LM4050
LM4050/LM4050Q Precision Micropower Shunt Voltage Reference
Literature Number: SNOS455D
LM4050/LM4050Q
November 10, 2011
Precision Micropower Shunt Voltage Reference
General Description
Ideal for space critical applications, the LM4050 precision
voltage reference is available in the sub-miniature (3 mm x
1.3 mm) SOT-23 surface-mount package. The LM4050's de-
sign eliminates the need for an external stabilizing capacitor
while ensuring stability with any capacitive load, thus making
the LM4050 easy to use. Further reducing design effort is the
availability of several fixed reverse breakdown voltages:
2.048V, 2.500V, 4.096V, 5.000V, 8.192V, and 10.000V. The
minimum operating current increases from 60 μA for the
LM4050-2.0 to 100 μA for the LM4050-10.0. All versions have
a maximum operating current of 15 mA.
The LM4050 utilizes fuse and zener-zap reverse breakdown
voltage trim during wafer sort to ensure that the prime parts
have an accuracy of better than ±0.1% (A grade) 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.
All grades and voltage options of the LM4050 are available in
both an industrial temperature range (−40°C and +85°C) and
an extended temperature range (−40°C and +125°C).
Features
■Small packages: SOT-23
■No output capacitor required
■Tolerates capacitive loads
■Fixed reverse breakdown voltages of 2.048V, 2.500V,
4.096V, 5.000V, 8.192V, and 10.000V
Key Specifications (LM4050-2.5)
■ Output voltage tolerance
(A grade, 25°C) ±0.1% (max)
■ Low output noise
(10 Hz to 10 kHz) 41 μVrms(typ)
■ Wide operating current range 60 μA to 15 mA
■ Industrial temperature range −40°C to +85°C
■ Extended temperature range −40°C to +125°C
■ Low temperature coefficient 50 ppm/°C (max)
■ LM4050QA/QB/QC are AEC-
Q100 Grade 1 qualified and are
manufactured on an automotive
grade flow
Applications
■Portable, Battery-Powered Equipment
■Data Acquisition Systems
■Instrumentation
■Process Control
■Energy Management
■Product Testing
■Automotive
■Precision Audio Components
Connection Diagram
SOT-23
10104501
*This pin must be left floating or connected to pin 2.
Top View
See NS Package Number MF03A
© 2011 Texas Instruments Incorporated 101045 www.ti.com
LM4050/LM4050Q Precision Micropower Shunt Voltage Reference
Ordering Information
Industrial Temperature Range (−40°C to +85°C)
Reverse Breakdown
Voltage Tolerance at 25°C and Average Reverse
Breakdown
Voltage Temperature Coefficient
LM4050 Supplied as 1000 Units, Tape
and Reel
LM4050 Supplied as 3000 Units, Tape
and Reel
LM4050AIM3-2.0 LM4050AIM3X-2.0
±0.1%, 50 ppm/°C max (A grade)
LM4050AIM3-2.5 LM4050AIM3X-2.5
LM4050AIM3-4.1 LM4050AIM3X-4.1
LM4050AIM3-5.0 LM4050AIM3X-5.0
LM4050AIM3-8.2 LM4050AIM3X-8.2
LM4050AIM3-10 LM4050AIM3X-10
LM4050BIM3-2.0 LM4050BIM3X-2.0
±0.2%, 50 ppm/°C max (B grade)
LM4050BIM3-2.5 LM4050BIM3X-2.5
LM4050BIM3-4.1 LM4050BIM3X-4.1
LM4050BIM3-5.0 LM4050BIM3X-5.0
LM4050BIM3-8.2 LM4050BIM3X-8.2
LM4050BIM3-10 LM4050BIM3X-10
LM4050CIM3-2.0 LM4050CIM3X-2.0
±0.5%, 50 ppm/°C max (C grade)
LM4050CIM3-2.5 LM4050CIM3X-2.5
LM4050CIM3-4.1 LM4050CIM3X-4.1
LM4050CIM3-5.0 LM4050CIM3X-5.0
