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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/oC Wide temp range of -40 to +105oC 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 TA - 25C 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
Vz Iz IREF PD
Maximum
37 150 10 1000 750 775 175 160 110 -40 to +150 -40 to +105 -65 to +150
Units
V mA mA mW
OJA TJ TA TSTG
C/W C C C
Lead Temperature (Soldering) 10 seconds ESD Rating (Human Body Model)
TLEAD TESD
300 2
C kV
Recommended Operating Conditions
Min
Cathode Voltage, Vz Cathode Current, Iz VREF 0.1
Max
36 100
Symbol
V mA
Electrical Characteristics
Unless specified: T = 25C. Values in bold apply over full operating ambient temperature. B431 0.5% 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 VREF VZ IREF IREF(DEV) IZ (OFF) rz IZ(MIN) Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1 IZ = 10mA(1) IZ = 10mA,VZ = 10V to VRef IZ = 10mA,VZ = 36V to 10V R1 = 10k, R2 = , IZ = 10mA(2) R1 = 10k, R2 = , IZ = 10mA(2) VREF = 0V, VZ =36V(3) F <1kHz, VZ = VREF IZ = 1mA to 100mA(1) VZ = VREF(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 A A A 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 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 VREF VZ IREF IREF(DEV) IZ (OFF) rz IZ(MIN) Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1 IZ = 10mA(1) IZ = 10mA,VZ = 10V to VRef IZ = 10mA,VZ = 36V to 10V R1 = 10k, R2 = , IZ = 10mA(2) R1 = 10k, R2 = , IZ = 10mA(2) VREF = 0V, VZ =36V(3) F <1kHz, VZ = VREF IZ = 1mA to 100mA(1) VZ = VREF(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 A A A mA
B431 2% 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 VREF VZ IREF IREF(DEV) IZ (OFF) rz IZ(MIN) Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1 IZ = 10mA(1) IZ = 10mA,VZ = 10V to VRef IZ = 10mA,VZ = 36V to 10V R1 = 10k, R2 = , IZ = 10mA(2) R1 = 10k, R2 = , IZ = 10mA(2) VREF = 0V, VZ =36V(3) F <1kHz, VZ = VREF IZ = 1mA to 100mA(1) VZ = VREF(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 A A A 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 VREF Temp Deviation Ratio of Change in VREF To Change in VZ Symbol VREF VDEV VREF VZ Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1 IZ = 10mA(1) IZ = 10mA,VZ = 10V to VRef IZ = 10mA,VZ = 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 A A A mA
Reference Input R1 = 10k, R2 = , IREF Current IZ = 10mA(2) IREF Temperature R1 = 10k, R2 = , IREF(DEV) Deviation IZ = 10mA(2) Off-State Cathode IZ (OFF) VREF = 0V, VZ =36V(3) Current Dynamic Output F <1kHz, VZ = VREF rz Impedance IZ = 1mA to 100mA(1) Minimum Operating IZ(MIN) VZ = VREF(1) Current Note 1: B431D is rated at -40C to +85C 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 =
VREF (mV) TA VREF VREF at 25C TA VREF VREF at 25C TA
-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
VIN
VKA = VREF
VIN
VKA
VIN
IREF
IK
R1 (VREF) R2
IK
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
)
)
VREF
) )
x 100
x 106
VKA
IK (OFF)
www.baylinear.com
B431
TYPICAL PERFORMANCE CURVES
Low Current Operating Characteristics
900 800 700 600 VKA = VREF Temperature Range: - 0 to 105 C 150 125 100 75 50 25 0 -25 -50 0 -100 -200 -1.0 0 1.0 2.0 3.0 -75 -100 -2
High Current Operating Characteristics
V KA = V REF Temperature Range: - 0 to 105 C
IK - Cathode Current ( A)
500 400 300 200 100 105 C 25 C -0C
IK - Cathode Current (mA)
-1
0
1
2
3
VKA - Cathode Voltage (V)
VKA - Cathode Voltage (V)
Figure 2 Off State Leakage
100 2.53
Figure 3
Reference Voltage vs. Ambient Temperature
VKA = V REF IK = 10 mA
VKA = 18V VREF = 0V IZ off - Off State Cathode Current (nA)
