NSC LMV431B Low-voltage (1.24v) adjustable precision shunt regulator Datasheet

LMV431/LMV431A/LMV431B
Low-Voltage (1.24V) Adjustable Precision Shunt
Regulators
General Description
Features
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 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, LMV431A and LMV431B have respective initial 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.
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 (55µA)
n Low Output Impedance (0.25Ω)
n Fast Turn-On Response
n Low Cost
The LMV431, LMV431A and LMV431B provide performance
at a competitive price.
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
SOT23-3
10095801
Top View
10095867
SOT23-5
Top View
10095844
*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
DS100958
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LMV431/LMV431A/LMV431B Low-Voltage (1.24V) Adjustable Precision Shunt Regulators
August 2003
LMV431/LMV431A/LMV431B
Symbol and Functional Diagrams
10095859
10095860
Simplified Schematic
10095803
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2
Package
Temperature
Range
Voltage Tolerance
Part Number
Package Marking
LMV431AIZ
Industrial Range
−40˚C to +85˚C
TO92
Commerial Range
0˚C to +70˚C
Industrial Range
−40˚C to +85˚C
SOT23-5
Commercial Range
0˚C to +70˚C
SOT23-3
Industrial Range
−40˚ to +85˚C
1%
LMV431AIZ
1.5%
LMV431IZ
LMV431IZ
0.5%
LMV431BCZ
LMV431BCZ
1%
LMV431ACZ
LMV431ACZ
1.5%
LMV431CZ
LMV431CZ
1%
LMV431AIM5
N08A
1%
LMV431AIM5X
N08A
1.5%
LMV431IM5
N08B
1.5%
LMV431IM5X
N08B
0.5%
LMV431BCM5
N09C
0.5%
LMV431BCM5X
N09C
1%
LMV431ACM5
N09A
1%
LMV431ACM5X
N09A
1.5%
LMV431CM5
N09B
1.5%
LMV431CM5X
N09B
0.5%
LMV431BIMF
0.5%
LMV431BIMFX
1%
LMV431AIMF
1%
LMV431AIMFX
NSC Drawing
Z03A
MF05A
RLB
MF03A
RLA
DC/AC Test Circuits for Table and
Curves
10095805
Note: VZ = VREF (1 + R1/R2) + IREF • R1
FIGURE 2. Test Circuit for VZ > VREF
10095804
FIGURE 1. Test Circuit for VZ = VREF
10095806
FIGURE 3. Test Circuit for Off-State Current
3
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LMV431/LMV431A/LMV431B
Ordering Information
LMV431/LMV431A/LMV431B
Absolute Maximum Ratings
Cathode Current
(Note 1)
Temperature range
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
−65˚C to +150˚C
−40˚C to +85˚C
Commercial (LMV431AC,
LMV431C, LMV431BC)
−40˚C ≤ TA ≤ 85˚C
LMV431AI
Thermal Resistance (θJA)(Note 3)
Operating Temperature Range
Industrial (LMV431AI, LMV431I)
0.1 mA to 15mA
SOT23-5, -3 Package
455 ˚C/W
TO-92 Package
161 ˚C/W
Derating Curve (Slope = −1/θJA)
0˚C to +70˚C
Lead Temperature
TO92 Package/SOT23 -5,-3 Package
(Soldering, 10 sec.)
