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LM4040
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 reversebreakdown voltages of 2.048V, 2.500V, 3.000V, 3.3V,
4.096V, and 5.000V. Ideal for space-critical applications,
the LM4040 is offered in the subminiature 3-pin SC70
surface-mount package (1.8mm x 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, ensuring
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.
Applications
●●
●●
●●
●●
●●
Portable, Battery-Powered Equipment
Notebook Computers
Cell Phones
Industrial Process Controls
Automotive
19-1787; Rev 12; 5/19
Benefits and Features
●● 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 28μVRMS 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
●● AEC-Q100 Qualified - Refer to Ordering Information
table for /V parts
Ordering Information appears at end of data sheet.
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Absolute Maximum Ratings
Reverse Current (cathode to anode)..................................20mA
Forward Current (anode to cathode)...................................10mA
Continuous Power Dissipation (TA = +70°C)
3-Pin SC70 (derate 2.90mW/°C above +70°C)............235mW
3-Pin SOT23 (derate 3mW/°C above +70°C)...........238.1mW
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
Soldering Temperature (reflow)........................................ +260°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.
Package Information
3 SOT23
PACKAGE CODE
U3+1
Outline Number
21-0051
Land Pattern Number
90-0179
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θJA)
N/A
Junction to Case (θJC)
N/A
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θJA)
336°C/W
Junction to Case (θJC)
110.10°C/W
3 SC70
PACKAGE CODE
X3+2
Outline Number
21-0075
Land Pattern Number
90-0208
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θJA)
340°C/W
Junction to Case (θJC)
115°C/W
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θJA)
340.40°C/W
Junction to Case (θJC)
120°C/W
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
www.maximintegrated.com
Maxim Integrated │ 2
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Electrical Characteristics—2.048V
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance (Note 2)
Minimum Operating Current
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
SYMBOL
VR
VR
IRMIN
∆VR/∆T
TYP
MAX
2.046
2.048
2.050
LM4040B (0.2%)
2.044
2.048
2.052
LM4040C (0.5%)
2.038
2.048
2.058
LM4040D (1.0%)
2.028
2.048
2.068
LM4040A
±2.0
±15
LM4040B
±4.0
±17
LM4040C
±10
±23
LM4040D
±20
±41
LM4040A/B/C
45
65
LM4040D
45
70
IR = 10mA
±20
IR = 1mA
IRMIN ≤ IR ≤ 1mA
1mA ≤ IR ≤ 15mA
Reverse Dynamic
Impedance (Note 3)
ZR
Wideband Noise
eN
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TA = +25°C
MIN
LM4040A (0.1%)
LM4040A/B/C
±15
±100
LM4040D
±15
±150
IR = 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
Reverse Breakdown Voltage
Long-Term Stability
CONDITIONS
∆VR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
UNITS
V
mV
µA
ppm/°C
±15
LM4040A/B/C
0.3
1.0
LM4040D
0.3
1.2
LM4040A/B/C
2.5
8.0
LM4040D
2.5
10.0
LM4040A/B
0.3
0.8
LM4040C
0.3
0.9
LM4040D
0.3
1.1
mV
Ω
IR = 100µA, 10Hz ≤ f ≤ 10kHz
28
µVRMS
T = 1000h
120
ppm
Maxim Integrated │ 3
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Electrical Characteristics—2.500V
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance (Note 2)
Minimum Operating Current
