Issue 2 - February 2007 1 www.zetex.com
© Zetex Semiconductors plc 2007
LM4040
Precision micropower shunt voltage references
Description
Ordering information
The LM4040 is a family of bandgap circuits
designed to achieve precision micro-power
voltage references of 2.5V and 5.0V. The
devices are available in 0.5% C-grade and 1%
D-grade initial tolerances.
They are available in small outline SOT23
surface mount package which is ideal for
applications where space saving is important.
Excellent performance is maintained over the
60µA to 15mA 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 LM4040 voltage reference.
Features
• Small packages: SOT23
• No output capacitor required
• Output voltage tolerance
• LM4040C ±0.5% at 25°C
• LM4040D ±1% at 25°C
• Low output noise
(10Hz to 10kHz).............. 45VRMS
• Wide operating current range 60
A to 15mA
• Extended temperature range -40°C to +125°C
• Low temperature coefficient 100 ppm/°C (max)
Applications
• Battery powered equipment
• Precision power supplies
• Portable instrumentation
• Portable communications devices
• Notebook and palmtop computers
• Data acquisition systems
Pinout information
25°C
Tol.
Voltage
(V)
Order code Pack Part
mark
Status Reel size Tape
width
QuantIty
per reel
0.5% 2.5 LM4040C25FTA SOT23 R2C Preview 7”, 180mm 8mm 3000
5.0 LM4040C50FTA SOT23 R5C Preview 7”, 180mm 8mm 3000
1% 2.5 LM4040D25FTA SOT23 R2D Preview 7”, 180mm 8mm 3000
5.0 LM4040D50FTA SOT23 R5D Preview 7”, 180mm 8mm 3000
*
Anode
Cathode
Top view
* Pin 3 must be left floating or connected to pin 2
1
3
2
LM4040_F (SOT23)
LM4040
Issue 2 - February 2007 2 www.zetex.com
© Zetex Semiconductors plc 2007
Absolute maximum ratings
Continuous reverse current (IR) ...................................... 20mA
Continuous forward current (IREF) .................................. 10mA
Operating junction temperature ..................................... -40°C to 150°C
Storage temperature ....................................................... -55°C to 150°C
Operation above the absolute maximum rating may cause device failure. Operation at the
absolute maximum ratings, for extended periods, may reduce device reliability.
Unless otherwise stated voltages specified are relative to the ANODE pin.
Package thermal data
Recommended operating conditions
Package ⍜JA PDIS
Tamb =25°C, TJ = 150°C
SOT23 380°C/W 330mW
Min. Max. Units
Reverse current 0.06 15 mA
Operating ambient temperature range -40 125 °C
LM4040 - 2.5
Issue 2 - February 2007 3 www.zetex.com
© Zetex Semiconductors plc 2007
Electrical characteristics
Over recommended operating conditions, Tamb = 25°C, unless otherwise stated.
Symbol Parameter Conditions Typ. LM4040C
limits
LM4040D
limits
Units
Tamb
VREF
Reverse breakdown
voltage
IR = 100A25°C 2.5 V
Reverse breakdown
voltage tolerance IR = 100A
25°C ±12 ±25
mV-40 to 85°C ±29 ±49
-40 to 125°C ±38 ±63
IRMIN Minimum operating
current
25°C
45
60 65
A-40 to 85°C 65 70
-40 to 125°C 68 73
⌬VR/⌬T
Average reverse
breakdown voltage
temperature
coefficient
IR = 10mA
-40 to 125°C
±20
ppm/°C
IR = 1mA, ±15 ±100 ±150
IR = 100A±15
⌬VR/⌬IRReverse breakdown
change with current
IRMIN < IR <
1mA
25°C
0.3
0.8 1.0
mV
-40 to 85°C 1.0 1.2
-40 to 125°C 1.0 1.2
1mA < IR <
15 mA
25°C
2.5
6.0 8.0
-40 to 85°C 8.0 10.0
-40 to 125°C 8.0 10.0
ZRDynamic output
impedance
IR = 1mA, f = 120Hz
IAC = 0.1IR
0.3 0.9 1.1 ⍀
enNoise voltage IR = 100A
10Hz < f < 10kHz
45 VRMS
⌬VRLong term stability
(non cumulative)
t = 1000Hrs
IR = 100A
25°C 120 ppm
VHYST Thermal hysteresis ⌬T = -40°C to +125°C 0.08 %
LM4040 - 5.0
Issue 2 - February 2007 4 www.zetex.com
© Zetex Semiconductors plc 2007
Electrical characteristics
Over recommended operating conditions, Tamb = 25°C, unless otherwise stated.
