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Bay Linear
Inspire the Linear Power
1.24V Adjustable Shunt Regulator
Description
The B431L is a three terminal adjustable shunt regulator with thermal stability of 50ppm/C. The output voltage can be adjusted to any value from 1.24V (VREF) to 16V with two external resistors. These devices have a typical output impedance of 0.05. Active output circuitry provides a very sharp turn-on characteristics and making the device excellent replacement for zener diodes in many applications. The B431L is an ideal voltage reference in an isolated feedback circuit for 3.0V switch mode power supplies The B431L 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.
B431L
Features
* * * * * Low voltage operation (down to 1.24V) Wide operating current......80A to 100mA Trimmed bandgap design.............. 0.5% Low Dynamic Output Impedance.......0.05 Wide temperature range...... -40C to +85C Available in ........SOT-23-3, TO-92 , 8SOIC Pin-to-Pin Replacement ................SC431L
* *
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% B431LAZ B431LAM B431LAK3
Tolerance 1% B431LBZ B431LBM B431LBK3
2% B431LCZ B431LCM B431LCK3
SOT-23-3 (K3) TO-92 (Z)
1 2 3 Anode
BAY
Ref
Anode Bottom View
Cathode
Ref
Cathode
Top View
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Absolute Maximum Rating Parameter
Cathode Voltage Continuous Cathode Current Reference Input Current Range Power Dissipation at TA - 25C 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
Vz Iz PD
Maximum
20 100 3 0.37 0.75 0.95 336 175 132 -40 to +150 -65 to +150 300 2
Units
V mA mA W
OJA TJ TSTG TLEAD TESD
C/W C C C kV
Min
Cathode Voltage, Vz Cathode Current, Iz VREF 80A
Max
16 100
Symbol
V mA
Electrical Characteristics
Unless specified: T = 25C. Values in bold apply over full operating ambient temperature. B431LA 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 Min Operating Current Dynamic Impedance Symbol VREF VDEV VREF VZ IREF IREF(DEV) IZ (OFF) Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1, IZ = 10mA IA=full range IZ = 10mA,VZ = 16V to VRef (2) R1 = 10k, R2 = , IZ = 10mA(2) R1 = 10k, R2 = , IZ = 10mA(2) VREF = 0V, VZ =16V(3) VREF = 0V, VZ =16V(3) VZ = VREF(1) VKA=Vref, IK=100A to 100mA, f1kHA
(1)
Min 1.234 1.222
Typ 1.240 10 -2.7 0.15 0.1 0.125 0.135 20 0.05
Max 1.246 1.258 25 -1.0 0.5 0.4 0.150
Units V mV mV/V A A A
0.150 80 0.15 A
IZ(MIN) ZKA
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Electrical Characteristics
Unless specified: T = 25C. Values in bold apply over full operating ambient temperature. B431LB 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 Min Operating Current Dynamic Impedance Symbol VREF VDEV VREF VZ IREF IREF(DEV) IZ (OFF) Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1, IZ = 10mA(1) IA=full range IZ = 10mA,VZ = 16V to VRef (2) R1 = 10k, R2 = , IZ = 10mA(2) R1 = 10k, R2 = , IZ = 10mA(2) VREF = 0V, VZ =16V(3) VREF = 0V, VZ =16V(3) IZ(MIN) ZKA VZ = VREF(1) VKA=Vref, IK=100A to 100mA, f1kHA Min 1.228 1.215 10 -1.0 0.15 0.1 0.125 0.135 20 0.05 Typ 1.240 Max 1.252 1.265 25 -2.7 0.5 0.4 0.150 A 0.150 80 0.15 A mV mV/V A A Units V
Electrical Characteristics
Unless specified: T = 25C. Values in bold apply over full operating ambient temperature. B431LC 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 Min Operating Current Dynamic Impedance Symbol VREF VDEV VREF VZ IREF IREF(DEV) IZ (OFF) Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1, IZ = 10mA IA=full range IZ = 10mA,VZ = 16V to VRef (2) R1 = 10k, R2 = , IZ = 10mA(2) R1 = 10k, R2 = , IZ = 10mA(2) VREF = 0V, VZ =16V(3) VREF = 0V, VZ =16V(3) IZ(MIN) ZKA VZ = VREF(1) VKA=Vref, IK=100A to 100mA, f1kHA
(1)
Min 1.215 1.200
Typ 1.240 10 -1.0 0.15 0.1 0.125 0.135 20 0.05
Max 1.265 1.280 35 -2.7 0.5 0.4 0.150
Units V mV mV/V A A A
0.150 80 0.15 A
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Test Circuit: Small-Signal Gain & Phase
43 1
Test Circuit: Stability
431 L
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Application Notes:
Stability: Selection of Load Capacitor
Selection of load capacitor for when B431L is used as a shunt regulator, two options for selection of CL 1) No load capacitance across the device, decouple at the load 2) Large capacitance across the device, optional decoupling at the load. The reason for this is that B431L exhibits instability with capacitances in the range of 10nF to 1F (approx.) at light cathode currents (up to 3mA typical). The device is less stable the lower the cathode voltage has been set for. Therefore while the device will be perfectly stable operating at a cathode current of 10mA with a 0.1F capacitor across it, it will oscillate transiently during start-up as the cathode current passes through the instability region. Selecting a very low (or preferably, no) capacitance, or alternatively a high capacitance such as 10F will avoid this issue altogether. Since the user anyway, the most cost effective method is to use no capacitance at all directly across the device. PCB trace/via resistance and inductance prevent the local load decoupling from causing the oscillation during the transient start-up phase. Note: if the B431L is located right at the load, so the load decoupling capacitor is directly across it, then this capacitor will have to be 1nF or 10F
B431
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Test Circuits:
Application Circuit:
+3.3V
0.1F
470F
+12V
PHD 3055E
500
2.7V
140 0.1F 0.1F B431L 120
0.1F
INTEL I 740
1000F
*If the output voltage has noise, then please add a 0.1F in between drain and gate of power MOSFET to reduce the noise. Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
B431L
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
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com

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