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 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
Benets 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
Ordering Information appears at end of data sheet.
19-1787; Rev 9; 1/16
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Reverse Current (cathode to anode)..................................20mA
Forward Current (anode to cathode) ..................................10mA
Continuous Power Dissipation (TA = +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
Soldering Temperature (reflow) ....................................... +260°C
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Reverse Breakdown Voltage VRTA = +25°C
LM4040A (0.1%) 2.046 2.048 2.050
V
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
Reverse Breakdown Voltage
Tolerance (Note 2) VR
LM4040A ±2.0 ±15
mV
LM4040B ±4.0 ±17
LM4040C ±10 ±23
LM4040D ±20 ±41
Minimum Operating Current IRMIN
LM4040A/B/C 45 65 µA
LM4040D 45 70
Average Reverse Voltage
Temperature Coefcient
(Notes 2 and 3)
∆VR/∆T
IR = 10mA ±20
ppm/°CIR = 1mA LM4040A/B/C ±15 ±100
LM4040D ±15 ±150
IR = 100µA ±15
Reverse Breakdown Voltage
Change with Operating
Current Change
IRMIN ≤ IR ≤ 1mA LM4040A/B/C 0.3 1.0
mV
LM4040D 0.3 1.2
1mA ≤ IR ≤ 15mA LM4040A/B/C 2.5 8.0
LM4040D 2.5 10.0
Reverse Dynamic
Impedance (Note 3) ZRIR = 1mA, f = 120Hz,
IAC = 0.1IR
LM4040A/B 0.3 0.8
Ω
LM4040C 0.3 0.9
LM4040D 0.3 1.1
Wideband Noise eNIR = 100µA, 10Hz ≤ f ≤ 10kHz 28 µVRMS
Reverse Breakdown Voltage
Long-Term Stability ∆VRT = 1000h 120 ppm
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
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Absolute Maximum Ratings
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
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Reverse Breakdown Voltage VRTA = +25°C
LM4040A (0.1%) 2.4975 2.5000 2.5025
V
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
Reverse Breakdown Voltage
Tolerance (Note 2) VR
LM4040A ±2.0 ±19
mV
LM4040B ±4.0 ±21
LM4040C ±10 ±29
LM4040D ±20 ±49
Minimum Operating Current IRMIN
LM4040A/B/C 45 65 µA
LM4040D 45 70
Average Reverse Voltage
Temperature Coefcient
(Notes 2 and 3)
∆VR/∆T
IR = 10mA ±20
ppm/°CIR = 1mA LM4040A/B/C ±15 ±100
LM4040D ±15 ±150
IR = 100µA ±15
Reverse Breakdown Voltage
Change with Operating
Current Change
IRMIN ≤ IR ≤ 1mA LM4040A/B/C 0.3 1.0
mV
LM4040D 0.4 1.2
1mA ≤ IR ≤ 15mA LM4040A/B/C 2.5 8.0
LM4040D 2.5 10.0
Reverse Dynamic
Impedance (Note 3) ZRIR = 1mA, f = 120Hz,
IAC = 0.1IR
LM4040A/B 0.3 0.8
ΩLM4040C 0.3 0.9
LM4040D 0.3 1.1
Wideband Noise eNIR = 100µA, 10Hz ≤ f ≤ 10kHz 35 µVRMS
Reverse Breakdown Voltage
Long-Term Stability ∆VRT = 1000h 120 ppm
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
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Electrical Characteristics—2.500V
