NSC LMV431IZ, LMV431IM5X, LMV431CZ, LMV431CM5X, LMV431CM5 Datasheet

January 2000

LMV431/LMV431A

Low-Voltage (1.24V) Adjustable Precision Shunt

Regulators

General Description

The LMV431and LMV431A 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 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 cathode to the adjust pin (voltage follower) provides a cathode voltage of a 1.24V.

The LMV431 and LMV431A have respective initial tolerances of 1.5% and 1%. Both grades are available in commercial and Industrial temperature ranges.

The LMV431 and LMV431A 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. The part is typically stable with capacitive loads greater than 10nF and less than 50 pF.

The LMV431 and LMV431A provide performance at a competitive price.

Features

nLow Voltage Operation/Wide Adjust Range (1.24V/30V)

n1% Initial Tolerance (LMV431A)

nTemperature Compensated for Industrial Temperature Range (39 PPM/ÊC for the LMV431AI)

nLow Operation Current (55µA)

nLow Output Impedance (0.25Ω)

nFast Turn-On Response

nLow Cost

Applications

nShunt Regulator

nSeries Regulator

nCurrent Source or Sink

nVoltage Monitor

nError Amplifier

n3V Off-Line Switching Regulator

nLow Dropout N-Channel Series Regulator

Connection Diagrams

TO92: Plastic Package

SOT23-5

DS100958-44

DS100958-1	Top View

Top View

Regulators Shunt Precision Adjustable 24V).(1 Voltage-Low LMV431/LMV431A

© 2000 National Semiconductor Corporation

DS100958

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LMV431/LMV431A

Symbol and Functional Diagrams

DS100958-59

DS100958-60

Simplified Schematic

DS100958-3

Ordering Information

Package	Temperature	Voltage Tolerance	Part Number	Package Marking	Drawing
	Range				Number
TO92	Industrial Range	1%	LMV431AIZ	LMV431AIZ
	−40ÊC to +85ÊC
		1.5%	LMV431IZ	LMV431IZ	Z03A
	Commerial Range	1%	LMV431ACZ	LMV431ACZ
	0ÊC to +70ÊC
		1.5%	LMV431CZ	LMV431CZ
SOT23-5	Industrial Range	1%	LMV431AIM5	N08A
	−40ÊC to +85ÊC
		1%	LMV431AIM5X	N08A
		1.5%	LMV431IM5	N08B
		1.5%	LMV431IM5X	N08B	MA05A
	Commercial Range	1%	LMV431ACM5	N09A
	0ÊC to +70ÊC
		1%	LMV431ACM5X	N09A
		1.5%	LMV431CM5	N09B
		1.5%	LMV431CM5X	N09B

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DC/AC Test Circuits for Table and Curves

DS100958-4 DS100958-5

FIGURE 1. Test Circuit for V	= V	REF	Note: VZ = VREF (1 + R1/R2) + IREF· R1
	Z		FIGURE 2. Test Circuit for VZ > VREF

DS100958-6

FIGURE 3. Test Circuit for Off-State Current

LMV431/LMV431A

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LMV431/LMV431A

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

	Storage Temperature Range	−65ÊC to +150ÊC
	Operating Temperature Range
	Industrial (LMV431AI, LMV431I)	−40ÊC to +85ÊC
	Commercial (LMV431AC, LMV431C)	0ÊC to +70ÊC
	Lead Temperature
	TO92 Package/SOT23 -5Package
	(Soldering, 10 sec.)	265ÊC
	Internal Power Dissipation (Note 2)	0.78W
	TO92
	SOT23-5 Package	0.28W
	Cathode Voltage	35V
	Continuous Cathode Current	−30 mA to +30mA
	Reference Input Current range	−.05mA to 3mA

Operating Conditions

Cathode Voltage	VREF to 30V
Cathode Current	0.1 mA to 15mA
Temperature range
LMV431AI	−40ÊC ≤ TA ≤ 85ÊC
Thermal Resistance (θJA)(Note 3)
SOT23-5 Package	455 ÊC/W
TO-92 Package	161 ÊC/W
Derating Curve (Slope = −1/ θJA)

