LM4040/LM4041
Precision Micropower Shunt Voltage
Reference
General Description
Ideal for space critical applications, the LM4040 and
LM4041 precision voltage references are available in the
subminiature (3mm × 1.3mm) SOT-23 surface-mount
package.
The LM4040 is 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
breakdown voltage.
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 have bandgap reference
temperature drift curvature correction and low dynamic
impedance, ensuring stable reverse breakdown voltage
accuracy over a wide range of operating temperatures and
currents.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
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.
Applications
Battery-powered equipment
Data acquisition systems
Instrumentation
Process control
Energy management
Product testing
Automotive electronics
Precision audio components
Typical Application
LM4040, LM4041 Fixed Shunt
Regulator Application
LM4041 Adjustable Shunt
Regulator Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
June 24, 2014
Revision 3.0
Micrel, Inc.
LM4040/LM4041
Ordering Information
Part Number
LM4040CYM3-2.5
LM4040DYM3-2.5
LM4040CYM3-4.1
LM4040DYM3-4.1
LM4040CYM3-5.0
LM4040DYM3-5.0
LM4041CYM3-1.2
LM4041DYM3-1.2
LM4041CYM3-ADJ
LM4041DYM3-ADJ
Marking
Y2C
Y2D
Y4C
Y4D
Y5C
Y5D
Y1C
Y1D
YAC
YAD
Voltage
2.500V
2.500V
4.096V
4.096V
5.000V
5.000V
1.225V
1.225V
1.24V to 10V
1.24V to 10V
Accuracy, Temp. Coefficient
±0.5%, 100ppm/°C
±1.0%, 150ppm/°C
±0.5%, 100ppm/°C
±1.0%, 150ppm/°C
±0.5%, 100ppm/°C
±1.0%, 150ppm/°C
±0.5%, 100ppm/°C
±1.0%, 150ppm/°C
±0.5%, 100ppm/°C
±1.0%, 150ppm/°C
Package
3-Pin SOT-23
3-Pin SOT-23
3-Pin SOT-23
3-Pin SOT-23
3-Pin SOT-23
3-Pin SOT-23
3-Pin SOT-23
3-Pin SOT-23
3-Pin SOT-23
3-Pin SOT-23
Pin Configuration
SOT-23 (M3)
Fixed Version
SOT-23 (M3)
Adjustable Version
Pin Description
Pin Number
Fixed
1
-
2
3
Pin Number
Adjustable
2
1
3
-
Pin Name
+
FB
-
NC
Pin Function
Cathode, connect to positive voltage.
Feedback, connect to a resistive divider network to set the output voltage.
Anode, connect to negative voltage.
Not internally connected. This pin must be left floating or connected to – (Pin 2).
June 24, 2014
2
Revision 3.0
Micrel, Inc.
LM4040/LM4041
Absolute Maximum Ratings
(1)
Reverse Current .......................................................... 20mA
Forward Current .......................................................... 10mA
Maximum Output Voltage (LM4041-ADJ) ...................... 15V
Lead Temperature
Vapor phase (60s) ............................................... 215°C
Infrared (15s) ....................................................... 220°C
(3)
Power Dissipation (T
A
= 25°C) .............................. 306mW
Storage Temperature (Ts)......................... –65°C to +150°C
ESD Susceptibility
(4)
Human Body Model .............................................. 2kV
(4)
Machine Model .................................................... 200V
Operating Ratings
(2)
Operating Temperature Range (T
A
) ............ –40°C to +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
Thermal Resistance
3-Pin SOT-23 (Θ
JA
) .......................................... 326°C/W
LM4040-2.5 Electrical Characteristics
(5)
T
A
= Operating Temperature Range,
bold
values indicate T
A
= T
J
= –40°C to +85°C, unless noted.
