TI1 LM4041AIM3X-1.2 Lm4041 precision micropower shunt voltage reference Datasheet

LM4041
LM4041 Precision Micropower Shunt Voltage Reference
Literature Number: SNOS641D
LM4041
Precision Micropower Shunt Voltage Reference
General Description
Key Specifications (LM4041-1.2)
Ideal for space critical applications, the LM4041 precision
voltage reference is available in the sub-miniature SC70 and
SOT-23 surface-mount packages. The LM4041’s advanced
design eliminates the need for an external stabilizing capacitor while ensuring stability with any capacitive load, thus
making the LM4041 easy to use. Further reducing design
effort is the availability of a fixed (1.225V) and adjustable
reverse breakdown voltage. The minimum operating current
is 60 µA for the LM4041-1.2 and the LM4041-ADJ. Both
versions have a maximum operating current of 12 mA.
The LM4041 utilizes fuse and zener-zap reverse breakdown
or reference voltage trim during wafer sort to ensure that the
prime parts have an accuracy of better than ± 0.1%
(A grade) at 25˚C. Bandgap reference temperature drift curvature correction and low dynamic impedance ensure stable
reverse breakdown voltage accuracy over a wide range of
operating temperatures and currents.
Features
n
n
n
n
Small packages: SOT-23, TO-92, and SC70
No output capacitor required
Tolerates capacitive loads
Reverse breakdown voltage options of 1.225V and
adjustable
j Output voltage tolerance
± 0.1%(max)
(A grade, 25˚C)
j Low output noise
(10 Hz to 10kHz)
20µVrms
j Wide operating current range
60µA to 12mA
j Industrial temperature range
−40˚C to +85˚C
j Extended temperature range
−40˚C to +125˚C
j Low temperature coefficient
100 ppm/˚C (max)
Applications
n
n
n
n
n
n
n
Portable, Battery-Powered Equipment
Data Acquisition Systems
Instrumentation
Process Control
Energy Management
Automotive
Precision Audio Components
Connection Diagrams
SOT-23
01139201
01139240
*This pin must be left floating or connected to pin 2.
Top View
See NS Package Number MF03A
(JEDEC Registration TO-236AB)
SC-70
01139246
*This pin must be left floating or connected to pin 1.
01139247
Top View
See NS Package Number MAA05A
© 2005 National Semiconductor Corporation
DS011392
www.national.com
LM4041 Precision Micropower Shunt Voltage Reference
March 2005
LM4041
Connection Diagrams
(Continued)
TO-92
01139203
01139232
Bottom View
See NS Package Number Z03A
Ordering Information
Reverse
Breakdown
Voltage
Tolerance at 25˚C
and Average
Reverse
Breakdown
Voltage
Temperature
Coefficient
Package
M3 (SOT-23)
Supplied as 1000
Units Tape and
Reel
Supplied as 3000
Units Tape and
Reel
M7 (SC70)
Supplied as 1000