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Reverse Breakdown Voltage VRTA = +25°C
LM4040A (0.1%) 2.997 3.000 3.003
V
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
Reverse Breakdown Voltage
Tolerance (Note 2) VR
LM4040A ±3.0 ±22
mV
LM4040B ±6.0 ±26
LM4040C ±15 ±34
LM4040D ±30 ±59
Minimum Operating Current IRMIN
LM4040A/B/C 45 67 µA
LM4040D 45 70
Average Reverse Voltage
Temperature Coefcient
(Notes 2 and 3)
∆VR/∆T
IR = 10mA ±20
ppm/°CIR = 1mA LM4040A/B/C ±15 ±100
LM4040D ±15 ±150
IR = 100µA ±15
Reverse Breakdown Voltage
Change with Operating
Current Change
IRMIN ≤ IR ≤ 1mA LM4040A/B/C 0.3 1.0
mV
LM4040D 0.3 1.2
1mA ≤ IR ≤ 15mA LM4040A/B/C 2.5 8.0
LM4040D 2.5 10.0
Reverse Dynamic
Impedance (Note 3) ZRIR = 1mA, f = 120Hz,
IAC = 0.1IR
LM4040A/B 0.3 0.8
ΩLM4040C 0.3 0.9
LM4040D 0.3 1.1
Wideband Noise eNIR = 100µA, 10Hz ≤ f ≤ 10kHz 45 µVRMS
Reverse Breakdown Voltage
Long-Term Stability ∆VRT = 1000h 120 ppm
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
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Electrical Characteristics—3.000V
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Reverse Breakdown Voltage VRTA = +25°C
LM4040A (0.1%) 3.2967 3.3000 3.3033
V
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
Reverse Breakdown Voltage
Tolerance (Note 2) VR
LM4040A ±3.0 ±22
mV
LM4040B ±6.0 ±26
LM4040C ±15 ±34
LM4040D ±30 ±59
Minimum Operating Current IRMIN
LM4040A/B/C 45 67 µA
LM4040D 45 70
Average Reverse Voltage
Temperature Coefcient
(Notes 2 and 3)
∆VR/∆T
IR = 10mA ±20
ppm/°CIR = 1mA LM4040A/B/C ±15 ±100
LM4040D ±15 ±150
IR = 100µA ±15
Reverse Breakdown Voltage
Change with Operating
Current Change
IRMIN ≤ IR ≤ 1mA LM4040A/B/C 0.3 1.0
mV
LM4040D 0.3 1.2
1mA ≤ IR ≤ 15mA LM4040A/B/C 2.5 8.0
LM4040D 2.5 10.0
Reverse Dynamic
Impedance (Note 3) ZRIR = 1mA, f = 120Hz,
IAC = 0.1IR
LM4040A/B 0.3 0.8
ΩLM4040C 0.3 0.9
LM4040D 0.3 1.1
Wideband Noise eNIR = 100µA, 10Hz ≤ f ≤ 10kHz 50 µVRMS
Reverse Breakdown Voltage
Long-Term Stability ∆VRT = 1000h 120 ppm
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
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Electrical Characteristics—3.300V
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Reverse Breakdown Voltage VRTA = +25°C
LM4040A (0.1%) 4.092 4.096 4.100
V
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
Reverse Breakdown Voltage
Tolerance (Note 2) VR
LM4040A ±4.1 ±31
mV
LM4040B ±8.2 ±35
LM4040C ±20 ±47
LM4040D ±41 ±81
Minimum Operating Current IRMIN
LM4040A/B/C 50 73 µA
LM4040D 50 78
Average Reverse Voltage
Temperature Coefcient
(Notes 2 and 3)
∆VR/∆T
IR = 10mA ±30
ppm/°CIR = 1mA LM4040A/B/C ±20 ±100
LM4040D ±20 ±150
IR = 100µA ±15
Reverse Breakdown Voltage
Change with Operating
Current Change
IRMIN ≤ IR ≤ 1mA LM4040A/B/C 0.5 1.2