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
SYMBOL
VR
VR
IRMIN
∆VR/∆T
TYP
MAX
2.4975
2.5000
2.5025
LM4040B (0.2%)
2.4950
2.5000
2.5050
LM4040C (0.5%)
2.4875
2.5000
2.5125
LM4040D (1.0%)
2.4750
2.5000
2.5250
LM4040A
±2.0
±19
LM4040B
±4.0
±21
LM4040C
±10
±29
LM4040D
±20
±49
LM4040A/B/C
45
65
LM4040D
45
70
IR = 10mA
±20
TA = +25°C
IR = 1mA
IRMIN ≤ IR ≤ 1mA
1mA ≤ IR ≤ 15mA
Reverse Dynamic
Impedance (Note 3)
ZR
Wideband Noise
eN
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MIN
LM4040A (0.1%)
LM4040A/B/C
±15
±100
LM4040D
±15
±150
IR = 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
Reverse Breakdown Voltage
Long-Term Stability
CONDITIONS
∆VR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
UNITS
V
mV
µA
ppm/°C
±15
LM4040A/B/C
0.3
1.0
LM4040D
0.4
1.2
LM4040A/B/C
2.5
8.0
LM4040D
2.5
10.0
LM4040A/B
0.3
0.8
LM4040C
0.3
0.9
LM4040D
0.3
1.1
mV
Ω
IR = 100µA, 10Hz ≤ f ≤ 10kHz
35
µVRMS
T = 1000h
120
ppm
Maxim Integrated │ 4
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Electrical Characteristics—3.000V
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance (Note 2)
Minimum Operating Current
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
SYMBOL
VR
VR
IRMIN
∆VR/∆T
TYP
MAX
2.997
3.000
3.003
LM4040B (0.2%)
2.994
3.000
3.006
LM4040C (0.5%)
2.985
3.000
3.015
LM4040D (1.0%)
2.970
3.000
3.030
LM4040A
±3.0
±22
LM4040B
±6.0
±26
LM4040C
±15
±34
TA = +25°C
LM4040D
±30
±59
LM4040A/B/C
45
67
LM4040D
45
70
IR = 10mA
±20
IR = 1mA
IRMIN ≤ IR ≤ 1mA
1mA ≤ IR ≤ 15mA
Reverse Dynamic
Impedance (Note 3)
ZR
Wideband Noise
eN
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MIN
LM4040A (0.1%)
LM4040A/B/C
±15
±100
LM4040D
±15
±150
IR = 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
Reverse Breakdown Voltage
Long-Term Stability
CONDITIONS
∆VR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
UNITS
V
mV
µA
ppm/°C
±15
LM4040A/B/C
0.3
1.0
LM4040D
0.3
1.2
LM4040A/B/C
2.5
8.0
LM4040D
2.5
10.0
LM4040A/B
0.3
0.8
LM4040C
0.3
0.9
LM4040D
0.3
1.1
mV
Ω
IR = 100µA, 10Hz ≤ f ≤ 10kHz
45
µVRMS
T = 1000h
120
ppm
Maxim Integrated │ 5
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Electrical Characteristics—3.300V
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance (Note 2)
Minimum Operating Current
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
SYMBOL
VR
VR
IRMIN
∆VR/∆T
TYP
MAX
3.2967
3.3000
3.3033
LM4040B (0.2%)
3.2934
3.3000
3.3066
LM4040C (0.5%)
3.2835
3.3000
3.3165
LM4040D (1.0%)
3.2670
3.3000
3.3330
LM4040A
±3.0
±22
LM4040B
±6.0
±26
LM4040C
±15
±34
TA = +25°C
LM4040D
±30
±59
LM4040A/B/C
45
67
LM4040D
45
70
IR = 10mA
±20
IR = 1mA
IRMIN ≤ IR ≤ 1mA
1mA ≤ IR ≤ 15mA
Reverse Dynamic
Impedance (Note 3)
ZR
Wideband Noise
eN
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MIN
LM4040A (0.1%)
LM4040A/B/C
±15
±100
LM4040D
±15
±150
IR = 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
Reverse Breakdown Voltage
Long-Term Stability
CONDITIONS
∆VR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
UNITS
V
mV
µA
ppm/°C
±15
LM4040A/B/C
0.3
1.0
LM4040D
0.3
1.2
LM4040A/B/C
2.5
8.0
LM4040D
2.5
10.0
LM4040A/B
0.3
0.8
LM4040C
0.3
0.9
LM4040D
0.3
1.1
mV
Ω
IR = 100µA, 10Hz ≤ f ≤ 10kHz
50
µVRMS
T = 1000h
120
ppm
Maxim Integrated │ 6
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Electrical Characteristics—4.096V
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance (Note 2)
Minimum Operating Current