Units Tape and
Reel
Z (TO-92)
NS
Package
Number
Supplied as 3000
Units Tape and
Reel
± 0.1%, 100
ppm/˚C max (A
grade)
LM4041AIM3-1.2
LM4041AIM3X-1.2
± 0.2%, 100
ppm/˚C max (B
grade)
LM4041BIM3-1.2
LM4041BIM3X-1.2
± 0.5%, 100
ppm/˚C max (C
grade)
LM4041CEM3-1.2
LM4041CIM3-1.2
LM4041CEM3-ADJ
LM4041CIM3-ADJ
LM4041CEM3X-1.2 LM4041CIM7-1.2 LM4041CIM7X-1.2 LM4041CIZ-1.2 MF03A,
LM4041CIM3X-1.2 LM4041CIM7-ADJ LM4041CIM7X-ADJ LM4041CIZ-ADJ Z03A,
LM4041CEM3X-ADJ
MAA05A
LM4041CIM3X-ADJ
± 1.0%, 150
ppm/˚C max (D
grade)
LM4041DEM3-1.2
LM4041DIM3-1.2
LM4041DEM3-ADJ
LM4041DIM3-ADJ
LM4041DEM3X-1.2 LM4041DIM7-1.2 LM4041DIM7X-1.2 LM4041DIZ-1.2 MF03A,
LM4041DIM3X-1.2 LM4041DIM7-ADJ LM4041DIM7X-ADJ LM4041DIZ-ADJ Z03A,
LM4041DEM3X-ADJ
MAA05A
LM4041DIM3X-ADJ
± 2.0%, 150
ppm/˚C max (E
grade)
LM4041EEM3-1.2
LM4041EIM3-1.2
LM4041EEM3X-1.2 LM4041EIM7-1.2
LM4041EIM3X-1.2
www.national.com
LM4041BIM7-1.2
2
LM4041BIM7X-1.2
LM4041EIM7X-1.2
LM4041AIZ-1.2
MF03A,
Z03A
LM4041BIZ-1.2
MF03A,
Z03A,
MAA05A
LM4041EIZ-1.2
MF03A,
Z03A,
MAA05A
Part Marking
R1A (SOT-23 Only)
R1B
R1C
Field Definition
First Field:
R = Reference
Second Field:
R1D
1 = 1.225V Voltage Option
R1E
A = Adjustable
Third Field:
RAC
RAD
A–E = Initial Reverse Breakdown
Voltage or Reference Voltage Tolerance
A = ± 0.1%, B = ± 0.2%, C = ± 0.5%, D = ± 1.0%, E = ± 2.0%
3
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LM4041
SOT-23 and SC70 Package Marking Information
Only three fields of marking are possible on the SOT-23’s and SC70’s small surface. This table gives the meaning of the three
fields.
LM4041
Absolute Maximum Ratings (Note 1)
Soldering (10 seconds)
ESD Susceptibility
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Reverse Current
20 mA
Forward Current
10 mA
Human Body Model (Note 3)
2 kV
Machine Model (Note 3)
200V
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
Maximum Output Voltage
(LM4041-ADJ)
+260˚C
15V
Operating Ratings(Notes 1, 2)
Power Dissipation (TA = 25˚C) (Note 2)
M3 Package
306 mW
Z Package
550 mW
M7 Package
241mW
Storage Temperature
−65˚C to +150˚C
M3 Packages
+215˚C
Infrared (15 seconds)
+220˚C
Industrial Temperature Range
−40˚C ≤ TA ≤ +85˚C
Extended Temperature Range
−40˚C ≤ TA ≤ +125˚C
Reverse Current
Lead Temperature
Vapor phase (60 seconds)
(Tmin ≤ TA ≤ Tmax)
Temperature Range
LM4041-1.2
60 µA to 12 mA
LM4041-ADJ
60 µA to 12 mA
Output Voltage Range
LM4041-ADJ
Z Package
1.24V to 10V
LM4041-1.2
Electrical Characteristics (Industrial Temperature Range)
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. The grades A and B designate initial Reverse Breakdown Voltage tolerances of ± 0.1% and ± 0.2%, respectively.