265˚C
Internal Power Dissipation (Note 2)
TO92
0.78W
SOT23-5, -3 Package
0.28W
Cathode Voltage
35V
Continuous Cathode Current
−30 mA to +30mA
Reference Input Current range
−.05mA to 3mA
10095830
Operating Conditions
Cathode Voltage
VREF to 30V
LMV431C Electrical Characteristics
TA = 25˚C unless otherwise specified
Symbol
VREF
VDEV
Parameter
Reference Voltage
Conditions
VZ = VREF, IZ = 10mA
(See Figure 1 )
Min
Typ
Max
TA = 25˚C
1.222
1.24
1.258
TA = Full Range
1.21
Deviation of Reference Input Voltage
Over Temperature (Note 4)
VZ = VREF, IZ = 10mA,
TA = Full Range (See Figure 1)
Ratio of the Change in Reference
Voltage to the Change in Cathode
Voltage
IZ = 10mA (see Figure 2 )
VZ from VREF to 6V
R1 = 10k, R2 = ∞ and 2.6k
Reference Input Current
R1 = 10kΩ, R2 = ∞
II = 10mA (see Figure 2)
Deviation of Reference Input Current
over Temperature
R1 = 10kΩ, R2 = ∞,
II = 10mA, TA = Full Range (see Figure 2)
IZ(MIN)
Minimum Cathode Current for
Regulation
VZ = VREF (see Figure 1)
IZ(OFF)
Off-State Current
rZ
Dynamic Output Impedance (Note 5)
IREF
∝IREF
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Units
1.27
V
4
12
mV
−1.5
−2.7
mV/V
0.5
µA
0.15
0.05
0.3
µA
55
80
µA
VZ =6V, VREF = 0V (see Figure 3 )
0.001
0.1
µA
VZ = VREF, IZ = 0.1mA to 15mA
Frequency = 0Hz (see Figure 1)
0.25
0.4
Ω
4
Symbol
VREF
VDEV
Parameter
Reference Voltage
Conditions
VZ = VREF, IZ = 10mA
(See Figure 1 )
Min
Typ
Max
TA = 25˚C
1.222
1.24
1.258
TA = Full Range
1.202
Deviation of Reference Input Voltage
Over Temperature (Note 4)
VZ = VREF, IZ = 10mA,
TA = Full Range (See Figure 1)
Ratio of the Change in Reference
Voltage to the Change in Cathode
Voltage
IZ = 10mA (see Figure 2 )
VZ from VREF to 6V
R1 = 10k, R2 = ∞ and 2.6k
Reference Input Current
R1 = 10kΩ, R2 = ∞
II = 10mA (see Figure 2)
Deviation of Reference Input Current
over Temperature
R1 = 10kΩ, R2 = ∞,
II = 10mA, TA = Full Range (see Figure 2)
IZ(MIN)
Minimum Cathode Current for
Regulation
VZ = VREF (see Figure 1)
IZ(OFF)
Off-State Current
rZ
Dynamic Output Impedance (Note 5)
IREF
∝IREF
1.278
Units
V
6
20
mV
−1.5
−2.7
mV/V
0.15
0.5
µA
0.1
0.4
µA
55
80
µA
VZ = 6V, VREF = 0V (see Figure 3 )
0.001
0.1
µA
VZ = VREF, IZ = 0.1mA to 15mA
Frequency = 0Hz (see Figure 1)
0.25
0.4
Ω
Units
LMV431AC Electrical Characteristics
TA = 25˚C unless otherwise specified
Symbol
VREF
VDEV
Parameter
Reference Voltage
Conditions
VZ = VREF, IZ = 10 mA
(See Figure 1 )
Min
Typ
Max
TA = 25˚C
1.228
1.24
1.252
TA = Full Range
1.221
Deviation of Reference Input Voltage
Over Temperature (Note 4)
VZ = VREF, IZ = 10mA,
TA = Full Range (See Figure 1)
Ratio of the Change in Reference
Voltage to the Change in Cathode
Voltage
IZ = 10 mA (see Figure 2 )
VZ from VREF to 6V
R1 = 10k, R2 = ∞ and 2.6k
Reference Input Current
R1 = 1 kΩ, R2 = ∞
II = 10 mA (see Figure 2)
Deviation of Reference Input Current
over Temperature
R1 = 10 kΩ, R2 = ∞,
II = 10 mA, TA = Full Range (see Figure 2)
IZ(MIN)
Minimum Cathode Current for
Regulation
VZ = VREF (see Figure 1)
IZ(OFF)
Off-State Current
rZ
Dynamic Output Impedance (Note 5)
IREF
∝IREF
1.259
V
4
12
mV
−1.5
−2.7
mV/V
0.15
0.50
µA
0.05
0.3
µA
55
80
µA
VZ = 6V, VREF = 0V (see Figure 3 )
0.001
0.1
µA
VZ = VREF, IZ = 0.1mA to 15mA
Frequency = 0 Hz (see Figure 1)
0.25
0.4
Ω
5
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LMV431/LMV431A/LMV431B
