LM4050QML
May 23, 2012
Precision Micropower Shunt Voltage Reference
General Description
The LM4050QML precision voltage reference is available in
a 10 Lead Ceramic SOIC package. The LM4050QML's de-
sign eliminates the need for an external stabilizing capacitor
while ensuring stability with a capacitive load, thus making the
LM4050QML easy to use. The LM4050-2.5QML has a 60 μA
minimum and 15 mA maximum operating current. The
LM4050-5.0QML has a 74 μA minimum and 15 mA maximum
operating current.
The LM4050QML utilizes fuse and zener-zap reverse break-
down voltage trim during wafer sort to ensure that the prime
parts have an accuracy of better than ±0.1% at 25°C.
Bandgap reference temperature drift curvature correction and
low dynamic impedance ensure stable reverse breakdown
voltage accuracy over a wide range of operating tempera-
tures and currents.
The LM4050QML operates over the temperature range of
-55°C to +125°C.
Features
Low Dose Rate Qualified 100 krad(Si)
SEFI Immune
SET Immune with 60μF CLOAD
CLOADF to 100μF
Fixed reverse breakdown voltage of 2.500V, 5.000V
Key Specifications
LM4050-2.5QML
■ Output voltage tolerance IR
= 100μA±0.1% @ 25°C
■ Low temperature coefficient 15 ppm/°C
■ Low output noise 50 μVrms(typ)
■ Wide operating current range 60 μA to 15 mA
LM4050-5.0QML
■ Output voltage tolerance IR
= 100μA±0.1% @ 25°C
■ Low temperature coefficient 23 ppm/°C
■ Low output noise 100 μVrms(typ)
■ Wide operating current range 74 μA to 15 mA
Applications
Control Systems
Data Acquisition Systems
Instrumentation
Process Control
Energy Management
Ordering Information
NS Part Number SMD Part Number NS Package Number Package Description
LM4050WG2.5RLQV
Low Dose Rate Qualified
5962R0923561VZA
100 krad(Si) WG10A 10LD Ceramic SOIC
LM4050WG2.5-MPR
Pre-Flight Prototype WG10A 10LD Ceramic SOIC
LM4050WG5.0RLQV
Low Dose Rate Qualified
5962R0923562VZA
100 krad(Si) WG10A 10LD Ceramic SOIC
LM4050WG5.0-MPR
Pre-Flight Prototype WG10A 10LD Ceramic SOIC
© 2012 Texas Instruments Incorporated 301041 SNVS627E www.ti.com
LM4050QML Precision Micropower Shunt Voltage Reference
Connection Diagram
10L Ceramic SOIC
30104101
Top View
See NS Package Number WG10A
Pin Descriptions
Pin Number Pin Name Function
1 GND/NC Ground or No Connect
2 GND/NC Ground or No Connect
3 GND/NC Ground or No Connect
4 GND/NC Ground or No Connect
5 GND Ground
6 GND/NC Ground or No Connect
7 GND/NC Ground or No Connect
8 GND/NC Ground or No Connect
9 GND/NC Ground or No Connect
10 VREF Reference Voltage
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LM4050QML
Absolute Maximum Ratings (Note 1)
Reverse Current 20 mA
Forward Current 10 mA
Power Dissipation (TA = 25°C) (Note 2)
10LD Ceramic SOIC Package 467 mW
Lead Temperature
(Soldering, 10 seconds)
Ceramic SOIC 260°C
Storage Temperature -65°C to +150°C
Package Weight (typical)
Ceramic SOIC 241mg
ESD Tolerance (Note 3) Class 2 (2000V)
Operating Ratings (Note 2)
Temperature Range -55°C TA +125°C
Reverse Current
LM4050-2.5QML 60 μA to 15 mA
LM4050-5.0QML 74 μA to 15 mA
Package Thermal Resistance
Package θJA
(Still Air)
θJA
(500LF/Min
Air flow)
θJC
10L Ceramic SOIC
Package on 2 layer,
1oz PCB
214°C/ W 147°C/ W 20.87°C/ W
Quality Conformance Inspection
MIL-STD-883, Method 5005 - Group A
Subgroup Description Temp ( C)
1 Static tests at +25
2 Static tests at +125
3 Static tests at -55
4 Dynamic tests at +25
5 Dynamic tests at +125
6 Dynamic tests at -55
7 Functional tests at +25
8A Functional tests at +125
8B Functional tests at -55
9 Switching tests at +25
10 Switching tests at +125
11 Switching tests at -55
12 Setting time at +25
13 Setting time at +125
14 Setting time at -55
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LM4050QML
LM4050-2.5QML Electrical Characteristics SMD: 5962R0923561
The initial Reverse Breakdown Voltage tolerance is ±0.1% @ 100μA.
