LMV431 Datasheet | National Semiconductor

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 10n F and less than 50p F. The LMV431, LMV431A and LMV431B provide performance at a petitive price. Features n Low Voltage Operation/Wide Adjust Range (1.24V/30V) n 0.5% Initial Tolerance (LMV431B) n Temperature pensated for Industrial Temperature Range (39 PPM/˚C for the LMV431AI) n Low Operation Current (55µA) n Low Output Impedance (0.25Ω) n Fast Turn-On Response n Low Cost Applications n n n n n n n Shunt Regulator Series Regulator Current Source or Sink Voltage Monitor Error Amplifier 3V Off-Line Switching Regulator Low Dropout N-Channel Series Regulator Connection Diagrams TO92: Plastic Package SOT23-3 Top View SOT23-5 Top View - Pin 1 is not internally connected. - Pin 2 is internally connected to Anode pin. Pin 2 should be either floating or connected to Anode pin. Top View © 2003 National Semiconductor Corporation DS100958 .national. LMV431/LMV431A/LMV431B Symbol and Functional Diagrams Simplified Schematic .national. LMV431/LMV431A/LMV431B Ordering Information Package Temperature Range...