This is information on a product in full production.
February 2014 DocID018817 Rev 4 1/16
LM4041
Precision micropower shunt voltage reference
Datasheet
-
production data
Features
•Fixed 1.225 V typical output voltage
•Ultra low operating current: 40 µA at 25 °C
•High precision: +/- 0.1% @ 25 °C (0.2%, 0.5%
and 1% versions are also available)
•Stable when used with capacitive loads
•Industrial (- 40 to+ 85 °C) and Extended (- 40
to +125 °C) temperature range versions
available
•100 ppm/°C maximum temperature coefficient
•Available in SOT23-3L and SOT323-5L
packages
Applications
•Computers
•Battery chargers
•Switch mode power supply
•Battery operated equipment
•Data acquisition systems
•Energy management
•Instrumentation
Description
The LM4041 is a micropower shunt voltage
reference, providing a stable 1.225 V output
voltage, with an initial accuracy of 0.1% @ 25 °C
and a low temperature coefficient. Available in
SOT323-5L and SOT23-3L surface mount
packages, it can be designed in applications
where space saving is a critical issue. The low
operating current is a key advantage for power
restricted designs. In addition, the LM4041 is very
stable and can be used in a broad range of
application conditions.
SOT23-3L SOT323-5L
www.st.com
Contents LM4041
2/16 DocID018817 Rev 4
Contents
1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DocID018817 Rev 4 3/16
LM4041 Pin configuration
16
1 Pin configuration
Note: Below pins must be left floating or connected to Anode pin to improve noise immunity due to
PCB layout.
SOT23-3L: pin 3.
SOT323-5L: pin 2, pin 4 and pin 5.
Figure 1. Pin connection (top view)
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Maximum ratings LM4041
4/16 DocID018817 Rev 4
2 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
I
K
Reverse breakdown current 20 mA
V
K
Maximum cathode voltage 8 V
I
F
Forward current 10 mA
P
D
Power dissip a tio n
(1)
SOT23-3L
SOT323-5L 500
536 mW
T
STG
Storage temperature - 65 to +150 °C
ESD
Human bod y mod el (HBM) 2 kV
Machine model (MM) 200 V
Charged dev ic e model 1500 V
T
LEAD
Lead temperature (soldering) 10 sec 260 °C
T
J
Max junction temperature +150 °C
1. P
D
has been calculated with T
AMB
= 25°C and T
JMAX
= 150 °C.
Table 2. Thermal data
Symbol Parameter SOT323-5L SOT23-3L Unit
R
thJA
Thermal resistance junction-ambient 233 248 °C/W
R
thJC
Thermal res istance junction-cas e 90 136 °C/W
Table 3. Operating conditions
Symbol Parameter Value Unit
I
KMIN
Minimum operating current 40 µA
I
KMAX
Maximum operating current 12 mA
T
OPER
Operating free air temperature range Industrial - 40 to + 85 °C
Extended - 40 to + 125
DocID018817 Rev 4 5/16
LM4041 Electri cal chara ct er ist ics
16
3 Electrical characteristics
T
AMB
= 25 °C, unless otherwise specified.
Note: Limits are 100% production tested at 25 °C. Limits over temperature are guaranteed
through correlation and by design.
Table 4. Electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
k
Rever se brea kdown
voltage
I
k
= 100 µA
LM4041A, 0.1%
LM4041B, 0.2%
LM4041C, 0.5%
LM4041D, 1%
1.2238
1.2225
1.219
1.213
1.225 1.2262
1.2275
1.231
1.237
V
I
kmin
Minimum oper ating
current T
amb
= 25 °C 25 40 µA
-40 °C < T
amb
< T
max (1)
50
ΔV
k
/ΔT Average temperature
coefficient
(2)
I
k
= 100 µA ± 36 ± 100 ppm/°C
ΔV
k
/ΔI
k
Rever se brea kdown
voltage change with
operating current range
I
kmin
< I
k
< 1 mA
- 40 °C < T
amb
< T
max (1)
0.4 1
1.5 mV
1 mA < I
k
< 12 mA
- 40 °C < T
amb
< T
max (1)
48
10
R
ka
Static impedance ΔI
k
= 100 µA to 1 mA 0.4 1 W
K
vh
Long term stability I
k
= 100 µA, t = 1000 hrs 120 ppm
e
n
Wide band noise I
k
= 100 µA, 10 Hz < f < 10 kHz 60 µV
RMS
1. T
max
= 85 °C for LM4041xI (industrial version) and T
max
= 125 °C for LM4041xE (extended version).
2. The average temperature coefficient is defined as: 10
6
x {max(
Δ
V
k
)
/
[V
k@25°C
x (
T
max
-T
min
)]} [ppm/°C].
Typical performance characteristics LM4041
6/16 DocID018817 Rev 4
4 Typical performance characteristics
The following plots are referred to the typical application circuit and, unless otherwise noted,
at T
A
= 25 °C.
