19-1787; Rev 5; 7/05
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
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 60µA 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 -40°C to +125°C.
For a 1.225V output version, refer to the LM4041 data
sheet.
♦
Ultra-Small 3-Pin SC70 Package
♦
0.1% (max) Initial Accuracy
♦
100ppm/°C (max) Temperature Coefficient
Guaranteed over -40°C to +125°C Temperature
Range
♦
Wide Operating Current Range: 60µA to 15mA
♦
Low 28µV
RMS
Output Noise (10Hz to 10kHz)
♦
2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V
Fixed Reverse Breakdown Voltages
♦
No Output Capacitors Required
♦
Tolerates Capacitive Loads
Features
LM4040
Selector Guide
PART
LM4040_IM3-2.1
LM4040_IX3-2.1
LM4040_EX3-2.1
LM4040_IM3-2.5
LM4040_IX3-2.5
LM4040_EX3-2.5
LM4040_IM3-3.0
LM4040_IX3-3.0
LM4040_EX3-3.0
LM4040_EX3-3.3
LM4040_IM3-4.1
LM4040_IX3-4.1
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
OUTPUT
PIN-
VOLTAGE
PACKAGE
(V)
3 SOT23-3
3 SC70-3
2.048
2.048
2.048
2.048
2.500
2.500
2.500
2.500
3.000
3.000
3.000
3.000
3.300
4.096
4.096
4.096
4.096
5.000
5.000
5.000
5.000
________________________Applications
Portable, Battery-Powered Equipment
Notebook Computers
Cell Phones
Industrial Process Controls
LM4040_EM3-2.1 -40°C to +125°C 3 SOT23-3
-40°C to +125°C 3 SC70-3
-40°C to +85°C
-40°C to +85°C
3 SOT23-3
3 SC70-3
LM4040_EM3-2.5 -40°C to +125°C 3 SOT23-3
-40°C to +125°C 3 SC70-3
-40°C to +85°C
-40°C to +85°C
3 SOT23-3
3 SC70-3
Pin Configuration
TOP VIEW
+
1
LM4040_EM3-3.0 -40°C to +125°C 3 SOT23-3
-40°C to +125°C 3 SC70-3
-40°C to +125°C 3 SC70-3
-40°C to +85°C
-40°C to +85°C
3 SOT23-3
3 SC70-3
LM4040
-
2
3
N.C.*
LM4040_EM3-4.1 -40°C to +125°C 3 SOT23-3
LM4040_EX3-4.1
LM4040_IM3-5.0
LM4040_IX3-5.0
LM4040_EX3-5.0
-40°C to +125°C 3 SC70-3
-40°C to +85°C
-40°C to +85°C
3 SOT23-3
3 SC70-3
SC70-3/SOT23-3
*PIN 3 MUST BE LEFT FLOATING
OR CONNECTED TO PIN 2.
LM4040_EM3-5.0 -40°C to +125°C 3 SOT23-3
-40°C to +125°C 3 SC70-3
Ordering Information appears at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
LM4040
ABSOLUTE MAXIMUM RATINGS
Reverse Current (cathode to anode) ..................................20mA
Forward Current (anode to cathode) ..................................10mA
Continuous Power Dissipation (T
A
= +70°C)
3-Pin SC70 (derate 2.17mW/°C above +70°C) ............174mW
3-Pin SOT23 (derate 4.01mW/°C above +70°C)..........320mW
Operating Temperature Range
LM4040_I_ _ _..................................................-40°C to +85°C
LM4040_E_ _ _ ..............................................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s)..................................+300°C
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.
ELECTRICAL CHARACTERISTICS—2.048V
(I
R
= 100µA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
LM4040A (0.1%)
Reverse Breakdown Voltage
V
R
T
A
= +25°C
LM4040B (0.2%)
LM4040C (0.5%)
LM4040D (1.0%)
LM4040A
Reverse Breakdown Voltage
Tolerance (Note 2)
V
R
LM4040B
LM4040C
LM4040D
Minimum Operating Current
I
RMIN
LM4040A/B/C
LM4040D
I
R
= 10mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
∆V
R
/∆T
I
R
= 1mA
I
R
= 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
I
RMIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
15mA
I
R
= 1mA, f = 120Hz,
I
AC
= 0.1I
R
LM4040A/B/C
LM4040D
LM4040A/B/C
LM4040D
LM4040A/B
Reverse Dynamic
Impedance (Note 3)
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
Z
R
e
N
∆V
R
LM4040C
LM4040D
LM4040A/B/C
LM4040D
MIN
2.046
2.044
2.038
2.028
TYP
2.048
2.048
2.048
2.048
±2.0
±4.0
±10
±20
45
45
±20
±15
±15
±15
0.3
0.3
2.5
2.5
0.3
0.3
0.3
28
120
1.0
1.2
8.0
10.0
0.8
0.9
1.1
µV
RMS
ppm
Ω
mV
±100
±150
ppm/°C
MAX
2.050
2.052
2.058
2.068
±15
±17
±23
±41
65
70
µA
mV
V
UNITS
I
R
= 100µA, 10Hz
≤
f
≤
10kHz
T = 1000h
2
