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LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
General Description
The LM4050/LM4051 are precision two-terminal, shuntmode, bandgap voltage references available in fixed
reverse breakdown voltages of 1.225V, 2.048V, 2.500V,
3.000V, 3.3V, 4.096V, and 5.000V. Ideal for space-critical
applications, the LM4050/LM4051 are offered in the sub
miniature 3-pin SC70 surface-mount packages (1.8mm
x 1.8mm), 50% smaller than comparable devices in
SOT23 surface-mount package (SOT23 versions are also
available).
Laser-trimmed resistors ensure excellent initial accuracy.
With a 50ppm/°C temperature coefficient, these devices
are offered in three grades of initial accuracy ranging from
0.1% to 0.5%. The LM4050/LM4051 have 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
LM4050/LM4051 do not require an external stabilizing
capacitor while ensuring stability with any capacitive loads.
The LM4050/LM4051 specifications are guaranteed over
the temperature range of -40°C to +125°C.
●● Ultra-Small 3-Pin SC70 Package
●● 0.1% (max) Initial Accuracy
●● Wide Operating Current Range: 60µA to 15mA
●● Low 28µVRMS Output Noise (10Hz to 10kHz)
●● 1.225V, 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
for the Specific /V Versions
Pin Configuration
TOP VIEW
+ 1
Applications
●●
●●
●●
●●
●●
Features
●● 50ppm/°C (max) Temperature Coefficient Guaranteed
over the -40°C to +125°C Temperature Range
Portable, Battery-Powered Equipment
Notebook Computers
Cell Phones
Industrial Process Controls
Automotive
+
LM4050
LM4051
3
N.C.*
- 2
SC70/SOT23
*PIN 3 MUST BE LEFT UNCONNECTED OR CONNECTED TO PIN 2.
Pin Configuration
Ordering Information appears at end of data sheet.
VS
ISHUNT + ILOAD
RS
ILOAD
ISHUNT
LM4050
19-2563; Rev 15; 7/20
VR
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References 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 2.9mW/°C above +70°C)...........235.3mW
3-Pin SOT23 (derate 3mW/°C above +70°C)...........238.1mW
Operating Temperature Range
LM4050/LM4051_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, 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, 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
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Electrical Characteristics —1.225V
(IR = 100µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
Reverse Breakdown Voltage
SYMBOL
VR
Reverse Breakdown Voltage
Tolerance (Note 3)
VRTOL
Minimum Operating Current
IRMIN
Average Reverse Voltage
Temperature Coefficient
(Notes 3, 4)
DVR/DT
Reverse Breakdown Voltage
Change with Operating
Current Change
CONDITIONS
TA = +25°C
MIN
TYP
MAX
LM4051A (0.1%)
1.2238
1.2250
1.2262
LM4051B (0.2%)
1.2226
1.2250
1.2275
LM4051C (0.5%)
1.2189
UNITS
V
1.2250
1.2311
LM4051A
±1.2
±7
LM4051B
±2.4
±9
LM4051C
±6.0
±12
45
60
µA
±50
ppm/°C
IR = 10mA
±20
IR = 1mA
±15
IR = 100µA
±15
IRMIN ≤ IR ≤ 1mA
0.7
1.5
1mA ≤ IR ≤ 12mA
2.5
8.0
1.5
mV
mV
Reverse Dynamic
Impedance (Note 4)
ZR
