LM4041CIM3-1.2 [ROCHESTER]
1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.225V, PDSO3, PLASTIC, TO-236AB, SOT-23, 3 PIN;
| 型号： | LM4041CIM3-1.2 |
| 厂家： | 
Rochester Electronics |
| 描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.225V, PDSO3, PLASTIC, TO-236AB, SOT-23, 3 PIN 光电二极管 输出元件 |
| 文件： | 总20页 (文件大小：1427K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 2005
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
60µA to 12mA
j
j
j
j
Wide operating current range
Industrial temperature range
Extended temperature range
Low temperature coefficient
−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%
(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 Portable, Battery-Powered Equipment
n Data Acquisition Systems
n Instrumentation
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
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
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Connection Diagrams (Continued)
TO-92
01139203
01139232
Bottom View
See NS Package Number Z03A
Ordering Information
Reverse
Breakdown
Voltage
Package
M3 (SOT-23)
M7 (SC70)
Z (TO-92)
Tolerance at 25˚C
and Average
Reverse
Breakdown
Voltage
Temperature
Coefficient
0.1%, 100
NS
Package
Number
Supplied as 1000 Supplied as 3000 Supplied as 1000 Supplied as 3000
Units Tape and
Reel
Units Tape and
Reel
Units Tape and
Reel
Units Tape and
Reel
LM4041AIM3-1.2
LM4041BIM3-1.2
LM4041AIM3X-1.2
LM4041AIZ-1.2 MF03A,
Z03A
ppm/˚C max (A
grade)
0.2%, 100
LM4041BIM3X-1.2 LM4041BIM7-1.2 LM4041BIM7X-1.2 LM4041BIZ-1.2 MF03A,
ppm/˚C max (B
grade)
Z03A,
MAA05A
0.5%, 100
LM4041CEM3-1.2
LM4041CIM3-1.2
LM4041CEM3X-1.2 LM4041CIM7-1.2 LM4041CIM7X-1.2 LM4041CIZ-1.2 MF03A,
LM4041CIM3X-1.2 LM4041CIM7-ADJ LM4041CIM7X-ADJ LM4041CIZ-ADJ Z03A,
ppm/˚C max (C
grade)
LM4041CEM3-ADJ LM4041CEM3X-ADJ
LM4041CIM3-ADJ LM4041CIM3X-ADJ
MAA05A
1.0%, 150
ppm/˚C max (D
grade)
LM4041DEM3-1.2
LM4041DIM3-1.2
LM4041DEM3X-1.2 LM4041DIM7-1.2 LM4041DIM7X-1.2 LM4041DIZ-1.2 MF03A,
LM4041DIM3X-1.2 LM4041DIM7-ADJ LM4041DIM7X-ADJ LM4041DIZ-ADJ Z03A,
LM4041DEM3-ADJ LM4041DEM3X-ADJ
LM4041DIM3-ADJ LM4041DIM3X-ADJ
MAA05A
2.0%, 150
ppm/˚C max (E
grade)
LM4041EEM3-1.2
LM4041EIM3-1.2
LM4041EEM3X-1.2 LM4041EIM7-1.2 LM4041EIM7X-1.2 LM4041EIZ-1.2 MF03A,
LM4041EIM3X-1.2
Z03A,
MAA05A
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2
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%
3
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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
Reverse Current
20 mA
10 mA
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
Forward Current
Maximum Output Voltage
(LM4041-ADJ)
15V
Power Dissipation (TA = 25˚C) (Note 2)
M3 Package
Operating Ratings(Notes 1, 2)
306 mW
550 mW
Temperature Range
Industrial Temperature Range
Extended Temperature Range
Reverse Current
(Tmin ≤ TA ≤ Tmax)
Z Package
−40˚C ≤ TA ≤ +85˚C
−40˚C ≤ TA ≤ +125˚C
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
Vapor phase (60 seconds)
Infrared (15 seconds)
Z Package
+215˚C
+220˚C
Output Voltage Range
LM4041-ADJ
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)
LM4041AIZ
Limits
(Note 5)
LM4041BIZ
LM4041BIM7
Limits
(Limit)
(Note 5)
VR
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 100 µA
IR = 100 µA
1.225
45
V
mV (max)
mV (max)
µA
1.2
2.4
9.2
10.4
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
Voltage Temperature
IR = 1 mA
100
100
Coefficient (Note 6)
IR = 100 µA
15
∆VR/∆IR Reverse Breakdown Voltage
Change with Operating
Current Change
IRMIN ≤ IR ≤ 1 mA
0.7
1.5
1.5
mV (max)
mV (max)
mV
2.0
2.0
(Note 9)
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
IR = 100 µA
120
ppm
%
VHYST
Thermal Hysteresis
(Note 10)
∆T = −40˚C to +125˚C
0.08
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4
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 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
LM4041CIM7 LM4041DIM7 LM4041EIM7
Units
(Limit)
Limits
Limits (Note
Limits
(Note 5)
5)
(Note 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
Coefficient (Note 6)
IR = 1 mA
100
150
150
ppm/˚C (max)
ppm/˚C
IR= 100 µA
15
∆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
(Note 9)
1 mA ≤ IR ≤ 12 mA
2.5
0.5
20
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
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
IR = 100 µA
120
ppm
%
VHYST
Thermal Hysteresis
(Note 10)
∆T = −40˚C to +125˚C
0.08
5
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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)
Limits
Limits
Limits
(Limit)
(Note 5)
(Note 5)
(Note 5)
VR
Reverse Breakdown
Voltage
IR = 100 µA
1.225
V
Reverse Breakdown
Voltage Error
(Note 6)
IR = 100 µA
6
12
25
mV (max)
18.4
31
43
mV (max)
µA
IRMIN
Minimum Operating
Current
45
60
65
65
µA (max)
µA (max)
ppm/˚C
ppm/˚C
(max)
68
73
73
∆VR/∆T VR Temperature
IR= 10 mA
IR = 1 mA
20
15
Coefficient(Note 6)
100
150
150
IR = 100 µA
15
ppm/˚C
mV
∆VR/∆IR Reverse Breakdown
Change with
IRMIN ≤ IR ≤ 1.0 mA
0.7
1.5
2.0
2.0
mV (max)
mV (max)
mV
Current
2.0
2.5
2.5
(Note 9)
1 mA ≤ IR ≤ 12 mA
2.5
0.5
20
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,