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
SYMBOL
VR
VR
IRMIN
∆VR/∆T
CONDITIONS
MIN
TYP
MAX
LM4040A (0.1%)
4.092
4.096
4.100
LM4040B (0.2%)
4.088
4.096
4.104
LM4040C (0.5%)
4.076
4.096
4.116
LM4040D (1.0%)
4.055
4.096
4.137
LM4040A
±4.1
±31
LM4040B
±8.2
±35
LM4040C
±20
±47
LM4040D
±41
±81
LM4040A/B/C
50
73
LM4040D
50
78
IR = 10mA
±30
TA = +25°C
IR = 1mA
LM4040A/B/C
±20
±100
LM4040D
±20
±150
IR = 100µA
IRMIN ≤ IR ≤ 1mA
Reverse Breakdown Voltage
Change with Operating
Current Change
1mA ≤ IR ≤ 15mA
UNITS
V
mV
µA
ppm/°C
±15
LM4040A/B/C
0.5
1.2
LM4040D
0.5
1.5
LM4040A/B/C
3.0
10.0
LM4040D
3.0
13.0
LM4040A/B/C
0.5
1.0
LM4040D
0.5
1.3
mV
Reverse Dynamic
Impedance (Note 3)
ZR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
Wideband Noise
eN
IR = 100µA, 10Hz ≤ f ≤ 10kHz
64
µVRMS
T = 1000h
120
ppm
Reverse Breakdown Voltage
Long-Term Stability
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∆VR
Ω
Maxim Integrated │ 7
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Electrical Characteristics—5.000V
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance (Note 2)
Minimum Operating Current
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
SYMBOL
VR
VR
IRMIN
∆VR/∆T
CONDITIONS
TA = +25°C
MIN
TYP
MAX
LM4040A (0.1%)
4.995
5.000
5.005
LM4040B (0.2%)
4.990
5.000
5.010
LM4040C (0.5%)
4.975
5.000
5.025
LM4040D (1.0%)
4.950
5.000
5.050
LM4040A
±5.0
±38
LM4040B
±10
±43
LM4040C
±25
±58
LM4040D
±50
±99
LM4040A/B/C
54
80
LM4040D
54
85
IR = 10mA
±30
IR = 1mA
LM4040A/B/C
±20
±100
LM4040D
±20
±150
IR = 100µA
IRMIN ≤ IR ≤ 1mA
Reverse Breakdown Voltage
Change with Operating
Current Change
1mA ≤ IR ≤ 15mA
UNITS
V
mV
µA
ppm/°C
±15
LM4040A/B/C
0.5
1.4
LM4040D
0.5
1.8
LM4040A/B/C
3.5
12.0
LM4040D
3.5
15.0
LM4040A/B/C
0.5
1.1
LM4040D
0.5
1.5
mV
Reverse Dynamic
Impedance (Note 3)
ZR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
Wideband Noise
eN
IR = 100µA, 10Hz ≤ f ≤ 10kHz
80
µVRMS
T = 1000h
120
ppm
Reverse Breakdown Voltage
Long-Term Stability
∆VR
Ω
Note 1: All devices are 100% production tested at TA = +25°C and are guaranteed by design for TA = TMIN to TMAX, as specified.
Note 2: The overtemperature limit for Reverse Breakdown Voltage Tolerance is defined as the room-temperature Reverse
Breakdown Voltage Tolerance ±[(∆VR/∆T)(max∆T)(VR)], where ∆VR/∆T is the VR temperature coefficient, max∆T is the maximum difference in temperature from the reference point of +25°C to TMIN or TMAX, and VR is the reverse breakdown voltage. The total overtemperature tolerance for the different grades in the temperature range where max∆T = +65°C is shown
below:
A grade: ±0.75% = ±0.1% ±100ppm/°C x 65°C
B grade: ±0.85% = ±0.2% ±100ppm/°C x 65°C
C grade: ±1.15% = ±0.5% ±100ppm/°C x 65°C
D grade: ±1.98% = ±1.0% ±150ppm/°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:
A grade: ±1.1% = ±0.1% ±100ppm/°C x 100°C
B grade: ±1.2% = ±0.2% ±100ppm/°C x 100°C
C grade: ±1.5% = ±0.5% ±100ppm/°C x 100°C
D grade: ±2.5% = ±1.0% ±150ppm/°C x 100°C
Therefore, as an example, the A-grade LM4040-2.5 has an over-temperature reverse breakdown voltage tolerance of ±2.5V
x 0.75% = ±19mV.
Note 3: Guaranteed by design.
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Maxim Integrated │ 8
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Typical Operating Characteristics
(IR = 100μA, SC70-3 package, TA = +25°C, unless otherwise noted.)