Symbol
LM4040C
Reverse Breakdown Voltage
V
R
Reverse Breakdown Voltage
(6)
Tolerance
Minimum Operating Current
Average Reverse Breakdown
Voltage Temperature
Coefficient
I
R
= 10mA
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤ I
R
≤1mA
1mA ≤ I
R
≤ 15mA
I
R
= 1mA, f = 120Hz, I
AC
= 0.1I
R
I
R
= 100µA, 10Hz ≤ f ≤ 10kHz
t = 1000hrs., T = 25°C ±0.1°C, I
R
= 100µA
I
R
= 100µA
2.500
±12
±29
45
60
65
±20
±15
±15
0.3
0.8
1.0
2.5
6.0
8.0
0.3
35
120
0.9
±100
V
mV
mV
µA
µA
ppm/°C
ppm/°C
ppm/°C
mV
mV
mV
mV
Ω
µV
RMS
ppm
Parameter
Condition
Min.
Typ.
Max.
Units
I
RMIN
ΔV
R
/ΔT
ΔV
R
/ΔI
R
Reverse Breakdown Voltage
Change with Operating Current
Change
Reverse Dynamic Impedance
Wideband Noise
Reverse Breakdown Voltage
Long Term Stability
Z
R
e
N
ΔV
R
Notes:
1. Exceeding the absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating ratings.
3. The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
(maximum junction temperature), Ɵ
JA
(junction
to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PD
MAX
= (T
JMAX
–
T
A
)/ Ɵ
JA
or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4040 and LM4041, T
JMAX
= 125°C and the typical
thermal resistance, when board-mounted, is 326°C/W for the SOT-23 package.
4. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF. The machine model is a
200pF capacitor discharged directly into each pin.
5. Specification for packaged product only.
6. The boldface (overtemperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage
Tolerance ±[(ΔV
R
/ΔT)(65°C)(V
R
)]. ΔV
R
/ΔT is the V
R
temperature coefficient, 65°C is the temperature range from –40°C to the reference point of
25°C, and V
R
is the reverse breakdown voltage. The total overtemperature tolerance for the different grades follows:
a. C-grade: ±1.15% = ±0.5% ±100ppm/°C × 65°C
b. D-grade: ±1.98% = ±1.0% ±150ppm/°C × 65°C
Example: The C-grade LM4040-2.5 has an overtemperature Reverse Breakdown Voltage tolerance of ±2.5 × 1.15% = ±29mV.
June 24, 2014
3
Revision 3.0
Micrel, Inc.
LM4040/LM4041
LM4040-2.5 Electrical Characteristics
(5)
(Continued)
T
A
= Operating Temperature Range,
bold
values indicate T
A
= T
J
= –40°C to +85°C, unless noted.
Symbol
LM4040D
Reverse Breakdown Voltage
V
R
Reverse Breakdown Voltage
(6)
Tolerance
Minimum Operating Current
Average Reverse Breakdown
Voltage Temperature
Coefficient
I
R
= 10mA
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤ I
R
≤1mA
1mA ≤ I
R
≤ 15mA
I
R
= 1mA, f = 120Hz, I
AC
= 0.1I
R
I
R
= 100µA, 10Hz ≤ f ≤ 10kHz
t = 1000hrs., T = 25°C ±0.1°C, I
R
= 100µA
I
R
= 100µA
2.500
±25
±49
45
65
70
±20
±15
±15
0.3
1.0
1.2
2.5
8.0
10.0
0.3
35
120
1.1
±150
V
mV
mV
µA
µA
ppm/°C
ppm/°C
ppm/°C
mV
mV
mV
mV
Ω
µV
RMS
ppm
Parameter
Condition
Min.
Typ.
Max.
Units
I
RMIN
ΔV
R
/ΔT
ΔV
R
/ΔI
R
Reverse Breakdown Voltage
Change with Operating Current
Change
Reverse Dynamic Impedance
Wideband Noise
Reverse Breakdown Voltage
Long Term Stability
Z
R
e
N
ΔV
R
LM4040-4.1 Electrical Characteristics
(5)
T
A
= Operating Temperature Range,
bold
values indicate T
A
= T
J
= –40°C to +85°C, unless noted.
