LM4040
Precision micropower shunt voltage references
Description
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
LM4040D
±0.5% at 25°C
±1% at 25°C
Applications
•
•
•
•
•
•
Battery powered equipment
Precision power supplies
Portable instrumentation
Portable communications devices
Notebook and palmtop computers
Data acquisition systems
Low output noise
(10Hz to 10kHz) .............. 45 V
RMS
Wide operating current range 60 A to 15mA
Extended temperature range -40°C to +125°C
Low temperature coefficient 100 ppm/°C (max)
Pinout information
LM4040_F (SOT23)
Cathode
1
3
*
Anode
2
Top view
* Pin 3 must be left floating or connected to pin 2
Ordering information
25°C Voltage
Tol.
(V)
0.5%
1%
2.5
5.0
2.5
5.0
Order code
LM4040C25FTA
LM4040C50FTA
LM4040D25FTA
LM4040D50FTA
Pack
SOT23
SOT23
SOT23
SOT23
Part
mark
R2C
R5C
R2D
R5D
1
Status
Preview
Preview
Preview
Preview
Reel size
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
Tape QuantIty
width per reel
8mm
8mm
8mm
8mm
3000
3000
3000
3000
Issue 2 - February 2007
© Zetex Semiconductors plc 2007
www.zetex.com
LM4040
Absolute maximum ratings
Continuous reverse current (I
R
) ...................................... 20mA
Continuous forward current (I
REF
) .................................. 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
Package
SOT23
JA
P
DIS
T
amb
=25°C, T
J
= 150°C
330mW
380°C/W
Recommended operating conditions
Min.
Reverse current
Operating ambient temperature range
0.06
-40
Max.
15
125
Units
mA
°C
Issue 2 - February 2007
© Zetex Semiconductors plc 2007
2
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LM4040 - 2.5
Electrical characteristics
Over recommended operating conditions, T
amb
= 25°C, unless otherwise stated.
Symbol Parameter
Conditions
T
amb
Reverse breakdown
voltage
V
REF
Reverse breakdown
voltage tolerance
I
R
= 100 A
25°C
25°C
I
R
= 100 A
-40 to 85°C
-40 to 125°C
25°C
I
RMIN
Minimum operating
current
I
R
= 10mA
I
R
= 1mA,
I
R
= 100 A
25°C
I
RMIN
< I
R
<
1mA
V
R
/ I
R
Reverse breakdown
change with current
1mA < I
R
<
15 mA
Z
R
e
n
V
R
V
HYST
Dynamic output
impedance
Noise voltage
Long term stability
(non cumulative)
Thermal hysteresis
-40 to 85°C
-40 to 125°C
25°C
-40 to 85°C
-40 to 125°C
I
R
= 1mA, f = 120Hz
I
AC
= 0.1I
R
I
R
= 100 A
10Hz < f < 10kHz
t = 1000Hrs
I
R
= 100 A
25°C
0.3
45
120
0.08
2.5
0.3
-40 to 125°C
-40 to 85°C
-40 to 125°C
Average reverse
breakdown voltage
V
R
/ T
temperature
coefficient
±20
±15
±15
0.8
1.0
1.0
6.0
8.0
8.0
0.9
1.0
1.2
1.2
8.0
10.0
10.0
1.1
V
RMS
ppm
%
mV
±100
±150
ppm/°C
45
Typ. LM4040C LM4040D
limits
limits
2.5
±12
±29
±38
60
65
68
±25
±49
±63
65
70
73
A
mV
Units
V
T = -40°C to +125°C
Issue 2 - February 2007
© Zetex Semiconductors plc 2007
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LM4040 - 5.0
Electrical characteristics
Over recommended operating conditions, T
amb
= 25°C, unless otherwise stated.
Symbol Parameter
Conditions
T
amb
Reverse breakdown
voltage
V
REF
Reverse breakdown
voltage tolerance
I
R
= 100 A
25°C
25°C
I
R
= 100 A
-40 to 85°C
-40 to 125°C
25°C
I
RMIN
Minimum operating
current
-40 to 85°C
-40 to 125°C
I
R
= 10mA
Average reverse
I
R
= 1mA,
V
R
/ T breakdown voltage
temperature coefficient
I
R
= 100 A
I
RMIN
< I
R
<
1mA
Reverse breakdown
V
R
/ I
R
change with current
1mA < I
R
<
15mA
Z
R
e
n
V
R
V
HYST
Dynamic output
impedance
Noise voltage
±30
-40 to 125°C ±20
±20
25°C
-40 to 85°C
-40 to 125°C
25°C
-40 to 85°C
-40 to 125°C
I
R
= 1mA, f = 120Hz
I
AC
= 0.1I
R
I
R
= 100 A
10Hz < f < 10kHz
25°C
0.5
105
120
0.08
3.5
0.5
1.0
1.4
1.4
8.0
12.0
12.0
1.1
1.3
1.8
1.8
10.0
15.0
15.0
1.5
V
RMS
ppm
%
mV
±100
±150
ppm/°C
54
Typ LM4040C LM4040D
limits
limits
5.00
±25
±58
±75
74
80
83
±50
±99
±125
79
85
88
µA
mV
Units
V
Long term stability (non t = 1000Hrs
cumulative)
I
R
= 100 A
Thermal hysteresis
T = -40°C to +125°C
Issue 2 - February 2007
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LM4040
Package outline - SOT23
E
e
b
3 leads
e1
L1
E1
D
A
A1
L
c
Dim.
A
A1
b
C
D
e
Millimeters
Min.
-
0.01
0.30
0.085
2.80
Max.
1.12
0.10
0.50
0.120
3.04
-
Inches
Min.
0.0004
0.012
0.003
0.110
Max.
0.044
0.004
0.020
0.008
0.120
Dim.
e1
E
E1
L
L1
-
Millimeters
Min.
2.10
1.20
0.25
0.45
-
Max.
2.64
1.40
0.62
0.62
-
1.90 NOM
Inches
Max.
0.083
0.047
0.018
0.018
-
Max.
0.104
0.055
0.024
0.024
-
0.075 NOM
0.95 NOM
0.0375 NOM
Note:
Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
Issue 2 - February 2007
© Zetex Semiconductors plc 2007
5
www.zetex.com
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