mV
LM4040D 0.5 1.5
1mA ≤ IR ≤ 15mA LM4040A/B/C 3.0 10.0
LM4040D 3.0 13.0
Reverse Dynamic
Impedance (Note 3) ZRIR = 1mA, f = 120Hz,
IAC = 0.1IR
LM4040A/B/C 0.5 1.0 Ω
LM4040D 0.5 1.3
Wideband Noise eNIR = 100µA, 10Hz ≤ f ≤ 10kHz 64 µVRMS
Reverse Breakdown Voltage
Long-Term Stability ∆VRT = 1000h 120 ppm
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
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Electrical Characteristics—4.096V
(IR = 100μA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
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 max-
imum difference in temperature from the reference point of +25°C to TMIN or TMAX, and VR is the reverse breakdown volt-
age. 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.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Reverse Breakdown Voltage VRTA = +25°C
LM4040A (0.1%) 4.995 5.000 5.005
V
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
Reverse Breakdown Voltage
Tolerance (Note 2) VR
LM4040A ±5.0 ±38
mV
LM4040B ±10 ±43
LM4040C ±25 ±58
LM4040D ±50 ±99
Minimum Operating Current IRMIN
LM4040A/B/C 54 80 µA
LM4040D 54 85
Average Reverse Voltage
Temperature Coefcient
(Notes 2 and 3)
∆VR/∆T
IR = 10mA ±30
ppm/°CIR = 1mA LM4040A/B/C ±20 ±100
LM4040D ±20 ±150
IR = 100µA ±15
Reverse Breakdown Voltage
Change with Operating
Current Change
IRMIN ≤ IR ≤ 1mA LM4040A/B/C 0.5 1.4
mV
LM4040D 0.5 1.8
1mA ≤ IR ≤ 15mA LM4040A/B/C 3.5 12.0
LM4040D 3.5 15.0
Reverse Dynamic
Impedance (Note 3) ZRIR = 1mA, f = 120Hz,
IAC = 0.1IR
LM4040A/B/C 0.5 1.1 Ω
LM4040D 0.5 1.5
Wideband Noise eNIR = 100µA, 10Hz ≤ f ≤ 10kHz 80 µVRMS
Reverse Breakdown Voltage
Long-Term Stability ∆VRT = 1000h 120 ppm
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
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Electrical Characteristics—5.000V
(IR = 100μA, SC70-3 package, TA = +25°C, unless otherwise noted.)
LM4040-2.5V
TEMPERATURE DRIFT
LM4040-02
TEMPERATURE (°C)
REFERENCE VOLTAGE CHANGE (mV)
1007550250-25
-4
-3
-2
-1
0
1
-5
-50 125
LM4040-5.0V
TEMPERATURE DRIFT
LM4040 toc03
TEMPERATURE (°C)
REFERENCE VOLTAGE CHANGE (mV)
1007550250-25
-15
-10
-5
0
5
-20
-50 125
LM4040-2.5V
REVERSE VOLTAGE vs. ISHUNT
LM4040-04
ISHUNT (mA)
REVERSE VOLTAGE CHANGE (mV)
15105
1
2
3
4
5
0
0 20
TA = +125°C
TA = -40°C
TA = +25°C
TA = +85°C
LM4040-5.0V
REVERSE VOLTAGE vs. ISHUNT
LM4040 toc05
ISHUNT (mA)
REVERSE VOLTAGE CHANGE (mV)
15105
1
2
3
4
5
6
0
0 20
TA = -40°C
TA = +125°C
TA = +85°C
TA = +25°C
0
1
2
3
4
5
6
0 50 100
REVERSE CHARACTERISTICS AND
MINIMUM OPERATING CURRENT
LM4040-01
REVERSE CURRENT (µA)
REVERSE VOLTAGE (V)
LM4040_I_3-5.0
LM4040_I_3-4.1
LM4040_I_3-3.0
LM4040_I_3-2.5
LM4040_I_3-2.1
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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.)
