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 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 1.8mm), 50%
smaller than comparable devices in SOT23 surfacemount 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.
Features
o Ultra-Small 3-Pin SC70 Package
o 0.1% (max) Initial Accuracy
o 100ppm/°C (max) Temperature Coefficient
Guaranteed over -40°C to +125°C Temperature
Range
o Wide Operating Current Range: 60µA to 15mA
o Low 28µVRMS 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
Pin Configuration
TOP VIEW
+
+
1
LM4040
________________________Applications
Portable, Battery-Powered Equipment
Notebook Computers
3
N.C.*
- 2
SC70-3/SOT23-3
Cell Phones
Industrial Process Controls
*PIN 3 MUST BE LEFT UNCONNECTED
OR CONNECTED TO PIN 2.
Ordering Information appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-1787; Rev 8; 3/13
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 2.17mW/°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
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
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance (Note 2)
Minimum Operating Current
SYMBOL
VR
VR
IRMIN
CONDITIONS
MIN
TYP
MAX
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
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
TA = +25°C
∆VR/∆T
IR = 1mA
LM4040A/B/C
±15
±100
LM4040D
±15
±150
IRMIN ≤ IR ≤ 1mA
Reverse Dynamic
Impedance (Note 3)
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
2
1mA ≤ IR ≤ 15mA
ZR
eN
∆VR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
mV
µA
ppm/°C
±15
IR = 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
V
±20
IR = 10mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
UNITS
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
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
SYMBOL
VR
VR
IRMIN
CONDITIONS
MIN
TYP
MAX
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
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
TA = +25°C
∆VR/∆T
IR = 1mA
LM4040A/B/C
±15
±100
LM4040D
±15
±150
IRMIN ≤ IR ≤ 1mA
Reverse Dynamic
Impedance (Note 3)
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
Maxim Integrated
1mA ≤ IR ≤ 15mA
ZR
eN
∆VR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
mV
µA
ppm/°C
±15
IR = 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
V
±20
IR = 10mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
UNITS
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
3
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
SYMBOL
VR
VR
IRMIN
CONDITIONS
TA = +25°C
MIN
TYP
MAX
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
LM4040D (1.0%)
2.970
3.000
3.030
LM4040A
±3.0
±22
LM4040B
±6.0
±26
LM4040C
±15
±34
LM4040D
±30
±59
LM4040A/B/C
45
67
LM4040D
45
70
∆VR/∆T
IR = 1mA
LM4040A/B/C
±15
±100
LM4040D
±15
±150
IRMIN ≤ IR ≤ 1mA
Reverse Dynamic
Impedance (Note 3)
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
4
1mA ≤ IR ≤ 15mA
ZR
eN
∆VR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
mV
µA
ppm/°C
±15
IR = 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
V
±20
IR = 10mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
UNITS
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
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
SYMBOL
CONDITIONS
LM4040A (0.1%)
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance (Note 2)
Minimum Operating Current
VR
VR
IRMIN
∆VR/∆T
Reverse Dynamic
Impedance (Note 3)
3.2934
3.3000
3.3066
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
LM4040D
±30
±59
LM4040A/B/C
45
67
LM4040D
45
70
IR = 1mA
IRMIN ≤ IR ≤ 1mA
Wideband Noise
Reverse Breakdown Voltage
Long-Term Stability
Maxim Integrated
1mA ≤ IR ≤ 15mA
ZR
eN
∆VR
MAX
3.3033
LM4040C (0.5%)
IR = 1mA, f = 120Hz,
IAC = 0.1IR
UNITS
V
mV
µA
±20
LM4040A/B/C
±15
±100
LM4040D
±15
±150
ppm/°C
±15
IR = 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
TYP
3.3000
LM4040B (0.2%)
TA = +25°C
IR = 10mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
MIN
3.2967
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
5
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
SYMBOL
VR
VR
IRMIN
CONDITIONS
TA = +25°C
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
∆VR/∆T
IR = 1mA
LM4040A/B/C
±20
±100
LM4040D
±20
±150
IRMIN ≤ IR ≤ 1mA
µA
ppm/°C
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
6
1mA ≤ IR ≤ 15mA
mV
±15
IR = 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
V
±30
IR = 10mA
Average Reverse Voltage
Temperature Coefficient
(Notes 2 and 3)
UNITS
∆VR
Ω
Maxim Integrated
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
IRMIN ≤ IR ≤ 1mA
1mA ≤ IR ≤ 15mA
V
mV
µA
ppm/°C
±15
IR = 100µA
Reverse Breakdown Voltage
Change with Operating
Current Change
UNITS
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 65°C
B grade: ±0.85% = ±0.2% ±100ppm/°C 65°C
C grade: ±1.15% = ±0.5% ±100ppm/°C 65°C
D grade: ±1.98% = ±1.0% ±150ppm/°C 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 100°C
B grade: ±1.2% = ±0.2% ±100ppm/°C 100°C
C grade: ±1.5% = ±0.5% ±100ppm/°C 100°C
D grade: ±2.5% = ±1.0% ±150ppm/°C 100°C
Therefore, as an example, the A-grade LM4040-2.5 has an over-temperature reverse breakdown voltage tolerance of ±2.5V
0.75% = ±19mV.
