LM4040/4041
Micrel
LM4040/4041
Precision Micropower Shunt Voltage Reference
General Description
Ideal for space critical applications, the LM4040 and LM4041
precision voltage references are available in the subminia-
ture (3mm
×
1.3mm) SOT-23 surface-mount package.
The LM4040 is the available in fixed reverse breakdown
voltages of 2.500V, 4.096V and 5.000V. The LM4041 is
available with a fixed 1.225V or an adjustable reverse break-
down voltage.
The LM4040 and LM4041’s advanced design eliminates the
need for an external stabilizing capacitor while ensuring
stability with any capacitive load, making them easy to use.
The minimum operating current ranges from 60µA for the
LM4041-1.2 to 74µA for the LM4040-5.0. LM4040 versions
have a maximum operating current of 15mA. LM4041
versions have a maximum operating current of 12mA.
The LM4040 and LM4041 utilizes zener-zap reverse break-
down 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 correc-
tion and low dynamic impedance ensure stable reverse
breakdown voltage accuracy over a wide range of operating
temperatures and currents.
Features
Small SOT-23 package
No output capacitor required
Tolerates capacitive loads
Fixed reverse breakdown voltages of 1.225, 2.500V,
4.096V and 5.000V
• Adjustable reverse breakdown version
• Contact Micrel for parts with extended temperature
range.
•
•
•
•
Key Specifications
• Output voltage tolerance (A grade, 25°C) ..
±0.1%
(max)
• Low output noise (10Hz to 100Hz)
LM4040 ................................................ 35µV
RMS
(typ)
LM4041 ................................................ 20µV
RMS
(typ)
• Wide operating current range
LM4040 ................................................ 60µA to 15mA
LM4041 ................................................ 60µA to 12mA
• Industrial temperature range .................. –40°C to +85°C
• Low temperature coefficient ................ 100ppm/°C (max)
Applications
•
•
•
•
•
•
•
•
Battery-Powered Equipment
Data Acquisition Systems
Instrumentation
Process Control
Energy Management
Product Testing
Automotive Electronics
Precision Audio Components
Typical Applications
V
S
V
S
R
S
V
R
LM4040
LM4041
I
Q
+ I
L
I
L
I
Q
R
S
V
R
V
O
V
O
R
1
V
O
= 1.233 (R
2
/R
1
+ 1)
LM4041
Adjustable
R
2
Figure 1. LM4040, LM4041 Fixed
Shunt Regulator Application
Figure 2. LM4041 Adjustable
Shunt Regulator Application
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
January 2000
1
LM4040/4041
LM4040/4041
Micrel
Pin Configuration
+
–
1
3
FB
+
1
3–
2
2
Pin 3 must float or
be connected to pin 2.
Fixed Version
SOT-23 (M3) Package
Top View
Adjustable Version
SOT-23 (M3) Package
Top View
Ordering Information
Part Number *
LM4040AIM3-2.5
LM4040BIM3-2.5
LM4040CIM3-2.5
LM4040DIM3-2.5
LM4040AIM3-4.1
LM4040BIM3-4.1
LM4040CIM3-4.1
LM4040DIM3-4.1
LM4040AIM3-5.0
LM4040BIM3-5.0
LM4040CIM3-5.0
LM4040DIM3-5.0
Voltage
2.500V
2.500V
2.500V
2.500V
4.096V
4.096V
4.096V
4.096V
5.000V
5.000V
5.000V
5.000V
Accuracy,
Temp. Coefficient
±0.1%,
100ppm/°C
±0.2%,
100ppm/°C
±0.5%,
100ppm/°C
±1.0%,
150ppm/°C
±0.1%,
100ppm/°C
±0.2%,
100ppm/°C
±0.5%,
100ppm/°C
±1.0%,
150ppm/°C
±0.1%,
100ppm/°C
±0.2%,
100ppm/°C
±0.5%,
100ppm/°C
±1.0%,
150ppm/°C
Part Number *
LM4041AIM3-1.2
LM4041BIM3-1.2
LM4041CIM3-1.2
LM4041DIM3-1.2
LM4041CIM3-ADJ
LM4041DIM3-ADJ
Voltage
1.225V
1.225V
1.225V
1.225V
1.24V to 10V
1.24V to 10V
Accuracy,
Temp. Coefficient
±0.1%,
100ppm/°C
±0.2%,
100ppm/°C
±0.5%,
100ppm/°C
±1.0%,
150ppm/°C
±0.5%,
100ppm/°C
±1.0%,
150ppm/°C
SOT-23 Package Markings
Example
R__
Field
1st Character
Code
R = Reference
Example
_2_
Field
Code
Example
__A
Field
3rd Character
Code
A =
±0.1%
B =
±0.2%
C =
±0.5%
D =
±1.0%
2nd Character 1 = 1.225V
2 = 2.500V
4 = 4.096V
5 = 5.000V
A = Adjustable
Example:
R2C represents
Reference, 2.500V,
±
0.5%
(LM4040CIM3-2.5)
Note:
If 3rd character is omitted, container will
indicate tolerance.