IR = 1mA, f = 120Hz, IAC = 0.1IR
0.5
Wideband Noise
eN
IR = 100µA, 10Hz ≤ f ≤ 10kHz
20
µVRMS
T = 1000h
120
ppm
Reverse Breakdown Voltage
Long-Term Stability
∆VR
Ω
Electrical Characteristics —2.048V
(IR = 100µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
Reverse Breakdown Voltage
SYMBOL
VR
Reverse Breakdown Voltage
Tolerance (Note 3)
VRTOL
Minimum Operating Current
IRMIN
Average Reverse Voltage
Temperature Coefficient
(Notes 3, 4)
DVR/DT
Reverse Breakdown Voltage
Change with Operating
Current Change
CONDITIONS
TA = +25°C
MIN
TYP
MAX
LM4050A (0.1%)
2.0460
2.0480
2.0500
LM4050B (0.2%)
2.0439
2.0480
2.0521
LM4050C (0.5%)
2.0378
UNITS
V
2.0480
2.0582
LM4050A
±2.0
±12
LM4050B
±4.0
±14
LM4050C
±10
±20
45
65
µA
±50
ppm/°C
IR = 10mA
±20
IR = 1mA
±15
IR = 100µA
±15
IRMIN ≤ IR ≤ 1mA
0.3
1.0
1mA ≤ IR ≤ 15mA
2.5
8.0
LM4050A/B
0.3
0.8
LM4050C
0.3
0.9
mV
mV
Reverse Dynamic
Impedance (Note 4)
ZR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
Wideband Noise
eN
IR = 100µA, 10Hz ≤ f ≤ 10kHz
28
µVRMS
T = 1000h
120
ppm
Reverse Breakdown Voltage
Long-Term Stability
www.maximintegrated.com
DVR
Ω
Maxim Integrated │ 3
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References 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 2)
PARAMETER
Reverse Breakdown Voltage
SYMBOL
VR
Reverse Breakdown Voltage
Tolerance (Note 3)
VRTOL
Minimum Operating Current
IRMIN
Average Reverse Voltage
Temperature Coefficient
(Notes 3, 4)
DVR/DT
Reverse Breakdown Voltage
Change with Operating
Current Change
CONDITIONS
TA = +25°C
MIN
TYP
MAX
LM4050A (0.1%)
2.4975
2.5000
2.5025
LM4050B (0.2%)
2.4950
2.5000
2.5050
LM4050C (0.5%)
2.4875
UNITS
V
2.5000
2.5125
LM4050A
±2.5
±15
LM4050B
±5.0
±18
LM4050C
±13
±25
45
65
µA
±50
ppm/°C
IR = 10mA
±20
IR = 1mA
±15
IR = 100µA
±15
IRMIN ≤ IR ≤ 1mA
0.3
1.0
1mA ≤ IR ≤ 15mA
2.5
8.0
LM4050A/B
0.3
0.8
LM4050C
0.3
0.9
mV
mV
Reverse Dynamic
Impedance (Note 4)
ZR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
Wideband Noise
eN
IR = 100µA, 10Hz ≤ f ≤ 10kHz
35
µVRMS
T = 1000h
120
ppm
Reverse Breakdown Voltage
Long-Term Stability
www.maximintegrated.com
DVR
Ω
Maxim Integrated │ 4
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References 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 2)
PARAMETER
Reverse Breakdown Voltage
SYMBOL
VR
Reverse Breakdown Voltage
Tolerance (Note 3)
VRTOL
Minimum Operating Current
IRMIN
Average Reverse Voltage
Temperature Coefficient
(Notes 3, 4)
DVR/DT
Reverse Breakdown Voltage
Change with Operating
Current Change
CONDITIONS
TA = +25°C
MIN
TYP
MAX
LM4050A (0.1%)
2.9970
3.0000
3.0030
LM4050B (0.2%)
2.9940
3.0000
3.0060
LM4050C (0.5%)
2.9850
UNITS
V
3.0000
3.0150
LM4050A
±3.0
±18
LM4050B
±6.0
±21
LM4050C
±15
±30
45
67
µA
±50
ppm/°C
IR = 10Ma
±20
IR = 1mA
±15
IR = 100µA
±15
IRMIN ≤ IR ≤ 1mA
0.3
1.0
1mA ≤ IR ≤ 15mA
2.5
8.0
LM4050A/B
0.3
0.8
LM4050C
0.3
0.9
mV
mV
Reverse Dynamic
Impedance (Note 4)
ZR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
Wideband Noise
eN
IR = 100µA, 10Hz ≤ f ≤ 10kHz
45
µVRMS
