LM4041
A
Description
The LM4041 is a bandgap circuit designed to achieve a
precision micro-power voltage reference of 1.225 V. The
device is available in the small outline SOT23 and SC70-5
surface mount packages which are ideal for applications
where space saving is important.
Both packages are available to 0.5% C grade and 1%
D grade for precision applications. Excellent performance is
maintained over the 60µA to 12mA operating current range
with a typical temperature coefficient of only 20ppm/°C. The
device has been designed to be highly tolerant of capacitive
loads so maintaining excellent stability.
This device offers a pin for pin compatible alternative to the
LM4041 voltage reference in both adjustable and 1.225V
output variants.
Features
• Small packages: SOT23, SC70-5
• No output capacitor required
• Output voltage tolerance
• LM4041C: ±0.5% at 25°C
• LM4041D: ±1% at 25°C
• Low output noise: 20µVrms
(10Hz to 10kHz)
• Wide operating current range: 60µA to 12mA
• Extended temperature range: -40°C to +125°C
• Low temperature coefficient : 100ppm/°C (max)
• All parts AEC-Q100 Grade1 qualified
Applications
• Battery powered equipment
• Precision power supplies
• Portable instrumentation
• Portable communications devices
• Notebook and palmtop computers
• Data acquisition systems
LM4041
Document number: DS32020 Rev. 8 - 2
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Pin Assignments
LM4041_F (SOT23)
CATHODE 1
ANODE
Pin 3 must left floating or connected to pin 2.
LM4041_ADJF….(SOT23)
REF 1
CATHODE
LM4041_H5 (SC70-5)
ANODE 1
N/C 2
CATHODE
Pin 2 must be left floating or connected to pin 1
LM4041_ADJH5 (SC70-5)
N/C 1
NODE 2
CATHODE 3
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2
2
3
3 N/C
3 ANODE
5 N/C
4 N/C
5 REF
4 N/C
September 2011
© Diodes Incorporated
LM4041
Absolute Maximum Ratings
Description Rating Unit
Continuous Reverse Current (IR) 20 mA
Continuous Forward Current (IF) 10 mA
Maximum Output Voltage (LM4041_ADJ) 15 V
Junction Temperature -40 to 155 °C
Storage Temperature -55 to 150 °C
ESD Ratings
Human Body Model 4000 V
Machine Model 200 V
These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Operation at the absolute
maximum rating, for extended periods may reduce device reliability.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD prec autions should be taken
when handling and transporting these devices.
Package Thermal Data
Package θJA
SOT23 380°C/W 330mW
SC70-5 420°C/W 300mW
Recommended Operating Conditions
Parameter Min Max Units
Reverse Current 0.06 12 mA
Output Voltage Range 1.24 10 V
Operating Ambient Temperature Range -40 125
LM4041
Document number: DS32020 Rev. 8 - 2
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
P
TA = 25°C, TJ = 150°C
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DIS
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°C
September 2011
© Diodes Incorporated
LM4041
A
Ω
A
Ω
Electrical Characteristics
LM4041-1.2
Electrical characteristics over recommended operating conditions, TA = 25°C, unless otherwise stated, I
LM4041C and LM4041D have initial tolerances of 0.5% and 1% respectively.
Symbol Parameter
Reverse Breakdown Voltage
V
Reverse Breakdown Voltage
REF
Tolerance
I
Minimum Operating Current
RMIN
ΔVR/ΔΤ
ΔVR/ΔΙR
LM4041-Adj
Electrical characteristics over recommended operating conditions, TA = 25°C, I
grade D designates initial reference voltage tolerance of ±1% and is measured at an output/cathode voltage of 5V.
Symbol Parameter
V
I
RMIN
ΔVR/ΔΤ
ΔVR/ΔVK
I
REF
ΔVR/ΔΙR
ZR Dynamic Output Impedance
en Noise Voltage IR = 100µA 10Hz < f < 10kHz 20 µV
ΔVR
LM4041
Document number: DS32020 Rev. 8 - 2
Average Reverse Breakdown
Voltage Temperature Coefficient
Reverse Breakdown Change With
Current
ZR Dynamic Output Impedance IR = 1mA, f = 120Hz, IAC = 0.1IR 0.5 1.5 2.0
en Noise Voltage IR = 100µA 10Hz < f < 10kHz 20 µV
Long Term Stability (Non
ΔVR
cumulative)
Reverse Breakdown Voltage
REF
Reverse Breakdown Voltage
Tolerance
Minimum Operating Current
Average Reverse Breakdown
Voltage Temperature
Coefficient
Reference voltage change with
cathode voltage change
Reference input current
Reverse Breakdown Change
With Current
Long Term Stability
(Non cumulative)
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
<IR<12mA, V
RMIN
Conditions
T
Typ
LM4041C
Limits
LM4041D
Limits
25°C 1.225 V
IR = 100 µA
25°C ±6 ±12
-40 to 85°C ±14 ±24
-40 to 125°C ±18.4 ±31
25°C
60 65
45
-40 to 125°C 68 73
I
= 10 mA
R
IR = 1 mA, ±15 ±100 ±150
-40 to 125°C
±20
IR = 100 µA ±15
< IR < 1mA
I
RMIN
25°C
-40 to 85°C 2.0 2.5
0.7
1.5 2.0
-40 to 125°C 2.0 2.5
1mA < IR < 12 mA
25°C
-40 to 85°C 8.0 10.0
2.5
6.0 8.0
-40 to 125°C 8.0 10.0
t = 1000Hrs I
= 100µA 120
R
Conditions
<IR <12 mA, V
RMIN
T
REF
<V
Typ
<10V unless otherwise stated. The
OUT
LM4041D
Limits
25°C 1.233 V
IR = 100 µA, VKA = 5V
25°C ±12
-40 to 85°C ±24
-40 to 125°C ±30
25°C
65
45
-40 to 125°C 73
= 10 mA
I
R
IR = 1 mA, ±15 ±150
-40 to 125°C
±20
IR = 100 µA ±15
= 1mA
I
R
25°C
-1.55
-2.5
-40 to 125°C -4.0
25°C
150
60
-40 to 125°C 200
I
< IR < 1mA
RMIN
> 1.6V
V
OUT
1mA < IR < 12 mA
> 1.6V
V
OUT
I
= 1mA,
R
f = 120Hz
= 0.1IR
I
AC
t = 1000Hrs I
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25°C
-40 to 85°C 2.5
0.7
-40 to 125°C 2.5
25°C
-40 to 85°C 8.0
2
-40 to 125°C 10.0
V
= V
KA
0.5
REF
VKA = 10V 2
= 100µA 120 ppm
R
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2.0
6.0
REF<VOUT
<10V.