Symbol
VR
Parameter
Conditions
Reverse Breakdown Voltage
IR = 100 µA
Reverse Breakdown Voltage
IR = 100 µA
Typical
(Note 4)
1.225
Tolerance (Note 6)
IRMIN
∆VR/∆T
Minimum Operating Current
Average Reverse Breakdown
Voltage Temperature
Coefficient (Note 6)
∆VR/∆IR Reverse Breakdown Voltage
Change with Operating
Current Change
(Note 9)
ZR
Reverse Dynamic Impedance
IR = 100 µA
± 20
± 15
± 15
IRMIN ≤ IR ≤ 1 mA
0.7
IR= 10 mA
IR = 1 mA
1 mA ≤ IR ≤ 12 mA
Wideband Noise
± 1.2
± 9.2
± 2.4
± 10.4
mV (max)
60
60
µA (max)
65
65
µA (max)
± 100
± 100
ppm/˚C (max)
IR = 100 µA
mV (max)
µA
ppm/˚C
ppm/˚C
mV
1.5
1.5
mV (max)
2.0
2.0
mV (max)
6.0
6.0
mV (max)
8.0
8.0
mV (max)
1.5
1.5
Ω (max)
4.0
IR = 1 mA, f = 120 Hz,
Units
(Limit)
V
45
mV
Ω
0.5
IAC= 0.1 IR
eN
LM4041AIM3 LM4041BIM3
LM4041AIZ
LM4041BIZ
Limits
LM4041BIM7
(Note 5)
Limits
(Note 5)
20
µVrms
120
ppm
0.08
%
10 Hz ≤ f ≤ 10 kHz
∆VR
Reverse Breakdown Voltage
Long Term Stability
t = 1000 hrs
T = 25˚C ± 0.1˚C
IR = 100 µA
VHYST
Thermal Hysteresis
(Note 10)
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∆T = −40˚C to +125˚C
4
LM4041
LM4041-1.2
Electrical Characteristics (Industrial Temperature Range)
(Continued)
LM4041-1.2
Electrical Characteristics (Industrial Temperature Range)
Boldface limits apply for TA = TJ = TMINto TMAX; all other limits TA = TJ = 25˚C. The grades C, D and E designate initial Reverse Breakdown Voltage tolerances of ± 0.5%, ± 1.0% and ± 2.0%, respectively.
Symbol
VR
Parameter
Conditions
Reverse Breakdown
Voltage
IR = 100 µA
Reverse Breakdown
Voltage
IR = 100 µA
Typical
(Note 4)
1.225
Tolerance (Note 6)
IRMIN
Minimum Operating
Current
∆VR/∆T VR Temperature
Coefficient (Note 6)
∆VR/∆IR Reverse Breakdown
Voltage Change with
Operating Current
Change
(Note 9)
IR= 100 µA
± 20
± 15
± 15
IRMIN ≤ IR ≤ 1 mA
0.7
IR = 10 mA
IR = 1 mA
Reverse Dynamic
Impedance
IR = 1 mA, f = 120 Hz
±6
± 12
± 25
mV (max)
± 14
± 24
± 36
mV (max)
Wideband Noise
IR = 100 µA
µA
60
65
65
µA (max)
65
70
70
µA (max)
± 100
± 150
± 150
ppm/˚C (max)
ppm/˚C
ppm/˚C
mV
1.5
2.0
2.0
mV (max)
2.0
2.5
2.5
mV (max)
6.0
8.0
8.0
mV (max)
8.0
10.0
10.0
mV (max)
2.5
mV
Ω
0.5
IAC = 0.1 IR
eN
Units
(Limit)
V
45
1 mA ≤ IR ≤ 12 mA
ZR
LM4041CIM3 LM4041DIM3 LM4041EIM3
LM4041CIZ
LM4041DIZ
LM4041EIZ
LM4041CIM7 LM4041DIM7 LM4041EIM7
Limits
Limits (Note
Limits
(Note 5)
5)
(Note 5)
1.5
2.0
2.0
Ω(max)
20
µVrms
120
ppm
0.08
%
5
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10 Hz ≤ f ≤ 10 kHz
∆VR
VHYST
Reverse Breakdown
Voltage Long Term
Stability
Thermal Hysteresis
(Note 10)
t = 1000 hrs
T = 25˚C ± 0.1˚C
IR = 100 µA
∆T = −40˚C to +125˚C
LM4041
LM4041-1.2
Electrical Characteristics (Extended Temperature Range)
Boldface limits apply for TA = TJ = TMINto TMAX; all other limits TA = TJ = 25˚C. The grades C, D and E designate initial Reverse Breakdown Voltage tolerance of ± 0.5%, ± 1.0% and ± 2.0% respectively.