Figure 2. V
k
change vs. temperature Figure 3. Minimum current for regulation
Figure 4. Output impedance vs. frequency Figure 5. Minimum current for regulation vs.
temperature
1210
1215
1220
1225
1230
1235
1240
-40 -20 0 25 50 85 105 125
V
K
(mV)
TEMP (°C)
AM09371v1
AM09372v1
Reverse current I (µA)
K
VK(V)
1.2
10
30
50
70
0.4 0.8
AM09373v1
0.1
1
10
100
1000
100 1000 10000 100000 1000000
Frequency (Hz)
Impedance (Ohm)
CL=1µF
C = 0
Theoric C= 1µF
I = 1mA
I = 150µA
AM09374v1
0
10
20
30
40
50
60
-40 -20 0 25 50 85 105 125
IKMIN (µA)
TEMP (°C)
DocID018817 Rev 4 7/16
LM4041 Typical performance characteristics
16
Figure 6. Startup characteristics Figure 7. Startup measure circuit
AM09375v1
R
IK
VK
18 K
Pulse
Generator
f=100 KHz
Figure 8. Wideband noise voltage
AM09376v1
0
200
400
600
800
1000
1200
10 100 1000 10000 100000
Noise [nV/sqr (Hz)]
Frequency (Hz)
Package mechanical data LM4041
8/16 DocID018817 Rev 4
5 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions, and product status are available at: www.st.com.
ECOPACK is an ST tradema rk .
Figure 9. SOT23-3L dimensions
7110469_B
DocID018817 Rev 4 9/16
LM4041 Package mechanical data
16
Table 5. SOT23-3L mechanical data
Dim. mm.
Min. Typ. Max.
A 0.89 1.12
A1 0.01 0.10
A2 0.88 0.95 1.02
b 0.30 0.50
c 0.08 0.20
D 2.80 2.90 3.04
E 2.10 2.64
E1 1.20 1.30 1.40
e0.95
e1 1.90
L 0.40 0.50 0.60
L1 0.54
k0° 8°
Package mechanical data LM4041
10/16 DocID018817 Rev 4
Figure 10. SOT323-5L dimensions
7091413/E
DocID018817 Rev 4 11/16
LM4041 Package mechanical data
16
Table 6. SOT323-5L mechanical data
Dim. mm.
Min. Typ. Max.
A 0.80 1.10
A1 0 0.10
A2 0.80 0.90 1
b 0.15 0.30
c 0.10 0.22
D 1.80 2 2.20
E 1.80 2.10 2.40
E1 1.15 1.25 1.35
e0.65
e1 1.30
L 0.26 0.36 0.46
<0° 8°
Packagi ng mechan ic al data LM4041
12/16 DocID018817 Rev 4
6 Packaging mechanical data
Figure 11. Tape and reel SOT23-3L and SOT323-5L me chanic al drawing
DocID018817 Rev 4 13/16
LM4041 Packaging mechanical data
16
Table 7. Tape and reel SOT23-3L mechanical data
Dim. mm
Min. Typ. Max.
A180
C 12.8 13.0 13.2
D20.2
N60
T14.4
Ao 3.13 3.23 3.33
Bo 3.07 3.17 3.27
Ko 1.27 1.37 1.47
Po 3.9 4.0 4.1
P 3.9 4.0 4.1
Table 8. SOT323-5L mechanical data
Dim. mm.
Min. Typ. Max.
A 175 180 185
C 12.8 13 13.2
D 20.2
N 59.5 60 60.5
T14.4
Ao 2.25
Bo 2.7
Ko 1.2
Po 3.9 4 4.1
P 3.8 4 4.2
Order codes LM4041
14/16 DocID018817 Rev 4
7 Order codes
Table 9. Order codes
Order codes Precision Packages Operating temperature range Marking
LM4041AICT-1.2 0.1%
SOT323-5L Industrial
- 40 to + 85 °C
L2
LM4041BICT-1.2 0.2% L2
LM4041CICT-1.2 0.5% L25
LM4041DICT-1.2 1% L26
LM4041AILT-1.2 0.1%
SOT23-3L Industrial
- 40 to + 85 °C
L23
LM4041BILT-1.2 0.2% L24
LM4041CILT-1.2 0.5% L25
LM4041DILT-1.2 1% L26
LM4041AECT-1.2 0.1%
SOT323-5L Extended
- 40 to + 125 °C
E2
LM4041BECT-1.2 0.2% E2
LM4041CECT-1.2 0.5% E25
LM4041DECT-1.2 1% E26
LM4041AELT-1.2 0.1%
SOT23-3L Extended
- 40 to + 125 °C
E23
LM4041BELT-1.2 0.2% E24
LM4041CELT-1.2 0.5% E25
LM4041DELT-1.2 1% E26
DocID018817 Rev 4 15/16
LM4041 Revision history
16
8 Revision history
Table 10. Document revision history
Date Revision Changes
09-May-2011 1 Initial release.
05-Dec-2011 2 Changed maturity code and updated Table 9 on page 14.
25-Jul-2012 3 Added: marking order codes Table 9 on page 14.
18-Feb-2014 4
Part number LM4041xx changed to LM4041.
Updated Table 1: Ab solute maximum ratings, Section 1: Pin configuration and
Section 5: Package mechanical data.
Added Section 6: Packaging mechanical data.
Minor text changes.
LM4041
16/16 DocID018817 Rev 4
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