Datasheet LM4041DIM3X-1.2, LM4041DIM3-ADJ, LM4041DIM3-1.2, LM4041DEM3X-ADJ, LM4041DEM3X-1.2 Datasheet (NSC)

LM4041
Precision Micropower Shunt Voltage Reference

General Description

Ideal for space critical applications, the LM4041 precision
voltage reference is available in the sub-miniature (3 mm x

1.3 mm) SOT-23 surface-mountpackage.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 Small packages: SOT-23, and TO-92
n No output capacitor required
n Tolerates capacitive loads
n Reverse breakdown voltage options of 1.225V and

adjustable

Key Specifications (LM4041-1.2)

n Output voltage tolerance

(A grade, 25˚C)

±

0.1%(max)

n Low output noise

(10 Hz to 10kHz) 20µV

rms

n Wide operating current range 60µA to 12mA
n Industrial temperature range −40˚C to +85˚C
n Extended temperature range −40˚C to +125˚C
n Low temperature coefficient 100 ppm/˚C (max)

Applications

n Portable, Battery-Powered Equipment
n Data Acquisition Systems
n Instrumentation
n Process Control
n Energy Management
n Automotive
n Precision Audio Components

Connection Diagrams

SOT-23

DS011392-1

*This pin must be left floating or connected to pin 2.

DS011392-40

Top View

See NS Package Number M03B

(JEDEC Registration TO-236AB)

TO-92

DS011392-3

DS011392-32

Bottom View

See NS Package Number Z03A

October 1999

LM4041 Precision Micropower Shunt Voltage Reference

© 1999 National Semiconductor Corporation DS011392 www.national.com

Ordering Information

Reverse Breakdown

Voltage Tolerance at 25˚C

and Average Reverse Breakdown

Voltage Temperature Coefficient

Package

M3 (SOT-23) Z (TO-92)

±

0.1%, 100 ppm/˚C max (A grade) LM4041AIM3-1.2 LM4041AIZ-1.2

See NS Package See NS Package

Number M03B Number Z03A

±

0.2%, 100 ppm/˚C max (B grade) LM4041BIZ-1.2
LM4041BIM3-1.2

See NS Package See NS Package

Number M03B Number Z03A

±

0.5%, 100 ppm/˚C max (C grade) LM4041CEM3-1.2 LM4041CIZ-1.2,

LM4041CIM3-1.2 LM4041CEM3-ADJ LM4041CIZ-ADJ

LM4041CIM3-ADJ

See NS Package See NS Package

Number M03B Number Z03A

±

1.0%, 150 ppm/˚C max (D grade) LM4041DEM3-1.2 LM4041DIZ-1.2,

LM4041DIM3-1.2 LM4041DEM3-ADJ LM4041DIZ-ADJ

LM4041DIM3-ADJ

See NS Package See NS Package

Number M03B Number Z03A

±

2.0%, 150 ppm/˚C max (E grade) LM4041EEM3-1.2 LM4041EIZ-1.2
LM4041EIM3-1.2

See NS Package See NS Package

Number M03B Number Z03A

SOT-23 Package Marking Information

Only three fields of marking are possible on the SOT-23’s small surface. This table gives the meaning of the three fields.

Part Marking Field Definition

R1A First Field:
R1B R = Reference
R1C Second Field:
R1D 1 = 1.225V Voltage Option
R1E A = Adjustable

Third Field:
RAC A–E = Initial Reverse Breakdown
RAD Voltage or Reference Voltage Tolerance

A=

±

0.1%,B=±0.2%,C=±0.5%,D=±1.0%,E=±2.0

%

LM4041

www.national.com 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.

Reverse Current 20 mA
Forward Current 10 mA
Maximum Output Voltage

(LM4041-ADJ) 15V

Power Dissipation (T

A

= 25˚C) (Note 2)
M3 Package 306 mW
Z Package 550 mW

Storage Temperature −65˚C to +150˚C
Lead Temperature
M3 Packages

Vapor phase (60 seconds) +215˚C
Infrared (15 seconds) +220˚C

Z Package

Soldering (10 seconds) +260˚C

ESD Susceptibility

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.