T = 1000h
120
ppm
Reverse Breakdown Voltage
Long-Term Stability
DVR
Ω
Electrical Characteristics—3.300V
(IR = 100µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
Reverse Breakdown Voltage
SYMBOL
VR
Reverse Breakdown Voltage
Tolerance (Note 3)
VRTOL
Minimum Operating Current
IRMIN
Average Reverse Voltage
Temperature Coefficient
(Notes 3, 4)
DVR/DT
Reverse Breakdown Voltage
Change with Operating
Current Change
CONDITIONS
TA = +25°C
MIN
TYP
MAX
LM4050A (0.1%)
3.2967
3.3000
3.3033
LM4050B (0.2%)
3.2934
3.3000
3.3066
LM4050C (0.5%)
3.2835
3.3000
3.3165
UNITS
V
LM4050A
±3.0
±18
LM4050B
±6.0
±21
LM4050C
±15
±30
45
67
µA
±50
ppm/°C
IR = 10mA
±20
IR = 1mA
±15
IR = 100µA
±15
IRMIN ≤ IR ≤ 1mA
0.3
1.0
1mA ≤ IR ≤ 15mA
2.5
8.0
LM4050A/B
0.3
0.8
LM4050C
0.3
0.9
mV
mV
Reverse Dynamic
Impedance (Note 4)
ZR
IR = 1mA, f = 120Hz,
IAC = 0.1IR
Wideband Noise
eN
IR = 100µA, 10Hz ≤ f ≤ 10kHz
50
µVRMS
T = 1000h
120
ppm
Reverse Breakdown Voltage
Long-Term Stability
www.maximintegrated.com
DVR
Ω
Maxim Integrated │ 5
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References 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 2)
PARAMETER
Reverse Breakdown Voltage
SYMBOL
VR
Reverse Breakdown Voltage
Tolerance (Note 3)
VRTOL
Minimum Operating Current
IRMIN
Average Reverse Voltage
Temperature Coefficient
(Notes 3, 4)
DVR/DT
Reverse Breakdown Voltage
Change with Operating
Current Change
CONDITIONS
TA = +25°C
MIN
TYP
MAX
LM4050A (0.1%)
4.0919
4.0960
4.1001
LM4050B (0.2%)
4.0878
4.0960
4.1042
LM4050C (0.5%)
4.0755
UNITS
V
4.0960
4.1165
LM4050A
±4.1
±25
LM4050B
±8.2
±29
LM4050C
±20
±41
50
73
µA
±50
ppm/°C
IR = 10mA
±30
IR = 1mA
±20
IR = 100µA
±15
IRMIN ≤ IR ≤ 1mA
0.5
1.2
1mA ≤ IR ≤ 15mA
3.0
10.0
1.0
mV
mV
Reverse Dynamic
Impedance (Note 4)
ZR
IR = 1mA, f = 120Hz, IAC = 0.1IR
0.5
Wideband Noise
eN
IR = 100µA, 10Hz ≤ f ≤ 10kHz
64
µVRMS
T = 1000h
120
ppm
Reverse Breakdown Voltage
Long-Term Stability
www.maximintegrated.com
DVR
Ω
Maxim Integrated │ 6
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References 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 2)
PARAMETER
Reverse Breakdown Voltage
SYMBOL
VR
MIN
TYP
MAX
LM4050A (0.1%)
4.9950
5.0000
5.0050
LM4050B (0.2%)
4.9900
5.0000
5.0100
LM4050C (0.5%)
4.9750
5.0000
5.0250
±5.0
±30
LM4050B
±10
±35
LM4050C
±25
±50
54
80
µA
±50
ppm/°C
TA = +25°C
LM4050A
Reverse Breakdown Voltage
Tolerance (Note 3)
VRTOL
Minimum Operating Current
IRMIN
Average Reverse Voltage
Temperature Coefficient
(Notes 3, 4)
CONDITIONS
DVR/DT
Reverse Breakdown Voltage
Change with Operating
Current Change
IR = 10mA
±30
IR = 1mA
±20
IR = 100µA
±15
IRMIN ≤ IR ≤ 1mA
0.5
1.4
1mA ≤ IR ≤ 15mA
3.5
12.0
1.1
UNITS
V
mV
mV
Reverse Dynamic
Impedance (Note 4)
ZR
IR = 1mA, f = 120Hz, IAC = 0.1IR
0.5
Wideband Noise
eN
IR = 100µA, 10Hz ≤ f ≤ 10kHz
80
µVRMS
T = 1000h
120
ppm
Reverse Breakdown Voltage
Long-Term Stability
DVR
Ω
Note 2: All devices are 100% production tested at +25°C and are guaranteed by design for TA = TMIN to TMAX, as specified.