Units
mV
µA -40 to 85°C 65 70
ppm/°C
mV
RMS
ppm
Units
mV
µA -40 to 85°C 70
ppm/°C
mV/V -40 to 85°C -3.0
nA -40 to 85°C 200
mV
RMS
September 2011
© Diodes Incorporated
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Typical Characteristics LM4041 1.225
LM4041
100
)
Ω
10
1
0.1
Reference Impedance (
0.01
0.1 1 10 100 1000
150uA, 1uF
Frequency (kHz)
Output Impedance vs. Frequency
LM4041
Document number: DS32020 Rev. 8 - 2
150uA, no cap
1mA, 1µF tant
1mA, no cap
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PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Application Information
In a conventional shunt regulator application (Figure 1), an
external series resistor (RS) is connected between the
supply voltage, V
R
and the LM4041 (I
voltage may vary, R
least the minimum acceptable I
when the supply voltage is at its minimum and the load
current is at its maximum value. When the supply voltage
is at its maximum and I
large enough so that the current flowing through the
LM4040 is less than 12 mA.
RS is determined by the supply voltage, (VS), the load and
operating current, (I
breakdown voltage, V
The LM4041 comes in two varients:
R
S
I
R
Figure 1
determines the current that flows through the load (IL)
S
R
• LM4041 with fixed 1.225V output
• LM4041_ADJ with variable output voltage.
, and the LM4041.
S
V
S
IR +
I
L
I
L
V
R
should be small enough to supply at
S
L
−
VV
=
S
+
II
RL
R
). Since load current and supply
to the LM4040 even
R
is at its minimum, RS should be
L
and IQ), and the LM4040’s reverse
.
R
RS
LM4041
Document number: DS32020 Rev. 8 - 2
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LM4041
The LM4041-ADJ’s output voltage can be adjusted to any
value in the range of 1.24V through 10V. The output
voltage is set by the ratio of two external feedback
resistors as shown in Figure 2 and the internal referenc e
voltage (V
The output voltage is found using the equatio n:
R
Printed circuit board layout considerations
LM4041 with fixed output voltage in th e SOT23 package
has the die attached to pin 1, which result s in an electrical
contact between pin 2 and pin 1. Therefore, pin 1 of the
SOT23 package must be left floating or connected to
pin 2.
LM4041 with fixed output voltage in t he SC70-5 package
have the die attached to pin 2, which results in an
electrical contact between pin 2 and pi n 1. Therefore, pin
2 must be left floating or connected to pin1.
).
V
R
S
I
R
Figure 2
S
IR + I
L
I
V
L
R
RO
V
O
⎛
⎜
⎜
⎝
⎞
R
2
⎟
1VV
+×=
⎟
R
1
⎠
September 2011
© Diodes Incorporated
Ordering Information
25°C
Voltage
Tol
0.5% 1.225
1%
† All parts AEC-Q100 grade 1 qualified
(V)
1.225
Adj
Package Outline Information
ORDER CODE QUALIFICATION† PACK
LM4041CFTA Commercial SOT23 R1C 7”, 180mm 8mm 3000
LM4041CQFTA Automotive SOT23 R1C 7”, 180mm 8mm 3000
LM4041CH5TA Commercial SC70-5 R1C 7”, 180mm 8mm 3000
LM4041DFTA Commercial SOT23 R1D 7”, 180mm 8mm 3000
LM4041DQFTA Automotive SOT23 R1D 7”, 180mm 8mm 3000
LM4041DH5TA Commercial SC70-5 R1D 7”, 180mm 8mm 3000
LM4041DADJFTA Commercial SOT23 RAD 7”, 180mm 8mm 3000
LM4041DADJH5TA Commercial SC70-5 RAD 7”, 180mm 8mm 3000
LM4041
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
PART
MARK
REEL SIZE
TAPE
WIDTH
QUANTITY
PER REEL
LM4041
Document number: DS32020 Rev. 8 - 2
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LM4041
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Copyright © 2011, Diodes Incorporated
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PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
IMPORTANT NOTICE
LIFE SUPPORT
LM4041
Document number: DS32020 Rev. 8 - 2
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