This is information on a product in full production.
July 2012 Doc ID 018817 Rev 3 1/16
16
LM4041xx
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 LM4041xx
2/16 Doc ID 018817 Rev 3
Contents
1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
LM4041xx Pin configuration
Doc ID 018817 Rev 3 3/16
1 Pin configuration
* This pin must be left floating or connected to Anode pin.
Figure 1. Pin connection (top view)
AM09377v1 AM09378v1
SOT23-3L SOT323-5L
Maximum ratings LM4041xx
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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
IKReverse breakdown current 20 mA
IFForward current 10 mA
PD
Power dissipation (1)
SOT23-3L
SOT323-5L
500
536
mW
TSTG Storage temperature - 65 to +150 °C
ESD
Human Body Model (HBM) 2 kV
Machine Model (MM) 200 V
Charged Device Model 1500 V
TLEAD Lead temperature (soldering) 10 sec 260 °C
TJMax junction temperature +150 °C
1. PD has been calculated with TAMB = 25°C and TJMAX = 150 °C.
Table 2. Thermal data
Symbol Parameter SOT323-5L SOT23-3L Unit
RthJA Thermal resistance junction-ambient 233 248 °C/W
RthJC Thermal resistance junction-case 90 136 °C/W
Table 3. Operating conditions
Symbol Parameter Value Unit
IKMIN Minimum operating current 40 µA
IKMAX Maximum operating current 12 mA
TOPER Operating free air temperature range Industrial - 40 to + 85 °C
Extended - 40 to + 125
LM4041xx Electrical characteristics
Doc ID 018817 Rev 3 5/16
3 Electrical characteristics
TAMB = 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
Vk Reverse breakdown
voltage
Ik = 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
Ikmin
Minimum operating
current
Tamb = 25 °C 25 40 µA
-40 °C < Tamb < Tmax (1) 50
ΔVk/ΔT Average temperature
coefficient (2) Ik = 100 µA ± 36 ± 100 ppm/°C
ΔVk/ΔIk
Reverse breakdown
voltage change with
operating current range
Ikmin < Ik < 1 mA
- 40 °C < Tamb < Tmax (1) 0.4 1
1.5 mV
1 mA < Ik < 12 mA
- 40 °C < Tamb < Tmax (1) 48
10
Rka Static impedance ΔIk = 100 µA to 1 mA 0.4 1 Ω
Kvh Long term stability Ik = 100 µA, t = 1000 hrs 120 ppm
enWide band noise Ik = 100 µA, 10 Hz < f < 10 kHz 60 µVRMS
1. Tmax = 85 °C for LM4041xI (industrial version) and Tmax = 125 °C for LM4041xE (extended version).
2. The average temperature coefficient is defined as: 106 x {max(ΔVk) / [Vk@25°C x (Tmax-Tmin)]} [ppm/°C].
Typical performance characteristics LM4041xx
6/16 Doc ID 018817 Rev 3
4 Typical performance characteristics
The following plots are referred to the typical application circuit and, unless otherwise noted,
at TA = 25 °C.
Figure 2. Vk 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
VK (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)
LM4041xx Typical performance characteristics
Doc ID 018817 Rev 3 7/16
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 LM4041xx
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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 trademark.
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°
LM4041xx Package mechanical data
Doc ID 018817 Rev 3 9/16
Figure 9. SOT23-3L dimensions
7110469_B
Package mechanical data LM4041xx
10/16 Doc ID 018817 Rev 3
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°
LM4041xx Package mechanical data
Doc ID 018817 Rev 3 11/16
Figure 10. SOT323-5L dimensions
7091413/E
Package mechanical data LM4041xx
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Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A180 7.086
C 12.813.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N60 2.362
T 14.4 0.567
Ao 3.133.233.33 0.1230.127 0.131
Bo 3.07 3.17 3.27 0.120 0.124 0.128
Ko 1.27 1.37 1.47 0.050 0.054 0.0.58
Po 3.94.0 4.1 0.1530.157 0.161
P3.94.0 4.1 0.1530.157 0.161
Tape & reel SOT23-xL mechanical data
LM4041xx Package mechanical data
Doc ID 018817 Rev 3 13/16
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 175 180185 6.889 7.086 7.283
C 12.81313.2 0.504 0.512 0.519
D 20.2 0.795
N59.5 60 60.5 2.362
T 14.4 0.567
Ao 2.25 0.088
Bo 2.7 0.106
Ko 1.2 0.047
Po 3.94 4.1 0.1530.157 0.161
P3.84 4.2 0.1490.157 0.165
Tape & reel SOT323-xL mechanical data
Order codes LM4041xx
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6 Order codes
Table 7. 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
LM4041xx
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