Note 3: The limit over the full temperature range for the reverse breakdown voltage tolerance is defined as:
[VRTOL] ±[(∆VR / ∆T) X (max∆T) X (VR)]
where ∆VR / ∆T is the VR temperature coefficient, max∆T is the difference from the +25°C reference point to TMIN or TMAX,
and VR is the reverse breakdown voltage.
The total tolerance over the full temperature range for the different grades where max∆T = +100°C is shown below:
• A grade: ±0.6% = ±0.1% ±50ppm/°C x 100°C
• B grade: ±0.7% = ±0.2% ±50ppm/°C x 100°C
• C grade: ±1.0% = ±0.5% ±50ppm/°C x 100°C
Note 4: Guaranteed by design.
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Maxim Integrated │ 7
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Typical Operating Characteristics
(IR = 100µA, SC70-3 package, TA = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE (V)
LM4050_I_3-3.0
3
2
LM4050_I_3-2.5
0
2.494
2.492
LM4050_I_3-2.1
0
2.490
100
-40
LM4050 toc04
REVERSE VOLTAGE CHANGE (mV)
-15
10
35
60
85
110
TA = +125°C
4
TA = -40°C
3
TA = +25°C
TA = +85°C
2
1
5
10
ISHUNT (mA)
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4.997
4.995
4.993
4.991
135
4.987
-40
-15
10
15
20
35
60
85
110
135
TEMPERATURE (°C)
LM4050-2.5V
REVERSE VOLTAGE vs. ISHUNT
0
4.999
TEMPERATURE (°C)
REVERSE CURRENT (µA)
0
5.001
4.989
50
5
5.003
LM4050-5.0V
REVERSE VOLTAGE vs. ISHUNT
6
LM4050 toc05
1
2.496
REVERSE VOLTAGE CHANGE (mV)
REVERSE VOLTAGE (V)
5
4
2.498
MAX4050 toc02
LM4050_I_3-5.0
OUTPUT VOLTAGE vs. TEMPERATURE
(VOUT = 5.000V)
OUTPUT VOLTAGE (V)
LM4050_I_3-4.1
LM4050 toc01
6
OUTPUT VOLTAGE vs. TEMPERATURE
(VOUT = 2.500V)
MAX4050 toc03
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 │ 8
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Typical Operating Characteristics (continued)
(IR = 100µA, SC70-3 package, TA = +25°C, unless otherwise noted.)
LM4050-2.5V
LOAD-TRANSIENT RESPONSE
LM4050-5.0V
LOAD-TRANSIENT RESPONSE
LM4050 toc06
LM4050-2.5V
LOAD-TRANSIENT RESPONSE
LM4050 toc07
LM4050 toc08
+25µA
-25µA
10mV/div
10µs/div
40µs/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.
LM4050-2.5V
LOAD-TRANSIENT RESPONSE
LM4050-5.0V
LOAD-TRANSIENT RESPONSE
LM4050 toc10
LM4050 toc09
LM4050 toc11
+2.5mA
VGEN
+2.5mA
-2.5mA
VR AC-COUPLED
-250µA
20mV/div
10µs/div
10µs/div
ISHUNT = 1mA ±250µA
RL = 10kΩ, SEE FIGURE 1.
