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LM4050 Precision Micropower Shunt Voltage Reference
July 2004
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:
2.048V, 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 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 (−40˚C and +85˚C)
and an extended temperature range (−40˚C and +125˚C).
n
Tolerates capacitive loads
n
Fixed reverse breakdown voltages of 2.048V, 2.500V,
4.096V, 5.000V, 8.192V, and 10.000V
Key Specifications (LM4050-2.5)
j
Output voltage tolerance
(A grade, 25˚C)
j
Low output noise
±
0.1% (max)
41 µV
rms
(typ)
60 µA to 15 mA
−40˚C to +85˚C
−40˚C to +125˚C
50 ppm/˚C (max)
(10 Hz to 10 kHz)
j
Wide operating current range
j
Industrial temperature range
j
Extended temperature range
j
Low temperature coefficient
Applications
n
n
n
n
n
n
n
n
Portable, Battery-Powered Equipment
Data Acquisition Systems
Instrumentation
Process Control
Energy Management
Product Testing
Automotive
Precision Audio Components
Features
n
Small packages: SOT-23
n
No output capacitor required
Connection Diagram
SOT-23
10104501
*This pin must be left floating or connected to pin 2.
Top View
See NS Package Number MF03A
© 2004 National Semiconductor Corporation
DS101045
www.national.com
LM4050
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
LM4050AIM3-2.0
LM4050AIM3-2.5
LM4050AIM3-4.1
LM4050 Supplied as 3000 Units,
Tape and Reel
LM4050AIM3X-2.0
LM4050AIM3X-2.5
LM4050AIM3X-4.1
LM4050AIM3X-5.0
LM4050AIM3X-8.2
LM4050AIM3X-10
LM4050BIM3X-2.0
LM4050BIM3X-2.5
LM4050BIM3X-4.1
LM4050BIM3X-5.0
LM4050BIM3X-8.2
LM4050BIM3X-10
LM4050CIM3X-2.0
LM4050CIM3X-2.5
LM4050CIM3X-4.1
LM4050CIM3X-5.0
LM4050CIM3X-8.2
LM4050CIM3X-10
±
0.1%, 50 ppm/˚C max (A grade)
LM4050AIM3-5.0
LM4050AIM3-8.2
LM4050AIM3-10
LM4050BIM3-2.0
LM4050BIM3-2.5
LM4050BIM3-4.1
±
0.2%, 50 ppm/˚C max (B grade)
LM4050BIM3-5.0
LM4050BIM3-8.2
LM4050BIM3-10
LM4050CIM3-2.0
LM4050CIM3-2.5
LM4050CIM3-4.1
±
0.5%, 50 ppm/˚C max (C grade)
LM4050CIM3-5.0
LM4050CIM3-8.2
LM4050CIM3-10
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
LM4050AEM3-2.0
LM4050AEM3-2.5
LM4050AEM3-4.1
LM4050 Supplied as 3000 Units,
Tape and Reel
LM4050AEM3X-2.0
LM4050AEM3X-2.5
LM4050AEM3X-4.1
LM4050AEM3X-5.0
LM4050AEM3X-8.2
LM4050AEM3X-10
LM4050BEM3X-2.0
LM4050BEM3X-2.5
LM4050BEM3X-4.1
LM4050BEM3X-5.0
LM4050BEM3X-8.2
LM4050BEM3X-10
LM4050CEM3X-2.0
LM4050CEM3X-2.5
LM4050CEM3X-4.1
LM4050CEM3X-5.0
LM4050CEM3X-8.2
LM4050CEM3X-10
±
0.1%, 50 ppm/˚C max (A grade)
LM4050AEM3-5.0
LM4050AEM3-8.2
LM4050AEM3-10
LM4050BEM3-2.0
LM4050BEM3-2.5
LM4050BEM3-4.1
±
0.2%, 50 ppm/˚C max (B grade)
LM4050BEM3-5.0
LM4050BEM3-8.2
LM4050BEM3-10
LM4050CEM3-2.0
LM4050CEM3-2.5
LM4050CEM3-4.1
±
0.5%, 50 ppm/˚C max (C grade)
LM4050CEM3-5.0
LM4050CEM3-8.2
LM4050CEM3-10
www.national.com