3
2
LM4040_I_3-2.5
1
0
LM4040_I_3-2.1
0
50
-1
-2
-3
-4
-5
100
-50
REVERSE CURRENT (µA)
25
50
75
100
TA = +125°C
4
TA = -40°C
3
TA = +25°C
TA = +85°C
2
1
0
5
10
ISHUNT (mA)
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125
LM4040 toc03
0
-5
-10
-15
-20
-25
-50
TEMPERATURE (°C)
LM4040-04
REVERSE VOLTAGE CHANGE (mV)
0
15
20
0
25
50
75
100
125
TEMPERATURE (°C)
LM4040-2.5V
REVERSE VOLTAGE vs. ISHUNT
5
0
-25
5
LM4040-5.0V
REVERSE VOLTAGE vs. ISHUNT
6
LM4040 toc05
LM4040_I_3-3.0
0
REVERSE VOLTAGE CHANGE (mV)
REVERSE VOLTAGE (V)
5
4
1
LM4040-02
LM4040_I_3-5.0
REFERENCE VOLTAGE CHANGE (mV)
LM4040_I_3-4.1
LM4040-01
6
LM4040-5.0V
TEMPERATURE DRIFT
LM4040-2.5V
TEMPERATURE DRIFT
REFERENCE VOLTAGE CHANGE (mV)
REVERSE CHARACTERISTICS AND
MINIMUM OPERATING CURRENT
TA = -40°C
5
4
TA = +125°C
3
TA = +85°C
2
1
0
TA = +25°C
0
5
10
15
20
ISHUNT (mA)
Maxim Integrated │ 9
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Typical Operating Characteristics (continued)
(IR = 100μA, SC70-3 package, TA = +25°C, unless otherwise noted.)
LM4040-2.5V
LOAD-TRANSIENT RESPONSE
LM4040-5.0V
LOAD-TRANSIENT RESPONSE
LM4040-06
VGEN
VGEN
10mV/div
10µs/div
40µs/div
ISHUNT = 1mA ± 250µA
RL = 10kΩ, SEE FIGURE 1
LM4040-2.5V
LOAD-TRANSIENT RESPONSE
LM4040-09
LM4040-5.0V
LOAD-TRANSIENT RESPONSE
LM4040-10
LM4040-11
+2.5mA
VGEN
+2.5mA
VGEN
VGEN
+250µA
-2.5mA
VR AC-COUPLED
-250µA
10mV/div
10mV/div
10ms/div
ISHUNT = 100µA ± 25µA
RL = 100kΩ, SEE FIGURE 1
LM4040-5.0V
LOAD-TRANSIENT RESPONSE
VR AC-COUPLED
-250µA
VR AC-COUPLED
-25µA
CH1: VGEN 2V/div
CH2: VR AC-COUPLED 2mV/div
ISHUNT = 100µA ± 25µA, RL = 100kΩ, SEE FIGURE 1
20mV/div
10µs/div
ISHUNT = 1mA ± 250µA
RL = 10kΩ, SEE FIGURE 1
+250µA
10µs/div
-2.5mA
VR AC-COUPLED
VR AC-COUPLED
2mV/div
LM4040-08
+25µA
VR AC-COUPLED
VGEN
+25µA
-25µA
LM4040-2.5V
LOAD-TRANSIENT RESPONSE
LM4040-07
20mV/div
10µs/div
ISHUNT = 10mA ± 2.5mA
RL = 1kΩ, SEE FIGURE 1
ISHUNT = 10mA ± 2.5mA
RL = 1kΩ, SEE FIGURE 1
ISHUNT
VB
+
-
1kΩ
VR
RL
VGEN
Figure 1. Load-Transient Test Circuit
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Maxim Integrated │ 10
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Typical Operating Characteristics (continued)
(IR = 100μA, SC70-3 package, TA = +25°C, unless otherwise noted.)
