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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,
3.0V and 5.0V. The devices are availabl e in 0.2% B-grade,
0.5% C-grade and 1% D-grade initial tolerances.
They are available in small outline SOT23 and SC70-5
surface mount packages which are ideal for applications
where space is at a premium.
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.
Pin Assignments
LM4040 F (SOT23)
Cathode
Anode
Pin 1 must be left floating or connected to pin 2
Anode
3
2
LM4040 H5 (SC70-5)
1
*
2
Top view
1
*
4
N/C
Features
• Small packages: SOT23 & SC70-5
• No output capacitor required
• Output voltage tolerance
o LM4040B ±0.2% at 25°C
o LM4040C ±0.5% at 25°C
o LM4040D ±1% at 25°C
• Low output noise
• (10Hz to 10kHz) .............. 45µV
• Wide operating current range 60µA to 15mA
• Extended temperature range -40°C to +125°C
• Low temperature coefficient 100 ppm/°C (max)
• All parts AEC-Q100 Grade1 qualified
RMS
Applications
• Battery powered equipment
• Precision power supplies
• Portable instrumentation
• Portable communications devices
• Notebook and palmtop computers
• Data acquisition systems
Cathode
* Pin 2 must be left floating or connected to pin 1
3
To p View
LM4040
Document number: DS33195 Rev. 5 - 2
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N/C
5
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LM4040
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Absolute Maximum Ratings (Voltages to GND Unless Otherwise Stated)
Parameter Rating Unit
Continuous Reverse Current 20 mA
Continuous Forward Current 10 mA
Operating Junction Temperature -40 to +150 °C
Storage Temperature -55 to +150 °C
Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum rating,
for extended periods, may reduce device reliability.
Unless otherwise stated voltages specified are relative to the ANODE pin.
Package Thermal Data
P
Package θJA
SOT23 380°C/W 330mW
SC70-5 380°C/W 330mW
T
AMB
Recommended Operating Conditions
Min. Max. Units
Reverse Current 0.06 15 mA
Operating Ambient Temperature Range -40 125 °C
LM4040
Document number: DS33195 Rev. 5 - 2
DIS
= 25°C, TJ = 150°C
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PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Electrical Characteristics (Test conditions: T
LM4040-2.5
Product Line o
Diodes Incorporated
= 25°C, unless otherwise specified.)
AMB
LM4040
Symbol Parameter
Reverse breakdown
voltage
V
REF
Reverse breakdown
voltage tolerance
I
= 100µA
R
= 100µA
I
R
Conditions
T
-40 to +85°C ±21 ±29 ±49
-40 to +125°C ±30 ±38 ±63
Typ.
AMB
25°C 2.5 V
25°C
LM4040
B Limits
LM4040
C Limits
LM4040
D Limits
±5 ±12 ±25
Units
mV
25°C 45 60 60 65
I
RMIN
ΔVR/ΔT
ΔVR/ΔIR
ZR
en
VR
V
HYST
LM4040
Document number: DS33195 Rev. 5 - 2
Minimum operating
current
Average reverse
breakdown voltage
temperature coefficient
I
= 10mA
R
IR = 1mA
IR = 100µA
RMIN IR
I
< 1mA
Reverse breakdown
change with current
1mA < IR
< 15mA
= 1mA, f = 120Hz
Dynamic output
impedance
Noise voltage
Long term stability (non
cumulative)
Themal hysteresis ΔT = -40°C to =125°C 0.08 %
I
R
IAC = 0.1IR
= 100µA
I
R
10Hz < f < 10kHz
t = 1000Hrs, I
-40 to +85°C
-40 to +125°C 68 68 73
65 65 70
±20
-40 to +125°C
±15 ±100 ±100 ±150 ppm/°C
±15
25°C 0.3 0.8 0.8 1.0
-40 to +85°C
-40 to +125°C 1.0 1.0 1.2
1.0 1.0 1.2
25°C 2.5 6.0 6.0 8.0
-40 to +85°C
-40 to +125°C 8.0 8.0 10.0
8.0 8.0 10.0
0.3 0.8 0.9 1.1 Ω
35
= 100µA
R
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120 ppm
© Diodes Incorporated
µA
mV
µV
RMS
March 2012
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PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Electrical Characteristics (cont.) (Test conditions: T
LM4040-3.0
Product Line o
Diodes Incorporated
= 25°C, unless otherwise specified.)
