3
12
CATHODE REF
Top View
SOT-23-3 (K3) B3431
ANODE
3
12
REF CATHODE
Top View
CATHODE (K)
Package
Tolerance
0.5%
1%
2%
SOT-23 B3431AK3 B3431BK3 B3431CK3
REFERENCE
(R)
+
-
2.5V
ANODE (A)
Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
Absolute Max Ratings
Parameter
Cathode Voltage
Continuous Cathode Current
Reference Input Current
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
Storage Temperature Range
Lead Temperature (Soldering) 10 seconds
ESD Rating (Human Body Model)
Symbol
Vz
Iz
IREF
PD
OJA
TJ
TSTG
TLEAD
TESD
Recommended Operating Conditions
Cathode Voltage, Vz
Cathode Current, Iz
Min
VREF
0.1
Max Symbol
36 V
150 mA
B3431
Maximum
37
150
10
750
775
200
575
175
160
-40 to +150
-65 to +150
300
2
Units
V
mA
mA
mW
°C/W
°C
°C
°C
kV
Electrical Characteristics
Unless specified: T٨ = 25°C. Values in bold apply over full operating ambient temperature.
Parameter
Reference Voltage
VREF Temp Deviation
Ratio of Change in
VREF To Change in VZ
Reference Input
Current
IREF Temperature
Deviation
Off-State Cathode
Current
Dynamic Output
Impedance
Minimum Operating
Current
Symbol
VREF
VDEV
Δ VREF
ΔVZ
IREF
IREF(DEV)
IZ (OFF)
rz
IZ(MIN)
Condition
VZ = VREF1 IZ = 10mA(1)
VZ = VREF1 IZ = 10mA(1)
IZ = 10mA,ΔVZ = 10V to VRef
IZ = 10mA,ΔVZ = 36V to 10V
R1 = 10kΩ, R2 = ∞,
IZ = 10mA(2)
R1 = 10kΩ, R2 = ∞,
IZ = 10mA(2)
VREF = 0V, VZ =36V(3)
F <1kHz, VZ = VREF
IZ = 1mA to 100mA(1)
VZ = VREF(1)
Min
2.490
-2.7
-2.0
B3431 0.5%
Typ Max
2.50 2.515
4 17
-1.0
-0.4 0.3
0.7 4
0.4 1.2
0.1 1
0.20 0.50
0.4 1
Units
V
mV
mV/V
µA
µA
µA
Ω
mA
Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
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