LM4040-5.0V
STARTUP CHARACTERISTICS
LM4040-13
0V
5V
0V
1V
0V
2V
0
8
C1 = 0
IR = 1mA
RS = 16kΩ
SEE FIGURE 2
12 16 20 24 28 32 36
0
0.1
10 20 30 40 50 60 70 80 90
0.1k
1k
10k
100k
RESPONSE TIME (µs)
FREQUENCY (Hz)
LM4040-5.0V
OUTPUT IMPEDANCE vs. FREQUENCY
LM4040-2.5V
NOISE vs. FREQUENCY
LM4040-5.0V
NOISE vs. FREQUENCY
10
IR = 150µA
IR = 1µA
1
10,000
1000
1M
LM4040-17
10,000
NOISE (nV/√Hz)
C1 = 0
LM4040-16
LM4040-15
RESPONSE TIME (µs)
NOISE (nV/√Hz)
IMPEDANCE (Ω)
100
4
IR = 150µA
10
1
0V
RS = 30kΩ
SEE FIGURE 2
C1 = 1µF
100
4V
VOUT
VOUT
2V
1000
IMPEDANCE (Ω)
5V
VIN
VIN
LM4040-12
LM4040-2.5V
OUTPUT IMPEDANCE vs. FREQUENCY
LM4040-14
LM4040-2.5V
STARTUP CHARACTERISTICS
1000
C1 = 1µF
0.1
0.1k
1k
10k
100k
1M
100
1
FREQUENCY (Hz)
10
100
1k
10k
100
1
10
100
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
RS
VIN
1Hz RATE
50%
DUTY CYCLE
VR
Figure 2. Startup Characteristics Test Circuit
www.maximintegrated.com
Maxim Integrated │ 11
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Pin Configuration
TOP VIEW
+
1
+
LM4040
3
N.C.*
- 2
SC70-3/SOT23-3
*PIN 3 MUST BE LEFT UNCONNECTED
OR CONNECTED TO PIN 2.
Pin Description
PIN
NAME
1
+
Positive Terminal of the Shunt Reference
FUNCTION
2
–
Negative Terminal of the Shunt Reference
3
N.C.
No connection. Leave this pin unconnected or connected to pin 2.
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Maxim Integrated │ 12
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Detailed Description
The LM4040 shunt references use the bandgap
principle to produce a stable, accurate voltage. The
device behaves similarly to an ideal zener diode; a
fixed voltage is maintained across its output terminals
when biased with 60μA to 15mA of reverse current. The
LM4040 behaves similarly to a silicon diode when biased
with forward currents up 10mA.
Figure 3 shows a typical operating circuit. The LM4040 is
ideal for providing a stable reference from a highvoltage
power supply.
VS
ISHUNT + ILOAD
RS
ILOAD
VR
ISHUNT
LM4040
Applications Information
The device’s internal pass transistor is used to maintain
a constant output voltage (VSHUNT) by sinking the
necessary amount of current across a source resistor.
The source resistance (RS) is determined from the load
current (ILOAD) range, supply voltage (VS) variations,
VSHUNT, and desired quiescent current.
Choose the value of RS when VS is at a minimum and
ILOAD is at a maximum. Maintain a minimum ISHUNT of
60μA at all times. The RS value should be large enough to
keep ISHUNT less than 15mA for proper regulation when
VS is maximum and ILOAD is at a minimum. To prevent
damage to the device, ISHUNT should never exceed
20mA.
Therefore, the value of RS is bounded by the following
equation:
[VS(MIN) - VR ] / [60μA + ILOAD(MAX)] > RS >
[VS(MAX) - VR ] / [20mA + ILOAD(MIN)]
Choosing a larger resistance minimizes the total power
dissipation in the circuit by reducing the shunt current
(PD(TOTAL) = VS x ISHUNT). Provide a safety margin to
incorporate the worst-case tolerance of the resistor used.
Ensure that the resistor’s power rating is adequate, using
the following general power equation:
PDR = ISHUNT x (VS(MAX) - VSHUNT)
Output Capacitance
The device does not require an external capacitor for
frequency stability and is stable for any output capacitance.
www.maximintegrated.com
Figure 3. Typical Operating Circuit
Temperature Performance
The LM4040 typically exhibits an output voltage temperature
coefficient within ±15ppm/°C. The polarity of the temperature
coefficient may be different from one device to another;
some may have positive coefficients, and others may
have negative coefficients.
High-Temperature Operation
The maximum junction temperature of the LM4040 is
+150°C. The maximum operating temperature for the
LM4040_E_ is +125°C. At a maximum load current of
15mA and a maximum output voltage of 5V, the part will
dissipate 75mW of power. The power dissipation limits
of the 3-pin SC70 call for a derating value of 2.17mW/°C
above +70°C and, therefore, for 75mW of power dissipation,
the part will selfheat to 35.56°C above ambient temperature.