LMV431I Electrical Characteristics
TA = 25˚C unless otherwise specified
LMV431/LMV431A/LMV431B
LMV431AI Electrical Characteristics
TA = 25˚C unless otherwise specified
Symbol
Parameter
Conditions
Min
Typ
Max
TA = 25˚C
1.228
1.24
1.252
TA = Full Range
1.215
VREF
Reference Voltage
VZ = VREF, IZ = 10mA
(See Figure 1 )
VDEV
Deviation of Reference Input Voltage
Over Temperature (Note 4)
VZ = VREF, IZ = 10mA,
TA = Full Range (See Figure 1)
Ratio of the Change in Reference
Voltage to the Change in Cathode
Voltage
IZ = 10mA (see Figure 2 )
VZ from VREF to 6V
R1 = 10k, R2 = ∞ and 2.6k
IREF
Reference Input Current
R1 = 10kΩ, R2 = ∞
II = 10mA (see Figure 2)
∝IREF
Deviation of Reference Input Current
over Temperature
R1 = 10kΩ, R2 = ∞,
II = 10mA, TA = Full Range (see Figure 2)
IZ(MIN)
Minimum Cathode Current for
Regulation
VZ = VREF (see Figure 1)
IZ(OFF)
Off-State Current
rZ
Dynamic Output Impedance (Note 5)
Units
1.265
V
6
20
mV
−1.5
−2.7
mV/V
0.15
0.5
µA
0.1
0.4
µA
55
80
µA
VZ = 6V, VREF = 0V (see Figure 3 )
0.001
0.1
µA
VZ = VREF, IZ = 0.1mA to 15mA
Frequency = 0Hz (see Figure 1)
0.25
0.4
Ω
Units
LMV431BC Electrical Characteristics
TA = 25˚C unless otherwise specified
Symbol
VREF
VDEV
Parameter
Reference Voltage
Conditions
VZ = VREF, IZ = 10mA
(See Figure 1 )
Min
Typ
Max
TA = 25˚C
1.234
1.24
1.246
TA = Full Range
1.227
Deviation of Reference Input Voltage
Over Temperature (Note 4)
VZ = VREF, IZ = 10mA,
TA = Full Range (See Figure 1)
Ratio of the Change in Reference
Voltage to the Change in Cathode
Voltage
IZ = 10mA (see Figure 2 )
VZ from VREF to 6V
R1 = 10k, R2 = ∞ and 2.6k
IREF
Reference Input Current
R1 = 10kΩ, R2 = ∞
II = 10mA (see Figure 2)
∝IREF
Deviation of Reference Input Current
over Temperature
R1 = 10kΩ, R2 = ∞,
II = 10mA, TA = Full Range (see Figure 2)
IZ(MIN)
Minimum Cathode Current for
Regulation
VZ = VREF (see Figure 1)
IZ(OFF)
Off-State Current
rZ
Dynamic Output Impedance (Note 5)
1.253
V
4
12
mV
−1.5
−2.7
mV/V
0.15
0.50
µA
0.05
0.3
µA
55
80
µA
VZ = 6V, VREF = 0V (see Figure 3 )
0.001
0.1
µA
VZ = VREF, IZ = 0.1mA to 15mA
Frequency = 0Hz (see Figure 1)
0.25
0.4
Ω
Units
LMV431BI Electrical Characteristics
TA = 25˚C unless otherwise specified
Symbol
VREF
VDEV
IREF
Parameter
Reference Voltage
Conditions
VZ = VREF, IZ = 10mA
(See Figure 1 )
Min
Typ
Max
TA = 25˚C
1.234
1.24
1.246
TA = Full Range
1.224
Deviation of Reference Input Voltage
Over Temperature (Note 4)
VZ = VREF, IZ = 10mA,
TA = Full Range (See Figure 1)
Ratio of the Change in Reference
Voltage to the Change in Cathode
Voltage
IZ = 10mA (see Figure 2 )
VZ from VREF to 6V
R1 = 10k, R2 = ∞ and 2.6k
Reference Input Current
R1 = 10kΩ, R2 = ∞
II = 10mA (see Figure 2)
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1.259
V
6
20
mV
−1.5
−2.7
mV/V
0.15
0.50
µA
(Continued)
TA = 25˚C unless otherwise specified
Symbol
∝IREF
Parameter
Conditions
Typ
Max
Units
0.1
0.4
µA
55
80
µA
VZ = 6V, VREF = 0V (see Figure 3 )
0.001
0.1
µA
VZ = VREF, IZ = 0.1mA to 15mA
Frequency = 0Hz (see Figure 1)
0.25
0.4
Ω
Deviation of Reference Input Current
over Temperature
R1 = 10kΩ, R2 = ∞,
II = 10mA, TA = Full Range (see Figure 2)
IZ(MIN)
Minimum Cathode Current for
Regulation
VZ = VREF (see Figure 1)
IZ(OFF)
Off-State Current
rZ
Dynamic Output Impedance (Note 5)
Min