Symbol Parameter Conditions Notes Typical
(Note 4)Min Max Units Sub-
groups
VR
Reverse Breakdown Voltage IR = 100 μA 2.500 V
Reverse Breakdown Voltage
Tolerance
IR = 60µA
±2.5
mV 1
IR = 100μA ±2.5
IR = 1mA ±3.75
IR = 10mA ±10
IR = 15mA ±13
IR = 60µA
±5
mV 2
IR = 100μA ±5
IR = 1mA ±6.25
IR = 10mA ±12.5
IR = 15mA ±14
IR = 60µA
±4.5
mV 3
IR = 100μA ±4.5
IR = 1mA ±5.75
IR = 10mA ±13
IR = 15mA ±17.5
IRMIN Minimum Operating Current 40.5 60 μA1
65 μA2, 3
ΔVRT
Average Reverse Breakdown
Voltage Temperature
Coefficient
@ 25°C TA 125°C
IR = 60µA
(Note
8)
±3 ±15
ppm/°C
2
IR = 100μA±3 ±16
IR = 1mA ±3 ±18
IR = 10mA ±4 ±20
IR = 15mA ±6 ±22
Average Reverse Breakdown
Voltage Temperature
Coefficient
@ −55°C TA 25°C
IR = 60µA
(Note
8)
±3 ±18
3
IR = 100μA±3 ±19
IR = 1mA ±3.5 ±22
IR = 10mA ±10 ±32
IR = 15mA ±15 ±45
ZRReverse Dynamic Impedance IR = 1 mA, f = 120 Hz,
IAC = 0.1 IR
0.3 Ω
VNOutput Noise Voltage 0.1 Hz f 10 Hz 9 μVpp
10 Hz f 10KHz 50 μVrms
CLOAD Load Capacitor Stable Over Temperature (Note
6)60 0 100 µF
VHYST Thermal Hysteresis ΔT = −55°C to 125°C (Note
5)1 ppm
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LM4050QML
Post Radiation @ 25°C (Note 7)
The initial Reverse Breakdown Voltage tolerance is ±0.1% @ 100μA.
Symbol Parameter Conditions 30 krad 50 krad 100 krad Sub-
groups
VR
Reverse Breakdown Voltage
Tolerance
IR = 60μA
Max +0.42% +0.67% +1.5% 1
IR= 100μA
IR = 1mA
IR = 10mA
IR = 15mA
Post Radiation Tempco (Note 8)
Symbol Parameter Conditions TYPICALS
30 krad 50 krad 100 krad Units
ΔVRT
Average Reverse Breakdown
Voltage Temperature Coefficient
Drift @ 25°C TA 125°C
60μA IR 15mA +41 +83 +144 ppm/°C
Average Reverse Breakdown
Voltage Temperature Coefficient
Drift @ −55°C TA 25°C
60μA IR 15mA +46 +87 +166 ppm/°C
Operational Life Test Delta Parameters
This table represents the drift seen from initial measurements post 1000hr Operational Life Burn-In. All units will remain within the
electrical characteristics limits post 1000hr Operational Life Burn-In. Deltas required for QMLV product at Group B, Sub-Group 5.