If the ambient temperature is +125°C, the part operates
at 159.56°C, thereby exceeding the maximum junction
temperature value of +150°C. For high-temperature
operation, care must be taken to ensure the combination
of ambient temperature, output power dissipation and
package thermal resistance does not conspire to raise
the device temperature beyond that listed in the Absolute
Maximum Ratings. Either reduce the output load current or
the ambient temperature to keep the part within the limits.
Maxim Integrated │ 13
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Ordering Information
OUTPUT
VOLTAGE (V)
INITIAL
ACCURACY
(%)
TEMPCO
(ppm/°C)
LM4040AIM3-2.1+T
2.048
0.1
100
LM4040AIX3-2.1+T
2.048
0.1
100
PART
PIN-PACKAGE
TOP
MARK
-40°C to +85°C
3 SOT23
FZEF
-40°C to +85°C
3 SC70
ABJ
TEMP RANGE
LM4040BIM3-2.1+T
2.048
0.2
100
-40°C to +85°C
3 SOT23
FZEG
LM4040BIX3-2.1+T
2.048
0.2
100
-40°C to +85°C
3 SC70
ABK
LM4040CIM3-2.1+T
2.048
0.5
100
-40°C to +85°C
3 SOT23
FZEH
LM4040CIX3-2.1+T
2.048
0.5
100
-40°C to +85°C
3 SC70
ABL
LM4040DIM3-2.1+T
2.048
1.0
150
-40°C to +85°C
3 SOT23
FZEI
LM4040DIX3-2.1+T
2.048
1.0
150
-40°C to +85°C
3 SC70
ABM
LM4040AEM3-2.1+T
2.048
0.1
100
-40°C to +125°C
3 SOT23
FZNG
LM4040AEX3-2.1+T
2.048
0.1
100
-40°C to +125°C
3 SC70
ALF
LM4040BEM3-2.1-T
2.048
0.2
100
-40°C to +125°C
3 SOT23
FZNH
LM4040BEX3-2.1-T
2.048
0.2
100
-40°C to +125°C
3 SC70
ALG
LM4040CEM3-2.1-T
2.048
0.5
100
-40°C to +125°C
3 SOT23
FZNI
LM4040CEX3-2.1+T
2.048
0.5
100
-40°C to +125°C
3 SC70
ALH
LM4040DEM3-2.1+T
2.048
1.0
150
-40°C to +125°C
3 SOT23
FZNJ
LM4040DEX3-2.1+T
2.048
1.0
150
-40°C to +125°C
3 SC70
ALI
LM4040AIM3-2.5+T
2.500
0.1
100
-40°C to +85°C
3 SOT23
FZEJ
LM4040AIX3-2.5+T
2.500
0.1
100
-40°C to +85°C
3 SC70
ABN
LM4040BIM3-2.5+T
2.500
0.2
100
-40°C to +85°C
3 SOT23
FZEK
LM4040BIX3-2.5+T
2.500
0.2
100
-40°C to +85°C
3 SC70
ABO
LM4040BIM3-2.5/V+T
2.500
0.2
100
-40°C to +125°C
3 SOT23
FZWL
LM4040CIM3-2.5+T
2.500
0.5
100
-40°C to +85°C
3 SOT23
FZEL
LM4040CIX3-2.5+T
2.500
0.5
100
-40°C to +85°C
3 SC70
ABP
LM4040DIM3-2.5+T
2.500
1.0
150
-40°C to +85°C
3 SOT23
FZEM
LM4040DIX3-2.5+T
2.500
1.0
150
-40°C to +85°C
3 SC70
ABQ
LM4040AEM3-2.5+T
2.500
0.1
100
-40°C to +125°C
3 SOT23
FZNK
LM4040AEX3-2.5+T
2.500
0.1
100
-40°C to +125°C
3 SC70
ALJ
LM4040BEM3-2.5+T
2.500
0.2
100
-40°C to +125°C
3 SOT23
FZNL
LM4040BEX3-2.5+T
2.500
0.2
100
-40°C to +125°C
3 SC70
ALK
LM4040CEM3-2.5+T
2.500
0.5
100
-40°C to +125°C
3 SOT23
FZNM
LM4040CEM3-2.5/V+T*
2.500
0.5
100
-40°C to +125°C
3 SOT23
FZVZ
LM4040CEX3-2.5+T
2.500
0.5
100
-40°C to +125°C
3 SC70
ALL
LM4040DEM3-2.5+T
2.500
1.0
150
-40°C to +125°C
3 SOT23
FZNN
LM4040DEX3-2.5+T
2.500
1.0
150
-40°C to +125°C
3 SC70
ALM
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*Denotes future product—contact factory for availability.
