LM4040
Precision Micropower Shunt Voltage Reference
General Description
Ideal for space critical applications, the LM4040 precision
voltage reference is available in the sub-miniature SC70 and
SOT-23 surface-mount package. The LM4040's advanced
design eliminates the need for an external stabilizing capaci-
tor while ensuring stability with any capacitive load, thus
making the LM4040 easy to use. Further reducing design
effort is the availability of several fixed reverse breakdown
voltages: 2.048V, 2.500V, 3.000V, 4.096V, 5.000V, 8.192V,
and 10.000V. The minimum operating current increases from
60 A for the LM4040-2.5 to 100 A for the LM4040-10.0. All
versions have a maximum operating current of 15 mA.
The LM4040 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.
Also available is the LM4041 with two reverse breakdown
voltage versions: adjustable and 1.2V. Please see the
LM4041 data sheet.
Features
n
Small packages: SOT-23, TO-92 and SC70
n
No output capacitor required
n
Tolerates capacitive loads
n
Fixed reverse breakdown voltages of 2.048V,
2.500V,3.000V, 4.096V, 5.000V, 8.192V, and 10.000V
Key Specifications (LM4040-2.5)
j
Output voltage tolerance
(A grade, 25C)
0.1% (max)
j
Low output noise
(10 Hz to 10 kHz)
35 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
100 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
SOT-23
TO-92
SC70
01132301
*This pin must be left floating or connected to
pin 2.
Top View
See NS Package Number MF03A
(JEDEC Registration TO-236AB)
01132303
Bottom View
See NS Package Number Z03A
01132330
*This pin must be left floating or connected to pin
1.
Top View
See NS Package Number MAA05A
August 2002
LM4040
Precision
Micropower
Shunt
V
oltage
Reference
2002 National Semiconductor Corporation
DS011323
www.national.com
Extended Temperature Range (-40 C to +125C)
Reverse Breakdown
Voltage Tolerance at 25 C
and Average Reverse Breakdown
Voltage Temperature Coefficient
Package
M3 (SOT-23)
See NS Package
Number MF03A
0.5%, 100 ppm/C max (C grade)
LM4040CEM3-2.0, LM4040CEM3-2.5,
LM4040CEM3-3.0, LM4040CEM3-5.0
1.0%, 150 ppm/C max (D grade)
LM4040DEM3-2.0, LM4040DEM3-2.5,
LM4040DEM3-3.0, LM4040DEM3-5.0
2.0%, 150 ppm/C max (E grade)
LM4040EEM3-2.0, LM4040EEM3-2.5,
LM4040EEM3-3.0
LM4040
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3
SOT-23 AND SC70 Package Marking Information
Only three fields of marking are possible on the SOT-23's and SC70's small surface. This table gives the meaning of the three
fields.
Part Marking
Field Definition
RJA SOT-23 only
First Field:
R2A SOT-23 only
RKA SOT-23 only
R4A SOT-23 only
R = Reference
R5A SOT-23 only
Second Field:
J = 2.048V Voltage Option
2 = 2.500V Voltage Option
R8A SOT-23 only
K = 3.000V Voltage Option
R0A SOT-23 only
4 = 4.096V Voltage Option
RJB
R2B
5 = 5.000V Voltage Option
RKB
R4B
8= 8.192V Voltage Option
R5B
0 = 10.000V Voltage Option
R8B SOT-23 only
R0B SOT-23 only
Third Field:
RJC
R2C
AE = Initial Reverse Breakdown Voltage or Reference Voltage Tolerance
RKC
R4C
A =
0.1%, B =
0.2%, C = +0.5%, D =
1.0%, E =
2.0%
R5C
R8C SOT-23 only
R0C SOT-23 only
RJD
R2D
RKD
R4D
R5D
R8D SOT-23 only
R0D SOT-23 only
RJE
R2E
RKE
LM4040
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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
306 mW
Z Package
550 mW
M7 Package
241 mW
Storage Temperature
-65C to +150C
Lead Temperature
M3 Package
Vapor phase (60 seconds)
+215C
Infrared (15 seconds)
+220C
Z Package
Soldering (10 seconds)
+260C
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
(Notes 1, 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
LM4040-2.0
60 A to 15 mA
LM4040-2.5
60 A to 15 mA
LM4040-3.0
62 A to 15 mA
LM4040-4.1
68 A to 15 mA
LM4040-5.0
74 A to 15 mA
LM4040-8.2
91 A to 15 mA
LM4040-10.0
100 A to 15 mA
LM4040-2.0
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 and B designate initial Re-
verse Breakdown Voltage tolerances of
0.1% and
0.2%, respectively.
Symbol
Parameter
Conditions
Typical
(Note 4)
LM4040AIM3
LM4040AIZ
(Limit)
(Note 5)
LM4040BIM3
LM4040BIZ
LM4040BIM7
(Limit)
(Note 5)
Units
(Limit)
V
R
Reverse Breakdown Voltage
I
R
= 100 A
2.048
V
Reverse Breakdown Voltage
Tolerance
(Note 6)
I
R
= 100 A
2.0
4.1
mV (max)
15
17
mV (max)
I
RMIN
Minimum Operating Current
45
A
60
60
A (max)
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
100
100
ppm/C (max)
I
R
= 100 A
15
ppm/C
V
R
/
I
R
Reverse Breakdown Voltage
Change with Operating
Current Change (Note *NO
TARGET FOR FNXref
NS4914*)
I
RMIN
I
R
1 mA
0.3
mV
0.8
0.8
mV (max)
1.0
1.0
mV (max)
1 mA
I
R
15 mA
2.5
mV
6.0
6.0
mV (max)
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
0.8
0.8
(max)
e
N
Wideband Noise
I
R
= 100 A
35
V
rms
10 Hz
f 10 kHz
LM4040
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