LM4041EEM3X-1.2 [NSC]
Precision Micropower Shunt Voltage Reference; 精密微功耗并联型电压基准
| 型号： | LM4041EEM3X-1.2 |
| 厂家： | 
National Semiconductor |
| 描述： | Precision Micropower Shunt Voltage Reference |
| 文件： | 总19页 (文件大小：346K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
January 2001
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 capaci-
tor 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.
j
Output voltage tolerance
(A grade, 25˚C)
±
0.1%(max)
j
Low output noise
(10 Hz to 10kHz)
20µVrms
j
j
j
j
Wide operating current range
Industrial temperature range
Extended temperature range
Low temperature coefficient
60µA to 12mA
−40˚C to +85˚C
−40˚C to +125˚C
100 ppm/˚C (max)
The LM4041 utilizes fuse and zener-zap reverse breakdown
or reference voltage trim during wafer sort to ensure that the
Applications
±
prime parts have an accuracy of better than 0.1%
n Portable, Battery-Powered Equipment
n Data Acquisition Systems
n Instrumentation
(A grade) at 25˚C. Bandgap reference temperature drift cur-
vature correction and low dynamic impedance ensure stable
reverse breakdown voltage accuracy over a wide range of
operating temperatures and currents.
n Process Control
n Energy Management
n Automotive
n Precision Audio Components
Features
n Small packages: SOT-23, TO-92, and SC70
n No output capacitor required
n Tolerates capacitive loads
n Reverse breakdown voltage options of 1.225V and
adjustable
Connection Diagrams
SOT-23
SC-70
DS011392-1
DS011392-46
*This pin must be left floating or connected to pin 2.
*This pin must be left floating or connected to pin 1.
DS011392-40
Top View
See NS Package Number MF03A
(JEDEC Registration TO-236AB)
DS011392-47
Top View
See NS Package Number MAA05A
© 2001 National Semiconductor Corporation
DS011392
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Connection Diagrams (Continued)
TO-92
DS011392-32
DS011392-3
Bottom View
See NS Package Number Z03A
Ordering Information
Reverse
Breakdown
Package
Voltage Tolerance
M3 (SOT-23)
M7 (SC70)
Z (TO-92)
at 25˚C and
Average Reverse
Breakdown
Voltage
NS
Package
Number
Supplied as 1000 Supplied as 3000
Supplied as
1000 Units Tape
and Reel
Supplied as 3000
Units Tape and
Reel
Units Tape and
Reel
Units Tape and
Reel
Temperature
Coefficient
±
0.1%, 100 ppm/˚C LM4041AIM3-1.2
LM4041AIM3X-1.2
LM4041AIZ-1.2 MF03A,
Z03A
max (A grade)
±
0.2%, 100 ppm/˚C LM4041BIM3-1.2
LM4041BIM3X-1.2 LM4041BIM7-1.2 LM4041BIM7X-1.2 LM4041BIZ-1.2 MF03A,
max (B grade)
Z03A,
MAA05A
±
0.5%, 100 ppm/˚C LM4041CEM3-1.2 LM4041CEM3X-1.2 LM4041CIM7-1.2 LM4041CIM7X-1.2 LM4041CIZ-1.2 MF03A,
max (C grade)
LM4041CIM3-1.2
LM4041CIM3X-1.2 LM4041CIM7-ADJ LM4041CIM7X-ADJ LM4041CIZ-ADJ Z03A,
LM4041CEM3-ADJ LM4041CEM3X-ADJ
LM4041CIM3-ADJ LM4041CIM3X-ADJ
MAA05A
±
1.0%, 150 ppm/˚C LM4041DEM3-1.2 LM4041DEM3X-1.2 LM4041DIM7-1.2 LM4041DIM7X-1.2 LM4041DIZ-1.2 MF03A,
max (D grade) LM4041DIM3-1.2 LM4041DIM3X-1.2 LM4041DIM7-ADJ LM4041DIM7X-ADJ LM4041DIZ-ADJ Z03A,
LM4041DEM3-ADJ LM4041DEM3X-ADJ
LM4041DIM3-ADJ LM4041DIM3X-ADJ
MAA05A
±
2.0%, 150 ppm/˚C LM4041EEM3-1.2 LM4041EEM3X-1.2 LM4041EIM7-1.2 LM4041EIM7X-1.2 LM4041EIZ-1.2 MF03A,
max (E grade)
LM4041EIM3-1.2
LM4041EIM3X-1.2
Z03A,
MAA05A
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.