www.maximintegrated.com
Maxim Integrated │ 14
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Ordering Information (continued)
PART
OUTPUT
VOLTAGE (V)
INITIAL
ACCURACY
(%)
TEMPCO
(ppm/°C)
TEMP RANGE
PIN-PACKAGE
TOP
MARK
LM4040AIM3-3.0+T
3.000
0.1
100
-40°C to +85°C
3 SOT23
FZEN
LM4040AIX3-3.0+T
3.000
0.1
100
-40°C to +85°C
3 SC70
ABR
LM4040BIM3-3.0+T
3.000
0.2
100
-40°C to +85°C
3 SOT23
FZEO
LM4040BIX3-3.0+T
3.000
0.2
100
-40°C to +85°C
3 SC70
ABS
LM4040CIM3-3.0+T
3.000
0.5
100
-40°C to +85°C
3 SOT23
FZEP
LM4040CIX3-3.0+T
3.000
0.5
100
-40°C to +85°C
3 SC70
ABT
LM4040DIM3-3.0+T
3.000
1.0
150
-40°C to +85°C
3 SOT23
FZEQ
LM4040DIX3-3.0+T
3.000
1.0
150
-40°C to +85°C
3 SC70
ABU
LM4040AEM3-3.0+T
3.000
0.1
100
-40°C to +125°C
3 SOT23
FZNO
LM4040AEM3-3.0/V+T
3.000
0.1
100
-40°C to +125°C
3 SOT23
FZWW
LM4040AEX3-3.0+T
3.000
0.1
100
-40°C to +125°C
3 SC70
ALN
LM4040AEX3-3.0/V+T
3.000
0.1
100
-40°C to +125°C
3 SC70
ALN
LM4040BEM3-3.0+T
3.000
0.2
100
-40°C to +125°C
3 SOT23
FZNP
LM4040BEX3-3.0+T
3.000
0.2
100
-40°C to +125°C
3 SC70
ALO
LM4040CEX3-3.0+T
3.000
0.5
100
-40°C to +125°C
3 SC70
ALP
LM4040DEM3-3.0+T
3.000
1.0
150
-40°C to +125°C
3 SOT23
FZNR
LM4040DEX3-3.0+T
3.000
1.0
150
-40°C to +125°C
3 SC70
ALQ
LM4040AEX3-3.3+T
3.300
0.1
100
-40°C to +125°C
3 SC70
ANY
LM4040BEX3-3.3+T
3.300
0.2
100
-40°C to +125°C
3 SC70
ANZ
LM4040CEX3-3.3+T
3.300
0.5
100
-40°C to +125°C
3 SC70
AOA
LM4040DEX3-3.3+T
3.300
1.0
150
-40°C to +125°C
3 SC70
AOB
LM4040AIM3-4.1+T
4.096
0.1
100
-40°C to +85°C
3 SOT23
FZER
LM4040AIX3-4.1+T
4.096
0.1
100
-40°C to +85°C
3 SC70
ABV
LM4040BIM3-4.1+T
4.096
0.2
100
-40°C to +85°C
3 SOT23
FZES
LM4040BIX3-4.1+T
4.096
0.2
100
-40°C to +85°C
3 SC70
ABW
LM4040CIM3-4.1+T
4.096
0.5
100
-40°C to +85°C
3 SOT23
FZET
LM4040CIX3-4.1+T
4.096
0.5
100
-40°C to +85°C
3 SC70
ABX
LM4040DIM3-4.1+T
4.096
1.0
150
-40°C to +85°C
3 SOT23
FZEU
LM4040DIX3-4.1+T
4.096
1.0
150
-40°C to +85°C
3 SC70
ABY
LM4040AEM3-4.1+T
4.096
0.1
100
-40°C to +125°C
3 SOT23
FZNS
LM4040AEX3-4.1+T
4.096
0.1
100
-40°C to +125°C
3 SC70
ALR
LM4040BEM3-4.1+T
4.096
0.2
100
-40°C to +125°C
3 SOT23
FZNT
LM4040BEM3-4.1/V+T
4.096
0.2
100
-40°C to +125°C
3 SOT23
FZXX
LM4040BEX3-4.1+T
4.096
0.2
100
-40°C to +125°C
3 SC70
ALS
LM4040CEM3-4.1+T
4.096
0.5
100
-40°C to +125°C
3 SOT23
FZNU
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
www.maximintegrated.com
Maxim Integrated │ 15
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Ordering Information (continued)
OUTPUT
VOLTAGE (V)
INITIAL
ACCURACY
(%)
TEMPCO
(ppm/°C)
LM4040CEX3-4.1+T
4.096
0.5
100