Symbol
VR
Parameter
Conditions
Reverse Breakdown
Voltage
IR = 100 µA
Reverse Breakdown
Voltage Error
IR = 100 µA
Typical LM4041CEM3 LM4041DEM3 LM4041EEM3
(Note 4)
Limits
Limits
Limits
(Note 5)
(Note 5)
(Note 5)
1.225
(Note 6)
IRMIN
Minimum Operating
Current
∆VR/∆T VR Temperature
Coefficient(Note 6)
∆VR/∆IR Reverse Breakdown
Change with
Current
(Note 9)
ZR
Reverse Dynamic
Impedance
eN
Noise Voltage
V
±6
± 12
± 25
mV (max)
± 18.4
± 31
± 43
mV (max)
60
65
65
µA (max)
68
73
73
µA (max)
± 100
± 150
± 150
ppm/˚C
(max)
45
IR = 1 mA
± 20
± 15
IR = 100 µA
± 15
IRMIN ≤ IR ≤ 1.0 mA
0.7
IR= 10 mA
1 mA ≤ IR ≤ 12 mA
IR = 1 mA, f = 120 Hz,
IR = 100 µA
µA
ppm/˚C
ppm/˚C
mV
1.5
2.0
2.0
mV (max)
2.0
2.5
2.5
mV (max)
6.0
8.0
8.0
mV (max)
8.0
10.0
10.0
mV (max)
2.5
mV
Ω
0.5
IAC= 0.1 IR
Units
(Limit)
1.5
2.0
2.0
Ω (max)
20
µVrms
120
ppm
0.08
%
10 Hz ≤ f ≤ 10 kHz
∆VR
Long Term Stability
(Non-Cumulative)
t = 1000 hrs
T = 25˚C ± 0.1˚C
IR = 100 µA
VHYST
Thermal Hysteresis
(Note 10)
www.national.com
∆T = −40˚C to +125˚C
6
LM4041
LM4041-ADJ (Adjustable)
Electrical Characteristics (Industrial Temperature Range)
Boldface limits apply for TA = TJ = TMINto TMAX; all other limits TJ = 25˚C unless otherwise specified (SOT-23, see (Note
7)), IRMIN ≤ IR ≤ 12 mA, VREF ≤ VOUT ≤ 10V. The grades C and D designate initial Reference Voltage Tolerances of ± 0.5%
and ± 1%, respectively for VOUT = 5V.
Symbol
VREF
Parameter
Conditions
Typical
(Note 4)
Reference Voltage
IR = 100 µA, VOUT = 5V
Reference Voltage
IR = 100 µA, VOUT = 5V
∆VREF/∆IR
Minimum Operating
Current
Reference Voltage
Change with Operating
Current Change
(Note 9)
IFB
∆VREF/∆T
ZOUT
eN
IRMIN ≤ IR ≤ 1 mA
± 6.2
± 14
± 12
± 24
mV (max)
60
65
µA (max)
65
70
µA (max)
1.5
2.0
mV (max)
2.0
2.5
mV (max)
V
(Note 7)
1 mA ≤ IR ≤ 12 mA
mV
2
IR = 1 mA
mV
4
6
mV (max)
6
8
mV (max)
−1.55
mV/V
−2.0
−2.5
mV/V (max)
−2.5
−3.0
mV/V (max)
100
150
nA (max)
120
200
nA (max)
60
Average Reference
Voltage Temperature
Coefficient (Note 8)
VOUT = 5V,
IR = 10 mA
Dynamic Output
Impedance
IR = 1 mA, f = 120 Hz,
IR =
nA
20
1 mA
15
IR = 100 µA
15
mV (max)
µA
0.7
SOT-23: VOUT ≥ 1.6V
Feedback Current
Wideband Noise
Units
(Limit)
45
SOT-23: VOUT ≥ 1.6V (Note 7)
∆VREF/∆VO Reference Voltage
Change
with Output Voltage
Change
LM4041DIM3
LM4041DIZ
LM4041DIM7
(Note 5)
1.233
Tolerance (Note 8)
IRMIN
LM4041CIM3
LM4041CIZ
LM4041CIM7
(Note 5)
ppm/˚C
± 100
± 150
ppm/˚C (max)
ppm/˚C
IAC = 0.1 IR
IR = 100 µA
VOUT = VREF
0.3
Ω
VOUT = 10V
2
Ω
VOUT = VREF
20
µVrms
120
ppm
10 Hz ≤ f ≤ 10 kHz
∆VREF
VHYST
Reference Voltage Long
t = 1000 hrs,
Term Stability
T = 25˚C ± 0.1˚C
IR = 100 µA
Thermal Hysteresis
(Note 10)
∆T = −40˚C to +125˚C
0.08
7
%
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LM4041
LM4041-ADJ (Adjustable)
Electrical Characteristics (Extended Temperature Range)
Boldface limits apply for TA = TJ = TMINto TMAX; all other limits TJ = 25˚C unless otherwise specified (SOT-23, see (Note
7)), IRMIN ≤ IR ≤ 12 mA, VREF ≤ VOUT ≤ 10V. The grades C and D designate initial Reference Voltage Tolerances of ± 0.5%
and ± 1%, respectively for VOUT = 5V.