Note 3: Guaranteed by design.
Maxim Integrated
7
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.)
REVERSE CHARACTERISTICS AND
MINIMUM OPERATING CURRENT
LM4040_I_3-3.0
3
2
LM4040_I_3-2.5
LM4040_I_3-2.1
0
0
REFERENCE VOLTAGE CHANGE (mV)
-1
-2
-3
-4
-5
0
50
100
-5
-10
-15
-20
-50
-25
0
REVERSE CURRENT (µA)
25
50
75
125
100
-50
-25
0
TEMPERATURE (°C)
LM4040-2.5V
REVERSE VOLTAGE vs. ISHUNT
TA = -40°C
3
TA = +25°C
TA = +85°C
2
1
6
REVERSE VOLTAGE CHANGE (mV)
LM4040-04
TA = +125°C
4
25
50
75
100
125
TEMPERATURE (°C)
LM4040-5.0V
REVERSE VOLTAGE vs. ISHUNT
5
REVERSE VOLTAGE CHANGE (mV)
0
LM4040 toc05
REVERSE VOLTAGE (V)
4
5
LM4040 toc03
1
5
1
LM4040-5.0V
TEMPERATURE DRIFT
LM4040-02
LM4040_I_3-5.0
REFERENCE VOLTAGE CHANGE (mV)
LM4040_I_3-4.1
LM4040-01
6
LM4040-2.5V
TEMPERATURE DRIFT
TA = -40°C
5
4
TA = +125°C
3
TA = +85°C
2
1
TA = +25°C
0
0
0
5
10
ISHUNT (mA)
8
15
20
0
5
10
15
20
ISHUNT (mA)
Maxim Integrated
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Typical Operating Characteristics (continued)
(IR = 100µA, SC70 package, TA = +25°C, unless otherwise noted.)
LM4040-2.5V
LOAD-TRANSIENT RESPONSE
LM4040-5.0V
LOAD-TRANSIENT RESPONSE
LM4040-2.5V
LOAD-TRANSIENT RESPONSE
LM4040-08
LM4040-07
LM4040-06
VGEN
VGEN
VGEN
10mV/div
VR AC-COUPLED
2mV/div
VR AC-COUPLED
VR AC-COUPLED
-250µA
-25µA
-25µA
ISHUNT = 100µA ± 25µA
RL = 100kΩ, SEE FIGURE 1
LM4040-5.0V
LOAD-TRANSIENT RESPONSE
10mV/div
10µs/div
40µs/div
10µs/div
CH1: VGEN 2V/div
CH2: VR AC-COUPLED 2mV/div
ISHUNT = 100µA ± 25µA, RL = 100kΩ, SEE FIGURE 1
ISHUNT = 1mA ± 250µA
RL = 10kΩ, SEE FIGURE 1
LM4040-5.0V
LOAD-TRANSIENT RESPONSE
LM4040-2.5V
LOAD-TRANSIENT RESPONSE
LM4040-09
LM4040-11
LM4040-10
+2.5mA
VGEN
+2.5mA
VGEN
VGEN
+250µA
-250µA
-2.5mA
10mV/div
20mV/div
10µs/div
20mV/div
10µs/div
10µs/div
ISHUNT = 1mA ± 250µA
RL = 10kΩ, SEE FIGURE 1
VR AC-COUPLED
-2.5mA
VR AC-COUPLED
VR AC-COUPLED
+250µA
+25µA
+25µA
ISHUNT = 10mA ± 2.5mA
RL = 1kΩ, SEE FIGURE 1
ISHUNT = 10mA ± 2.5mA
RL = 1kΩ, SEE FIGURE 1
ISHUNT
VB
1kΩ
+
-
RL
VR
VGEN
Figure 1. Load-Transient Test Circuit
Maxim Integrated
9
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Typical Operating Characteristics (continued)
(IR = 100µA, SC70 package, TA = +25°C, unless otherwise noted.)
LM4040-2.5V
STARTUP CHARACTERISTICS
LM4040-5.0V
STARTUP CHARACTERISTICS
LM4040-2.5V
OUTPUT IMPEDANCE vs. FREQUENCY
LM4040-13
5V
1000
LM4040-14
LM4040-12
C1 = 1µF
0V
2V
4V
1V
0V
100
IMPEDANCE (Ω)
0V
VOUT
2V
0V
4
8
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)
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
NOISE (nV/√Hz)
IR = 150µA
IR = 1mA
1
10,000
10,000
NOISE (nV/√Hz)
C1 = 0
LM4040-16
LM4040-15
100
IMPEDANCE (Ω)
C1 = 0
1
RS = 30kΩ
SEE FIGURE 2
0
IR = 150µA
10
1000
1M
LM4040-17
VOUT
VIN
VIN
5V
1000
C1 = 1µF
0.1
100
0.1k
1k
10k
100k
1M
1
FREQUENCY (Hz)
10
100
1k
10k
FREQUENCY (Hz)
100
1
10
100
1k
10k
FREQUENCY (Hz)
RS
VIN
1Hz RATE
50%
DUTY CYCLE
VR
Figure 2. Startup Characteristics Test Circuit
10
Maxim Integrated
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Pin Description
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.