Symbol Parameter Conditions Note Min Max Units Temp
VR
Reverse Breakdonwn
Voltage Tolerance
IR = 60µA
-0.873 0.873
mV 1
IR = 100µA -0.873 0.873
IR = 1mA -0.998 0.998
IR = 10mA -3.93 3.93
IR = 15mA -5 5
IRMIN
Minimum Operating
Current -0.623 0.623 µA 1
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LM4050QML
LM4050-5.0QML Electrical Characteristics SMD: 5962R0923562
The initial Reverse Breakdown Voltage tolerance is ±0.1% @ 100μA.
Symbol Parameter Conditions Notes Typical
(Note 4)Min Max Units Sub-
groups
VR
Reverse Breakdown Voltage IR = 100 μA 5.000 V
Reverse Breakdown Voltage
Tolerance
IR = 74µA
±5.0
mV 1
IR = 100μA ±5.0
IR = 1mA ±8
IR = 10mA ±18
IR = 15mA ±20
IR = 74µA
±10
mV 2
IR = 100μA ±10
IR = 1mA ±12
IR = 10mA ±22.5
IR = 15mA ±28
IR = 74µA
±9
mV 3
IR = 100μA ±9
IR = 1mA ±11.5
IR = 10mA ±29
IR = 15mA ±37
IRMIN Minimum Operating Current 53 70 μA1
74 μA2, 3
ΔVRT
Average Reverse Breakdown
Voltage Temperature
Coefficient
@ 25°C TA 125°C
IR = 74µA
(Note
8)
±9 ±23
ppm/°C
2
IR = 100μA±9 ±25
IR = 1mA ±10 ±28
IR = 10mA ±11 ±35
IR = 15mA ±11 ±40
Average Reverse Breakdown
Voltage Temperature
Coefficient
@ −55°C TA 25°C
IR = 74µA
(Note
8)
±10 ±25
3
IR = 100μA±10 ±29
IR = 1mA ±10 ±34
IR = 10mA ±15 ±45
IR = 15mA ±20 ±60
ZRReverse Dynamic Impedance IR = 1 mA, f = 120 Hz,
IAC = 0.1 IR
0.5 Ω
VNOutput Noise Voltage 10 Hz f 10KHz 100 μVrms
CLOAD Load Capacitor Stable Over Temperature (Note
6)60 0 100 µF
VHYST Thermal Hysteresis ΔT = -55°C to 125°C (Note
5)20 ppm
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LM4050QML
Post Radiation @ 25°C (Note 7)
The initial Reverse Breakdown Voltage tolerance is ±0.1% @ 100μA.
Symbol Parameter Conditions 30 krad 50 krad 100 krad Sub-
groups
VR
Reverse Breakdown Voltage
Tolerance
IR = 74μA
Max +0.37% +0.61% +1.75% 1
IR= 100μA
IR = 1mA
IR = 10mA
IR = 15mA
Post Radiation Tempco (Note 8)
Symbol Parameter Conditions TYPICALS
30 krad 50 krad 100 krad Units
ΔVRT
Average Reverse Breakdown
Voltage Temperature Coefficient
Drift @ 25°C TA 125°C
74μA IR 15mA +87 +166 +387 ppm/°C
Average Reverse Breakdown
Voltage Temperature Coefficient
Drift @ −55°C TA 25°C
74μA IR 15mA +96 +162 +343 ppm/°C
Operational Life Test Delta Parameters
This table represents the drift seen from initial measurements post 1000hr Operational Life Burn-In. All units will remain within the
electrical characteristics limits post 1000hr Operational Life Burn-In. Deltas required for QMLV product at Group B, Sub-Group 5.
Symbol Parameter Conditions Note Min Max Units Temp
VR
Reverse Breakdonwn
Voltage Tolerance
IR = 74µA
−0.8 0.8
mV 1
IR = 100µA −0.8 0.8
IR = 1mA −0.84 0.84
IR = 10mA −1.6 1.6
IR = 15mA −2.6 2.6
IRMIN
Minimum Operating
Current −0.623 0.623 µA 1
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to
ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax − TA)/θJA or the
number given in the Absolute Maximum Ratings, whichever is lower. For the LM4050QML, TJmax = 125°C, and the typical thermal resistance (θJA), when board
mounted, is 214°C/W for the 10 Lead Ceramic SOIC package.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 4: Typicals are at TA = 25°C and represent most likely parametric norm.
