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LM4041EIM7X-1.2 [TI]

LM4041 Precision Micropower Shunt Voltage Reference; LM4041精密微功耗并联型电压基准
LM4041EIM7X-1.2
型号： LM4041EIM7X-1.2
厂家： TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述：

LM4041 Precision Micropower Shunt Voltage Reference
LM4041精密微功耗并联型电压基准
文件： 总21页 (文件大小：806K)
中文：  中文翻译
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LM4041  
LM4041 Precision Micropower Shunt Voltage Reference  
Literature Number: SNOS641D  
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  
www.national.com  
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  
www.national.com  
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
www.national.com  
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  
www.national.com  
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
www.national.com  
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  
www.national.com  
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
www.national.com  
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  
www.national.com  
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
www.national.com  
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  
www.national.com  
10  
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  
www.national.com  
Typical Performance Characteristics (Continued)  
Reverse Characteristics  
01139216  
01139215  
Large Signal Response  
01139218  
01139217  
Functional Block Diagram  
01139221  
*LM4041-ADJ only  
**LM4041-1.2 only  
www.national.com  
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  
www.national.com  
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  
www.national.com  
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  
www.national.com  
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  
www.national.com  
16  
Typical Applications (Continued)  
01139239  
FIGURE 12. Precision Floating Current Detector  
01139229  
01139228  
FIGURE 13. Precision 1 µA to 1 mA Current Sources  
17  
www.national.com  
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  
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.  
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:  
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properly used in accordance with instructions for use  
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system, or to affect its safety or effectiveness.  
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