-2.5mA
VR AC-COUPLED
VGEN
VGEN
+250µA
10mV/div
10mV/div
10µs/div
ISHUNT = 100µA ±25µA
RL = 100kΩ, SEE FIGURE 1.
LM4050-5.0V
LOAD-TRANSIENT RESPONSE
VR AC-COUPLED
-250µA
VR AC-COUPLED
VR AC-COUPLED
VR AC-COUPLED
-25µA
2mV/div
+250µA
VGEN
VGEN
VGEN
+25µA
20mV/div
10µs/div
ISHUNT = 10mA ±2.5mA
RL = 1kΩ, SEE FIGURE 1.
ISHUNT = 10mA ±2.5µA
RL = 1kΩ, SEE FIGURE 1.
ISHUNT
VB
+
-
1kΩ
VR
RL
VGEN
Figure 1. Load-Transient Test Circuit
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Maxim Integrated │ 9
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Typical Operating Characteristics (continued)
(IR = 100µA, SC70-3 package, TA = +25°C, unless otherwise noted.)
LM4050-5.0V
STARTUP CHARACTERISTICS
LM4050 toc13
0
0
1V
0
C1 = 1µF
100
4V
VOUT
VOUT
2V
1000
LM4050-2.5V
OUTPUT IMPEDANCE vs. FREQUENCY
5V
IMPEDANCE (Ω)
5V
VIN
VIN
LM4050 toc12
2V
0
LM4050 toc14
LM4050-2.5V
STARTUP CHARACTERISTICS
IR = 150µA
10
C1 = 0
1
IR = 1mA
8
12 16 20 24 28 32 36
0
RESPONSE TIME (µs)
SEE FIGURE 2.
RESPONSE TIME (µs)
SEE FIGURE 2.
LM4050 toc15
LM4050-5.0V
OUTPUT IMPEDANCE vs. FREQUENCY
C1 = 0
10
IR = 150µA
IR = 1mA
1
0.1k
1k
10k
100k
1M
FREQUENCY (Hz)
LM4050-2.5V
NOISE vs. FREQUENCY
10,000
NOISE (nV/√Hz)
IMPEDANCE (Ω)
100
0.1
10 20 30 40 50 60 70 80 90
1000
LM4050-5.0V
NOISE vs. FREQUENCY
10,000
NOISE (nV/√Hz)
4
LM4050 toc16
0
RS = 16kΩ
LM4050 toc17
RS = 30kΩ
1000
C1 = 1µF
0.1
0.1k
1k
10k
100k
1M
100
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
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Maxim Integrated │ 10
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
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.
Detailed Description
The LM4050/LM4051 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 LM4050/
LM4051 clamps to a voltage of one diode drop below
ground when biased with forward currents up 10mA.
Figure 3 shows a typical operating circuit. The LM4050/
LM4051 are ideal for providing stable references from a
high-voltage power supply.
VS
ISHUNT + ILOAD
RS
ILOAD
VR
ISHUNT
LM4050
Applications Information
The LM4050/LM4051s’ internal pass transistors are 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 LM4050/LM4051 do not require external capacitors for frequency stability and are stable for any output
capacitance.