Note 5: Thermal hysteresis is defined as the change in voltage measured at +25°C after cycling to temperature -55°C and the 25°C measurement after cycling
to temperature +125°C.
Where: VHYST = Thermal hysteresis expressed in ppm
VR = Nominal preset output voltage
VR1 = VR before temperature fluctuation
VR2 = VR after temperature fluctuation.
Note 6: Capacitive load not required but improves SET stability. This parameter is guaranteed by design and/or characterization and is not tested in production.
Note 7: Pre and post irradiation limits are identical to those listed under electrical characteristics except as listed in the post radiation table.
Note 8: Not tested post irradiation. Typical post irradiation values listed in the post radiation Tempco table.
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LM4050QML
Typical Performance Characteristics
Output Impedance vs Frequency
30104110
Output Impedance vs Frequency
30104111
Reverse Characteristics and
Minimum Operating Current
30104112
2.5V Thermal Hysteresis
30104129
5.0V Thermal Hysteresis
30104130
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LM4050QML
Typical Radiation Characteristics
2.5V Low Dose Rate Drift at 10 mrad(Si)/s
30104123
5V Low Dose Rate Drift at 10 mrad(Si)/s
30104124
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LM4050QML
Start-Up Characteristics
30104105
LM4050-2.5QML RS = 30k
30104107
LM4050-5.0QML RS = 30k
30104108
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LM4050QML
Functional Block Diagram
30104114
Applications Information
The LM4050QML is a precision micro-power curvature-cor-
rected bandgap shunt voltage reference. The LM4050QML is
available in the 10 Lead Ceramic SOIC package. The
LM4050QML has been designed for stable operation without
the need of an external capacitor connected between the “+”
pin and the “−” pin. If, however, a bypass capacitor is used,
the LM4050QML remains stable. The LM4050-2.5QML has a
60 μA minimum and 15 mA maximum operating current. The
LM4050-5.0QML has a 74 μA minimum and 15 mA maximum
operating current.
The typical thermal hysteresis specification is defined as the
change in +25°C voltage measured after thermal cycling. The
device is thermal cycled to temperature -55°C and then mea-
sured at 25°C. Next the device is thermal cycled to tempera-
ture +125°C and again measured at 25°C. The resulting
VOUT delta shift between the 25°C measurements is thermal
hysteresis. Thermal hysteresis is common in precision refer-
ences and is induced by thermal-mechanical package stress.
Changes in environmental storage temperature, operating
temperature and board mounting temperature are all factors
that can contribute to thermal hysteresis.
In a conventional shunt regulator application (Figure 1) , an
external series resistor (RS) is connected between the supply
voltage and the LM4050QML. RS determines the current that
flows through the load (IL) and the LM4050QML (IQ). Since
load current and supply voltage may vary, RS should be small
enough to supply at least the maximum guaranteed IRMIN
(spec. table) to the LM4050QML even when the supply volt-
age is at its minimum and the load current is at its maximum
value. When the supply voltage is at its maximum and IL is at
its minimum, RS should be large enough so that the current
flowing through the LM4050QML is less than 15 mA.
RS is determined by the supply voltage, (VS), the load and
operating current, (IL and IQ), and the LM4050QML's reverse
breakdown voltage, VR.
Radiation Environments
Careful consideration should be given to environmental con-
ditions when using a product in a radiation environment.
TOTAL IONIZING DOSE
Radiation hardness assured (RHA) products are those part
numbers with a total ionizing dose (TID) level specified in the
Ordering Information table on the front page. Testing and
qualification of these products is done on a wafer level ac-
cording to MIL-STD-883, Test Method 1019. Wafer level TID
data is available with lot shipments.
Testing and qualification is performed at the 30, 50 and 100
krad TID levels at a dose rate of 10 mrad/s, using a 1.5X
overtest at each TID level. For the 30 krad level units are
tested to 50 krad, for 50 krad units are tested to 80 krad and
for 100 krad units are tested to 150 krad, with all parameters
remaining inside the post irradiation test limits.