_______________________________________________________________________________________
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
LM4040
ELECTRICAL CHARACTERISTICS—2.500V
(I
R
= 100µA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
LM4040A (0.1%)
Reverse Breakdown Voltage
V
R
T
A
= +25°C
LM4040B (0.2%)
LM4040C (0.5%)
LM4040D (1.0%)
LM4040A
Reverse Breakdown Voltage
Tolerance (Note 2)
V
R
LM4040B
LM4040C
LM4040D
Minimum Operating Current
I
RMIN
LM4040A/B/C
LM4040D
I
R
= 10mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
∆V
R
/∆T
I
R
= 1mA
I
R
= 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
I
RMIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
15mA
I
R
= 1mA, f = 120Hz,
I
AC
= 0.1I
R
LM4040A/B/C
LM4040D
LM4040A/B/C
LM4040D
LM4040A/B
Reverse Dynamic
Impedance (Note 3)
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
Z
R
e
N
∆V
R
LM4040C
LM4040D
LM4040A/B/C
LM4040D
MIN
2.4975
2.4950
2.4875
2.4750
TYP
2.5000
2.5000
2.5000
2.5000
±2.0
±4.0
±10
±20
45
45
±20
±15
±15
±15
0.3
0.4
2.5
2.5
0.3
0.3
0.3
35
120
1.0
1.2
8.0
10.0
0.8
0.9
1.1
µV
RMS
ppm
Ω
mV
±100
±150
ppm/°C
MAX
2.5025
2.5050
2.5125
2.5250
±19
±21
±29
±49
65
70
µA
mV
V
UNITS
I
R
= 100µA, 10Hz
≤
f
≤
10kHz
T = 1000h
_______________________________________________________________________________________
3
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
LM4040
ELECTRICAL CHARACTERISTICS—3.000V
(I
R
= 100µA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
LM4040A (0.1%)
Reverse Breakdown Voltage
V
R
T
A
= +25°C
LM4040B (0.2%)
LM4040C (0.5%)
LM4040D (1.0%)
LM4040A
Reverse Breakdown Voltage
Tolerance (Note 2)
V
R
LM4040B
LM4040C
LM4040D
Minimum Operating Current
I
RMIN
LM4040A/B/C
LM4040D
I
R
= 10mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
∆V
R
/∆T
I
R
= 1mA
I
R
= 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
I
RMIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
15mA
I
R
= 1mA, f = 120Hz,
I
AC
= 0.1I
R
LM4040A/B/C
LM4040D
LM4040A/B/C
LM4040D
LM4040A/B
Reverse Dynamic
Impedance (Note 3)
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
Z
R
e
N
∆V
R
LM4040C
LM4040D
LM4040A/B/C
LM4040D
MIN
2.997
2.994
2.985
2.970
TYP
3.000
3.000
3.000
3.000
±3.0
±6.0
±15
±30
45
45
±20
±15
±15
±15
0.3
0.3
2.5
2.5
0.3
0.3
0.3
45
120
1.0
1.2
8.0
10.0
0.8
0.9
1.1
µV
RMS
ppm
Ω
mV
±100
±150
ppm/°C
MAX
3.003
3.006
3.015
3.030
±22
±26
±34
±59
67
70
µA
mV
V
UNITS
I
R
= 100µA, 10Hz
≤
f
≤
10kHz
T = 1000h
4
_______________________________________________________________________________________
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—3.300V
(I
R
= 100µA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
LM4040A (0.1%)
Reverse Breakdown Voltage
V
R
T
A
= +25°C
LM4040B (0.2%)
LM4040C (0.5%)
LM4040D (1.0%)
LM4040A
Reverse Breakdown Voltage
Tolerance (Note 2)
V
R
LM4040B
LM4040C
LM4040D
Minimum Operating Current
I
RMIN
LM4040A/B/C
LM4040D
I
R
= 10mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
∆V
R
/∆T
I
R
= 1mA
I
R
= 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
I
RMIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
15mA
I
R
= 1mA, f = 120Hz,
I
AC
= 0.1I
R
LM4040A/B/C
LM4040D
LM4040A/B/C
LM4040D
LM4040A/B
Reverse Dynamic
Impedance (Note 3)
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
Z
R
e
N
∆V
R
LM4040C
LM4040D
LM4040A/B/C
LM4040D
MIN
3.2967
3.2934
3.2835
3.2670
TYP
3.3000
3.3000
3.3000
3.3000
±3.0
±6.0
±15
±30
45
45
±20
±15
±15
±15
0.3
0.3
2.5
2.5
0.3
0.3
0.3
50
120
1.0
1.2
8.0
10.0
0.8
0.9
1.1
µV
RMS
ppm
Ω
mV
±100
±150
ppm/°C
MAX
3.3033
3.3066
3.3165
3.3330
±22
±26
±34
±59
67
70
µA
mV
V
UNITS
LM4040
I
R
= 100µA, 10Hz
≤
f
≤
10kHz
T = 1000h
_______________________________________________________________________________________
5
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