Operating Ratings(Notes 1, 2)

Temperature Range (T

min

≤ TA≤ T

max

)

Industrial Temperature Range −40˚C ≤ T

A

≤ +85˚C

Extended Temperature Range −40˚C ≤ T

A

≤ +125˚C

Reverse Current

LM4041-1.2 60 µA to 12 mA
LM4041-ADJ 60 µA to 12 mA

Output Voltage Range

LM4041-ADJ 1.24V to 10V

LM4041-1.2
Electrical Characteristics (Industrial Temperature Range)

Boldface limits apply for TA=TJ=T

MIN

to T

MAX

; 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.

Typical LM4041AIM3 LM4041BIM3 Units

Symbol Parameter Conditions (Note 4) LM4041AIZ LM4041BIZ (Limit)

Limits Limits

(Note 5) (Note 5)

V

R

Reverse Breakdown Voltage IR= 100 µA 1.225 V
Reverse Breakdown Voltage I

R

= 100 µA

±

1.2

±

2.4 mV (max)

Tolerance (Note 6)

±

9.2

±

10.4 mV (max)

I

RMIN

Minimum Operating Current 45 µA

60 60 µA (max)
65 65 µA (max)

∆V

R

/∆T Average Reverse Breakdown

Voltage Temperature
Coefficient (Note 6)

I

R

=10mA

±

20 ppm/˚C

I

R

=1mA

±

15

±

100

±

100 ppm/˚C (max)

I

R

= 100 µA

±

15 ppm/˚C

∆V

R

/∆IRReverse Breakdown Voltage

Change with Operating
Current Change

I

RMIN

≤ IR≤ 1 mA 0.7 mV

1.5 1.5 mV (max)

2.0 2.0 mV (max)

1mA≤I

R

≤12 mA 4.0 mV

6.0 6.0 mV (max)

8.0 8.0 mV (max)

Z

R

Reverse Dynamic Impedance IR= 1 mA, f = 120 Hz, 0.5 Ω

I

AC

= 0.1 I

R

1.5 1.5 Ω (max)

e

N

Wideband Noise IR= 100 µA 20 µV

rms

10 Hz ≤ f ≤ 10 kHz

∆V

R

Reverse Breakdown Voltage
Long Term Stability

t = 1000 hrs
T = 25˚C

±

0.1˚C 120 ppm

I

R

= 100 µA

LM4041

www.national.com3

LM4041-1.2
Electrical Characteristics (Industrial Temperature Range)

Boldface limits apply for TA=TJ=T

MIN

to T

MAX

; 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.

LM4041EIM3

Typical LM4041CIM3 LM4041DIM3 LM4041EIZ Units

Symbol Parameter Conditions (Note 4) LM4041CIZ LM4041DIZ (Limit)

Limits Limits Limits

(Note 5) (Note 5) (Note 5)

V

R

Reverse Breakdown
Voltage

IR= 100 µA 1.225 V

Reverse Breakdown
Voltage

I

R

= 100 µA

±

6

±

12

±

25 mV (max)

Tolerance (Note 6)

±

14

±

24

±

36 mV (max)

I

RMIN

Minimum Operating
Current

45 µA

60 65 65 µA (max)
65 70 70 µA (max)

∆V

R

/∆TVRTemperature

Coefficient (Note 6)

IR=10mA

±

20 ppm/˚C

I

R

=1mA

±

15

±

100

±

150

±

150 ppm/˚C (max)

I

R

= 100 µA

±

15 ppm/˚C

∆V

R

/∆IRReverse Breakdown

Voltage Change with
Operating Current
Change

I

RMIN

≤ IR≤ 1 mA 0.7 mV

1.5 2.0 2.0 mV (max)

2.0 2.5 2.5 mV (max)

1mA≤I

R

≤12 mA 2.5 mV

6.0 8.0 8.0 mV (max)

8.0 10.0 10.0 mV (max)

Z

R

Reverse Dynamic
Impedance

IR= 1 mA,
f = 120 Hz

0.5 Ω

I

AC

= 0.1 I

R

1.5 2.0 2.0 Ω(max)

e

N

Wideband Noise IR= 100 µA 20 µV

rms

10 Hz ≤ f ≤ 10 kHz

∆V

R

Reverse Breakdown
Voltage Long Term
Stability

t = 1000 hrs
T = 25˚C

±

0.1˚C 120 ppm

I

R

= 100 µA

LM4041

www.national.com 4

LM4041-1.2
Electrical Characteristics (Extended Temperature Range)

Boldface limits apply for TA=TJ=T

MIN

to T

MAX

; 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.

