SNVS041F – MAY 2004 – REVISED MAY 2005
LMV431/LMV431A/LMV431B Low-Voltage (1.24V) Adjustable Precision Shunt Regulators
Check for Samples:
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FEATURES
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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
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
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.
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APPLICATIONS
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Shunt Regulator
Series Regulator
Current Source or Sink
Voltage Monitor
Error Amplifier
3V Off-Line Switching Regulator
Low Dropout N-Channel Series Regulator
Connection Diagram
*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.
Figure 1. TO-92: Plastic Package
Top View
ANODE
Figure 2. SOT-23-5
Top View
REF
CATHODE
Figure 3. SOT-23-3
Top View
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Copyright © 2004–2005, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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