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 LM4040’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 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 (VS(MAX) - VSHUNT)
VS
ISHUNT + ILOAD
RS
ILOAD
VR
ISHUNT
LM4040
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 thus 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.
Output Capacitance
The LM4040 does not require an external capacitor for frequency stability and is stable for any output capacitance.
Maxim Integrated
11
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Ordering Information
LM4040AIM3-2.1+T
2.048
INITIAL
ACCURACY
(%)
0.1
LM4040AIX3-2.1+T
2.048
LM4040BIM3-2.1+T
2.048
LM4040BIX3-2.1+T
2.048
PART
OUTPUT
VOLTAGE (V)
TEMPCO
(ppm/°C)
TEMP RANGE
PIN-PACKAGE
TOP
MARK
100
-40°C to +85°C
3 SOT23
FZEF
0.1
100
-40°C to +85°C
3 SC70
0.2
100
-40°C to +85°C
3 SOT23
FZEG
0.2
100
-40°C to +85°C
3 SC70
ABK
FZEH
ABJ
LM4040CIM3-2.1+T
2.048
0.5
100
-40°C to +85°C
3 SOT23
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
LM4040BEX3-2.1-T
2.048
0.2
100
-40°C to +125°C
3 SC70
FZNH
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
LM4040BIM3-2.5/V+T
2.500
0.2
100
-40°C to +125°C
3 SOT23
FZWL
LM4040BIX3-2.5+T
2.500
0.2
100
-40°C to +85°C
3 SC70
ABO
FZEL
LM4040CIM3-2.5+T
2.500
0.5
100
-40°C to +85°C
3 SOT23
LM4040CIX3-2.5+T
2.500
0.5
100
-40°C to +85°C
3 SC70
LM4040DIM3-2.5+T
2.500
1.0
150
-40°C to +85°C
3 SOT23
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
ABP
FZEM
ALJ
LM4040BEM3-2.5+T
2.500
0.2
100
-40°C to +125°C
3 SOT23
LM4040BEX3-2.5+T
2.500
0.2
100
-40°C to +125°C
3 SC70
FZNL
LM4040CEM3-2.5+T
2.500
0.5
100
-40°C to +125°C
3 SOT23
FZNM
FZVZ
ALK
LM4040CEM3-2.5/V+T
2.500
0.5
100
-40°C to +125°C
3 SOT23
LM4040CEX3-2.5+T
2.500
0.5
100
-40°C to +125°C
3 SC70
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
ALL
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
12
Maxim Integrated
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
FZEN
LM4040AIM3-3.0+T
3.000
0.1
100
-40°C to +85°C
3 SOT23
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
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
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
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
ABT
ALP
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
FZER
LM4040AIM3-4.1+T
4.096
0.1
100
-40°C to +85°C
3 SOT23
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
FZEU
LM4040DIM3-4.1+T
4.096
1.0
150
-40°C to +85°C
3 SOT23
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
LM4040CEM3-4.1+T
4.096
0.5
100
-40°C to +125°C
3 SOT23
ALS
FZNU
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Maxim Integrated
13
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Ordering Information (continued)
OUTPUT
VOLTAGE (V)
INITIAL
ACCURACY
(%)
TEMPCO
(ppm/°C)
TEMP RANGE
LM4040CEX3-4.1+T
4.096
0.5
100
-40°C to +125°C
3 SC70
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
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
FZEX
PART
PIN-PACKAGE
TOP
MARK
ALT
ABZ
LM4040CIM3-5.0+T
5.000
0.5
100
-40°C to +85°C
3 SOT23
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
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
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
LM4040DEM3-5.0+T
5.000
1.0
150
-40°C to +125°C
3 SOT23
LM4040DEX3-5.0+T
5.000
1.0
150
-40°C to +125°C
3 SC70
ACC
ALV
ALX
FZNZ
ALY
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Package Information
Chip Information
PROCESS: BiCMOS
14
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
TYPE
PACKAGE
CODE
OUTLINE NO.
LAND
PATTERN NO.
3 SOT23
U3+1
21-0051
90-0179
3 SC70
X3+2
21-0075
90-0208
Maxim Integrated
LM4040
Improved Precision Micropower Shunt Voltage
Reference with Multiple Reverse Breakdown Voltages
Revision History
REVISION
NUMBER
REVISION
DATE
0
8/00
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
Initial release
PAGES
CHANGED
—
2–7
1, 13, 14
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 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 ________________________________ 15
© 2013 Maxim Integrated Products, Inc.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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