LM4041CEM3 LM4041DEM3 LM4041EEM3

Typical Units

Symbol Parameter Conditions (Note 4) (Limit)

Limits Limits Limits

(Note 5) (Note 5) (Note 5)

V

R

Reverse Breakdown
Voltage

IR= 100 µA 1.225 V

Reverse Breakdown
Voltage Error

I

R

= 100 µA

±

6

±

12

±

25 mV (max)

(Note 6)

±

18.4

±

31

±

43 mV (max)

I

RMIN

Minimum Operating
Current

45 µA

60 65 65 µA (max)
68 73 73 µA (max)

∆V

R

/∆T VR Temperature

Coefficient(Note 6)

IR=10mA

±

20 ppm/˚C

I

R

=1mA

±

15

±

100

±

150

±

150 ppm/˚C

(max)

I

R

= 100 µA

±

15 ppm/˚C

∆V

R

/∆IRReverse Breakdown

Change with
Current

I

RMIN

≤ IR≤ 1.0 mA 0.7 mV

1.5 2.0 2.0 mV (max)

2.0 2.5 2.5 mV (max)

1mA≤I

R

≤12 mA 2.5 mV

6.0 8.0 8.0 mV (max)

8.0 10.0 10.0 mV (max)

Z

R

Reverse Dynamic
Impedance

IR=1mA,f=120
Hz,

0.5 Ω

I

AC

= 0.1 I

R

1.5 2.0 2.0 Ω (max)

e

N

Noise Voltage IR= 100 µA 20 µV

rms

10 Hz ≤ f ≤ 10 kHz

∆V

R

Long Term Stability
(Non-Cumulative)

t = 1000 hrs
T = 25˚C

±

0.1˚C 120 ppm

I

R

= 100 µA

LM4041

www.national.com5

LM4041-ADJ (Adjustable)
Electrical Characteristics (Industrial Temperature Range)

Boldface limits apply for TA=TJ=T

MIN

to T

MAX

; all other limits TJ= 25˚C unless otherwise specified (SOT-23, see (Note 7) ,

I

RMIN

≤ IR≤ 12 mA, V

REF

≤ V

OUT

≤ 10V. The grades C and D designate initial Reference Voltage Tolerances of±0.5%and

±

1%, respectively for V

OUT

= 5V.

Symbol Parameter Conditions

Typical

(Note

4)

Units

(Limit)

LM4041CIM3 LM4041DIM3

LM4041CIZ LM4041DIZ

(Note 5) (Note 5)

V

REF

Reference Voltage IR= 100 µA, V

OUT

= 5V 1.233 V

Reference Voltage I

R

= 100 µA, V

OUT

=5V

±

6.2

±

12 mV (max)

Tolerance (Note 8)

±

14

±

24 mV (max)

I

RMIN

Minimum Operating
Current

45 µA

60 65 µA (max)
65 70 µA (max)

∆V

REF

/∆IRReference Voltage

Change with Operating
Current Change

I

RMIN

≤ IR≤ 1 mA 0.7 mV

SOT-23: V

OUT

≥ 1.6V 1.5 2.0 mV (max)
(Note 7) 2.0 2.5 mV (max)
1mA≤I

R

≤12 mA 2 mV

SOT-23: V

OUT

≥ 1.6V(Note

7)

4 6 mV (max)

68mV (max)

∆V

REF

/∆VOReference Voltage

Change
with Output Voltage
Change

I

R

= 1 mA −1.55 mV/V

−2.0 −2.5 mV/V (max)

−2.5 −3.0 mV/V (max)

I

FB

Feedback Current 60 nA

100 150 nA (max)
120 200 nA (max)

∆V

REF

/∆T Average Reference

Voltage Temperature
Coefficient (Note 8)

V

OUT

= 5V, IR= 10 mA 20 ppm/˚C

I

R

= 1 mA 15

±

100

±

150 ppm/˚C (max)