LM4050CIM3-8.2 LM4050CIM3X-8.2
LM4050CIM3-10 LM4050CIM3X-10
Extended Temperature Range (−40°C to +125°C)
Reverse Breakdown
Voltage Tolerance at 25°C and Average Reverse
Breakdown
Voltage Temperature Coefficient
LM4050 Supplied as 1000 Units, Tape
and Reel
LM4050 Supplied as 3000 Units, Tape
and Reel
LM4050AEM3-2.0 LM4050AEM3X-2.0
±0.1%, 50 ppm/°C max (A grade)
LM4050AEM3-2.5 LM4050AEM3X-2.5
LM4050AEM3-4.1 LM4050AEM3X-4.1
LM4050AEM3-5.0 LM4050AEM3X-5.0
LM4050AEM3-8.2 LM4050AEM3X-8.2
LM4050AEM3-10 LM4050AEM3X-10
LM4050BEM3-2.0 LM4050BEM3X-2.0
±0.2%, 50 ppm/°C max (B grade)
LM4050BEM3-2.5 LM4050BEM3X-2.5
LM4050BEM3-4.1 LM4050BEM3X-4.1
LM4050BEM3-5.0 LM4050BEM3X-5.0
LM4050BEM3-8.2 LM4050BEM3X-8.2
LM4050BEM3-10 LM4050BEM3X-10
LM4050CEM3-2.0 LM4050CEM3X-2.0
±0.5%, 50 ppm/°C max (C grade)
LM4050CEM3-2.5 LM4050CEM3X-2.5
LM4050CEM3-4.1 LM4050CEM3X-4.1
LM4050CEM3-5.0 LM4050CEM3X-5.0
LM4050CEM3-8.2 LM4050CEM3X-8.2
LM4050CEM3-10 LM4050CEM3X-10
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LM4050/LM4050Q
Industrial Temperature Range (−40°C to +85°C)
Reverse Breakdown
Voltage Tolerance at 25°C and Average Reverse
Breakdown
Voltage Temperature Coefficient
LM4050Q Supplied as 1000 Units,
Tape and Reel
LM4050Q Supplied as 3000 Units,
Tape and Reel
LM4050QAIM3-2.0 LM4050QAIM3X2.0
±0.1%, 50 ppm/°C max (Q A grade)
LM4050QAIM3-2.5 LM4050QAIM3X2.5
LM4050QAIM3-4.1 LM4050QAIM3X4.1
LM4050QAIM3-5.0 LM4050QAIM3X5.0
LM4050QAIM3-8.2 LM4050QAIM3X8.2
LM4050QAIM3-10 LM4050QAIM3X10
LM4050QBIM3-2.0 LM4050QBIM3X2.0
±0.2%, 50 ppm/°C max (Q B grade)
LM4050QBIM3-2.5 LM4050QBIM3X2.5
LM4050QBIM3-4.1 LM4050QBIM3X4.1
LM4050QBIM3-5.0 LM4050QBIM3X5.0
LM4050QBIM3-8.2 LM4050QBIM3X8.2
LM4050QBIM3-10 LM4050QBIM3X10
LM4050QCIM3-2.0 LM4050QCIM3X2.0
±0.5%, 50 ppm/°C max (Q C grade)
LM4050QCIM3-2.5 LM4050QCIM3X2.5
LM4050QCIM3-4.1 LM4050QCIM3X4.1
LM4050QCIM3-5.0 LM4050QCIM3X5.0
LM4050QCIM3-8.2 LM4050QCIM3X8.2
LM4050QCIM3-10 LM4050QCIM3X10
Extended Temperature Range (−40°C to +125°C)
Reverse Breakdown
Voltage Tolerance at 25°C and Average Reverse
Breakdown
Voltage Temperature Coefficient
LM4050Q Supplied as 1000 Units,
Tape and Reel
LM4050Q Supplied as 3000 Units,
Tape and Reel
LM4050QAEM3-2.0 LM4050QAEM3X2.0
±0.1%, 50 ppm/°C max (Q A grade)
LM4050QAEM3-2.5 LM4050QAEM3X2.5
LM4050QAEM3-4.1 LM4050QAEM3X4.1
LM4050QAEM3-5.0 LM4050QAEM3X5.0
LM4050QAEM3-8.2 LM4050QAEM3X8.2
LM4050QAEM3-10 LM4050QAEM3X10
LM4050QBEM3-2.0 LM4050QBEM3X2.0
±0.2%, 50 ppm/°C max (Q B grade)
LM4050QBEM3-2.5 LM4050QBEM3X2.5
LM4050QBEM3-4.1 LM4050QBEM3X4.1
LM4050QBEM3-5.0 LM4050QBEM3X5.0
LM4050QBEM3-8.2 LM4050QBEM3X8.2
LM4050QBEM3-10 LM4050QBEM3X10
LM4050QCEM3-2.0 LM4050QCEM3X2.0
±0.5%, 50 ppm/°C max (Q C grade)
LM4050QCEM3-2.5 LM4050QCEM3X2.5
LM4050QCEM3-4.1 LM4050QCEM3X4.1
LM4050QCEM3-5.0 LM4050QCEM3X5.0
LM4050QCEM3-8.2 LM4050QCEM3X8.2
LM4050QCEM3-10 LM4050QCEM3X10
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LM4050/LM4050Q
SOT-23 Package Marking Information
Only three fields of marking are possible on the SOT-23's small surface. This table gives the meaning of the three fields.
