View NSC05107_994094.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LMV431/LMV431A Low-Voltage (1.24V) Adjustable Precision Shunt Regulators
June 1999
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
n Low Voltage Operation/Wide Adjust Range (1.24V/30V) n 1% Initial Tolerance (LMV431A) n Temperature Compensated for Industrial Temperature Range (39 PPM/C for the LMV431AI) n Low Operation Current (55A) n Low Output Impedance (0.25) n Fast Turn-On Response n Low Cost
Applications
n n n n n n n Shunt Regulator Series Regulator Current Source or Sink Voltage Monitor Error Amplifier 3V Off-Line Switching Regulator Low Dropout N-Channel Series Regulator
Connection Diagrams
TO92: Plastic Package SOT23-5
DS100958-44 DS100958-1
Top View Order Number LMV431AIZ, LMV431IZ, LMV431ACZ, LMV431CZ
Top View Order Number LMV431AIM5, LMV431IM5, LMV431ACM5, LMV431CM5
(c) 1999 National Semiconductor Corporation
DS100958
www.national.com
Symbol and Functional Diagrams
DS100958-59
DS100958-60
Simplified Schematic
DS100958-3
Ordering Information
Package TO92 Temperature Range Industrial Range -40C to +85C Commerial Range 0C to + 70C SOT23-5 Industrial Range -40C to +80C Voltage Tolerance 1% 1.5% 1% 1.5% 1% 1% 1.5% 1.5% Commercial Range 0C to + 70C 1% 1% 1.5% 1.5% Part Number LMV431AIZ LMV431IZ LMV431ACZ LMV431CZ LMV431AIM5 LMV431AIM5X LMV431IM5 LMV431IM5X LMV431ACM5 LMV431ACM5X LMV431CM5 LMV431CM5X Package Marking LMV431AIZ LMV431IZ LMV431ACZ LMV431CZ N08A N08A N08B N08B N09A N09A N09B N09B MA05A Z03A Drawing Number
www.national.com
2
DC/AC Test Circuits for Table and Curves
DS100958-4
DS100958-5
FIGURE 1. Test Circuit for VZ = VREF
Note:
VZ = VREF (1 + R1/R2) + IREF * R1
FIGURE 2. Test Circuit for VZ > VREF
DS100958-6
FIGURE 3. Test Circuit for Off-State Current
3
www.national.com
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 Operating Temperature Range Industrial (LMV431AI, LMV431I) Commercial (LMV431AC, LMV431C) Lead Temperature TO92 Package/SOT23 -5Package (Soldering, 10 sec.) Internal Power Dissipation (Note 2) TO92 SOT23-5 Package Cathode Voltage Continuous Cathode Current Reference Input Current range -65C to +150C -40C to +85C 0C to +70C
Operating Conditions
Cathode Voltage Cathode Current Temperature range LMV431AI Thermal Resistance (JA)(Note 3) SOT23-5 Package TO-92 Package Derating Curve (Slope = -1/JA) VREF to 30V 0.1 mA to 15mA -40C TA 85C 455 C/W 161 C/W
265C 0.78W 0.28W 35V -30 mA to +30 mA -.05mA to 3 mA
DS100958-30
LMV431C Electrical Characteristics
TA = 25C unless otherwise specified Symbol VREF VDEV Parameter Reference Voltage Deviation of Reference Input Voltage Over Temperature (Note 4) Ratio of the Change in Reference Voltage to the Change in Cathode Voltage IREF IREF Reference Input Current Deviation of Reference Input Current over Temperature Minimum Cathode Current for Regulation Off-State Current Dynamic Output Impedance (Note 5) Conditions TA = Full Range VZ = VREF, IZ = 10mA, TA = Full Range (See Figure 1) IZ = 10 mA (see Figure 2 ) VZ from VREF to 6V R1 = 10k, R2 = and 2.6K R1 = 10 k, R2 = II = 10 mA (see Figure 2) R1 = 10 k, R2 = , II = 10 mA, TA = Full Range (see Figure 2) VZ = VREF (see Figure 1) VZ = 6V, VREF = 0V (see Figure 3 ) VZ = VREF, IZ = 0.1mA to 15mA Frequency = 0 Hz (see Figure 1) VZ = VREF, IZ = 10 mA (See Figure 1 ) TA = 25C Min 1.222 1.21 4 -1.5 Typ 1.24 Max 1.258 1.27 12 -2.7 V mV mV/V Units
0.15
0.5
A
0.05 55 0.001 0.25
0.3 80 0.1 0.4
A A A
IZ(MIN) IZ(OFF) rZ
www.national.com
4
LMV431I Electrical Characteristics