I

R

= 100 µA 15 ppm/˚C

Z

OUT

Dynamic Output
Impedance

IR= 1 mA, f = 120 Hz,
I

AC

= 0.1 I

R

V

OUT=VREF

0.3 Ω

V

OUT

= 10V 2 Ω

e

N

Wideband Noise IR= 100 µA V

OUT=VREF

20 µV

rms

10 Hz ≤ f ≤ 10 kHz

∆V

REF

Reference Voltage Long t = 1000 hrs, IR= 100 µA 120 ppm
Term Stability T = 25˚C

±

0.1˚C

LM4041

www.national.com 6

LM4041-ADJ (Adjustable)
Electrical Characteristics (Extended Temperature Range)

Boldface limits apply for TA=TJ=T

MIN

to T

MAX

; all other limits TJ= 25˚C unless otherwise specified (SOT-23, see (Note 7) ,

I

RMIN

≤ IR≤ 12 mA, V

REF

≤ V

OUT

≤ 10V. The grades C and D designate initial Reference Voltage Tolerances of±0.5%and

±

1%, respectively for V

OUT

= 5V.

Symbol Parameter Conditions

Typical

(Note

4)

Units

(Limit)

LM4041CEM3 LM4041DEM3

(Note 5) (Note 5)

V

REF

Reference Voltage IR= 100 µA, V

OUT

= 5V 1.233 V

Reference Voltage I

R

= 100 µA, V

OUT

=5V

±

6.2

±

12 mV (max)

Tolerance (Note 8)

±

18

±

30 mV (max)

I

RMIN

Minimum Operating
Current

45 µA

60 65 µA (max)
68 73 µA (max)

∆V

REF

/∆IRReference Voltage

Change with Operating
Current Change

I

RMIN

≤ IR≤ 1 mA 0.7 mV

SOT-23: V

OUT

≥ 1.6V 1.5 2.0 mV (max)
(Note 7) 2.0 2.5 mV (max)
1mA≤I

R

≤12 mA 2 mV

SOT-23: V

OUT

≥ 1.6V(Note

7)

8 10 mV (max)

68mV (max)

∆V

REF

/∆VOReference Voltage

Change
with Output Voltage
Change

I

R

= 1 mA −1.55 mV/V

−2.0 −2.5 mV/V (max)

−3.0 −4.0 mV/V (max)

I

FB

Feedback Current 60 nA

100 150 nA (max)
120 200 nA (max)

∆V

REF

/∆T Average Reference

Voltage Temperature
Coefficient (Note 8)

V

OUT

= 5V, IR= 10 mA 20 ppm/˚C

I

R

= 1 mA 15

±

100

±

150 ppm/˚C (max)

I

R

= 100 µA 15 ppm/˚C

Z

OUT

Dynamic Output
Impedance

IR= 1 mA, f = 120 Hz,
I

AC

= 0.1 I

R

V

OUT=VREF

0.3 Ω

V

OUT

= 10V 2 Ω

e

N

Wideband Noise IR= 100 µA V

OUT=VREF

20 µV

rms

10 Hz ≤ f ≤ 10 kHz

∆V

REF

Reference Voltage Long t = 1000 hrs, IR= 100 µA 120 ppm
Term Stability T = 25˚C

±

0.1˚C

LM4041

www.national.com7

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

Jmax

(maximum junction temperature), θJA(junction to am-

bient thermal resistance), and T

A

(ambient temperature). The maximum allowable power dissipation at any temperature is PD

max

=(T

Jmax−TA

)/θJAor the number

given in the Absolute Maximum Ratings, whichever is lower. For the LM4041, T

Jmax

= 125˚C, and the typical thermal resistance (θJA), when board mounted, is

326˚C/W for the SOT-23 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 di-

rectly into each pin.
Note 4: Typicals are at T

J

= 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 VoltageTolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance

±

[(∆VR∆T)(max ∆T)(VR)]. Where, ∆VR/∆T is the VRtemperature coefficient, max∆T is the maximum difference in temperature from the reference point of 25 ˚C to

T

MAX

or T

MIN

, and VRis 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:±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

OUT

≤ 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.