Figure 1. Load-Transient Test Circuit
VGEN
VR AC-COUPLED
+25µA
-25µA
2mV/div
LM4040-2.5V
LOAD-TRANSIENT RESPONSE
LM4040-06
10µs/div
CH1: VGEN 2V/div
CH2: VR AC-COUPLED 2mV/div
ISHUNT = 100µA ± 25µA, RL = 100kΩ, SEE FIGURE 1
V
GEN
V
R
AC-COUPLED
+25µA
-25µA
10mV/div
LM4040-5.0V
LOAD-TRANSIENT RESPONSE
LM4040-07
40µs/div
ISHUNT = 100µA ± 25µA
RL = 100kΩ, SEE FIGURE 1
VGEN
VR AC-COUPLED
+250µA
-250µA
10mV/div
LM4040-2.5V
LOAD-TRANSIENT RESPONSE
LM4040-08
10ms/div
ISHUNT = 1mA ± 250µA
RL = 10kΩ, SEE FIGURE 1
VGEN
VR AC-COUPLED
+250µA
-250µA
10mV/div
LM4040-5.0V
LOAD-TRANSIENT RESPONSE
LM4040-09
10µs/div
ISHUNT = 1mA ± 250µA
RL = 10kΩ, SEE FIGURE 1
VGEN
VR AC-COUPLED
+2.5mA
-2.5mA
20mV/div
LM4040-2.5V
LOAD-TRANSIENT RESPONSE
LM4040-10
10µs/div
ISHUNT = 10mA ± 2.5mA
RL = 1kΩ, SEE FIGURE 1
VGEN
VR AC-COUPLED
+2.5mA
-2.5mA
20mV/div
LM4040-5.0V
LOAD-TRANSIENT RESPONSE
LM4040-11
10µs/div
ISHUNT = 10mA ± 2.5mA
RL = 1kΩ, SEE FIGURE 1
1kΩ
VB+
-
ISHUNT
VR
RL
VGEN
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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.)
Figure 2. Startup Characteristics Test Circuit
VIN
VOUT
LM4040-2.5V
STARTUP CHARACTERISTICS
LM4040-12
0 16 208 124 24 28 32 36
RESPONSE TIME (µs)
5V
0V
0V
2V
1V
RS = 30kΩ
SEE FIGURE 2
VIN
VOUT
LM4040-5.0V
STARTUP CHARACTERISTICS
LM4040-13
0 40 5020 3010 60 70 80 90
RESPONSE TIME (µs)
5V
0V
0V
4V
2V
RS = 16kΩ
SEE FIGURE 2
0.1k 10k1k 100k 1M
LM4040-2.5V
OUTPUT IMPEDANCE vs. FREQUENCY
LM4040-14
FREQUENCY (Hz)
IMPEDANCE (Ω)
1000
0.1
1
10
100
IR = 150µA
IR = 1mA
C1 = 1µF
C1 = 0
0.1k 10k1k 100k 1M
LM4040-5.0V
OUTPUT IMPEDANCE vs. FREQUENCY
LM4040-15
FREQUENCY (Hz)
IMPEDANCE (Ω)
100
0.1
1
10 IR = 150µA
IR = 1µA
C1 = 0
C1 = 1µF
1 10010 1k 10k
LM4040-2.5V
NOISE vs. FREQUENCY
LM4040-16
FREQUENCY (Hz)
10,000
100
1000
NOISE (nV/√Hz)
110010 1k 10k
LM4040-5.0V
NOISE vs. FREQUENCY
LM4040-17
FREQUENCY (Hz)
10,000
100
1000
NOISE (nV/√Hz)
RS
VIN
1Hz RATE
50%
DUTY CYCLE
VR
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
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Typical Operating Characteristics (continued)
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
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PIN NAME FUNCTION
1 + Positive Terminal of the Shunt Reference
2 – Negative Terminal of the Shunt Reference
3 N.C. No connection. Leave this pin unconnected or connected to pin 2.
Pin Description
-
1
3 N.C.*
+
+
LM4040
SC70-3/SOT23-3
TOP VIEW
2
*PIN 3 MUST BE LEFT UNCONNECTED
OR CONNECTED TO PIN 2.
Pin Conguration
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.
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.
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.
Figure 3. Typical Operating Circuit
LM4040
ILOAD
ISHUNT
RS
VS
VR
ISHUNT + ILOAD
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
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+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PART OUTPUT
VOLTAGE (V)
INITIAL
ACCURACY
(%)
TEMPCO
(ppm/°C) TEMP RANGE PIN-PACKAGE TOP
MARK
LM4040AIM3-2.1+T 2.048 0.1 100 -40°C to +85°C 3 SOT23 FZEF
LM4040AIX3-2.1+T 2.048 0.1 100 -40°C to +85°C 3 SC70 ABJ
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
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
www.maximintegrated.com Maxim Integrated
│
13
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
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
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
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
www.maximintegrated.com Maxim Integrated
│
14
Ordering Information (continued)
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PART OUTPUT
VOLTAGE (V)
INITIAL
ACCURACY
(%)
TEMPCO
(ppm/°C) TEMP RANGE PIN-PACKAGE TOP
MARK
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
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
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
3 SOT23 U3+1 21-0051 90-0179
3 SC70 X3+2 21-0075 90-0208
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
www.maximintegrated.com Maxim Integrated
│
15
Ordering Information (continued)
Package Information
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.