LM4040/4041
2
January 2000
LM4040/4041
Micrel
Functional Diagram
LM4040, LM4041 Fixed
Functional Diagram
LM4041 Adjustable
+
+
V
REF
FB
Absolute Maximum Ratings
Reverse Current ......................................................... 20mA
Forward Current ......................................................... 10mA
Maximum Output Voltage
LM4041-Adjustable ................................................... 15V
Power Dissipation at T
A
= 25°C (Note 2) ................ 306mW
Storage Temperature ............................... –65°C to +150°C
Lead Temperature
Vapor phase (60 seconds) .............................. +215°C
Infrared (15 seconds) ...................................... +220°C
ESD Susceptibility
Human Body Model (Note 3) ................................. 2kV
Machine Model (Note 3) ...................................... 200V
Operating Ratings
(Notes 1 and 2)
Temperature Range
(T
MIN
≤
T
A
≤
T
MAX
) .......................... –40°C
≤
T
A
≤
+85°C
Reverse Current
LM4040-2.5 .......................................... 60µA to 15mA
LM4040-4.1 .......................................... 68µA to 15mA
LM4040-5.0 .......................................... 74µA to 15mA
LM4041-1.2 .......................................... 60µA to 12mA
LM4041-ADJ ........................................ 60µA to 12mA
Output Voltage Range
LM4041-ADJ .......................................... 1.24V to 10V
January 2000
3
LM4040/4041
LM4040/4041
Micrel
LM4040-2.5 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, C, and D designate initial Reverse
Breakdown Voltage tolerance of
±0.1%, ±0.2%, ±0.5%,
and
±1.0
respectively.
LM4040AIM3 LM4040BIM3 LM4040CIM3
Symbol
Parameter
Conditions
Typical
(Note 4)
2.500
±2.5
±
19
45
60
65
Average Reverse Breakdown
Voltage Temperature
Coefficient
Reverse Breakdown Voltage
Change with Operating
Current Change
I
R
= 10mA
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤
I
R
1mA
20
15
15
0.3
0.8
1.0
2.5
0.6
8.0
0.3
0.8
35
120
0.8
0.9
0.6
8.0
0.6
8.0
0.8
1.0
0.8
1.0
100
60
65
100
60
65
100
±5.0
±
21
±12
±
29
Limits
(Note 5)
Limits
(Note 5)
Limits
(Note 5)
Units
(Limit)
V
mV (max)
mV (max)
µA
µA
(max)
µA
(max)
ppm/°C
ppm/°C (max)
ppm/°C (max)
mV
mV (max)
mV (max)
mV
mV (max)
mV (max)
Ω
Ω
(max)
µV
RMS
ppm
V
R
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance
I
R
= 100µA
I
R
= 100µA
I
RMIN
Minimum Operating Current
∆V
R
/∆T
∆V
R
/∆I
R
1mA
≤
I
R
15mA
Z
R
e
N
∆V
R
Reverse Dynamic Impedance
Wideband Noise
Reverse Breakdown Voltage
Long Term Stability
I
R
= 1mA, f = 120Hz
I
AC
= 0.1 I
R
I
R
= 100µA
10Hz
≤
f
≤
10kHz
t = 1000hrs
T = 25°C
±0.1°C
I
R
= 100µA
LM4040DIM3
Symbol
Parameter
Conditions
Typical
(Note 4)
2.500
±25
±
49
45
65
70
Average Reverse Breakdown
Voltage Temperature
Coefficient
Reverse Breakdown Voltage
Change with Operating
Current Change
I
R
= 10mA
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤
I
R
1mA
20
15
15
0.3
1.0
1.2
2.5
8.0
10.0
0.3
1.1
35
120
150
Limits
(Note 5)
Units
(Limit)
V
mV (max)
mV (max)
µA
µA
(max)
µA
(max)
ppm/°C
ppm/°C (max)
ppm/°C (max)
mV
mV (max)
mV (max)
mV
mV (max)
mV (max)
Ω
Ω
(max)
µV
RMS
ppm
V
R
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance
I
R
= 100µA
I
R
= 100µA
I
RMIN
Minimum Operating Current
∆V
R
/∆T
∆V
R
/∆I
R
1mA
≤
I
R
15mA
Z
R
e
N
∆V
R
Reverse Dynamic Impedance
Wideband Noise
Reverse Breakdown Voltage
Long Term Stability
I
R
= 1mA, f = 120Hz
I
AC
= 0.1 I
R
I
R
= 100µA
10Hz
≤
f
≤
10kHz
t = 1000hrs
T = 25°C
±0.1°C
I
R
= 100µA
LM4040/4041
4
January 2000
LM4040/4041
Micrel
LM4040-4.1 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, C, and D designate initial Reverse
Breakdown Voltage tolerance of
±0.1%, ±0.2%, ±0.5%,
and
±
1.0% respectively.