Typical Performance Characteristics

Temperature Drift for Different
Average Temperature Coefficient

DS011392-19

Output Impedance vs Frequency

DS011392-4

LM4041

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Typical Performance Characteristics (Continued)

Noise Voltage

DS011392-5

Reverse Characteristics and
Minimum Operating Current

DS011392-9

Start-Up
Characteristics

DS011392-7

DS011392-8

Reference Voltage vs Output
Voltage and Temperature

DS011392-11

Reference Voltage vs Temperature
and Output Voltage

DS011392-10

LM4041

www.national.com9

Typical Performance Characteristics (Continued)

Feedback Current vs Output
Voltage and Temperature

DS011392-12

Output Saturation
(SOT-23 Only)

DS011392-33

Output Impedance vs Frequency

DS011392-13

Output Impedance vs Frequency

DS011392-14

Reverse Characteristics

DS011392-15

DS011392-16

LM4041

www.national.com 10

Typical Performance Characteristics (Continued)

Functional Block Diagram

Large Signal Response

DS011392-17

DS011392-18

DS011392-21

*LM4041-ADJ only
**LM4041-1.2 only

LM4041

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Applications Information

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
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.

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.

In a conventional shunt regulator application

(Figure 1)

,an

external series resistor (R

S

) is connected between the sup-

ply voltage and the LM4041. R

S

determines the current that

flows through the load (I

L

) and the LM4041 (IQ). Since load

current and supply voltage may vary, R

S

should be small

enough to supply at least the minimum acceptable I

Q

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 I

L

is at its minimum, RSshould
be large enough so that the current flowing through the
LM4041 is less than 12 mA.

R

S

should be selected based on the supply voltage, (VS), the

desired load and operating current, (I

L

and IQ), and the

LM4041’s reverse breakdown voltage, V

R

.

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 (V

REF

) and the ratio of the external

feedback resistors as shown in

Figure 2

. The output voltage

is found using the equation

V

O

=

V

REF

[(R2/R1) + 1] (1)

where V

O

is the output voltage. The actual value of the inter-

nal V

REF

is a function of VO. The “corrected” V

REF

is deter-

mined by

V

REF

=

∆V

O

(∆V

REF

/∆VO)+V

Y

(2)

where

V

Y

=

1.240 V and

∆V

O

=

(V

O−VY

)

∆V

REF

/∆VOis 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 V

REF

in equa-

tion (1) with the value found using equation (2).
Note that the actual output voltage can deviate from that pre-

dicted using the typical value of ∆V

REF

/∆VOin equation (2):

for C-grade parts, the worst-case ∆V

REF

/∆VOis −2.5 mV/V.

For D-grade parts, the worst-case ∆V

REF

/∆VOis −3.0 mV/V.

Typical Applications

DS011392-22

FIGURE 1. Shunt Regulator

DS011392-34

V

O

=

V

REF

[(R2/R1) + 1]

FIGURE 2. Adjustable Shunt Regulator

LM4041

www.national.com 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

FIGURE 4. Voltage Level Detector

DS011392-23

FIGURE 5. Voltage Level Detector

LM4041

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Typical Applications (Continued)

DS011392-25

FIGURE 6. Fast Positive Clamp

2.4V + V

D1

DS011392-26

FIGURE 7. Bidirectional Clamp±2.4V

DS011392-35

FIGURE 8. Bidirectional Adjustable

Clamp

±

18V to±2.4V

DS011392-36

FIGURE 9. Bidirectional Adjustable

Clamp

±

2.4V to±6V

DS011392-37

FIGURE 10. Simple Floating Current Detector

LM4041

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Typical Applications (Continued)

Note 9: *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 I

THRESHOLD

falls below the threshold current, except with I =

O.

DS011392-38

FIGURE 11. Current Source

DS011392-39

FIGURE 12. Precision Floating Current Detector

LM4041

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Typical Applications (Continued)

DS011392-28

DS011392-29

FIGURE 13. Precision 1 µA to 1 mA Current Sources

LM4041

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Physical Dimensions inches (millimeters) unless otherwise noted

Plastic Surface Mount Package (M3)

NS Package Number M03B

(JEDEC Registration TO-236AB)

Plastic Package (Z)

NS Package Number Z03A

LM4041

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Notes

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: [phone]
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Tel: [phone]
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LM4041 Precision Micropower Shunt Voltage Reference

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.