LM4050
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:
2.500V, 4.096V, 5.000V, 8.192V, and 10.000V. The minimum
operating current increases from 60 A for the LM4050-2.5
to 100 A 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 25C.
Bandgap reference temperature drift curvature correction
and low dynamic impedance ensure stable reverse break-
down voltage accuracy over a wide range of operating tem-
peratures and currents.
All grades and voltage options of the LM4050 are available
in both an industrial temperature range (-40C and +85C)
and an extended temperature range (-40C and +125C).
Features
n
Small packages: SOT-23
n
No output capacitor required
n
Tolerates capacitive loads
n
Fixed reverse breakdown voltages of 2.500V, 4.096V,
5.000V, 8.192V, and 10.000V
Key Specifications (LM4050-2.5)
j
Output voltage tolerance
(A grade, 25C)
0.1% (max)
j
Low output noise
(10 Hz to 10 kHz)
41 V
rms
(typ)
j
Wide operating current range
60 A to 15 mA
j
Industrial temperature range
-40C to +85C
j
Extended temperature range
-40C to +125C
j
Low temperature coefficient
50 ppm/C (max)
Applications
n
Portable, Battery-Powered Equipment
n
Data Acquisition Systems
n
Instrumentation
n
Process Control
n
Energy Management
n
Product Testing
n
Automotive
n
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
May 2002
LM4050
Precision
Micropower
Shunt
V
oltage
Reference
2002 National Semiconductor Corporation
DS101045
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Ordering Information
Industrial Temperature Range (-40C to +85C)
Reverse Breakdown
Voltage Tolerance at 25C and Average
Reverse Breakdown
Voltage Temperature Coefficient
LM4050 Supplied as 1000 Units,
Tape and Reel
LM4050 Supplied as 3000 Units,
Tape and Reel
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
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
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 (-40C to +125C)
Reverse Breakdown
Voltage Tolerance at 25C and Average
Reverse Breakdown
Voltage Temperature Coefficient
LM4050 Supplied as 1000 Units,
Tape and Reel
LM4050 Supplied as 3000 Units,
Tape and Reel
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
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
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
LM4050
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2
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
C = 2.500V Voltage Option
RGA
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:
RCC
AC = Initial Reverse Breakdown Voltage or Reference Voltage Tolerance
RDC
A =
0.1%, B =
0.2%, C = +0.5%,
REC
RFC
RGC
LM4050
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3
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Reverse Current
20 mA
Forward Current
10 mA
Power Dissipation (T
A
= 25C) (Note 2)
M3 Package
280 mW
Storage Temperature
-65C to +150C
Lead Temperature
M3 Package
Vapor phase (60 seconds)
+215C
Infrared (15 seconds)
+220C
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
(T
min
T
A
T
max
)
Industrial Temperature
Range
-40C
T
A
+85C
Extended temperature
Range
-40C
T
A
+125C
Reverse Current
LM4050-2.5
60 A to 15 mA
LM4050-4.1
68 A to 15 mA
LM4050-5.0
74 A to 15 mA
LM4050-8.2
91 A to 15 mA
LM4050-10.0
100 A to 15 mA
LM4050-2.5
Electrical Characteristics
Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
; all other limits T
A
= T
J
= 25C. 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
LM4050AEM3
Limits