Chip Information
PROCESS: BiCMOS
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 8/00 Initial release —
5 7/05 Updated Electrical Characteristics. 2–7
6 4/11 Updated Selector Guide, Absolute Maximum Ratings, and Ordering
Information. 1, 2, 12, 13, 14
711/11 Add /V+ automotive-qualied identication to the Selector Guide and
Ordering Information.1, 12
8 3/13 Updated Ordering Information and removed Selector Guide. 1, 13, 14
9 1/16 Added /V part to Ordering Information table 13
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 specications 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. © 2016 Maxim Integrated Products, Inc.
│
16
LM4040 Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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LM4040AIM3-2.5+T LM4040AIM3-3.0+T LM4040AIM3-4.1+T LM4040AIM3-5.0+T LM4040BEM3-4.1+T
LM4040BIM3-2.1+T LM4040BIM3-2.5+T LM4040BIM3-5.0+T LM4040BIX3-2.5+T LM4040BIX3-3.0+T
LM4040CEM3-5.0+T LM4040CIM3-2.5+T LM4040CIX3-5.0+T LM4040DEM3-5.0+T LM4040DIM3-2.5+T
LM4040DIM3-5.0+T LM4040DIX3-2.5+T LM4040AEM3-2.1+T LM4040AEM3-2.5+T LM4040AEM3-3.0+T
LM4040AEM3-4.1+T LM4040AEM3-5.0+T LM4040AEX3-2.1+T LM4040AEX3-2.5+T LM4040AEX3-3.0+T
LM4040AEX3-3.3+T LM4040AEX3-4.1+T LM4040AEX3-5.0+T LM4040AIM3-2.1+T LM4040AIX3-2.1+T
LM4040AIX3-3.0+T LM4040AIX3-4.1+T LM4040AIX3-5.0+T LM4040BEM3-2.1+T LM4040BEM3-2.5+T
LM4040BEM3-3.0+T LM4040BEM3-5.0+T LM4040BEX3-3.3+T LM4040BIM3-3.0+T LM4040BIM3-4.1+T
LM4040BIX3-2.1+T LM4040BIX3-4.1+T LM4040BIX3-5.0+T LM4040CEM3-2.1+T LM4040CEM3-2.5+T
LM4040CEM3-3.0+T LM4040CEX3-3.3+T LM4040CIM3-2.1+T LM4040CIM3-3.0+T LM4040CIM3-4.1+T
LM4040CIM3-5.0+T LM4040CIX3-2.1+T LM4040CIX3-2.5+T LM4040CIX3-3.0+T LM4040CIX3-4.1+T LM4040DEM3-
2.1+T LM4040DEM3-2.5+T LM4040DEM3-3.0+T LM4040DEM3-4.1+T LM4040DEX3-2.1+T LM4040DEX3-2.5+T
LM4040DEX3-3.0+T LM4040DEX3-3.3+T LM4040DEX3-4.1+T LM4040DEX3-5.0+T LM4040DIM3-2.1+T
LM4040DIM3-3.0+T LM4040DIM3-4.1+T LM4040DIX3-2.1+T LM4040DIX3-3.0+T LM4040DIX3-4.1+T LM4040DIX3-
5.0+T LM4040CEM3-4.1+T LM4040BEX3-4.1+T LM4040CEX3-5.0+T LM4040AIX3-2.5+T LM4040BEX3-2.5+T
LM4040BEX3-5.0+T LM4040CEM3-5.0/V+T LM4040CEX3-2.5+T