SINGLE EVENT EFFECTS (SEE)
One time single event effects characterization was performed
according to EIA/JEDEC Standard, EIA/JEDEC57.
A test report is available upon request.
SINGLE EVENT TRANSIENTS (SET)
With a 60 µF capacitor on the output, no single event tran-
sients were seen at the highest linear energy transfer (LET)
tested: 59 MeV-cm2/mg.
SET characterization with other capacitor values is in the SEE
report, available upon request.
SINGLE EVENT FUNCTIONAL INTERRUPT (SEFI)
No single event functional interrupts were detected to the
highest linear energy transfer (LET) tested: 100 MeV-cm2/mg.
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LM4050QML
Typical Applications
30104115
FIGURE 1. Shunt Regulator
30104120
FIGURE 2. The LM4050QML as a power supply and reference
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LM4050QML
30104119
FIGURE 3. The LM4050QML as a power supply and reference
The LM4050QML is a good choice as a power regulator for the DAC121S101QML or ADC128S102QML. The minimum resistor
value in the circuit of Figure 2 or Figure 3 should be chosen such that the maximum current through the LM4050QML does not
exceed its 15 mA rating. The conditions for maximum current include the input voltage at its maximum, the LM4050QML voltage
at its minimum, the resistor value at its minimum due to tolerance, and the DAC121S101QML or ADC128S102QML draws zero
current. The maximum resistor value must allow the LM4050QML to draw more than its minimum current for regulation plus the
maximum DAC121S101QML or ADC128S102QML current in full operation. The conditions for minimum current include the input
voltage at its minimum, the LM4050QML voltage at its maximum, the resistor value at its maximum due to tolerance, and the
DAC121S101QML or ADC128S102QML draws its maximum current. These conditions can be summarized as
R(min) = ( VIN(max) − VZ(min) / (IA(min) + IZ(max)
and
R(max) = ( VIN(min) − VZ(max) / (IA(max) + IZ(min)
where VZ(min) and VZ(max) are the nominal LM4050QML output voltages ± the LM4050QML output tolerance over temperature,
IZ(max) is the maximum allowable current through the LM4050QML, IZ(min) is the minimum current required by the LM4050QML
for proper regulation, IA(max) is the maximum DAC121S101QML or ADC128S102QML supply current, and IA(min) is the minimum
DAC121S101QML or ADC128S102QML supply current.
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LM4050QML
30104117
FIGURE 4. Bounded amplifier reduces saturation-induced delays and can prevent succeeding stage damage.
Nominal clamping voltage is ±11.5V (LM4050QML's reverse breakdown voltage +2 diode VF).
30104118
FIGURE 5. Protecting Op Amp input. The bounding voltage is ±4V with the LM4050-2.5QML
(LM4050QML's reverse breakdown voltage + 3 diode VF).
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LM4050QML
30104121
30104122
FIGURE 6. Precision 1 μA to 1 mA Current Sources
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LM4050QML
Revision History
Date Released Revision Section Changes
08/20/2010 A Initial Release New Product Low Dose Qualified LM4050WG2.5RLQV
Initial Release
01/20/2012 B
General Description,
Features, Key Specifications,
Ordering Table, Operating
Ratings, Package Thermal
Table, Electrical Section
General Description, Features, Key Specifications,
Ordering Table, Operating Ratings, Package Thermal
Table, Electrical Section — Added the 5.0 V option
information for all sections. Added new NSIDS
LM4050WG5.0RLQV and LM4050WG5.0–MPR Voltage
option to data sheet. Revision A will be Archived.
05/23/2012 C Electrical Section
Electrical Section — Updated Delta Vr/Delta T for typical
limits for both the 2.5 and 5.0 versions. Revision B will be
Archived.
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LM4050QML
Physical Dimensions inches (millimeters) unless otherwise noted
10 Lead Ceramic SOIC
NS Package Number WG10A
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LM4050QML
Notes
LM4050QML Precision Micropower Shunt Voltage Reference
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