Symbol
VREF
Parameter
Conditions
Typical
(Note 4)
Reference Voltage
IR = 100 µA, VOUT = 5V
Reference Voltage
IR = 100 µA, VOUT = 5V
1.233
Tolerance (Note 8)
IRMIN
∆VREF/∆IR
Minimum Operating
Current
Reference Voltage
Change with Operating
Current Change
(Note 9)
IRMIN ≤ IR ≤ 1 mA
IFB
∆VREF/∆T
ZOUT
eN
(Note 7)
1 mA ≤ IR ≤ 12 mA
mV (max)
60
65
µA (max)
68
73
µA (max)
1.5
2.0
mV (max)
2.0
2.5
mV (max)
IR = 1 mA
mV
mV
8
10
mV (max)
6
8
mV (max)
−1.55
mV/V
−2.0
−2.5
mV/V (max)
−3.0
−4.0
mV/V (max)
100
150
nA (max)
120
200
nA (max)
60
Average Reference
Voltage Temperature
Coefficient (Note 8)
VOUT = 5V,
Dynamic Output
Impedance
IR = 1 mA, f = 120 Hz,
mV (max)
µA
2
Feedback Current
Wideband Noise
V
± 12
± 30
0.7
SOT-23: VOUT ≥ 1.6V
Units
(Limit)
± 6.2
± 18
45
SOT-23: VOUT ≥ 1.6V(Note 7)
∆VREF/∆VO Reference Voltage
Change
with Output Voltage
Change
LM4041CEM3 LM4041DEM3
(Note 5)
(Note 5)
nA
IR = 10 mA
20
ppm/˚C
IR =
1 mA
15
IR = 100 µA
15
ppm/˚C
± 100
± 150
ppm/˚C (max)
IAC = 0.1 IR
IR = 100 µA
VOUT = VREF
0.3
Ω
VOUT = 10V
2
Ω
VOUT = VREF
20
µVrms
120
ppm
10 Hz ≤ f ≤ 10 kHz
∆VREF
VHYST
Reference Voltage Long
t = 1000 hrs,
Term Stability
T = 25˚C ± 0.1˚C
Thermal Hysteresis
(Note 10)
∆T = −40˚C to +125˚C
www.national.com
IR = 100 µA
0.08
8
%
LM4041
LM4041-ADJ (Adjustable)
Electrical Characteristics (Extended Temperature Range)
(Continued)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to
ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax − TA)/θJA or the
number given in the Absolute Maximum Ratings, whichever is lower. For the LM4041, TJmax = 125˚C, and the typical thermal resistance (θJA), when board mounted,
is 326˚C/W for the SOT-23 package, 415˚C/W for the SC70 package and 180˚C/W with 0.4" lead length and 170˚C/W with 0.125" lead length for the TO-92 package.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin. All pins are rated at 2kV for Human Body Model, but the feedback pin which is rated at 1kV.
Note 4: Typicals are at TJ = 25˚C and represent most likely parametric norm.
Note 5: Limits are 100% production tested at 25˚C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQC) methods.
The limits are used to calculate National’s AOQL.