Part Marking
Field Definition
R1A (SOT-23 Only)
First Field:
R1B
R1C
R1D
R1E
R = Reference
Second Field:
1 = 1.225V Voltage Option
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%
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2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Soldering (10 seconds)
ESD Susceptibility
+260˚C
Human Body Model (Note 3)
Machine Model (Note 3)
2 kV
200V
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
Reverse Current
20 mA
10 mA
Forward Current
Maximum Output Voltage
(LM4041-ADJ)
15V
Operating Ratings(Notes 1, 2)
Power Dissipation (TA = 25˚C) (Note 2)
M3 Package
Temperature Range
Industrial Temperature Range
Extended Temperature Range
Reverse Current
(Tmin ≤ TA ≤ Tmax)
306 mW
550 mW
−40˚C ≤ TA ≤ +85˚C
−40˚C ≤ TA ≤ +125˚C
Z Package
M7 Package
241mW
Storage Temperature
Lead Temperature
M3 Packages
−65˚C to +150˚C
LM4041-1.2
60 µA to 12 mA
60 µA to 12 mA
LM4041-ADJ
Output Voltage Range
LM4041-ADJ
Vapor phase (60 seconds)
Infrared (15 seconds)
Z Package
+215˚C
+220˚C
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 Re-
±
±
verse Breakdown Voltage tolerances of 0.1% and 0.2%, respectively.
Symbol
Parameter
Conditions
Typical LM4041AIM3 LM4041BIM3
Units
(Note 4)
1.225
45
LM4041AIZ
Limits
LM4041BIZ
LM4041BIM7
Limits
(Limit)
(Note 5)
(Note 5)
VR
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 100 µA
IR = 100 µA
V
mV (max)
mV (max)
µA
±
±
2.4
1.2
±
±
10.4
9.2
IRMIN
Minimum Operating Current
60
60
µA (max)
µA (max)
ppm/˚C
ppm/˚C (max)
ppm/˚C
mV
65
65
±
±
±
∆VR/∆T Average Reverse Breakdown IR= 10 mA
20
15
15
Voltage Temperature
±
±
100
IR = 1 mA
100
Coefficient (Note 6)
IR = 100 µA
∆VR/∆IR Reverse Breakdown Voltage
Change with Operating
IRMIN ≤ IR ≤ 1 mA
0.7
1.5
1.5
mV (max)
mV (max)
mV
Current Change
2.0
2.0
1 mA ≤ IR ≤ 12 mA
4.0
6.0
6.0
mV (max)
mV (max)
Ω
8.0
8.0
ZR
eN
Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz,
AC= 0.1 IR
0.5
20
I
1.5
1.5
Ω (max)
µVrms
Wideband Noise
IR = 100 µA
10 Hz ≤ f ≤ 10 kHz
t = 1000 hrs
∆VR
Reverse Breakdown Voltage
Long Term Stability
±
T = 25˚C 0.1˚C
120
ppm
IR = 100 µA
3
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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 Re-
±
±
±
verse Breakdown Voltage tolerances of 0.5%, 1.0% and 2.0%, respectively.