IAC= 0.1 IR
1.5
2.0
2.0
Ω (max)
eN
∆VR
Noise Voltage
IR = 100 µA
µVrms
10 Hz ≤ f ≤ 10 kHz
t = 1000 hrs
Long Term Stability
(Non-Cumulative)
T = 25˚C 0.1˚C
IR = 100 µA
120
ppm
%
VHYST
Thermal Hysteresis
(Note 10)
∆T = −40˚C to +125˚C
0.08
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6
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
(Note 4)
LM4041CIZ
LM4041DIZ
(Limit)
LM4041CIM7 LM4041DIM7
(Note 5)
(Note 5)
VREF
Reference Voltage
Reference Voltage
Tolerance (Note 8)
Minimum Operating
Current
IR = 100 µA, VOUT = 5V
IR = 100 µA, VOUT = 5V
1.233
V
6.2
12
mV (max)
mV (max)
µA
14
24
IRMIN
45
0.7
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)
1.5
2.0
mV (max)
mV (max)
mV
2.0
2.5
(Note 9)
1 mA ≤ IR ≤ 12 mA
SOT-23: VOUT ≥ 1.6V (Note 7)
2
4
6
mV (max)
mV (max)
mV/V
6
8
∆VREF/∆VO Reference Voltage
Change
IR = 1 mA
−1.55
−2.0
−2.5
mV/V (max)
mV/V (max)
with Output Voltage
Change
−2.5
−3.0
IFB
Feedback Current
60
nA
100
150
nA (max)
nA (max)
ppm/˚C
120
200
∆VREF/∆T
Average Reference
Voltage Temperature
Coefficient (Note 8)
VOUT = 5V,
IR
IR
=
=
10 mA
1 mA
20
15
15
100
150
ppm/˚C (max)
ppm/˚C
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
VHYST
120
ppm
%
Term Stability
Thermal Hysteresis
(Note 10)
T = 25˚C 0.1˚C
∆T = −40˚C to +125˚C
0.08
7
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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)
V
(Note 4)
1.233
(Note 5)
(Note 5)
VREF
Reference Voltage
Reference Voltage
Tolerance (Note 8)
Minimum Operating
Current
IR = 100 µA, VOUT = 5V
IR = 100 µA, VOUT = 5V
6.2
12
mV (max)
mV (max)
µA
18
30
IRMIN
45
0.7
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
(Note 9)
1 mA ≤ IR ≤ 12 mA
SOT-23: VOUT ≥ 1.6V(Note 7)
2
8
10
mV (max)
mV (max)
mV/V
6
8
∆VREF/∆VO Reference Voltage
Change
IR = 1 mA
−1.55
−2.0
−2.5
mV/V (max)
mV/V (max)
with Output Voltage
Change
−3.0
−4.0
IFB
Feedback Current
60
nA
100
150
nA (max)
nA (max)
ppm/˚C
120
200
∆VREF/∆T
Average Reference
Voltage Temperature
Coefficient (Note 8)
VOUT = 5V,
IR
IR
=
=
10 mA
1 mA
20
15
15
100
150
ppm/˚C (max)
ppm/˚C
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
VHYST
120
ppm
%
Term Stability
Thermal Hysteresis
(Note 10)
T = 25˚C 0.1˚C
∆T = −40˚C to +125˚C
0.08
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8
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 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
A
max
Jmax A JA
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,
Jmax
JA
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
R
OUT
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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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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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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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
feedback resistors as shown in Figure 2 . The output voltage
is found using the equation
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.
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
VREF = ∆VO (∆VREF/∆VO) + VY
(2)
where
and
VY = 1.240 V
∆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 re-
sulting VOUT delta shift between the 25˚C measurements is
thermal hysteresis. Thermal hysteresis is common in preci-
sion references and is induced by thermal-mechanical pack-
age stress. Changes in environmental storage temperature,
operating temperature and board mounting temperature are
all factors that can contribute to thermal hysteresis.
01139222
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.
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.
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
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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.
01139220
01139223
FIGURE 4. Voltage Level Detector
FIGURE 5. Voltage Level Detector
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14
Typical Applications (Continued)
01139236
01139225
FIGURE 9. Bidirectional Adjustable
Clamp 2.4V to 6V
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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Typical Applications (Continued)
01139237
FIGURE 10. Simple Floating Current Detector
01139238
FIGURE 11. Current Source
Note 11: *D1 can be any LED, V = 1.5V to 2.2V at 3 mA. D1 may act as an
F
indicator. D1 will be on if I
with I = 0.
falls below the threshold current, except
THRESHOLD
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16
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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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
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18
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Plastic Package (Z)
NS Package Number Z03A
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.
For the most current product information visit us at www.national.com.
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