LMV431BCM5X NSC [National Semiconductor], LMV431BCM5X Datasheet

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LMV431BCM5X

Manufacturer Part Number
LMV431BCM5X
Description
Low-Voltage (1.24V) Adjustable Precision Shunt
Manufacturer
NSC [National Semiconductor]
Datasheets

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© 2003 National Semiconductor Corporation
LMV431/LMV431A/LMV431B
Low-Voltage (1.24V) Adjustable Precision Shunt
Regulators
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 configu-
ration (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 cath-
ode to the adjust pin (voltage follower) provides a cathode
voltage of a 1.24V.
The LMV431, LMV431A and LMV431B have respective ini-
tial 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.
Connection Diagrams
*
*
or connected to Anode pin.
Pin 1 is not internally connected.
Pin 2 is internally connected to Anode pin. Pin 2 should be either floating
TO92: Plastic Package
Top View
Top View
SOT23-5
10095844
DS100958
10095801
Features
n Low Voltage Operation/Wide Adjust Range (1.24V/30V)
n 0.5% Initial Tolerance (LMV431B)
n Temperature Compensated for Industrial Temperature
n Low Operation Current (55µA)
n Low Output Impedance (0.25Ω)
n Fast Turn-On Response
n Low Cost
Applications
n Shunt Regulator
n Series Regulator
n Current Source or Sink
n Voltage Monitor
n Error Amplifier
n 3V Off-Line Switching Regulator
n Low Dropout N-Channel Series Regulator
Range (39 PPM/˚C for the LMV431AI)
Top View
SOT23-3
10095867
www.national.com
August 2003

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