DS100958-30

LMV431C Electrical Characteristics

TA = 25ÊC unless otherwise specified

Symbol	Parameter	Conditions			Min	Typ	Max		Units
VREF	Reference Voltage	VZ=VREF, IZ=10mA		TA = 25ÊC	1.222	1.24	1.258
		(See Figure 1 )		TA = Full Range	1.21		1.27		V
VDEV	Deviation of Reference Input Voltage	VZ= VREF, IZ=10mA,				4	12		mV
	Over Temperature (Note 4)	TA=Full Range (See Figure 1)
	Ratio of the Change in Reference	IZ = 10mA (see Figure 2 )				−1.5	−2.7		mV/V
	Voltage to the Change in Cathode	VZ from VREF to 6V
	Voltage	R1 = 10k, R2 = ∞ and 2.6K
IREF	Reference Input Current	R1 = 10kΩ, R2 = ∞				0.15	0.5		µA
		II = 10mA (see Figure 2)
IREF	Deviation of Reference Input Current	R1 = 10kΩ, R2 = ∞,				0.05	0.3		µA
	over Temperature	II = 10mA, TA = Full Range (see Figure 2)
IZ(MIN)	Minimum Cathode Current for	VZ = VREF (see Figure 1)				55	80		µA
	Regulation
IZ(OFF)	Off-State Current	VZ=6V, VREF = 0V (see Figure 3 )				0.001	0.1		µA
rZ	Dynamic Output Impedance (Note 5)	VZ = VREF, IZ = 0.1mA to 15mA
		Frequency = 0Hz (see Figure 1)				0.25	0.4		Ω

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LMV431I Electrical Characteristics

TA = 25ÊC unless otherwise specified

Symbol	Parameter	Conditions			Min	Typ	Max		Units
VREF	Reference Voltage	VZ=VREF, IZ=10mA		TA = 25ÊC	1.222	1.24	1.258		V
		(See Figure 1 )		TA = Full Range	1.202		1.278
VDEV	Deviation of Reference Input Voltage	VZ= VREF, IZ=10mA,				6	20		mV
	Over Temperature (Note 4)	TA=Full Range (See Figure 1)
	Ratio of the Change in Reference	IZ = 10mA (see Figure 2 )				−1.5	−2.7		mV/V
	Voltage to the Change in Cathode	VZ from VREF to 6V
	Voltage	R1 = 10k, R2 = ∞ and 2.6K
IREF	Reference Input Current	R1 = 10kΩ, R2 = ∞				0.15	0.5		µA
		II = 10mA (see Figure 2)
IREF	Deviation of Reference Input Current	R1 = 10kΩ, R2 = ∞,				0.1	0.4		µA
	over Temperature	II = 10mA, TA = Full Range (see Figure 2)
IZ(MIN)	Minimum Cathode Current for	VZ = VREF (see Figure 1)				55	80		µA
	Regulation
IZ(OFF)	Off-State Current	VZ=6V, VREF = 0V (see Figure 3 )				0.001	0.1		µA
rZ	Dynamic Output Impedance (Note 5)	VZ = VREF, IZ = 0.1mA to 15mA
		Frequency = 0Hz (see Figure 1)				0.25	0.4		Ω

LMV431AC Electrical Characteristics

TA = 25ÊC unless otherwise specified

Symbol	Parameter	Conditions			Min	Typ	Max		Units
VREF	Reference Voltage	VZ=VREF, IZ=10 mA		TA = 25ÊC	1.228	1.24	1.252		V
		(See Figure 1 )		TA = Full Range	1.221		1.259
VDEV	Deviation of Reference Input Voltage	VZ= VREF, IZ=10mA,				4	12		mV
	Over Temperature (Note 4)	TA=Full Range (See Figure 1)
	Ratio of the Change in Reference	IZ = 10 mA (see Figure 2 )				−1.5	−2.7	mV/V
	Voltage to the Change in Cathode	VZ from VREF to 6V
	Voltage	R1 = 10k, R2 = ∞ and 2.6K
IREF	Reference Input Current	R1 = 10 kΩ, R2 = ∞				0.15	0.50		µA
		II = 10 mA (see Figure 2)
IREF	Deviation of Reference Input Current	R1 = 10 kΩ, R2 = ∞,				0.05	0.3		µA
	over Temperature	II = 10 mA, TA = Full Range (see Figure 2)
IZ(MIN)	Minimum Cathode Current for	VZ = VREF (see Figure 1)				55	80		µA
	Regulation
IZ(OFF)	Off-State Current	VZ=6V, VREF = 0V (see Figure 3 )				0.001	0.1		µA
rZ	Dynamic Output Impedance (Note 5)	VZ = VREF, IZ = 0.1mA to 15mA
		Frequency = 0 Hz (see Figure 1)				0.25	0.4		Ω

LMV431/LMV431A

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