TA = 25C unless otherwise specified Symbol VREF VDEV Parameter Reference Voltage Deviation of Reference Input Voltage Over Temperature (Note 4) Ratio of the Change in Reference Voltage to the Change in Cathode Voltage IREF IREF Reference Input Current Deviation of Reference Input Current over Temperature Minimum Cathode Current for Regulation Off-State Current Dynamic Output Impedance (Note 5) Conditions VZ = VREF, IZ = 10 mA (See Figure 1 ) TA = 25C TA = Full Range Min 1.222 1.202 6 -1.5 Typ 1.24 Max 1.258 1.278 20 -2.7 Units V mV mV/V
IZ(MIN) IZ(OFF) rZ
VZ = VREF, IZ = 10mA, TA = Full Range (See Figure 1) IZ = 10 mA (see Figure 2 ) VZ from VREF to 6V R1 = 10k, R2 = and 2.6K R1 = 10 k, R2 = II = 10 mA (see Figure 2) R1 = 10 k, R2 = , II = 10 mA, TA = Full Range (see Figure 2) VZ = VREF (see Figure 1) VZ = 6V, VREF = 0V (see Figure 3 ) VZ = VREF, IZ = 0.1mA to 15mA Frequency = 0 Hz (see Figure 1)
0.15
0.5
A
0.1
0.4
A
55 0.001 0.25
80 0.1 0.4
A A
LMV431AC Electrical Characteristics
TA = 25C unless otherwise specified Symbol VREF VDEV Parameter Reference Voltage Deviation of Reference Input Voltage Over Temperature (Note 4) Ratio of the Change in Reference Voltage to the Change in Cathode Voltage IREF IREF Reference Input Current Deviation of Reference Input Current over Temperature Minimum Cathode Current for Regulation Off-State Current Dynamic Output Impedance (Note 5) Conditions VZ = VREF, IZ = 10 mA (See Figure 1 ) TA = 25C TA = Full Range Min 1.228 1.221 4 -1.5 Typ 1.24 Max 1.252 1.259 12 -2.7 Units V mV mV/V
IZ(MIN) IZ(OFF) rZ
VZ = VREF, IZ = 10mA, TA = Full Range (See Figure 1) IZ = 10 mA (see Figure 2 ) VZ from VREF to 6V R1 = 10k, R2 = and 2.6K R1 = 10 k, R2 = II = 10 mA (see Figure 2) R1 = 10 k, R2 = , II = 10 mA, TA = Full Range (see Figure 2) VZ = VREF (see Figure 1) VZ = 6V, VREF = 0V (see Figure 3 ) VZ = VREF, IZ = 0.1mA to 15mA Frequency = 0 Hz (see Figure 1)
0.15
0.50
A
0.05
0.3
A
55 0.001 0.25
80 0.1 0.4
A A
5
www.national.com
LMV431AI Electrical Characteristics
TA = 25C unless otherwise specified Symbol VREF VDEV Parameter Reference Voltage Deviation of Reference Input Voltage Over Temperature (Note 4) Ratio of the Change in Reference Voltage to the Change in Cathode Voltage IREF IREF Reference Input Current Deviation of Reference Input Current over Temperature Minimum Cathode Current for Regulation Off-State Current Dynamic Output Impedance (Note 5) Conditions TA = Full Range VZ = VREF, IZ = 10mA, TA = Full Range (See Figure 1) IZ = 10 mA (see Figure 2 ) VZ from VREF to 6V R1 = 10k, R2 = and 2.6K R1 = 10 k, R2 = II = 10 mA (see Figure 2) R1 = 10 k, R2 = , II = 10 mA, TA = Full Range (see Figure 2) VZ = VREF (see Figure 1) VZ = 6V, VREF = 0V (see Figure 3 ) VZ = VREF, IZ = 0.1mA to 15mA Frequency = 0 Hz (see Figure 1) VZ = VREF, IZ = 10 mA (See Figure 1 ) TA = 25C Min 1.228 1.215 6 -1.5 Typ 1.24 Max 1.252 1.265 20 -2.7 V mV mV/V Units
0.15
0.5
A
0.1
0.4
A
IZ(MIN) IZ(OFF) rZ
55 0.001 0.25
80 0.1 0.4
A A
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2: Ratings apply to ambient temperature at 25C. Above this temperature, derate the TO92 at 6.2 mW/C, and the SOT23-5 at 2.2 mW/C. See derating curve in Operating Condition section.. Note 3: TJ Max = 150C, TJ = TA+ (JA PD), where PD is the operating power of the device. Note 4: Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference input voltage over the full temperature range. See following:
www.national.com
6
LMV431AI Electrical Characteristics
(Continued)
DS100958-7
The average temperature coefficient of the reference input voltage, VREF, is defined as:
Where: T2 - T1 = full temperature change. VREF can be positive or negative depending on whether the slope is positive or negative. Example: VDEV = 6.0mV, REF = 1240mV, T2 - T1 = 125C.