10
2.52
VREF - Reference Voltage (V)
2.51
2.50
1
VREF = 2.500 V at 25 C
2.49
2.48
0.1
2.47
2.46
0.01 -60 -30 0 30 60 90 120
2.45 -60 -30 0 30 60 90 120
TA - Ambient Temperature ( C)
Figure 4
TA - Ambient Temperature ( C)
Figure 5
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94506
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431
TYPICAL PERFORMANCE CURVES
Reference Input Current
3.0
0
Reference Voltage Line Regulation
( IREF - Reference Input Current A)
2.5
VREF - Change in Reference Voltage (mV)
R1 = 10 k R2 = IK = 10 mA
-10
2.0
-20
0 C 25 C 75 C 105 C
1.5
-30
1.0
-40
0.5
-50 0 -60 -30 0 30 60 90 120 0 3 6 9 12 15 18
TA - Ambient Temperature ( C) Figure 6 Noise Voltage
70 0.150
VKA - Cathode Voltage (V) Figure 7 Low Frequency Dynamic Output Impedance
VKA = VREF IKA = 1 to 100 mA f < 1 kHz
60
0.125
50
ZKA - Dynamic Impedance ( )
V KA = V REF IK = 10 mA TA = 25C
10 100 1k 10 k 100 k
Noise Voltage nV/ Hz
0.100
40
0.075
30
0.050
20
0.025 10
0.0 -60 -30 0 30 60 90 120
0
f - Frequency (Hz) Figure 8
TA - Free Air Temperature Figure 9
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94506
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431
TYPICAL PERFORMANCE CURVES
Dynamic Output Impedance
100
TA = 25 C IK = 1 to 100 mA
ZKA - Dynamic Impedance
10
1.0
0.1
0.01 1k 10 k 100 k 1M 10 M
f - Frequency (Hz) Figure 10
Small Signal Voltage Gain vs. Frequency
70
Temperature Range: -0 to 105 C
60
AV - Small Signal Voltage Gain (dB)
IK = 10 mA
50
OUT
40
15 k 9 F
30
IK
230
20
8.25 k GND
10
0 1k 10 k 100 k 1M 10 M
f - Frequency (Hz)
Figure 11
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94506
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431
TYPICAL PERFORMANCE CURVES
Pulse Response
6
5
INPUT
INPUT MONITOR
220 OUT
Input and Output Voltages (V)
4
3
OUTPUT
2
50 fP = 100 kHz
1
GND
0
-1 0 1 2 3 4 5 6 7 8 9 10 11 12
t - Time (s) Figure 12 Stability Boundary Conditions
100
90
A: B: C: D:
V KA = V REF V KA = 5V at I K = 10 mA V KA = 10V at I K = 10 mA V KA= 15V at I K = 10 mA
80
70
C 150 IK
IK - Cathode Current (mA)
60
50
40
STABILITY REGION
30
CL A B D
20
10 k
10
TA = 25 C
0 10 0 10 1 10 2 10 3 10 4 10 5 10 6 107
CL - Load Capacitance (pF)
Figure 13
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94506
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431
TO-92
0.090 (2.286) Radius typ. 2 1 3 0.145 (3.683) 0.135 (3.429) 0.055 (1.397) 0.045 (1.143)
10 typ.
BOTTOM VIEW
0.185 (4.699) 0.045 (1.143) 0.085 (2.159) Diameter
5 typ. 0.185 (4.699) 0.175 (4.445) 0.090 (2.286) typ. 5 typ. Seating Plane
0.025 (0.635) Max Uncontrolled Lead Diameter 0.500 (12.70) Min.
0.016 (0.406) 0.014 (0.356) 0.055 (1.397) 0.045 (1.143) 0.105 (2.667) 0.095 (2.413) 0.0155 (0.3937) 0.0145 (0.3683)
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94506
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431
SOT-89
A
C
J
N P 1 2 3
K B F G -TD
STYLE 1 PIN 1. BASE 2. COLLECTOR 3. EMITTER
rr
STYLE 3 PIN 1. GATE 2. ANODE 3. CATHODE
DIM A B C D E F G J K L N P
STYLE 2 PIN 1. ANODE 2. CATHODE 3. NO CONNECTION
STYLE 4 PIN 1. DRAIN 2. GATE 3. SOURCE
MILLIMETERS MIN MAX 4.40 4.60 2.29 2.60 140 160 0.36 0.48 1.62 1.80 0.44 0.53 150 BSC 0.35 0.44 0.80 1.04 300 BSC 2.04 2.28 3.94 4.25
INCHES MIN MAX 0.174 0.181 0.091 0.102 0.056 0.062 0.015 0.018 0.064 0.070 0.018 0.020 0.059 BSC 0.014 0.017 0.032 0.040 0.118 BSC 0.081 0.089 0.156 0.167
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
2418 Armstrong Street, Livermore, CA 94506
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com

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