LM4040AIM3
Symbol
Parameter
Conditions
Typical
(Note 4)
4.096
±4.1
±
31
50
68
73
Average Reverse Breakdown
Voltage Temperature
Coefficient
Reverse Breakdown Voltage
Change with Operating
Current Change
I
R
= 10mA
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤
I
R
1mA
30
20
20
0.5
0.9
1.2
3.5
7.0
10.0
0.5
1.0
80
120
1.0
7.0
10.0
0.9
1.2
100
68
73
100
±8.2
±
35
Limits
(Note 5)
LM4040BIM3
Limits
(Note 5)
Units
(Limit)
V
mV (max)
mV (max)
µA
µA
(max)
µA
(max)
ppm/°C
ppm/°C (max)
ppm/°C (max)
mV
mV (max)
mV (max)
mV
mV (max)
mV (max)
Ω
Ω
(max)
µV
RMS
ppm
V
R
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance
I
R
= 100µA
I
R
= 100µA
I
RMIN
Minimum Operating Current
∆V
R
/∆T
∆V
R
/∆I
R
1mA
≤
I
R
15mA
Z
R
e
N
∆V
R
Reverse Dynamic Impedance
Wideband Noise
Reverse Breakdown Voltage
Long Term Stability
I
R
= 1mA, f = 120Hz
I
AC
= 0.1 I
R
I
R
= 100µA
10Hz
≤
f
≤
10kHz
t = 1000hrs
T = 25°C
±0.1°C
I
R
= 100µA
LM4040CIM3
Symbol
Parameter
Conditions
Typical
(Note 4)
4.096
±20
±
47
50
68
73
Average Reverse Breakdown
Voltage Temperature
Coefficient
Reverse Breakdown Voltage
Change with Operating
Current Change
I
R
= 10mA
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤
I
R
1mA
30
20
20
0.5
0.9
1.2
3.0
7.0
10.0
0.5
1.0
80
120
100
Limits
(Note 5)
LM4040DIM3
Limits
(Note 5)
±41
±
81
73
78
150
Units
(Limits)
V
mV (max)
mV (max)
µA
µA
(max)
µA
(max)
ppm/°C
ppm/°C (max)
ppm/°C (max)
mV
mV (max)
mV (max)
mV
mV (max)
mV (max)
Ω
Ω
(max)
µV
RMS
ppm
V
R
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Tolerance
I
R
= 100µA
I
R
= 100µA
I
RMIN
Minimum Operating Current
∆V
R
/∆T
∆V
R
/∆I
R
1.2
1.5
9.0
13.0
1.3
1mA
≤
I
R
15mA
Z
R
e
N
∆V
R
Reverse Dynamic Impedance
Wideband Noise
Reverse Breakdown Voltage
Long Term Stability
I
R
= 1mA, f = 120Hz
I
AC
= 0.1 I
R
I
R
= 100µA
10Hz
≤
f
≤
10kHz
t = 1000hrs
T = 25°C
±0.1°C
I
R
= 100µA
January 2000
5
LM4040/4041
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