2
LM4050
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
RCA
RDA
REA
RFA
RGA
RNA
RCB
RDB
REB
RFB
RGB
RNB
RCC
RDC
REC
RFC
RGC
RNC
A–C = Initial Reverse Breakdown Voltage or Reference Voltage Tolerance
A =
±
0.1%, B =
±
0.2%, C = +0.5%,
Third Field:
First Field:
R = Reference
Second Field:
N = 2.048V Voltage Option
C = 2.500V Voltage Option
D = 4.096V Voltage Option
E = 5.000V Voltage Option
F = 8.192V Voltage Option
G = 10.000V Voltage Option
Field Definition
3
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LM4050
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
Forward Current
Power Dissipation (T
A
= 25˚C) (Note 2)
M3 Package
Storage Temperature
Lead Temperature
M3 Package
Vapor phase (60 seconds)
Infrared (15 seconds)
ESD Susceptibility
Human Body Model (Note 3)
Machine Model (Note 3)
2 kV
200V
+215˚C
+220˚C
280 mW
−65˚C to +150˚C
20 mA
10 mA
Operating Ratings
(Note 2)
Temperature Range
Industrial Temperature
Range
Extended temperature
Range
Reverse Current
LM4050-2.0
LM4050-2.5
LM4050-4.1
LM4050-5.0
LM4050-8.2
LM4050-10.0
60 µA to 15 mA
60 µA to 15 mA
68 µA to 15 mA
74 µA to 15 mA
91 µA to 15 mA
100 µA to 15 mA
(T
min
≤
T
A
≤
T
max
)
−40˚C
≤
T
A
≤
+85˚C
−40˚C
≤
T
A
≤
+125˚C
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
LM4050-2.0
Electrical Characteristics
Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
;
all other limits T
A
= T
J
= 25˚C. The grades A, B and C designate initial
Reverse Breakdown Voltage tolerances of
±
0.1%,
±
0.2%, and 0.5% respectively.
Symbol
V
R
Parameter
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance (Note 6)
Conditions
I
R
= 100 µA
I
R
= 100 µA
Industrial Temp. Range
Extended Temp. Range
I
RMIN
Minimum Operating Current
41
60
65
∆V
R
/∆T
Average Reverse Breakdown
Voltage Temperature
Coefficient (Note 6)
Reverse Breakdown Voltage
Change with Operating Current
Change (Note 7)
I
R
= 10 mA
I
R
= 1 mA
I
R
= 100 µA
∆V
R
/∆I
R
I
RMIN
≤
I
R
≤
1 mA
60
65
60
65
Typical
(Note 4)
2.048
LM4050AIM3
LM4050AEM3
Limits
(Note 5)
LM4050BIM3
LM4050BEM3
Limits
(Note 5)
LM4050CIM3
LM4050CEM3
Limits
(Note 5)
Units
(Limit)
V
±
2.048
±
9.0112
±
12.288
±
4.096
±
11.4688
±
14.7456
±
10.24
±
14.7456
±
17.2032
mV (max)
mV (max)
mV (max)
µA
µA (max)
µA (max)
ppm/˚C
ppm/˚C
±
20
±
15
±
15
0.3
0.8
1.2
0.8
1.2
6.0
8.0
0.8
1.2
6.0
8.0
±
50
±
50
±
50
ppm/˚C (max)
mV
mV (max)
mV (max)
mV
mV (max)
mV (max)
Ω
µV
rms
1 mA
≤
I
R
≤
15 mA
2.3
6.0
8.0
Z
R
e
N
∆V
R
Reverse Dynamic Impedance
Wideband Noise
Reverse Breakdown Voltage
Long Term Stability
Thermal Hysteresis
(Note 8)
I
R
= 1 mA, f = 120 Hz, I
AC
= 0.1 I
R
I
R
= 100 µA
10 Hz
≤
f
≤
10 kHz
t = 1000 hrs
T = 25˚C
±
0.1˚C
I
R
= 100 µA
∆T
= −40˚C to 125˚C
0.3
34
120
0.7
ppm
mV
V
HYST
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