-40°C to +125°C
3 SC70
ALT
LM4040DEM3-4.1+T
4.096
1.0
150
-40°C to +125°C
3 SOT23
FZNV
PART
TEMP RANGE
PIN-PACKAGE
TOP
MARK
LM4040DEM3-4.1/V+T*
4.096
1.0
150
-40°C to +125°C
3 SOT23
FZWA
LM4040DEX3-4.1+T
4.096
1.0
150
-40°C to +125°C
3 SC70
ALU
LM4040AIM3-5.0+T
5.000
0.1
100
-40°C to +85°C
3 SOT23
FZEV
LM4040AIM3-5.0/V+T*
5.000
0.1
100
-40°C to +85°C
3 SOT23
+FZWB
LM4040AIX3-5.0+T
5.000
0.1
100
-40°C to +85°C
3 SC70
ABZ
LM4040BIM3-5.0+T
5.000
0.2
100
-40°C to +85°C
3 SOT23
FZEW
LM4040BIX3-5.0+T
5.000
0.2
100
-40°C to +85°C
3 SC70
ACA
LM4040CIM3-5.0+T
5.000
0.5
100
-40°C to +85°C
3 SOT23
FZEX
LM4040CIX3-5.0+T
5.000
0.5
100
-40°C to +85°C
3 SC70
ACB
LM4040DIM3-5.0+T
5.000
1.0
150
-40°C to +85°C
3 SOT23
FZEY
LM4040DIX3-5.0+T
5.000
1.0
150
-40°C to +85°C
3 SC70
ACC
LM4040AEM3-5.0+T
5.000
0.1
100
-40°C to +125°C
3 SOT23
FZNW
LM4040AEM3-5.0/V+T
5.000
0.1
100
-40°C to +125°C
3 SOT23
FZWB
LM4040AEX3-5.0+T
5.000
0.1
100
-40°C to +125°C
3 SC70
ALV
LM4040BEM3-5.0+T
5.000
0.2
100
-40°C to +125°C
3 SOT23
FZNX
LM4040BEX3-5.0+T
5.000
0.2
100
-40°C to +125°C
3 SC70
ALW
LM4040CEM3-5.0+T
5.000
0.5
100
-40°C to +125°C
3 SOT23
FZNY
LM4040CEM3-5.0/V+T
5.000
0.5
100
-40°C to +125°C
3 SOT23
+FZWC
LM4040CEX3-5.0+T
5.000
0.5
100
-40°C to +125°C
3 SC70
ALX
LM4040DEM3-5.0+T
5.000
1.0
150
-40°C to +125°C
3 SOT23
FZNZ
LM4040DEX3-5.0+T
5.000
1.0
150
-40°C to +125°C
3 SC70
ALY
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*Denotes future product—contact factory for availability.
Chip Information
PROCESS: BiCMOS
www.maximintegrated.com
Maxim Integrated │ 16
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
8/00
Initial release
5
7/05
Updated Electrical Characteristics
6
4/11
Updated Selector Guide, Absolute Maximum Ratings, and Ordering
Information
1, 2, 12, 13, 14
7
11/11
Add /V+ automotive-qualified identification to the Selector Guide and
Ordering Information
1, 12
8
3/13
Updated Ordering Information and removed Selector Guide
DESCRIPTION
—
2–7
1, 13, 14
9
1/16
Added /V part to Ordering Information table
13
10
10/17
Added AEC-Q100 qualification statement to Benefits and Features section
1
11
10/18
Updated Applications section, Absolute Maximum Ratings, Package
Information and Ordering Information
1, 2, 13–15
12
5/19
Updated Applications, Benefits and Features, Absolute Maximum Ratings,
Electrical Characteristics, Ordering Information, and added Package
Information section
1, 2, 14, 15
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2019 Maxim Integrated Products, Inc. │ 17
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