Symbol
Parameter
Conditions
Typical LM4041CIM3 LM4041DIM3 LM4041EIM3
(Note 4) LM4041CIZ LM4041DIZ LM4041EIZ
Units
(Limit)
LM4041CIM7 LM4041DIM7 LM4041EIM7
Limits
Limits(Note
Limits
(Note 5)
(Note 5)
5)
VR
Reverse Breakdown
Voltage
IR = 100 µA
1.225
V
±
±
±
Reverse Breakdown
Voltage
IR = 100 µA
6
12
25
mV (max)
±
±
±
Tolerance (Note 6)
14
24
36
mV (max)
µA
IRMIN
Minimum Operating
Current
45
60
65
65
µA (max)
µA (max)
ppm/˚C
65
70
70
±
±
±
∆VR/∆T VR Temperature
IR = 10 mA
20
15
15
Coefficient (Note 6)
±
±
±
150
IR = 1 mA
100
150
ppm/˚C (max)
ppm/˚C
IR= 100 µA
∆VR/∆IR Reverse Breakdown
Voltage Change with
Operating Current
Change
IRMIN ≤ IR ≤ 1 mA
0.7
mV
1.5
2.0
2.0
mV (max)
mV (max)
2.0
2.5
2.5
1 mA ≤ IR ≤ 12 mA
2.5
mV
mV (max)
mV (max)
Ω
6.0
8.0
8.0
8.0
10.0
10.0
ZR
Reverse Dynamic
Impedance
IR = 1 mA,
f = 120 Hz
0.5
20
IAC = 0.1 IR
1.5
2.0
2.0
Ω(max)
eN
Wideband Noise
IR = 100 µA
µVrms
10 Hz ≤ f ≤ 10 kHz
t = 1000 hrs
∆VR
Reverse Breakdown
Voltage Long Term
Stability
±
T = 25˚C 0.1˚C
120
ppm
IR = 100 µA
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4
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 Re-
±
±
±
verse Breakdown Voltage tolerance of 0.5%, 1.0% and 2.0% respectively.
Symbol
Parameter
Conditions
Typical LM4041CEM3 LM4041DEM3 LM4041EEM3
Units
(Note 4)
1.225
Limits
Limits
Limits
(Limit)
(Note 5)
(Note 5)
(Note 5)
VR
Reverse Breakdown
Voltage
IR = 100 µA
V
±
±
±
Reverse Breakdown
Voltage Error
IR = 100 µA
6
12
25
mV (max)
±
±
±
(Note 6)
18.4
31
43
mV (max)
µA
IRMIN
Minimum Operating
Current
45
60
65
65
µA (max)
µA (max)
ppm/˚C
68
73
73
±
±
∆VR/∆T VR Temperature
IR= 10 mA
IR = 1 mA
20
15
Coefficient(Note 6)
±
±
±
150
100
150
ppm/˚C
(max)
±
IR = 100 µA
15
ppm/˚C
mV
∆VR/∆IR Reverse Breakdown
Change with
IRMIN ≤ IR ≤ 1.0 mA
0.7
2.5
1.5
2.0
2.0
mV (max)
mV (max)
mV
Current
2.0
2.5
2.5
1 mA ≤ IR ≤ 12 mA
6.0
8.0
8.0
mV (max)
mV (max)
Ω
8.0
10.0
10.0
ZR
Reverse Dynamic
Impedance
IR = 1 mA, f = 120
Hz,
0.5
20
I
AC= 0.1 IR
1.5
2.0
2.0
Ω (max)
eN
Noise Voltage
IR = 100 µA
µVrms
10 Hz ≤ f ≤ 10 kHz
t = 1000 hrs
∆VR
Long Term Stability
(Non-Cumulative)
±
T = 25˚C 0.1˚C
120
ppm
IR = 100 µA
5
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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
Parameter
Conditions
Typical LM4041CIM3 LM4041DIM3
Units
(Limit)
(Note
4)
LM4041CIZ
LM4041CIM7 LM4041DIM7
(Note 5) (Note 5)
LM4041DIZ
VREF
Reference Voltage
Reference Voltage
Tolerance (Note 8)
IR = 100 µA, VOUT = 5V
IR = 100 µA, VOUT = 5V
1.233
45
V
±
±
6.2
12
mV (max)
mV (max)
µA
±
±
14
24
IRMIN
Minimum Operating
Current
60
65
µA (max)
µA (max)
mV
65
70
∆VREF/∆IR Reference Voltage
Change with Operating
Current Change