www.maximintegrated.com
Figure 3. Typical Operating Circuit
Temperature Performance
The LM4050/LM4051 typically exhibit output voltage temperature coefficients within ±15ppm/°C. The polarity of the
temperature coefficients 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 LM4050/
LM4051 is +150°C. The maximum operating temperature
for the LM4050/LM4051_E_ is +125°C. At a maximum
load current of 15mA and a maximum output voltage of
5V, the parts 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 parts self-heat to 35.56°C above ambient
temperature. If the ambient temperature is +125°C, the
parts operate at 159.56°C, thereby exceeding the maximum junction temperature value of +150°C. For hightemperature 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 │ 11
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Ordering Information
PART
OUTPUT
INITIAL
VOLTAGE (V) ACCURACY (%)
TEMPCO
(ppm/_C)
TEMP RANGE
PIN-PACKAGE
TOP
MARK
LM4050AEM3-2.1+T
2.048
0.1
50
-40°C to +125°C
3 SOT23
FZTR
LM4050AEM3-2.1/V+T
2.048
0.1
50
-40°C to +125°C
3 SOT23
+FZXW
LM4050AEX3-2.1+T
2.048
0.1
50
-40°C to +125°C
3 SC70
ASM
LM4050BEM3-2.1+T
2.048
0.2
50
-40°C to +125°C
3 SOT23
FZTS
LM4050BEX3-2.1+T
2.048
0.2
50
-40°C to +125°C
3 SC70
ASN
LM4050CEM3-2.1+T
2.048
0.5
50
-40°C to +125°C
3 SOT23
FZTT
LM4050CEX3-2.1+T
2.048
0.5
50
-40°C to +125°C
3 SC70
ASO
LM4050AEM3-2.5+T
2.500
0.1
50
-40°C to +125°C
3 SOT23
FZTU
LM4050AEM3-2.5/V+T*
2.500
0.1
50
-40°C to +125°C
3 SOT23
---
LM4050AEX3-2.5+T
2.500
0.1
50
-40°C to +125°C
3 SC70
ASP
LM4050AEX3-2.5/V+T
2.500
0.1
50
-40°C to +125°C
3 SC70
+AUE
LM4050BEM3-2.5+T
2.500
0.2
50
-40°C to +125°C
3 SOT23
FZTV
LM4050BEM3-2.5/V+T
2.500
0.2
50
-40°C to +125°C
3 SOT23
FZXS
LM4050BEX3-2.5+T
2.500
0.2
50
-40°C to +125°C
3 SC70
ASQ
LM4050BEX3-2.5/V+T
2.500
0.2
50
-40°C to +125°C
3 SC70
+AVN
LM4050CEM3-2.5+T
2.500
0.5
50
-40°C to +125°C
3 SOT23
FZTW
LM4050CEX3-2.5+T
2.500
0.5
50
-40°C to +125°C
3 SC70
ASR
LM4050AEM3-3.0+T
3.000
0.1
50
-40°C to +125°C
3 SOT23
FZTX
LM4050AEX3-3.0+T
3.000
0.1
50
-40°C to +125°C
3 SC70
ASS
LM4050BEM3-3.0+T
3.000
0.2
50
-40°C to +125°C
3 SOT23
FZTY
LM4050BEM3-3.0/V+T
3.000
0.2
50
-40°C to +125°C
3 SOT23
+FZVG
LM4050BEX3-3.0+T
3.000
0.2
50
-40°C to +125°C
3 SC70
AST
LM4050CEM3-3.0+T
3.000
0.5
50
-40°C to +125°C
3 SOT23
FZTZ
LM4050CEX3-3.0+T
3.000
0.5
50
-40°C to +125°C
3 SC70
ASU
LM4050AEX3-3.3+T
3.300
0.1
50
-40°C to +125°C
3 SC70
AOJ
LM4050AEX3-3.3/V+T
3.300
0.1
50
-40°C to +125°C
3 SC70
+AUE
LM4050BEX3-3.3+T
3.300
0.2
50
-40°C to +125°C
3 SC70
AOK
LM4050CEX3-3.3+T
3.300
0.5
50
-40°C to +125°C
3 SC70
AOL
LM4050CEX3-3.3/V+T
3.300
0.5
50
-40°C to +125°C
3 SC70
+AUE
LM4050AEM3-4.1+T
4.096
0.1
50
-40°C to +125°C
3 SOT23
FZUA
LM4050AEM3-4.1/V+T
4.096
0.1
50
-40°C to +125°C
3 SOT23
+FZXU
LM4050AEX3-4.1+T
4.096
0.1
50
-40°C to +125°C
3 SC70
LM4050BEM3-4.1+T
4.096
0.2
50
-40°C to +125°C
3 SOT23
FZUB
LM4050BEM3-4.1/V+T
4.096
0.2
50
-40°C to +125°C
3 SOT23
+FZVL
LM4050BEX3-4.1+T
4.096
0.2
50
-40°C to +125°C
3 SC70
ASW
LM4050CEM3-4.1+T
4.096
0.5
50
-40°C to +125°C
3 SOT23
FZUC
ASV
*Future product—contact factory for availability.