Symbol
LM4040C
Reverse Breakdown Voltage
V
R
Reverse Breakdown Voltage
(6)
Tolerance
Minimum Operating Current
Average Reverse Breakdown
Voltage Temperature
Coefficient
I
R
= 10mA
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤ I
R
≤1mA
1mA ≤ I
R
≤ 15mA
I
R
= 1mA, f = 120Hz, I
AC
= 0.1I
R
I
R
= 100µA, 10Hz ≤ f ≤ 10kHz
t = 1000hrs., T = 25°C ±0.1°C, I
R
= 100µA
I
R
= 100µA
4.096
±20
±47
50
68
73
±30
±20
±20
0.5
0.9
1.2
3.0
7.0
10.0
0.5
80
120
1.0
±100
V
mV
mV
µA
µA
ppm/°C
ppm/°C
ppm/°C
mV
mV
mV
mV
Ω
µV
RMS
ppm
Parameter
Condition
Min.
Typ.
Max.
Units
I
RMIN
ΔV
R
/ΔT
ΔV
R
/ΔI
R
Reverse Breakdown Voltage
Change with Operating Current
Change
Reverse Dynamic Impedance
Wideband Noise
Reverse Breakdown Voltage
Long Term Stability
Z
R
e
N
ΔV
R
June 24, 2014
4
Revision 3.0
Micrel, Inc.
LM4040/LM4041
LM4040-4.1 Electrical Characteristics
(5)
(Continued)
T
A
= Operating Temperature Range,
bold
values indicate T
A
= T
J
= –40°C to +85°C, unless noted.
Symbol
LM4040D
Reverse Breakdown Voltage
V
R
Reverse Breakdown Voltage
(6)
Tolerance
Minimum Operating Current
Average Reverse Breakdown
Voltage Temperature
Coefficient
I
R
= 10mA
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤ I
R
≤1mA
1mA ≤ I
R
≤ 15mA
I
R
= 1mA, f = 120Hz, I
AC
= 0.1I
R
I
R
= 100µA, 10Hz ≤ f ≤ 10kHz
t = 1000hrs., T = 25°C ±0.1°C, I
R
= 100µA
I
R
= 100µA
4.096
±41
±81
50
73
78
±30
±20
±20
0.5
1.2
1.5
3.0
9.0
13.0
0.5
80
120
1.3
±150
V
mV
mV
µA
µA
ppm/°C
ppm/°C
ppm/°C
mV
mV
mV
mV
Ω
µV
RMS
ppm
Parameter
Condition
Min.
Typ.
Max.
Units
I
RMIN
ΔV
R
/ΔT
ΔV
R
/ΔI
R
Reverse Breakdown Voltage
Change with Operating Current
Change
Reverse Dynamic Impedance
Wideband Noise
Reverse Breakdown Voltage
Long Term Stability
Z
R
e
N
ΔV
R
LM4040-5.0 Electrical Characteristics
(5)
T
A
= Operating Temperature Range,
bold
values indicate T
A
= T
J
= –40°C to +85°C, unless noted.
Symbol
LM4040C
Reverse Breakdown Voltage
V
R
Reverse Breakdown Voltage
(6)
Tolerance
Minimum Operating Current
Average Reverse Breakdown
Voltage Temperature
Coefficient
I
R
= 10mA
I
R
= 1mA
I
R
= 100µA
I
RMIN
≤ I
R
≤1mA
1mA ≤ I
R
≤ 15mA
I
R
= 1mA, f = 120Hz, I
AC
= 0.1I
R
I
R
= 100µA, 10Hz ≤ f ≤ 10kHz
t = 1000hrs., T = 25°C ±0.1°C, I
R
= 100µA
I
R
= 100µA
5.000
±25
±58
54
74
80
±30
±20
±20
0.5
1.0
1.4
3.5
8.0
12.0
0.5
80
120
1.1
±100
V
mV
mV
µA
µA
ppm/°C
ppm/°C
ppm/°C
mV
mV
mV
mV
Ω
µV
RMS
ppm
Parameter
Condition
Min.
Typ.
Max.
Units
I
RMIN
ΔV
R
/ΔT
ΔV
R
/ΔI
R
Reverse Breakdown Voltage
Change with Operating Current
Change
Reverse Dynamic Impedance
Wideband Noise
Reverse Breakdown Voltage
Long Term Stability
Z
R
e
N
ΔV
R
June 24, 2014
5
Revision 3.0
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