IRMIN ≤ IR ≤ 1 mA
SOT-23: VOUT ≥ 1.6V
(Note 7)
0.7
2
1.5
2.0
mV (max)
mV (max)
mV
2.0
2.5
1 mA ≤ IR ≤ 12 mA
SOT-23: VOUT ≥ 1.6V (Note
4
6
mV (max)
7)
6
8
mV (max)
mV/V
∆VREF/∆VO Reference Voltage
Change
IR = 1 mA
−1.55
60
−2.0
−2.5
mV/V (max)
mV/V (max)
with Output Voltage
Change
−2.5
−3.0
IFB
Feedback Current
nA
100
150
nA (max)
nA (max)
ppm/˚C
120
200
∆VREF/∆T Average Reference
Voltage Temperature
VOUT = 5V,
IR
IR
=
=
10 mA
1 mA
20
15
15
±
±
150
100
ppm/˚C (max)
ppm/˚C
Coefficient (Note 8)
IR = 100 µA
ZOUT
Dynamic Output
Impedance
IR = 1 mA, f = 120 Hz,
IAC = 0.1 IR
VOUT = VREF
VOUT 10V
VOUT = VREF
10 Hz ≤ f ≤ 10 kHz
Reference Voltage Long t = 1000 hrs, IR = 100 µA
0.3
2
Ω
Ω
=
eN
Wideband Noise
IR = 100 µA
20
µVrms
∆VREF
120
ppm
±
T = 25˚C 0.1˚C
Term Stability
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6
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
Parameter
Conditions
Typical LM4041CEM3 LM4041DEM3
Units
(Limit)
(Note 4)
(Note 5)
(Note 5)
VREF
Reference Voltage
Reference Voltage
Tolerance (Note 8)
IR = 100 µA, VOUT = 5V
IR = 100 µA, VOUT = 5V
1.233
V
±
±
6.2
12
mV (max)
mV (max)
µA
±
±
18
30
IRMIN
Minimum Operating
Current
45
0.7
2
60
65
µA (max)
µA (max)
mV
68
73
∆VREF/∆IR Reference Voltage
Change with Operating
Current Change
IRMIN ≤ IR ≤ 1 mA
SOT-23: VOUT ≥ 1.6V
(Note 7)
1.5
2.0
mV (max)
mV (max)
mV
2.0
2.5
1 mA ≤ IR ≤ 12 mA
SOT-23: VOUT ≥ 1.6V(Note
8
10
mV (max)
7)
6
8
mV (max)
mV/V
∆VREF/∆VO Reference Voltage
Change
IR = 1 mA
−1.55
60
−2.0
−2.5
mV/V (max)
mV/V (max)
with Output Voltage
Change
−3.0
−4.0
IFB
Feedback Current
nA
100
150
nA (max)
nA (max)
ppm/˚C
120
200
∆VREF/∆T Average Reference
Voltage Temperature
VOUT = 5V,
IR
IR
=
=
10 mA
1 mA
20
15
15
±
±
150
100
ppm/˚C (max)
ppm/˚C
Coefficient (Note 8)
IR = 100 µA
ZOUT
Dynamic Output
Impedance
IR = 1 mA, f = 120 Hz,
IAC = 0.1 IR
VOUT = VREF
VOUT 10V
VOUT = VREF
10 Hz ≤ f ≤ 10 kHz
Reference Voltage Long t = 1000 hrs, IR = 100 µA
0.3
2
Ω
Ω
=
eN
Wideband Noise
IR = 100 µA
20
µVrms
∆VREF
120
ppm
±
T = 25˚C 0.1˚C
Term Stability
7
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Electrical Characteristics (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 T
(maximum junction temperature), θ (junction to
JA
Jmax
ambient thermal resistance), and T (ambient temperature). The maximum allowable power dissipation at any temperature is PD
= (T
− T )/θ or the
Jmax A JA
A
max
number given in the Absolute Maximum Ratings, whichever is lower. For the LM4041, T
= 125˚C, and the typical thermal resistance (θ ), when board mounted,
JA
Jmax
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 T = 25˚C and represent most likely parametric norm.
