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) SSOT-23 surface-mount package. The LM4050's
design eliminates the need for an external stabilizing capaci-
tor while ensuring stability with any capacitive load, thus
making the LM4050 easy to use. Further reducing design ef-
fort is the availability of several fixed reverse breakdown volt-
ages: 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 operate be-
tween -40C and +85C. Selected parts can operate in the
extended temperature range, from -40C and +125C.
Features
n
Small packages: SSOT-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)
n
Output voltage tolerance
(A grade, 25C)
0.1% (max)
n
Low output noise
(10 Hz to 10 kHz)
41 V
rms
(typ)
n
Wide operating current range
60 A to 15 mA
n
Industrial temperature range
-40C to +85C
n
Extended temperature range
-40C to +125C
n
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 Diagrams
SSOT-23
DS101045-1
*This pin must be left floating or connected to pin 2.
Top View
See NS Package Number MF03A
May 2000
LM4050
Precision
Micropower
Shunt
V
oltage
Reference
2000 National Semiconductor Corporation
DS101045
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Ordering Information
Industrial Temperature Range (-40 C to +85 C)
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 (-40 C to +125 C)
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
0.5%, 50 ppm/C max (C grade)
LM4050CEM3-2.5
LM4050CEM3X-2.5
SSOT-23 Package Marking Information
Only three fields of marking are possible on the SSOT-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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2
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 3)
M3 Package
280 mW
Storage Temperature (Note 2)
-65C to +150C
Lead Temperature
M3 Package
Vapor phase (60 seconds)
+215C
Infrared (15 seconds)
+220C
ESD Susceptibility
Human Body Model (Note 4)
2 kV
Machine Model (Note 4)
200V
See AN-450 "Surface Mounting Methods and Their Effect
on Product Reliability" for other methods of soldering
surface mount devices.
Operating Ratings
(Notes 1, 3)
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 Re-
verse Breakdown Voltage tolerances of
0.1%,
0.2%, and 0.5% respectively.
Symbol
Parameter
Conditions
Typical
(Note 5)
LM4050AIM3
Limits
(Note 6)
LM4050BIM3
Limits
(Note 6)
LM4050CIM3
LM4050CEM3
Limits
(Note 6)
Units
(Limit)
V
R
Reverse Breakdown
Voltage
I
R
= 100 A
2.500
V
Reverse Breakdown
Voltage Tolerance (Note 7)
I
R
= 100 A
2.5
5.0
13
mV (max)
Industrial Temp. Range
Devices
11
14
21
mV (max)
Extended Temp. Range
Devices
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 7)
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 8)
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
Output Hysteresis
T = -40C to 125C
0.7
mV
LM4050
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LM4050-4.1
Electrical Characteristics (Industrial Temperature Range)
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 Re-
verse Breakdown Voltage tolerances of
0.1%,
0.2%, and 0.5% respectively.
Symbol
Parameter
Conditions
Typical
(Note 5)
Units
(Limit)
LM4050AIM3 LM4050BIM3 LM4050CIM3
Limits
Limits
Limits
(Note 6)
(Note 6)
(Note 6)
V
R
Reverse Breakdown
Voltage
I
R
= 100 A
4.096
V
Reverse Breakdown
Voltage Tolerance (Note 7)
I
R
= 100 A
4.1
8.2
21
mV (max)
18
22
34
mV (max)
I
RMIN
Minimum Operating Current
52
A
68
68
68
A (max)
73
73
73
A (max)
V
R
/
T Average Reverse
Breakdown Voltage
Temperature
Coefficient(Note 7)
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 8)
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
Output Hysteresis
T = -40C to 125C
1.148
mV
LM4050
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4
LM4050-5.0
Electrical Characteristics (Industrial Temperature Range)
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 Re-
verse Breakdown Voltage tolerances of
0.1%,
0.2% and 0.5% respectively.
Symbol
Parameter
Conditions
Typical
(Note 5)
Units
(Limit)
LM4050AIM3 LM4050BIM3 LM4050CIM3
Limits
Limits
Limits
(Note 6)
(Note 6)
(Note 6)
V
R
Reverse Breakdown
Voltage
I
R
= 100 A
5.000
V
Reverse Breakdown
Voltage Tolerance (Note 7)
I
R
= 100 A
5.0
10
25
mV (max)
22
27
42
mV (max)
I
RMIN
Minimum Operating Current
56
A
74
74
74
A (max)
80
80
80
A (max)
V
R
/
T Average Reverse
Breakdown Voltage
Temperature Coefficient
(Note 7)
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 8)
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)
Z
R
Reverse Dynamic
Impedance
I
R
= 1 mA, f = 120 Hz,
0.5
I
AC
= 0.1 I
R
(max)
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
120
ppm
I
R
= 100 A
V
HYST
Output Hysteresis
T = -40C to 125C
1.4
mV
LM4050
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