www.maximintegrated.com
Maxim Integrated │ 12
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Ordering Information (continued)
PART
OUTPUT
INITIAL
VOLTAGE (V) ACCURACY (%)
TEMPCO
(ppm/_C)
TEMP RANGE
PIN-PACKAGE
TOP
MARK
LM4050CEX3-4.1+T
4.096
0.5
50
-40°C to +125°C
3 SC70
ASX
LM4050AEM3-5.0+T
5.000
0.1
50
-40°C to +125°C
3 SOT23
FZUD
LM4050AEM3-5.0/V+T
5.000
0.1
50
-40°C to +125°C
3 SOT23
+FZXL
LM4050AEX3-5.0+T
5.000
0.1
50
-40°C to +125°C
3 SC70
LM4050BEM3-5.0+T
5.000
0.2
50
-40°C to +125°C
3 SOT23
LM4050BEX3-5.0+T
5.000
0.2
50
-40°C to +125°C
3 SC70
ASY
FZUE
ASZ
LM4050CEM3-5.0+T
5.000
0.5
50
-40°C to +125°C
3 SOT23
FZUF
LM4050CEM3-5.0/V+T
5.000
0.5
50
-40°C to +125°C
3 SOT23
+FZVM
LM4050CEX3-5.0+T
5.000
0.5
50
-40°C to +125°C
3 SC70
ATA
LM4051AEM3-1.2+T
1.225
0.1
50
-40°C to +125°C
3 SOT23
LM4051AEX3-1.2+T
1.225
0.1
50
-40°C to +125°C
3 SC70
LM4051BEM3-1.2+T
1.225
0.2
50
-40°C to +125°C
3 SOT23
FZTP
LM4051BEX3-1.2+T
1.225
0.2
50
-40°C to +125°C
3 SC70
ASK
LM4051CEM3-1.2+T
1.225
0.5
50
-40°C to +125°C
3 SOT23
LM4051CEX3-1.2+T
1.225
0.5
50
-40°C to +125°C
3 SC70
FZTO
ASJ
FZTQ
ASL
Chip Information
PROCESS: BiCMOS
www.maximintegrated.com
Maxim Integrated │ 13
LM4050/LM4051
50ppm/°C Precision Micropower Shunt Voltage
References with Multiple Reverse Breakdown Voltages
Revision History
REVISION
NUMBER
REVISION
DATE
0
7/02
Initial release
4
5/09
Added lead-free notation and corrected topmarks in the Ordering Information
and Selector Guide sections
1, 12
5
5/11
Added automotive packages and updated the Absolute Maximum Ratings.
1, 2
6
9/11
Added automotive packages to Selector Guide and Ordering Information.
1, 12
7
1/13
Removed Selector Guide and revised Ordering Information.
1, 12
8
11/14
Added LM4050AEM3-5.0/V+T to Ordering Information.
9
11/17
Added AEC qualification statement to Benefits and Features and updated
Ordering Information table
1, 13
10
2/18
Added Package Thermal Characteristics section, updated Absolute Maximum
Ratings section, and Electrical Characteristics table
2–5
11
4/18
Updated Ordering Information table
12
12
2/19
Updated Applications and added Package Information
1, 2
13
3/19
Updated Ordering Information
12
14
5/19
Deleted Package Thermal Characteristics and old Package Information
sections, updated Ordering Information
15
7/20
Updated Package Information and Ordering Information
PAGES
CHANGED
DESCRIPTION
—
13
2, 12, 13
2, 12
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.
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.
© 2020 Maxim Integrated Products, Inc. │ 14
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