J
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
±
[(∆V v∆T)(max ∆T)(V )]. Where, ∆V /∆T is the V temperature coefficient, max∆T is the maximum difference in temperature from the reference point of 25 ˚C
R
R
R
R
to T
or T
, and V is the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature range where
MIN R
MAX
max∆T=65˚C is shown below:
±
±
±
A-grade: 0.75% = 0.1% 100 ppm/˚C x 65˚C
±
±
±
B-grade: 0.85% = 0.2% 100 ppm/˚C x 65˚C
±
±
±
C-grade: 1.15% = 0.5% 100 ppm/˚C x 65˚C
±
±
±
D-grade: 1.98% = 1.0% 150 ppm/˚C x 65˚C
±
±
±
E-grade: 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: 1.2% = 0.2% 100 ppm/˚C x 100˚C
±
±
±
C-grade: 1.5% = 0.5% 100 ppm/˚C x 100˚C
±
±
±
D-grade: 2.5% = 1.0% 150 ppm/˚C x 100˚C
±
±
±
E-grade: 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 V ≤ 1.6V, the LM4041-ADJ in the SOT-23 package must operate at reduced I . This is caused by the series resistance of the die attach between
OUT
R
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.
Typical Performance Characteristics
Temperature Drift for Different
Average Temperature Coefficient
Output Impedance vs Frequency
DS011392-19
DS011392-4
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Typical Performance Characteristics (Continued)
Noise Voltage
Reverse Characteristics and
Minimum Operating Current
DS011392-5
DS011392-9
Start-Up
Characteristics
DS011392-8
DS011392-7
Reference Voltage vs Output
Voltage and Temperature
Reference Voltage vs Temperature
and Output Voltage
DS011392-11
DS011392-10
9
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Typical Performance Characteristics (Continued)
Feedback Current vs Output
Voltage and Temperature
Output Saturation
(SOT-23 Only)
DS011392-33
DS011392-12
Output Impedance vs Frequency
Output Impedance vs Frequency
DS011392-13
DS011392-14
Reverse Characteristics
DS011392-16
DS011392-15
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10
Typical Performance Characteristics (Continued)
Large Signal Response
DS011392-18
DS011392-17
Functional Block Diagram
DS011392-21
*LM4041-ADJ only
**LM4041-1.2 only
11
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Applications Information
The LM4041 is a precision micro-power curvature-corrected
bandgap shunt voltage reference. For space critical applica-
tions, 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.
where VO is the output voltage. The actual value of the
internal VREF is a function of VO. The “corrected” VREF is
determined by
VREF = ∆VO (∆VREF/∆VO) + VY
(2)
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
In a conventional shunt regulator application (Figure 1), an
external series resistor (RS) is connected between the sup-
ply 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.
DS011392-22
FIGURE 1. Shunt Regulator
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.
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
feedback resistors as shown in Figure 2 . The output voltage
is found using the equation
DS011392-34
VO = VREF[(R2/R1) + 1]
VO = VREF[(R2/R1) + 1]
(1)
FIGURE 2. Adjustable Shunt Regulator
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12
Typical Applications (Continued)
DS011392-24
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.
DS011392-20
DS011392-23
FIGURE 4. Voltage Level Detector
FIGURE 5. Voltage Level Detector
13
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Typical Applications (Continued)
DS011392-35
FIGURE 8. Bidirectional Adjustable
DS011392-25
±
±
Clamp 18V to 2.4V
FIGURE 6. Fast Positive Clamp
2.4V + VD1
DS011392-26
±
FIGURE 7. Bidirectional Clamp 2.4V
DS011392-36
FIGURE 9. Bidirectional Adjustable
±
±
Clamp 2.4V to 6V
DS011392-37
FIGURE 10. Simple Floating Current Detector
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14
Typical Applications (Continued)
DS011392-38
FIGURE 11. Current Source
Note 9: *D1 can be any LED, V = 1.5V to 2.2V at 3 mA. D1 may act as an indicator. D1 will be on if I
falls below the threshold current, except with I = 0.
F
THRESHOLD
DS011392-39
FIGURE 12. Precision Floating Current Detector
15
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Typical Applications (Continued)
DS011392-28
DS011392-29
FIGURE 13. Precision 1 µA to 1 mA Current Sources
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16
Physical Dimensions inches (millimeters) unless otherwise noted
Plastic Surface Mount Package (M3)
NS Package Number MF03A
(JEDEC Registration TO-236AB)
17
www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Package (SC70)
NS Package Number MAA05A
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18
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Plastic Package (Z)
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.
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
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
National Semiconductor
Europe
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
Fax: +49 (0) 180-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
Email: ap.support@nsc.com
www.national.com
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.
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