LMV431B

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0.5%, low-voltage (1.24-V) adjustable precision shunt regulator

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Data sheet

document-pdfAcrobat LMV431l;LMV431Al;LMV431B Low-Voltage (1.24V) Adj Precision Shunt Regs datasheet (Rev. G)

LMV431B

ACTIVE

Data sheet

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Product details

VO (V)

1.24

Initial accuracy (max) (%)

0.5

VO adj (min) (V)

1.24

VO adj (max) (V)

30

Iz for regulation (min) (µA)

80

Reference voltage (V)

adjustable

Rating

Catalog

Temp coeff (max) (ppm/°C)

138

Operating temperature range (°C)

-40 to 85

Iout/Iz (max) (mA)

15

VO (V)

1.24

Initial accuracy (max) (%)

0.5

VO adj (min) (V)

1.24

VO adj (max) (V)

30

Iz for regulation (min) (µA)

80

Reference voltage (V)

adjustable

Rating

Catalog

Temp coeff (max) (ppm/°C)

138

Operating temperature range (°C)

-40 to 85

Iout/Iz (max) (mA)

15

SOT-23 (DBV)

5

8.12 mm² 2.9 x 2.8

SOT-23 (DBZ)

3

6.9204 mm² 2.92 x 2.37

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

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

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.

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.

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	Type	Title		Date
*	Data sheet	LMV431l;LMV431Al;LMV431B Low-Voltage (1.24V) Adj Precision Shunt Regs datasheet (Rev. G)		22 Sep 2014
	E-book	Voltage Supervisor and Reset ICs: Tips, Tricks and Basics		28 Jun 2019

Design & development

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SHUNT-REFERENCE-CALC — Shunt Reference Selector and Design Calculator

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