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 25˚C. 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 = 150˚C, TJ = TA+ (θJA 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:
7
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LMV431/LMV431A/LMV431B
LMV431BI Electrical Characteristics
LMV431/LMV431A/LMV431B
LMV431BI Electrical Characteristics
(Continued)
10095807
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 = 125˚C.
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:
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Reference Voltage vs. Junction Temperature
Reference Input Current vs. Junction Temperature
10095862
10095850
Cathode Current vs. Cathode Voltage 1
Cathode Current vs. Cathode Voltage 2
10095852
10095851
Off-State Cathode Current vs.
Junction Temperature
Delta Reference Voltage Per
Delta Cathode Voltage vs. Junction Temperature
10095863
10095861
9
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LMV431/LMV431A/LMV431B
Typical Performance Characteristics
LMV431/LMV431A/LMV431B
Typical Performance Characteristics
(Continued)
Input Voltage Noise vs. Frequency
10095853
10095845
Test Circuit for Input Voltage Noise vs. Frequency
Low Frequency Peak to Peak Noise
10095854
10095864
Test Circuit for Peak to Peak Noise (BW= 0.1Hz to 10Hz)
Small Signal Voltage Gain and Phase Shift vs.
Frequency
10095846
Test Circuit For Voltage Gain and Phase Shift vs.
Frequency
10095855
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LMV431/LMV431A/LMV431B
Typical Performance Characteristics
(Continued)
Reference Impedance vs. Frequency
10095847
Test Circuit for Reference Impedance vs. Frequency
10095856
Pulse Response 1
10095848
Test Circuit for Pulse Response 1
10095857
Pulse Response 2
10095849
Test Circuit for Pulse Response 2
10095858
11
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LMV431/LMV431A/LMV431B
Typical Performance Characteristics
(Continued)
LMV431 Stability Boundary Condition
10095868
10095869
10095870
Test circuit for VZ = VREF
Test Circuit for VZ = 2V, 3V
Percentage Change in VREF vs. Operating Life at 55˚C
10095866
Extrapolated from life-test data taken at 125˚C; the activation energy assumed is 0.7eV.
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Series Regulator
Output Control of a Three Terminal Fixed Regulator
10095817
10095816
Higher Current Shunt Regulator
Crow Bar
10095818
10095819
Over Voltage/Under VoltageProtection Circuit
Voltage Monitor
10095820
13
10095821
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LMV431/LMV431A/LMV431B
Typical Applications
LMV431/LMV431A/LMV431B
Typical Applications
(Continued)
Delay Timer
Current Limiter or Current Source
10095823
10095822
Constant Current Sink
10095824
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14
LMV431/LMV431A/LMV431B
Physical Dimensions
inches (millimeters) unless otherwise noted
SOT23-5 Molded Small Outline Transistor Package (M5)
NS Package Number MF05A
SOT23-3 Molded Small Outline Transistor Package (M3)
NS Package Number MF03A
15
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LMV431/LMV431A/LMV431B Low-Voltage (1.24V) Adjustable Precision Shunt Regulators
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
TO-92 Plastic Package
NS Package Number Z03A
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