Ideal for space critical applications, the LM4040 and
LM4041 precision voltage references are available in
the subminiature 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 60
μA
for
the LM4041-1.2 to 74
μA
for the LM4040-5.0. LM4040
versions have a maximum operating current of 15 mA.
LM4041 versions have a maximum operating current of
12 mA.
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.
Applications
•
•
•
•
•
•
•
•
Battery-Powered Equipment
Data Acquisition Systems
Instrumentation
Process Control
Energy Management
Product Testing
Automotive Electronics
Precision Audio Components
Package Types
LM4040/LM4041 (F
IXED
V
ERSION
)
3-Pin SOT-23
LM4041 (A
DJUSTABLE
V
ERSION
)
3-Pin SOT-23
NC
3
-
3
1
+
2
-
1
FB
2
+
2017-2018 Microchip Technology Inc.
DS20005757B-page 1
LM4040/LM4041
Typical Application Diagrams
LM4040/LM4041 Fixed Shunt
Regulator Application
LM4041 Adjustable Shunt
Regulator Application
V
S
R
S
V
S
R
S
V
R
LM4040
I
Q
+ I
L
I
L
I
Q
V
O
LM4041
Adjustable
V
O
R
1
V
O
= 1.233 (R
2
/R
1
+ 1)
R
2
Functional Block Diagrams
LM4040/LM4041 Fixed
LM4041 Adjustable
+
+
V
REF
FB
DS20005757B-page 2
2017-2018 Microchip Technology Inc.
LM4040/LM4041
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Reverse Current......................................................................................................................................................20 mA
Forward Current ......................................................................................................................................................10 mA
Maximum Output Voltage (LM4041-ADJ) ...................................................................................................................15V
Reverse Current (LM4040-2.5) .................................................................................................................60 µA to 15 mA
Reverse Current (LM4040-4.1) .................................................................................................................68 µA to 15 mA
Reverse Current (LM4040-5.0) .................................................................................................................74 µA to 15 mA
Reverse Current (LM4041-1.2) .................................................................................................................60 µA to 12 mA
Reverse Current (LM4041-ADJ) ...............................................................................................................60 µA to 12 mA
Output Voltage Range (LM4041-ADJ) ......................................................................................................... 1.24V to 10V
† Notice:
Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice:
The device is not guaranteed to function outside its operating ratings.
Note 1:
The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
(max-
imum junction temperature),
Ɵ
JA
(junction-to-ambient thermal resistance), and T
A
(ambient temperature).
The maximum allowable power dissipation at any temperature is P
DMAX
= (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.
2:
Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series
with 100 pF. The machine model is a 200 pF capacitor discharged directly into each pin.
2017-2018 Microchip Technology Inc.
DS20005757B-page 3
LM4040/LM4041
LM4040-2.5 ELECTRICAL CHARACTERISTICS (Note
1)
T
A
= Operating Temperature Range, T
A
= T
J
= –40°C to +85°C, unless noted.