Note 6: The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance
± [(∆VRv∆T)(max ∆T)(VR)]. Where, ∆VR/∆T is the VR temperature coefficient, max∆T is the maximum difference in temperature from the reference point of 25 ˚C
to T MAX or TMIN, and VR is the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature range where
max∆T=65˚C is shown below:
A-grade:
B-grade:
C-grade:
D-grade:
E-grade:
± 0.75% = ± 0.1% ± 100 ppm/˚C x 65˚C
± 0.85% = ± 0.2% ± 100 ppm/˚C x 65˚C
± 1.15% = ± 0.5% ± 100 ppm/˚C x 65˚C
± 1.98% = ± 1.0% ± 150 ppm/˚C x 65˚C
± 2.98% = ± 2.0% ± 150 ppm/˚C x 65˚C
The total over-temperature tolerance for the different grades in the extended temperature range where max ∆T = 100 ˚C is shown below:
B-grade:
C-grade:
D-grade:
E-grade:
± 1.2% = ± 0.2% ± 100 ppm/˚C x 100˚C
± 1.5% = ± 0.5% ± 100 ppm/˚C x 100˚C
± 2.5% = ± 1.0% ± 150 ppm/˚C x 100˚C
± 4.5% = ± 2.0% ± 150 ppm/˚C x 100˚C
Therefore, as an example, the A-grade LM4041-1.2 has an over-temperature Reverse Breakdown Voltage tolerance of ± 1.2V x 0.75% = ± 9.2 mV.
Note 7: When VOUT ≤ 1.6V, the LM4041-ADJ in the SOT-23 package must operate at reduced IR. This is caused by the series resistance of the die attach between
the die (-) output and the package (-) output pin. See the Output Saturation (SOT-23 only) curve in the Typical Performance Characteristics section.
Note 8: Reference voltage and temperature coefficient will change with output voltage. See Typical Performance Characteristics curves.
Note 9: Load regulation is measured on pulse basis from no load to the specified load current. Ouput changes due to die temperature change must be taken into
account separately.Note 10: Thermal hysteresis is defined as the difference in voltage measured at +25˚C after cycling to temperature -40˚C and the 25˚C measurement after cycling
to temperature +125˚C.
9
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LM4041
Typical Performance Characteristics
Temperature Drift for Different
Average Temperature Coefficient
Output Impedance vs Frequency
01139219
01139204
Noise Voltage
Reverse Characteristics and
Minimum Operating Current
01139205
01139209
Start-Up
Characteristics
01139208
01139207
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10
LM4041
Typical Performance Characteristics
(Continued)
Reference Voltage vs Output
Voltage and Temperature
Reference Voltage vs Temperature
and Output Voltage
01139211
01139210
Feedback Current vs Output
Voltage and Temperature
Output Saturation
(SOT-23 Only)
01139233
01139212
Output Impedance vs Frequency
Output Impedance vs Frequency
01139213
01139214
11
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LM4041
Typical Performance Characteristics
(Continued)
Reverse Characteristics
01139216
01139215
Large Signal Response
01139218
01139217
Functional Block Diagram
01139221
*LM4041-ADJ only
**LM4041-1.2 only
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12
The LM4041 is a precision micro-power curvature-corrected
bandgap shunt voltage reference. For space critical applications, the LM4041 is available in the sub-miniature SOT-23
and SC70 surface-mount package. The LM4041 has been
designed for stable operation without the need of an external
capacitor connected between the “+” pin and the “−” pin. If,
however, a bypass capacitor is used, the LM4041 remains
stable. Design effort is further reduced with the choice of
either a fixed 1.2V or an adjustable reverse breakdown
voltage. The minimum operating current is 60 µA for the
LM4041-1.2 and the LM4041-ADJ. Both versions have a
maximum operating current of 12 mA.
VO = VREF[(R2/R1) + 1]
(1)
where VO is the output voltage. The actual value of the
internal VREF is a function of VO. The “corrected” VREF is
determined by
(2)
VREF = ∆VO (∆VREF/∆VO) + VY
where
VY = 1.240 V
and
∆VO = (VO − VY)
∆VREF/∆VO is found in the Electrical Characteristics and is
typically −1.55 mV/V. You can get a more accurate indication
of the output voltage by replacing the value of VREF in
equation (1) with the value found using equation (2).
LM4041s using the SOT-23 package have pin 3 connected
as the (-) output through the package’s die attach interface.
Therefore, the LM4041-1.2’s pin 3 must be left floating or
connected to pin 2 and the LM4041-ADJ’s pin 3 is the (-)
output.
