lmv431bcz National Semiconductor Corporation, lmv431bcz Datasheet

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lmv431bcz

Manufacturer Part Number
lmv431bcz
Description
Low-voltage 1.24v Adjustable Precision Shunt Regulators
Manufacturer
National Semiconductor Corporation
Datasheet
© 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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lmv431bcz Summary of contents

Page 1

... 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. Top View © 2003 National Semiconductor Corporation Features n Low Voltage Operation/Wide Adjust Range (1.24V/30V) n 0.5% Initial Tolerance (LMV431B) n Temperature Compensated for Industrial Temperature Range (39 PPM/˚C for the LMV431AI) n Low Operation Current (55µ ...

Page 2

Symbol and Functional Diagrams 10095859 Simplified Schematic www.national.com 2 10095860 10095803 ...

Page 3

... LMV431AIMF 1% LMV431AIMFX Note FIGURE 2. Test Circuit for REF 10095806 FIGURE 3. Test Circuit for Off-State Current 3 Package Marking NSC Drawing LMV431AIZ LMV431IZ LMV431BCZ Z03A LMV431ACZ LMV431CZ N08A N08A N08B N08B N09C MF05A N09C N09A N09A N09B N09B RLB MF03A RLA 10095805 • ...

Page 4

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Operating Temperature Range Industrial (LMV431AI, LMV431I) Commercial (LMV431AC, LMV431C, LMV431BC) Lead Temperature TO92 Package/SOT23 -5,-3 Package ...

Page 5

LMV431I Electrical Characteristics T = 25˚C unless otherwise specified A Symbol Parameter V Reference Voltage REF V Deviation of Reference Input Voltage DEV Over Temperature (Note 4) Ratio of the Change in Reference Voltage to the Change in Cathode Voltage ...

Page 6

LMV431AI Electrical Characteristics T = 25˚C unless otherwise specified A Symbol Parameter V Reference Voltage REF V Deviation of Reference Input Voltage DEV Over Temperature (Note 4) Ratio of the Change in Reference Voltage to the Change in Cathode Voltage ...

Page 7

LMV431BI Electrical Characteristics T = 25˚C unless otherwise specified A Symbol Parameter ∝ I Deviation of Reference Input Current REF over Temperature I Minimum Cathode Current for Z(MIN) Regulation I Off-State Current Z(OFF) r Dynamic Output Impedance (Note 5) Z ...

Page 8

LMV431BI Electrical Characteristics The average temperature coefficient of the reference input voltage, ∝ V Where: T − full temperature change ∝ V can be positive or negative depending on whether the slope is positive or negative. ...

Page 9

Typical Performance Characteristics Reference Voltage vs. Junction Temperature Cathode Current vs. Cathode Voltage 1 Off-State Cathode Current vs. Junction Temperature Reference Input Current vs. Junction Temperature 10095850 Cathode Current vs. Cathode Voltage 2 10095851 Delta Reference Voltage Per Delta Cathode ...

Page 10

Typical Performance Characteristics Input Voltage Noise vs. Frequency Low Frequency Peak to Peak Noise Small Signal Voltage Gain and Phase Shift vs. Frequency www.national.com (Continued) 10095853 Test Circuit for Input Voltage Noise vs. Frequency 10095854 Test Circuit for Peak to ...

Page 11

Typical Performance Characteristics Reference Impedance vs. Frequency Pulse Response 1 Pulse Response 2 (Continued) Test Circuit for Reference Impedance vs. Frequency 10095856 Test Circuit for Pulse Response 1 10095857 Test Circuit for Pulse Response 2 10095858 11 10095847 10095848 10095849 ...

Page 12

Typical Performance Characteristics Test circuit for V Z Percentage Change in V Extrapolated from life-test data taken at 125˚C; the activation energy assumed is 0.7eV. www.national.com (Continued) LMV431 Stability Boundary Condition 10095869 = V REF vs. Operating Life at 55˚C ...

Page 13

Typical Applications Series Regulator Higher Current Shunt Regulator Over Voltage/Under VoltageProtection Circuit Output Control of a Three Terminal Fixed Regulator 10095816 10095818 10095820 13 10095817 Crow Bar 10095819 Voltage Monitor 10095821 www.national.com ...

Page 14

Typical Applications Delay Timer www.national.com (Continued) 10095822 Constant Current Sink 14 Current Limiter or Current Source 10095823 10095824 ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted SOT23-5 Molded Small Outline Transistor Package (M5) SOT23-3 Molded Small Outline Transistor Package (M3) NS Package Number MF05A NS Package Number MF03A 15 www.national.com ...

Page 16

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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