Parameters
LM4040C
Reverse-Breakdown Voltage
Reverse-Breakdown Voltage
Tolerance (Note
2)
Minimum Operating Current
Average Reverse-Breakdown
Voltage Temperature
Coefficient
Reverse-Breakdown Voltage
Change with Operating
Current Change
I
RMIN
∆V
R
/∆
T
V
R
—
—
—
—
—
—
—
—
∆V
R
/∆I
R
—
—
—
—
Reverse Dynamic Impedance
Wideband Noise
Reverse-Breakdown Voltage
Long-Term Stability
LM4040D
Reverse-Breakdown Voltage
Reverse-Breakdown Voltage
Tolerance (Note
2)
Minimum Operating Current
Average Reverse-Breakdown
Voltage Temperature
Coefficient
Note 1:
2:
I
RMIN
∆V
R
/∆
T
V
R
—
—
—
—
—
—
—
—
2.500
—
—
45
—
±20
±15
±15
—
±25
±49
65
70
—
±150
—
V
mV
mV
µA
I
R
= 100 µA, T
A
= +25°C
I
R
= 100 µA, T
A
= +25°C
I
R
= 100 µA
T
A
= +25°C
—
ppm/°C I
R
= 10 mA, T
A
= +25°C
I
R
= 1 mA
I
R
= 100 µA, T
A
= +25°C
Z
R
e
N
∆V
R
—
—
—
2.500
—
—
45
—
±20
±15
±15
0.3
—
2.5
—
0.3
35
120
—
±12
±29
60
65
—
±100
—
0.8
1.0
6.0
8.0
0.9
—
—
Ω
mV
V
mV
mV
µA
I
R
= 100 µA, T
A
= +25°C
I
R
= 100 µA, T
A
= +25°C
I
R
= 100 µA
T
A
= +25°C
—
ppm/°C I
R
= 10 mA, T
A
= +25°C
I
R
= 1 mA
I
R
= 100 µA, T
A
= +25°C
I
RMIN
≤
I
R
≤
1 mA,
T
A
= +25°C
I
RMIN
≤
I
R
≤
1 mA
1 mA
≤
I
R
≤
15 mA,
T
A
= +25°C
1 mA
≤
I
R
≤
15 mA
I
R
= 1 mA, f = 120 Hz,
I
AC
= 0.1 I
R
, T
A
= +25°C
Sym.
Min.
Typ.
Max.
Units
Conditions
µV
RMS
I
R
= 100 µA, T
A
= +25°C,
10 Hz
≤
f
≤
10 kHz
ppm
t = 1000 hrs., T
A
= +25°C
±0.1°C, I
R
= 100 µA
Specification for packaged product only.
The boldface (overtemperature) limit for Reverse-Breakdown Voltage Tolerance is defined as the room
temperature Reverse-Breakdown Voltage Tolerance ±[(∆V
R
/∆T)(65°C)(V
R
)].
∆V
R
/∆T is the V
R
tempera-
ture 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% ±100 ppm/°C × 65°C
b. D-grade: ±1.98% = ±1.0% ±150 ppm/°C × 65°C
Example: The C-grade LM4040-2.5 has an overtemperature Reverse-Breakdown Voltage tolerance of
±2.5 × 1.15% = ±29 mV.
DS20005757B-page 4
2017-2018 Microchip Technology Inc.
LM4040/LM4041
LM4040-2.5 ELECTRICAL CHARACTERISTICS (Note
1)
(CONTINUED)
T
A
= Operating Temperature Range, T
A
= T
J
= –40°C to +85°C, unless noted.
Parameters
Reverse-Breakdown Voltage
Change with Operating
Current Change
Sym.
∆V
R
/∆I
R
Min.
—
—
—
—
Reverse Dynamic Impedance
Wideband Noise
Reverse-Breakdown Voltage
Long-Term Stability
Note 1:
2:
Z
R
e
N
∆V
R
—
—
—
Typ.
0.3
—
2.5
—
0.3
35
120
Max.
1.0
1.2
8.0
10.0
1.1
—
—
Ω
Units
mV
Conditions
I
RMIN
≤
I
R
≤
1 mA,
T
A
= +25°C
I
RMIN
≤
I
R
≤
1 mA
1 mA
≤
I
R
≤
15 mA,
T
A
= +25°C
1 mA
≤
I
R
≤
15 mA
I
R
= 1 mA, f = 120 Hz,
I
AC
= 0.1 I
R
, T
A
= +25°C
µV
RMS
I
R
= 100 µA,
10 Hz
≤
f
≤
10 kHz
ppm
t = 1000 hrs., T
A
= +25°C
±0.1°C, I
R
= 100 µA
Specification for packaged product only.
The boldface (overtemperature) limit for Reverse-Breakdown Voltage Tolerance is defined as the room
temperature Reverse-Breakdown Voltage Tolerance ±[(∆V
R
/∆T)(65°C)(V
R
)].
∆V
R
/∆T is the V
R
tempera-
ture 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% ±100 ppm/°C × 65°C
b. D-grade: ±1.98% = ±1.0% ±150 ppm/°C × 65°C
Example: The C-grade LM4040-2.5 has an overtemperature Reverse-Breakdown Voltage tolerance of
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