Note that the actual output voltage can deviate from that
predicted using the typical value of ∆VREF/∆VO in equation
(2): for C-grade parts, the worst-case ∆VREF/∆VO is −2.5
mV/V. For D-grade parts, the worst-case ∆VREF/∆VO is −3.0
mV/V.
LM4041s using the SC70 package have pin 2 connected as
the (−) output through the packages’ die attach interface.
Therefore, the LM4041-1.2’s pin 2 must be left floating or
connected to pin 1, and the LM4041-ADJ’s pin 2 is the (−)
output.
Typical Applications
The typical thermal hysteresis specification is defined as the
change in +25˚C voltage measured after thermal cycling.
The device is thermal cycled to temperature -40˚C and then
measured at 25˚C. Next the device is thermal cycled to
temperature +125˚C and again measured at 25˚C. The resulting VOUT delta shift between the 25˚C measurements is
thermal hysteresis. Thermal hysteresis is common in precision references and is induced by thermal-mechanical package stress. Changes in environmental storage temperature,
operating temperature and board mounting temperature are
all factors that can contribute to thermal hysteresis.
In a conventional shunt regulator application (Figure 1), an
external series resistor (RS) is connected between the supply voltage and the LM4041. RS determines the current that
flows through the load (IL) and the LM4041 (IQ). Since load
current and supply voltage may vary, RS should be small
enough to supply at least the minimum acceptable IQ to the
LM4041 even when the supply voltage is at its minimum and
the load current is at its maximum value. When the supply
voltage is at its maximum and IL is at its minimum, RS should
be large enough so that the current flowing through the
LM4041 is less than 12 mA.
RS should be selected based on the supply voltage, (VS), the
desired load and operating current, (IL and IQ), and the
LM4041’s reverse breakdown voltage, VR.
01139222
FIGURE 1. Shunt Regulator
01139234
VO = VREF[(R2/R1) + 1]
The LM4041-ADJ’s output voltage can be adjusted to any
value in the range of 1.24V through 10V. It is a function of the
internal reference voltage (VREF) and the ratio of the external
FIGURE 2. Adjustable Shunt Regulator
13
www.national.com
LM4041
feedback resistors as shown in Figure 2 . The output voltage
is found using the equation
Applications Information
LM4041
Typical Applications
(Continued)
01139224
FIGURE 3. Bounded amplifier reduces saturation-induced delays and can prevent succeeding stage damage.
Nominal clamping voltage is ± VO (LM4041’s reverse breakdown voltage) +2 diode VF.
01139223
01139220
FIGURE 5. Voltage Level Detector
FIGURE 4. Voltage Level Detector
www.national.com
14
LM4041
Typical Applications
(Continued)
01139236
FIGURE 9. Bidirectional Adjustable
Clamp ± 2.4V to ± 6V
01139225
FIGURE 6. Fast Positive Clamp
2.4V + VD1
01139226
FIGURE 7. Bidirectional Clamp ± 2.4V
01139235
FIGURE 8. Bidirectional Adjustable
Clamp ± 18V to ± 2.4V
15
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LM4041
Typical Applications
(Continued)
01139237
FIGURE 10. Simple Floating Current Detector
01139238
FIGURE 11. Current Source
Note 11: *D1 can be any LED, VF = 1.5V to 2.2V at 3 mA. D1 may act as an
indicator. D1 will be on if ITHRESHOLDfalls below the threshold current, except
with I = 0.
www.national.com
16
LM4041
Typical Applications
(Continued)
01139239
FIGURE 12. Precision Floating Current Detector
01139229
01139228
FIGURE 13. Precision 1 µA to 1 mA Current Sources
17
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LM4041
Physical Dimensions
inches (millimeters)
unless otherwise noted
Plastic Surface Mount Package (M3)
NS Package Number MF03A
(JEDEC Registration TO-236AB)
Molded Package (SC70)
NS Package Number MAA05A
www.national.com
18
LM4041 Precision Micropower Shunt Voltage Reference
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Plastic Package (Z)
NS Package Number Z03A
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For the most current product information visit us at www.national.com.
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