Symbol Parameter Conditions Typ
LM4040C
limits
LM4040D
limits
Units
Tamb
VREF
Reverse breakdown
voltage
IR = 100A25°C5.00 V
Reverse breakdown
voltage tolerance IR = 100A
25°C ±25 ±50
mV-40 to 85°C ±58 ±99
-40 to 125°C ±75 ±125
IRMIN Minimum operating
current
25°C
54
74 79
µA-40 to 85°C 80 85
-40 to 125°C 83 88
⌬VR/⌬T
Average reverse
breakdown voltage
temperature coefficient
IR = 10mA
-40 to 125°C
±30
ppm/°C
IR = 1mA, ±20 ±100 ±150
IR = 100A±20
⌬VR/⌬IRReverse breakdown
change with current
IRMIN < IR <
1mA
25°C
0.5
1.0 1.3
mV
-40 to 85°C 1.4 1.8
-40 to 125°C 1.4 1.8
1mA < IR <
15mA
25°C
3.5
8.0 10.0
-40 to 85°C 12.0 15.0
-40 to 125°C 12.0 15.0
ZRDynamic output
impedance
IR = 1mA, f = 120Hz
IAC = 0.1IR
0.5 1.1 1.5 ⍀
enNoise voltage IR = 100A
10Hz < f < 10kHz
105 VRMS
⌬VRLong term stability (non
cumulative)
t = 1000Hrs
IR = 100A
25°C 120 ppm
VHYST Thermal hysteresis ⌬T = -40°C to +125°C 0.08 %
LM4040
Issue 2 - February 2007 5 www.zetex.com
© Zetex Semiconductors plc 2007
Package outline - SOT23
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
Dim. Millimeters Inches Dim. Millimeters Inches
Min. Max. Min. Max. Min. Max. Max. Max.
A - 1.12 - 0.044 e1 1.90 NOM 0.075 NOM
A1 0.01 0.10 0.0004 0.004 E 2.10 2.64 0.083 0.104
b 0.30 0.50 0.012 0.020 E1 1.20 1.40 0.047 0.055
C 0.085 0.120 0.003 0.008 L 0.25 0.62 0.018 0.024
D 2.80 3.04 0.110 0.120 L1 0.45 0.62 0.018 0.024
e0.95 NOM0.0375 NOM-----
E
e
L
e1
D
A
c
E1
L1
A1
b
3 leads
LM4040
Issue 2 - February 2007 6 www.zetex.com
© Zetex Semiconductors plc 2007
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© 2007 Published by Zetex Semiconductors plc
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Applications disclaimer
The circuits in this design/application note are offered as design ideas. It is the responsibility of the user to ensure that the circuit is fit for
the user’s application and meets with the user’s requirements. No representation or warranty is given and no liability whatsoever is
assumed by Zetex with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights
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or
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Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices.
The possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent
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Product status key:
“Preview” Future device intended for production at some point. Samples may be available
“Active” Product status recommended for new designs
“Last time buy (LTB)” Device will be discontinued and last time buy period and delivery is in effect
“Not recommended for new designs”
Device is still in production to support existing designs and production
“Obsolete” Production has been discontinued
Datasheet status key:
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may change in any manner without notice.
“Provisional version” This term denotes a pre-release datasheet. It provides a clear indication of anticipated performance.
However, changes to the test conditions and specifications may occur, at any time and without notice.
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specifications may occur, at any time and without notice.