(Note 5)
LM4050BIM3
LM4050BEM3
Limits
(Note 5)
LM4050CIM3
LM4050CEM3
Limits
(Note 5)
Units
(Limit)
V
R
Reverse Breakdown Voltage
I
R
= 100 A
2.500
V
Reverse Breakdown Voltage
Tolerance (Note 6)
I
R
= 100 A
2.5
5.0
13
mV (max)
Industrial Temp. Range
11
14
21
mV (max)
Extended Temp. Range
15
18
25
mV (max)
I
RMIN
Minimum Operating Current
41
A
60
60
60
A (max)
65
65
65
A (max)
V
R
/
T
Average Reverse Breakdown
Voltage Temperature Coefficient
(Note 6)
I
R
= 10 mA
20
ppm/C
I
R
= 1 mA
15
ppm/C
I
R
= 100 A
15
50
50
50
ppm/C (max)
V
R
/
I
R
Reverse Breakdown Voltage
Change with Operating Current
Change (Note 7)
I
RMIN
I
R
1 mA
0.3
mV
0.8
0.8
0.8
mV (max)
1.2
1.2
1.2
mV (max)
1 mA
I
R
15 mA
2.3
mV
6.0
6.0
6.0
mV (max)
8.0
8.0
8.0
mV (max)
Z
R
Reverse Dynamic Impedance
I
R
= 1 mA, f = 120 Hz, I
AC
= 0.1 I
R
0.3
e
N
Wideband Noise
I
R
= 100 A
41
V
rms
10 Hz
f 10 kHz
V
R
Reverse Breakdown Voltage
Long Term Stability
t = 1000 hrs
T = 25C
0.1C
I
R
= 100 A
120
ppm
V
HYST
Thermal Hysteresis
(Note 8)
T = -40C to 125C
0.7
mV
LM4050
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LM4050-4.1
Electrical Characteristics
Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
; all other limits T
A
= T
J
= 25C. 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
LM4050AEM3
Limits
(Note 5)
LM4050BIM3
LM4050BEM3
Limits
(Note 5)
LM4050CIM3
LM4050CEM3
Limits
(Note 5)
Units
(Limit)
V
R
Reverse Breakdown Voltage
I
R
= 100 A
4.096
V
Reverse Breakdown Voltage
Tolerance (Note 6)
I
R
= 100 A
4.1
8.2
21
mV (max)
Industrial Temp. Range
18
22
34
mV (max)
Extended Temp. Range
25
29
41
mV (max)
I
RMIN
Minimum Operating Current
52
A
68
68
68
A (max)
Industrial Temp. Range
73
73
73
A (max)
Extended Temp. Range
78
78
78
A (max)
V
R
/
T
Average Reverse Breakdown
Voltage Temperature Coefficient
(Note 6)
I
R
= 10 mA
30
ppm/C
I
R
= 1 mA
20
ppm/C
I
R
= 100 A
20
50
50
50
ppm/C (max)
V
R
/
I
R
Reverse Breakdown Voltage
Change with Operating Current
Change (Note 7)
I
RMIN
I
R
1 mA
0.2
mV
0.9
0.9
0.9
mV (max)
1.2
1.2
1.2
mV (max)
1 mA
I
R
15 mA
2.0
mV
7.0
7.0
7.0
mV (max)
10.0
10.0
10.0
mV (max)
Z
R
Reverse Dynamic Impedance
I
R
= 1 mA, f = 120 Hz,
0.5
I
AC
= 0.1 I
R
e
N
Wideband Noise
I
R
= 100 A
93
V
rms
10 Hz
f 10 kHz
V
R
Reverse Breakdown Voltage
Long Term Stability
t = 1000 hrs
T = 25C
0.1C
I
R
= 100 A
120
ppm
V
HYST
Thermal Hysteresis
(Note 8)
T = -40C to 125C
1.148
mV
LM4050-5.0
Electrical Characteristics
Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
; all other limits T
A
= T
J
= 25C. 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
LM4050AEM3
Limits
(Note 5)
LM4050BIM3
LM4050BEM3
Limits
(Note 5)
LM4050CIM3
LM4050CEM3
Limits
(Note 5)
Units
(Limit)
V
R
Reverse Breakdown Voltage
I
R
= 100 A
5.000
V
Reverse Breakdown Voltage
Tolerance (Note 6)
I
R
= 100 A
5.0
10
25
mV (max)
Industrial Temp. Range
22
27
42
mV (max)
Extended Temp. Range
30
35
50
mV (max)
I
RMIN
Minimum Operating Current
56
A
74
74
74
A (max)
Industrial Temp. Range
80
80
80
A (max)
Extended Temp. Range
90
90
90
A (max)
V
R
/
T
Average Reverse Breakdown
Voltage Temperature Coefficient
(Note 6)
I
R
= 10 mA
30
ppm/C
I
R
= 1 mA
20
ppm/C
I
R
= 100 A
20
50
50
50
ppm/C (max)
V
R
/
I
R
Reverse Breakdown Voltage
Change with Operating Current
Change (Note 7)
I
RMIN
I
R
1 mA
0.2
mV
1.0
1.0
1.0
mV (max)
1.4
1.4
1.4
mV (max)
1 mA
I
R
15 mA
2.0
mV
8.0
8.0
8.0
mV (max)
12.0
12.0
12.0
mV (max)
LM4050
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