LM4040 DS
General Description
The LM4040 is a precision two-terminal shunt mode,
bandgap voltage reference available in fixed reverse
breakdown voltages of 2.048V, 2.500V, 3.000V, 3.3V,
4.096V, and 5.000V. Ideal for space-critical applica-
tions, the LM4040 is offered in the subminiature 3-pin
SC70 surface-mount package (1.8mm
1.8mm), 50%
smaller than comparable devices in SOT23 surface-
mount packages (SOT23 versions are also available).
Laser-trimmed resistors ensure precise initial accuracy.
With a 100ppm/C temperature coefficient, the device
is offered in four grades of initial accuracy ranging from
0.1% to 1%. The LM4040 has a 60A to 15mA shunt
current capability with low dynamic impedance, ensur-
ing stable reverse breakdown voltage accuracy over a
wide range of operating temperatures and currents.
The LM4040 does not require an external stabilizing
capacitor while ensuring stability with any capacitive
load.
The LM4040 is guaranteed over the temperature range
of -40C to +125C.
For a 1.225V output version, refer to the LM4041 data
sheet.
________________________Applications
Portable, Battery-Powered Equipment
Notebook Computers
Cell Phones
Industrial Process Controls
Features
o Ultra-Small 3-Pin SC70 Package
o 0.1% (max) Initial Accuracy
o 100ppm/C (max) Temperature Coefficient
Guaranteed over -40C to +125C Temperature
Range
o Wide Operating Current Range: 60A to 15mA
o Low 28V
RMS
Output Noise (10Hz to 10kHz)
o 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V
Fixed Reverse Breakdown Voltages
o No Output Capacitors Required
o Tolerates Capacitive Loads
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
________________________________________________________________ Maxim Integrated Products
1
-
1
3
N.C.*
+
LM4040
SC70-3/SOT23-3
TOP VIEW
2
*PIN 3 MUST BE LEFT FLOATING
OR CONNECTED TO PIN 2.
PART
TEMP RANGE
PIN-
PACKAGE
OUTPUT
VOLTAGE
(V)
LM4040_IM3-2.1
-40C to +85C
3 SOT23-3
2.048
LM4040_IX3-2.1
-40C to +85C
3 SC70-3
2.048
LM4040_EM3-2.1 -40C to +125C 3 SOT23-3
2.048
LM4040_EX3-2.1
-40C to +125C 3 SC70-3
2.048
LM4040_IM3-2.5
-40C to +85C
3 SOT23-3
2.500
LM4040_IX3-2.5
-40C to +85C
3 SC70-3
2.500
LM4040_EM3-2.5 -40C to +125C 3 SOT23-3
2.500
LM4040_EX3-2.5
-40C to +125C 3 SC70-3
2.500
LM4040_IM3-3.0
-40C to +85C
3 SOT23-3
3.000
LM4040_IX3-3.0
-40C to +85C
3 SC70-3
3.000
LM4040_EM3-3.0 -40C to +125C 3 SOT23-3
3.000
LM4040_EX3-3.0
-40C to +125C 3 SC70-3
3.000
LM4040_EX3-3.3
-40C to +125C 3 SC70-3
3.300
LM4040_IM3-4.1
-40C to +85C
3 SOT23-3
4.096
LM4040_IX3-4.1
-40C to +85C
3 SC70-3
4.096
LM4040_EM3-4.1 -40C to +125C 3 SOT23-3
4.096
LM4040_EX3-4.1
-40C to +125C 3 SC70-3
4.096
LM4040_IM3-5.0
-40C to +85C
3 SOT23-3
5.000
LM4040_IX3-5.0
-40C to +85C
3 SC70-3
5.000
LM4040_EM3-5.0 -40C to +125C 3 SOT23-3
5.000
LM4040_EX3-5.0
-40C to +125C 3 SC70-3
5.000
Pin Configuration
Selector Guide
19-1787; Rev 3; 3/03
Ordering Information appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS--2.048V
(I
R
= 100A, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Reverse Current (cathode to anode) ..................................20mA
Forward Current (anode to cathode) ..................................10mA
ESD per Method 3015.7
Human Body Model .......................................................2000V
Machine Model.................................................................200V
Continuous Power Dissipation (T
A
= +70C)
3-Pin SC70 (derate 2.17mW/C above +70C) ............174mW
3-Pin SOT23 (derate 4.01mW/C above +70C)..........320mW
Operating Temperature Range
LM4040_I_ _ _..................................................-40C to +85C
LM4040_E_ _ _ ..............................................-40C to +125C
Storage Temperature Range .............................-65C to +150C
Junction Temperature ......................................................+150C
Lead Temperature (soldering, 10s)..................................+300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LM4040A (0.1%)
2.046
2.048
2.050
LM4040B (0.2%)
2.044
2.048
2.052