Part Marking Field Definition
RCA First Field:
RDA R = Reference
REA Second Field:
RFA N = 2.048V Voltage Option
RGA C = 2.500V Voltage Option
RNA D = 4.096V Voltage Option
RCB E = 5.000V Voltage Option
RDB F = 8.192V Voltage Option
REB G = 10.000V Voltage Option
RFB
RGB Third Field:
RNB
RCC A–C = Initial Reverse Breakdown Voltage or Reference Voltage Tolerance
RDC A = ±0.1%, B = ±0.2%, C = +0.5%,
REC
RFC
RGC
RNC
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LM4050/LM4050Q
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the Texas Instruments Sales Office/
Distributors for availability and specifications.
Reverse Current 20 mA
Forward Current 10 mA
Power Dissipation (TA = 25°C) (Note 2)
M3 Package 280 mW
Storage Temperature −65°C to +150°C
Lead Temperature
M3 Package
Vapor phase (60 seconds) +215°C
Infrared (15 seconds) +220°C
ESD Susceptibility
Human Body Model (Note 3) 2 kV
Machine Model (Note 3) 200V
See AN-450 “Surface Mounting Methods and Their Effect on
Product Reliability” for other methods of soldering surface
mount devices.
Operating Ratings (Note 2)
Temperature Range (Tmin ≤ TA ≤ Tmax)
Industrial Temperature
Range −40°C ≤ TA ≤ +85°C
Extended temperature
Range −40°C ≤ TA ≤ +125°C
Reverse Current
LM4050-2.0, 60 μA to 15 mA
LM4050-2.5 60 μA to 15 mA
LM4050-4.1 68 μA to 15 mA
LM4050-5.0 74 μA to 15 mA
LM4050-8.2 91 μA to 15 mA
LM4050-10.0 100 μA to 15 mA
LM4050-2.0
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. The grades A, B and C designate initial Reverse
Breakdown Voltage tolerances of ±0.1%, ±0.2%, and 0.5% respectively.
Symbol Parameter Conditions Typical
(Note 4)
LM4050AIM3
LM4050AEM
3
Limits
(Note 5)
LM4050BIM3
LM4050BEM
3
Limits
(Note 5)
LM4050CIM
3
LM4050CEM
3
Limits
(Note 5)
Units
(Limit)
VR
Reverse Breakdown
Voltage
IR = 100 μA2.048 V
Reverse Breakdown
Voltage Tolerance (Note 6)
IR = 100 μA ±2.048 ±4.096 ±10.24 mV (max)
Industrial Temp. Range ±9.0112 ±11.4688 ±14.7456 mV (max)
Extended Temp.
Range
±12.288 ±14.7456 ±17.2032 mV (max)
IRMIN Minimum Operating Current 41 μA
60 60 60 μA (max)
65 65 65 μA (max)
ΔVR/ΔTAverage Reverse
Breakdown Voltage
Temperature Coefficient
(Note 6)
IR = 10 mA ±20 ppm/°C
IR = 1 mA ±15 ppm/°C
IR = 100 μA±15 ±50 ±50 ±50 ppm/°C (max)
ΔVR/ΔIRReverse Breakdown
Voltage Change with
Operating Current Change
(Note 7)
IRMIN ≤ IR ≤ 1 mA 0.3 mV
0.8 0.8 0.8 mV (max)
1.2 1.2 1.2 mV (max)
1 mA ≤ IR ≤ 15 mA 2.3 mV
6.0 6.0 6.0 mV (max)
8.0 8.0 8.0 mV (max)
ZRReverse Dynamic
Impedance
IR = 1 mA, f = 120 Hz,
IAC = 0.1 IR
0.3 Ω
eNWideband Noise IR = 100 μA34 μVrms
10 Hz ≤ f ≤ 10 kHz
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LM4050/LM4050Q
Symbol Parameter Conditions Typical
(Note 4)
LM4050AIM3
LM4050AEM
3
Limits
(Note 5)
LM4050BIM3
LM4050BEM
3
Limits
(Note 5)
LM4050CIM
3
LM4050CEM
3
Limits
(Note 5)
Units
(Limit)
ΔVRReverse Breakdown
Voltage Long Term Stability
t = 1000 hrs
T = 25°C ±0.1°C
IR = 100 μA
120 ppm
VHYST Thermal Hysteresis
(Note 8)
ΔT = −40°C to 125°C 0.7 mV
LM4050-2.5
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. The grades A, B and C designate initial Reverse
Breakdown Voltage tolerances of ±0.1%, ±0.2%, and 0.5% respectively.
Symbol Parameter Conditions Typical
(Note 4)
LM4050AI
M3
LM4050AE
M3
Limits
(Note 5)
LM4050BI
M3
LM4050BE
M3
Limits
(Note 5)
LM4050CI
M3
LM4050CE
M3
Limits
(Note 5)
Units
(Limit)
VRReverse Breakdown Voltage IR = 100 μA2.500 V
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 100 μA ±2.5 ±5.0 ±13 mV (max)
Industrial Temp. Range ±11 ±14 ±21 mV (max)
Extended Temp. Range ±15 ±18 ±25 mV (max)
IRMIN Minimum Operating Current 41 μA
60 60 60 μA (max)
65 65 65 μA (max)
ΔVR/ΔTAverage Reverse Breakdown
Voltage Temperature
Coefficient (Note 6)
IR = 10 mA ±20 ppm/°C
IR = 1 mA ±15 ppm/°C
IR = 100 μA±15 ±50 ±50 ±50 ppm/°C (max)
ΔVR/ΔIRReverse Breakdown Voltage
Change with Operating
Current Change (Note 7)
IRMIN ≤ IR ≤ 1 mA 0.3 mV
0.8 0.8 0.8 mV (max)
1.2 1.2 1.2 mV (max)
1 mA ≤ IR ≤ 15 mA 2.3 mV
6.0 6.0 6.0 mV (max)
8.0 8.0 8.0 mV (max)
ZRReverse Dynamic Impedance IR = 1 mA, f = 120 Hz,
IAC = 0.1 IR
0.3 Ω
eNWideband Noise IR = 100 μA41 μVrms
10 Hz ≤ f ≤ 10 kHz
ΔVRReverse Breakdown Voltage
Long Term Stability
t = 1000 hrs
T = 25°C ±0.1°C
IR = 100 μA
120 ppm
VHYST Thermal Hysteresis
(Note 8)
ΔT = −40°C to 125°C 0.7 mV
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LM4050/LM4050Q
LM4050-4.1
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. The grades A, B and C designate initial Reverse
Breakdown Voltage tolerances of ±0.1%, ±0.2%, and 0.5% respectively.
Symbol Parameter Conditions Typical
(Note 4)
LM4050AI
M3
LM4050AE
M3
Limits
(Note 5)
LM4050BI
M3
LM4050BE
M3
Limits
(Note 5)
LM4050CI
M3
LM4050CE
M3
Limits
(Note 5)
Units
(Limit)
VRReverse Breakdown Voltage IR = 100 μA4.096 V
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 100 μA ±4.1 ±8.2 ±21 mV (max)
Industrial Temp. Range ±18 ±22 ±34 mV (max)
Extended Temp. Range ±25 ±29 ±41 mV (max)
IRMIN Minimum Operating Current 52 μA
68 68 68 μA (max)
Industrial Temp. Range 73 73 73 μA (max)
Extended Temp. Range 78 78 78 μA (max)
ΔVR/ΔTAverage Reverse Breakdown
Voltage Temperature
Coefficient (Note 6)
IR = 10 mA ±30 ppm/°C
IR = 1 mA ±20 ppm/°C
IR = 100 μA±20 ±50 ±50 ±50 ppm/°C (max)
ΔVR/ΔIRReverse Breakdown Voltage
Change with Operating
Current Change (Note 7)
IRMIN ≤ IR ≤ 1 mA 0.2 mV
0.9 0.9 0.9 mV (max)
1.2 1.2 1.2 mV (max)
1 mA ≤ IR ≤ 15 mA 2.0 mV
7.0 7.0 7.0 mV (max)
10.0 10.0 10.0 mV (max)
ZRReverse Dynamic Impedance IR = 1 mA, f = 120 Hz, 0.5 Ω
IAC = 0.1 IR
eNWideband Noise IR = 100 μA93 μVrms
10 Hz ≤ f ≤ 10 kHz
ΔVRReverse Breakdown Voltage
Long Term Stability
t = 1000 hrs
T = 25°C ±0.1°C
IR = 100 μA
120 ppm
VHYST Thermal Hysteresis
(Note 8)
ΔT = −40°C to 125°C 1.148 mV
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LM4050/LM4050Q
LM4050-5.0
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. The grades A, B and C designate initial Reverse
Breakdown Voltage tolerances of ±0.1%, ±0.2% and 0.5% respectively.
Symbol Parameter Conditions Typical
(Note 4)
LM4050AI
M3
LM4050AE
M3
Limits
(Note 5)
LM4050BI
M3
LM4050BE
M3
Limits
(Note 5)
LM4050CI
M3
LM4050CE
M3
Limits
(Note 5)
Units
(Limit)
VRReverse Breakdown Voltage IR = 100 μA5.000 V
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 100 μA ±5.0 ±10 ±25 mV (max)
Industrial Temp. Range ±22 ±27 ±42 mV (max)
Extended Temp. Range ±30 ±35 ±50 mV (max)
IRMIN Minimum Operating Current 56 μA
74 74 74 μA (max)
Industrial Temp. Range 80 80 80 μA (max)
Extended Temp. Range 90 90 90 μA (max)
ΔVR/ΔTAverage Reverse Breakdown
Voltage Temperature
Coefficient (Note 6)
IR = 10 mA ±30 ppm/°C
IR = 1 mA ±20 ppm/°C
IR = 100 μA±20 ±50 ±50 ±50 ppm/°C
(max)
ΔVR/ΔIRReverse Breakdown Voltage
Change with Operating
Current Change (Note 7)
IRMIN ≤ IR ≤ 1 mA 0.2 mV
1.0 1.0 1.0 mV (max)
1.4 1.4 1.4 mV (max)
1 mA ≤ IR ≤ 15 mA 2.0 mV
8.0 8.0 8.0 mV (max)
12.0 12.0 12.0 mV (max)
ZRReverse Dynamic Impedance IR = 1 mA, f = 120 Hz, 0.5 Ω
IAC = 0.1 IR Ω (max)
eNWideband Noise IR = 100 μA93 μVrms
10 Hz ≤ f ≤ 10 kHz
ΔVRReverse Breakdown Voltage
Long Term Stability
t = 1000 hrs
T = 25°C ±0.1°C 120 ppm
IR = 100 μA
VHYST Thermal Hysteresis
(Note 8)
ΔT = −40°C to 125°C 1.4 mV
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LM4050/LM4050Q
LM4050-8.2
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. The grades A, B and C designate initial Reverse
Breakdown Voltage tolerances of ±0.1% and ±0.2% and 0.5% respectively.
Symbol Parameter Conditions Typical
(Note 4)
LM4050AI
M3
LM4050AE
M3
Limits
(Note 5)
LM4050BI
M3
LM4050BE
M3
Limits
(Note 5)
LM4050CI
M3
LM4050CE
M3
Limits
(Note 5)
Units
(Limit)
VRReverse Breakdown Voltage IR = 150 μA8.192 V
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 150 μA ±8.2 ±16 ±41 mV (max)
Industrial Temp. Range ±35 ±43 ±68 mV (max)
Extended Temp. Range ±49 ±57 ±82 mV (max)
IRMIN Minimum Operating Current 74 μA
91 91 91 μA (max)
Industrial Temp. Range 95 95 95 μA (max)
Extended Temp. Range 100 100 100 μA (max)
ΔVR/ΔTAverage Reverse Breakdown
Voltage Temperature
Coefficient (Note 6)
IR = 10 mA ±40 ppm/°C
IR = 1 mA ±20 ppm/°C
IR = 150 μA±20 ±50 ±50 ±50 ppm/°C
(max)
ΔVR/ΔIRReverse Breakdown Voltage
Change with Operating
Current Change (Note 7)
IRMIN ≤ IR ≤ 1 mA 0.6 mV
1.3 1.3 1.3 mV (max)
2.5 2.5 2.5 mV (max)
1 mA ≤ IR ≤ 15 mA 7.0 mV
10.0 10.0 10.0 mV (max)
18.0 18.0 18.0 mV (max)
ZRReverse Dynamic Impedance IR = 1 mA, f = 120 Hz, 0.6 Ω
IAC = 0.1 IR
eNWideband Noise IR = 150 μA150 μVrms
10 Hz ≤ f ≤ 10 kHz
ΔVRReverse Breakdown Voltage
Long Term Stability
t = 1000 hrs
T = 25°C ±0.1°C 120 ppm
IR = 150 μA
VHYST Thermal Hysteresis
(Note 8)
ΔT = −40°C to 125°C 2.3 mV
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LM4050/LM4050Q
LM4050-10.0
Electrical Characteristics
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. The grades A, B and C designate initial Reverse
Breakdown Voltage tolerances of ±0.1% and ±0.2% and 0.5% respectively.
Symbol Parameter Conditions
Typical
(Note 4)
LM4050AI
M3
LM4050AE
M3
Limits
(Note 5)
LM4050BI
M3
LM4050BE
M3
Limits
(Note 5)
LM4050CI
M3
LM4050CE
M3
Limits
(Note 5)
Units
(Limit)
VRReverse Breakdown Voltage IR = 150 μA10.00 V
Reverse Breakdown Voltage
Tolerance (Note 6)
IR = 150 μA ±10 ±20 ±50 mV (max)
Industrial Temp. Range ±43 ±53 ±83 mV (max)
Extended Temp. Range ±60 ±70 ±100 mV (max)
IRMIN Minimum Operating Current 80 μA
100 100 100 μA (max)
Industrial Temp. Range 103 103 103 μA (max)
Extended Temp. Range 110 110 110 μA (max)
ΔVR/ΔTAverage Reverse Breakdown
Voltage Temperature
Coefficient (Note 6)
IR = 10 mA ±40 ppm/°C
IR = 1 mA ±20 ppm/°C
IR = 150 μA±20 ±50 ±50 ±50 ppm/°C
(max)
ΔVR/ΔIRReverse Breakdown Voltage
Change with Operating
Current Change (Note 7)
IRMIN ≤ IR ≤ 1 mA 0.8 mV
1.5 1.5 1.5 mV (max)
3.5 3.5 3.5 mV (max)
1 mA ≤ IR ≤ 15 mA 8.0 mV
12.0 12.0 12.0 mV (max)
23.0 23.0 23.0 mV (max)
ZRReverse Dynamic Impedance IR = 1 mA, f = 120 Hz, 0.7 Ω
IAC = 0.1 IR
eNWideband Noise IR = 150 μA150 μVrms
10 Hz ≤ f ≤ 10 kHz
ΔVRReverse Breakdown Voltage
Long Term Stability
t = 1000 hrs
T = 25°C ±0.1°C 120 ppm
IR = 150 μA
VHYST Thermal Hysteresis
(Note 8)
ΔT = −40°C to 125°C 2.8 mV
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 LM4050, TJmax = 125°C, and the typical thermal resistance (θJA), when board mounted,
is 326°C/W for the SOT-23 package.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin.
Note 4: Typicals are at TJ = 25°C and represent most likely parametric norm.
Note 5: Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQC) methods.
The limits are used to calculate National's AOQL.
Note 6: The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage
Tolerance ±[(ΔV R/ΔT)(maxΔT)(VR)]. Where, ΔVR/ΔT is the VR temperature coefficient, maxΔT is the maximum difference in temperature from the reference point
of 25°C to T MIN or TMAX, and VR is the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature
range where maxΔT = 65°C is shown below:
A-grade: ±0.425% = ±0.1% ±50 ppm/°C × 65°C
B-grade: ±0.525% = ±0.2% ±50 ppm/°C × 65°C
www.ti.com 10
LM4050/LM4050Q
C-grade: ±0.825% = ±0.5% ±50 ppm/°C × 65°C
Therefore, as an example, the A-grade LM4050-2.5 has an over-temperature Reverse Breakdown Voltage tolerance of ±2.5V × 0.425% = ±11 mV.
Note 7: Load regulation is measured on pulse basis from no load to the specified load current. Output changes due to die temperature change must be taken
into account separately.
Note 8: Thermal hysteresis is defined as the difference in voltage measured at +25°C after cycling to temperature -40°C and the 25°C measurement after cycling
to temperature +125°C.
Typical Performance Characteristics
Output Impedance vs Frequency
10104510
Output Impedance vs Frequency
10104511
Reverse Characteristics and
Minimum Operating Current
10104512
Noise Voltage vs Frequency
10104513
11 www.ti.com
LM4050/LM4050Q
Thermal Hysteresis
10104529
Start-Up Characteristics
10104505
LM4050-2.5 RS = 30k
10104507
LM4050-5.0 RS = 30k
10104508
LM4050-10.0 RS = 30k
10104509
www.ti.com 12
LM4050/LM4050Q
Functional Block Diagram
10104514
Applications Information
The LM4050 is a precision micro-power curvature-corrected
bandgap shunt voltage reference. For space critical applica-
tions, the LM4050 is available in the sub-miniature SOT-23
surface-mount package. The LM4050 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 LM4050 remains stable. Re-
ducing design effort is the availability of several fixed reverse
breakdown voltages: 2.048V, 2.500V, 4.096V, 5.000V,
8.192V, and 10.000V. The minimum operating current in-
creases from 60 μA for the LM4050-2.0 to 100 μA for the
LM4050-10.0. All versions have a maximum operating current
of 15 mA.
LM4050s in the SOT-23 packages have a parasitic Schottky
diode between pin 2 (−) and pin 3 (Die attach interface con-
tact). Therefore, pin 3 of the SOT-23 package must be left
floating or connected to pin 2.
The 4.096V version allows single +5V 12-bit ADCs or DACs
to operate with an LSB equal to 1 mV. For 12-bit ADCs or
DACs that operate on supplies of 10V or greater, the 8.192V
version gives 2 mV per LSB.
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 -40°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 LM4050. RS determines the current that flows
through the load (IL) and the LM4050 (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 LM4050 even when the supply voltage 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
LM4050 is less than 15 mA.
RS is determined by the supply voltage, (VS), the load and
operating current, (IL and IQ), and the LM4050's reverse
breakdown voltage, VR.
Typical Applications
10104515
FIGURE 1. Shunt Regulator
13 www.ti.com
LM4050/LM4050Q
10104516
**Ceramic monolithic
*Tantalum
FIGURE 2. LM4050-4.1's Nominal 4.096 breakdown voltage gives ADC12451 1 mV/LSB
www.ti.com 14
LM4050/LM4050Q
10104517
FIGURE 3. Bounded amplifier reduces saturation-induced delays and can prevent succeeding stage damage.
Nominal clamping voltage is ±11.5V (LM4050's reverse breakdown voltage +2 diode VF).
10104518
FIGURE 4. Protecting Op Amp input. The bounding voltage is ±4V with the LM4050-2.5
(LM4050's reverse breakdown voltage + 3 diode VF).
15 www.ti.com
LM4050/LM4050Q
10104519
FIGURE 5. Precision ±4.096V Reference
10104521
10104522
FIGURE 6. Precision 1 μA to 1 mA Current Sources
www.ti.com 16
LM4050/LM4050Q
Physical Dimensions inches (millimeters) unless otherwise noted
Plastic Surface Mount Package (M3)
NS Package Number MF03A
(JEDEC Registration TO-236AB)
17 www.ti.com
LM4050/LM4050Q
Notes
LM4050/LM4050Q Precision Micropower Shunt Voltage Reference
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