Note 5: The dynamic output impedance, rZ, is defined as:
When the device is programmed with two external resistors, R1 and R2, (see Figure 2 ), the dynamic output impedance of the overall circuit, rZ, is defined as:
7
www.national.com
Typical Performance Characteristics
Reference Voltage vs Junction Temperature Reference Input Current vs Junction Temperature
DS100958-50
DS100958-62
Cathode Current vs Cathode Voltage 1
Cathode Current vs Cathode Voltage 2
DS100958-52
DS100958-51
Off-State Cathode Current vs Junction Temperature
Delta Reference Voltage Per Delta Cathode Voltage vs Junction Temperature
DS100958-63
DS100958-61
www.national.com
8
Typical Performance Characteristics
Input Voltage Noise vs Frequency
(Continued)
DS100958-45 DS100958-53
Test Circuit for Input Voltage Noise vs Frequency
Low Frequency Peak to Peak Noise
DS100958-54
DS100958-64
Test Circuit for Peak to Peak Noise (BW = 0.1Hz to 10Hz) Small Signal Voltage Gain and Phase Shift vs Frequency
DS100958-46
Test Circuit For Voltage Gain and Phase Shift vs Frequency
DS100958-55
9
www.national.com
Typical Performance Characteristics
Reference Impedance vs Frequency
(Continued)
DS100958-47
Test Circuit For Reference Impedance vs Frequency
DS100958-56
Pulse Response 1
DS100958-48
Test Circuit for Pulse Response 1
DS100958-57
Pulse Response 2
DS100958-49
Test Circuit for Pulse Response 2
DS100958-58
www.national.com
10
Typical Performance Characteristics
(Continued)
Percentage Change in VREF vs Operating Life at 55C
DS100958-66
Extrapolated from life-test data taken at 125C; the activation energy assumed is 0.7eV.
11
www.national.com
Typical Applications
Series Regulator Output Control of a Three Terminal Fixed Regulator
DS100958-16 DS100958-17
Higher Current Shunt Regulator
Crow Bar
DS100958-18
DS100958-19
Over Voltage/Under Voltage Protection Circuit
DS100958-20
www.national.com
12
Typical Applications
(Continued) Voltage Monitor
DS100958-21
Delay Timer
Current Limiter or Current Source
DS100958-23
DS100958-22
Constant Current Sink
DS100958-24
13
www.national.com
Physical Dimensions
inches (millimeters) unless otherwise noted
SOT23-5 Molded Small Outline Transistor Package (M5) Order Number LMV431AIM5, LMV431AIM5X, NS Package Number MA05A
www.national.com
14
LMV431/LMV431A Low-Voltage (1.24V) Adjustable Precision Shunt Regulators
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Order Number LMV431AIZ, LMV431AIZX, NS Package Number Z03A
LIFE SUPPORT POLICY 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 into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Francais Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com
National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

▲Up To Search▲

Price & Availability of NSC05107

	To Download NSC05107 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .