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Description: The LMV431, LMV431A and LMV431B are precision 1.24V shunt regulators capable of adjustment to 30V. Negative feedback fr...


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LMV431B General Description


The LMV431, LMV431A and LMV431B are precision 1.24V shunt regulators capable of adjustment to 30V. Negative feedback from the cathode to the adjust pin controls the cathode voltage, much like a non-inverting op amp configuration (Refer to Symbol and Functional diagrams). A two resistor voltage divider terminated at the adjust pin controls the gain of a 1.24V band-gap reference. Shorting the cathode to the adjust pin (voltage follower) provides a cathode voltage of a 1.24V.

The LMV431, LMV431A and LMV431B have respective initial tolerances of 1.5%, 1% and 0.5%, and functionally lends themselves to several applications that require zener diode type performance at low voltages. Applications include a 3V to 2.7V low drop-out regulator, an error amplifier in a 3V off-line switching regulator and even as a voltage detector. These parts are typically stable with capacitive loads greater than 10nF and less than 50pF. The LMV431, LMV431A and LMV431B provide performance at a competitive price.

LMV431B Maximum Ratings

Storage Temperature Range                                                −65˚C to +150˚C
Operating Temperature Range
Industrial (LMV431AI, LMV431I)                                             −40˚C to +85˚C
Commercial (LMV431AC, LMV431C, LMV431BC)                          0˚C to +70˚C
Lead Temperature
TO92 Package/SOT23 -5,-3 Package
(Soldering, 10 sec.)                                                                               265˚C
Internal Power Dissipation (Note 2)
TO92
0.78W
SOT23-5, -3 Package                                                                           0.28W
Cathode Voltage 35V
Continuous Cathode Current                                            −30 mA to +30mA
Reference Input Current range                                             −.05mA to 3mA

LMV431B Features

Low Voltage Operation/Wide Adjust Range (1.24V/30V)
0.5% Initial Tolerance (LMV431B)
Temperature Compensated for Industrial Temperature
Range (39 PPM/˚C for the LMV431AI)
Low Operation Current (55µA)
Low Output Impedance (0.25Ω)
Fast Turn-On Response
Low Cost

LMV431B Typical Application

Shunt Regulator
Series Regulator
Current Source or Sink
Voltage Monitor
Error Amplifier
3V Off-Line Switching Regulator
Low Dropout N-Channel Series Regulator

LMV431B Connection Diagram

LMV431B  Connection Diagram

LMV431B datasheet

LMV431B
PDF/DataSheet Download

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  • LMV431A

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    The LMV431, LMV431A and LMV431B are precision 1.24V shunt regulators capable of adjustment to 30V. Negative feedback from the cathode to the adjust pin controls the cathode voltage, much like a non-inverting op amp configuration (Refer to Symbol and Function...

  • LMV431

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