LMV431 Low-Voltage (1.24V) Adjustable Precision Shunt Regulators | TI.com

LMV431 (ACTIVE) Low-Voltage (1.24V) Adjustable Precision Shunt Regulators

 

Recommended alternative parts

  • LM4120  -  Lower Supply Current, Lower Temperature Coefficient & Enable Pin
  • LM4128  -  Lower Supply Current, Lower Temperature Coefficient & Enable Pin
  • LM4132  -  Lower Supply Current, Lower Temperature Coefficient & Enable Pin
  • LM4050-N  -  Better Temperature Coefficient and Initial Accuracy

Description

The LMV431, LMV431A and LMV431B are precision 1.24 V shunt regulators capable of adjustment to 30 V. 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 1.24 V band-gap reference. Shorting the cathode to the adjust pin (voltage follower) provides a cathode voltage of a 1.24 V.

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

The LMV431, LMV431A and LMV431B provide performance at a competitive price.

Features

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

Parametrics

Compare all products in Shunt voltage references Email Download to Excel
Part number Order Reference voltage VO (V) VO adj (Min) (V) VO adj (Max) (V) Initial accuracy (Max) (%) Temp coeff (Max) (ppm/ degree C) Rating Operating temperature range (C) Iz for regulation (Min) (uA) Iout/Iz (Max) (mA) Package Group Iref (uA) I I(dev) (uA)
LMV431 Order now Adjustable     1.24     1.24     30     1.5     129
138    
Catalog     -40 to 85
0 to 70    
80     15     SOT-23 | 5
TO-92 | 3    
0.5     0.4    
LM431 Order now Adjustable     2.5     2.5     36     0.5
1
2    
97     Catalog     -40 to 85
0 to 70    
400     100     SOIC | 8
SOT-23 | 3
TO-92 | 3    
4     1.2    
TL431LI Order now Adjustable     2.495     2.495     36     0.5
1    
63     Catalog     -40 to 125
-40 to 85
0 to 70    
400     15     SOT-23 | 3     0.4     0.3