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LMV431ACM5-LMV431ACM5X-LMV431ACM5X--LMV431AIM5-LMV431AIM5X-LMV431AIMF-LMV431AIMFX-LMV431AIZ-LMV431BCM5-LMV431BCM5X-LMV431BIMF-LMV431BIMFX-LMV431CM5-LMV431CM5X-LMV431CZ-LMV431IM5-LMV431IM5X
Low-Voltage (1.24V) Adjustable Precision Shunt Regulators
LMV431/LMV431A/LMV431B
Low-Voltage (1.24V) Adjustable Precision Shunt
Regulators
General DescriptionThe LMV431, LMV431A and LMV431Bare precision 1.24V
shunt regulators capableof adjustmentto 30V. Negative
feedback from the cathodeto the adjust pin controls the
cathode voltage, much likea non-invertingop amp configu-
ration (Referto Symbol and Functional diagrams).A two
resistor voltage divider terminatedatthe adjustpin controls
the gainofa 1.24V band-gap reference. Shorting the cath-
odeto the adjustpin (voltage follower) providesa cathode
voltageofa 1.24V.
The LMV431, LMV431A and LMV431B have respectiveini-
tial tolerancesof 1.5%,1% and 0.5%, and functionally lends
themselvesto several applications that require zener diode
type performanceat low voltages. Applications includea3V 2.7V low drop-out regulator,an error amplifierina 3V
off-line switching regulator and evenasa voltage detector.
These partsare typically stable with capacitive loads greater
than 10nF and less than 50pF.
The LMV431, LMV431A and LMV431B provide performancea competitive price.
Features Low Voltage Operation/Wide Adjust Range (1.24V/30V) 0.5% Initial Tolerance (LMV431B) Temperature Compensatedfor Industrial Temperature
Range (39 PPM/˚Cfor the LMV431AI) Low Operation Current (55µA) Low Output Impedance (0.25Ω) Fast Turn-On Response Low Cost
Applications Shunt Regulator Series Regulator Current Sourceor Sink Voltage Monitor Error Amplifier3V Off-Line Switching Regulator Low Dropout N-Channel Series Regulator
Connection Diagrams
TO92: Plastic PackageTop View
SOT23-5
*Pin1isnot internally connected.
*Pin2is internally connectedto Anodepin.Pin2 shouldbe either floating connectedto Anodepin.
Top View
SOT23-3Top View
August 2003
LMV431/LMV431A/LMV431B
Low-V
oltage
(1.24V)
Adjustable
Precision
Shunt
Regulators