LM4040C (0.5%)
2.038
2.048
2.058
Reverse Breakdown Voltage
V
R
T
A
= +25
C
LM4040D (1.0%)
2.028
2.048
2.068
V
LM4040A
2.0
15
LM4040B
4.0
17
LM4040C
10
23
Reverse Breakdown Voltage
Tolerance (Note 2)
V
R
LM4040D
20
41
mV
LM4040A/B/C
45
65
Minimum Operating Current
I
RMIN
LM4040D
45
70
A
I
R
= 10mA
20
LM4040A/B/C
15
100
I
R
= 1mA
LM4040D
15
150
Average Reverse Voltage
Temperature Coefficient
(Note 2)
V
R
/
T
I
R
= 100A
15
ppm/
C
LM4040A/B/C
0.3
1.0
I
RMIN
I
R
1mA
LM4040D
0.3
1.2
LM4040A/B/C
2.5
8.0
Reverse Breakdown Voltage
Change with Operating
Current Change
1mA
I
R
15mA
LM4040D
2.5
10.0
mV
LM4040A/B
0.3
0.8
LM4040C
0.3
0.9
Reverse Dynamic
Impedance (Note 3)
Z
R
I
R
= 1mA, f = 120Hz,
I
AC
= 0.1I
R
LM4040D
0.3
1.1
Wideband Noise
e
N
I
R
= 100A, 10Hz
f 10kHz
28
V
RMS
Reverse Breakdown Voltage
Long-Term Stability
V
R
T = 1000h
120
ppm
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS--2.500V
(I
R
= 100A, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LM4040A (0.1%)
2.4975
2.5000
2.5025
LM4040B (0.2%)
2.4950
2.5000
2.5050
LM4040C (0.5%)
2.4875
2.5000
2.5125
Reverse Breakdown Voltage
V
R
T
A
= +25
C
LM4040D (1.0%)
2.4750
2.5000
2.5250
V
LM4040A
2.0
19
LM4040B
4.0
21
LM4040C
10
29
Reverse Breakdown Voltage
Tolerance (Note 2)
V
R
LM4040D
20
49
mV
LM4040A/B/C
45
65
Minimum Operating Current
I
RMIN
LM4040D
45
70
A
I
R
= 10mA
20
LM4040A/B/C
15
100
I
R
= 1mA
LM4040D
15
150
Average Reverse Voltage
Temperature Coefficient
(Note 2)
V
R
/
T
I
R
= 100A
15
ppm/
C
LM4040A/B/C
0.3
1.0
I
RMIN
I
R
1mA
LM4040D
0.4
1.2
LM4040A/B/C
2.5
8.0
Reverse Breakdown Voltage
Change with Operating
Current Change
1mA
I
R
15mA
LM4040D
2.5
10.0
mV
LM4040A/B
0.3
0.8
LM4040C
0.3
0.9
Reverse Dynamic
Impedance (Note 3)
Z
R
I
R
= 1mA, f = 120Hz,
I
AC
= 0.1I
R
LM4040D
0.3
1.1
Wideband Noise
e
N
I
R
= 100A, 10Hz
f 10kHz
35
V
RMS
Reverse Breakdown Voltage
Long-Term Stability
V
R
T = 1000h
120
ppm
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS--3.000V
(I
R
= 100A, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LM4040A (0.1%)
2.997
3.000
3.003
LM4040B (0.2%)
2.994
3.000
3.006
LM4040C (0.5%)
2.985
3.000
3.015
Reverse Breakdown Voltage
V
R
T
A
= +25
C
LM4040D (1.0%)
2.970
3.000
3.030
V
LM4040A
3.0
22
LM4040B
6.0
26
LM4040C
15
34
Reverse Breakdown Voltage
Tolerance (Note 2)
V
R
LM4040D
30
59
mV
LM4040A/B/C
45
67
Minimum Operating Current
I
RMIN
LM4040D
45
70
A
I
R
= 10mA
20
LM4040A/B/C
15
100
I
R
= 1mA
LM4040D
15
150
Average Reverse Voltage
Temperature Coefficient
(Note 2)
V
R
/
T
I
R
= 100A
15
ppm/
C
LM4040A/B/C
0.3
1.0
I
RMIN
I
R
1mA
LM4040D
0.3
1.2
LM4040A/B/C
2.5
8.0
Reverse Breakdown Voltage
Change with Operating
Current Change
1mA
I
R
15mA
LM4040D
2.5
10.0
mV
LM4040A/B
0.3
0.8
LM4040C
0.3
0.9
Reverse Dynamic
Impedance (Note 3)
Z
R
I
R
= 1mA, f = 120Hz,
I
AC
= 0.1I
R
LM4040D
0.3
1.1
Wideband Noise
e
N
I
R
= 100A, 10Hz
f 10kHz
45
V
RMS
Reverse Breakdown Voltage
Long-Term Stability
V
R
T = 1000h
120
ppm
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS--3.300V
(I
R
= 100A, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LM4040A (0.1%)
3.2967
3.3000
3.3033
LM4040B (0.2%)
3.2934
3.3000
3.3066
LM4040C (0.5%)
3.2835
3.3000
3.3165
Reverse Breakdown Voltage
V
R
T
A
= +25
C
LM4040D (1.0%)
3.2670
3.3000
3.3330
V
LM4040A
3.0
22
LM4040B
6.0
26
LM4040C
15
34
Reverse Breakdown Voltage
Tolerance (Note 2)
V
R
LM4040D
30
59
mV
LM4040A/B/C
45
67
Minimum Operating Current
I
RMIN
LM4040D
45
70
A
I
R
= 10mA
20
LM4040A/B/C
15
100
I
R
= 1mA
LM4040D
15
150
Average Reverse Voltage
Temperature Coefficient
(Note 2)
V
R
/
T
I
R
= 100A
15
ppm/
C
LM4040A/B/C
0.3
1.0
I
RMIN
I
R
1mA
LM4040D
0.3
1.2
LM4040A/B/C
2.5
8.0
Reverse Breakdown Voltage
Change with Operating
Current Change
1mA
I
R
15mA
LM4040D
2.5
10.0
mV
LM4040A/B
0.3
0.8
LM4040C
0.3
0.9
Reverse Dynamic
Impedance (Note 3)
Z
R
I
R
= 1mA, f = 120Hz,
I
AC
= 0.1I
R
LM4040D
0.3
1.1
Wideband Noise
e
N
I
R
= 100A, 10Hz
f 10kHz
50
V
RMS
Reverse Breakdown Voltage
Long-Term Stability
V
R
T = 1000h
120
ppm
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