AMB
LM4040
Symbol Parameter
Reverse breakdown
voltage
V
REF
Reverse breakdown
voltage tolerance
I
= 100µA
R
I
= 100µA
R
Conditions
T
AMB
Typ.
25°C 3.0 V
25°C
-40 to +85°C ±26 ±34 ±59
LM4040
B Limits
LM4040
C Limits
LM4040
D Limits
±6 ±15 ±30
Units
mV
-40 to +125°C TBD ±45 ±75
25°C 47 62 62 67
I
RMIN
ΔVR/ΔT
ΔVR/ΔIR
ZR
en
VR
V
HYST
Minimum operating
current
Average reverse
breakdown voltage
temperature coefficient
Reverse breakdown
change with current
Dynamic output
impedance
Noise voltage
Long term stability (non
cumulative)
Themal hysteresis ΔT = -40°C to = 125°C 0.08 %
-40 to +85°C
-40 to +125°C 70 70 75
I
= 10mA
R
IR = 1mA
-40 to +125°C
IR = 100µA
I
RMIN IR
< 1mA
1mA < IR
< 15mA
25°C 0.4 0.8 0.8 1.0
-40 to +85°C
-40 to +125°C 1.1 1.1 1.3
25°C 2.7 6.0 6.0 8.0
-40 to +85°C
-40 to +125°C 9.0 9.0 11.0
IR = 1mA, f = 120Hz
I
= 0.1IR
AC
IR = 100µA
10Hz < f < 10kHz
t = 1000Hrs, IR = 100µA
67 67 72
±20
±15 ±100 ±100 ±150 ppm/°C
±15
1.1 110 1.3
9.0 9.0 11.0
0.4 0.9 0.9 1.2 Ω
35
120 ppm
µV
µA
mV
RMS
LM4040
Document number: DS33195 Rev. 5 - 2
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PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Electrical Characteristics (cont.) (Test conditions: T
LM4040-5.0
Product Line o
Diodes Incorporated
= 25°C, unless otherwise specified.)
AMB
LM4040
Symbol Parameter
Reverse breakdown
voltage
V
REF
Reverse breakdown
voltage tolerance
I
= 100µA
R
I
= 100µA
R
Conditions
T
AMB
Typ.
25°C 5.0 V
25°C
-40 to +85°C ±43 ±58 ±99
LM4040
B Limits
LM4040
C Limits
LM4040
D Limits
±10 ±25 ±50
Units
mV
-40 to +125°C ±60 ±75 ±125
25°C 54 74 74 79
I
RMIN
ΔVR/ΔT
ΔVR/ΔIR
ZR
en
VR
V
HYST
LM4040
Document number: DS33195 Rev. 5 - 2
Minimum operating
current
Average reverse
breakdown voltage
temperature coefficient
Reverse breakdown
change with current
Dynamic output
impedance
Noise voltage
Long term stability (non
cumulative)
Themal hysteresis ΔT = -40°C to =125°C 0.08 %
-40 to +85°C
-40 to +125°C 83 83 88
I
= 10mA
R
IR = 1mA
-40 to +125°C
IR = 100µA
I
RMIN IR
< 1mA
1mA < IR
< 15mA
25°C 0.5 1.0 1.0 1.3
-40 to +85°C
-40 to +125°C 1.4 1.4 1.8
25°C 3.5 8.0 8.0 10.0
-40 to +85°C
-40 to +125°C 12.0 12.0 15.0
IR = 1mA, f = 120Hz
I
= 0.1IR
AC
IR = 100µA
10Hz < f < 10kHz
t = 1000Hrs, IR = 100µA
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80 80 85
±30
±20 ±100 ±100 ±150 ppm/°C
±20
1.4 1.4 1.8
12.0 12.0 15.0
0.5 1.1 1.1 1.5 Ω
80
120 ppm
© Diodes Incorporated
µA
mV
µV
RMS
March 2012
Page 6
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f
%
R
R
R
R
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Typical Characteristics LM4040-2.5
1.00
Product Line o
Diodes Incorporated
LM4040
1.00
REF
V (%)
Δ
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
T = 25°C
A
I = 100µA
R
C = 1.0µF
Tantalum
I = 100µA
R
TEMPERATURE (°C)
Temperature Coefficient
L
40 80 120-40 0
Reference Voltage
C = 0
L
0.75
0.50
)
0.25
0.00
REF
V (
Δ
-0.25
-0.50
-0.75
-1.00
TEMPERATURE (°C)
100
T = 25°C
A
I = 1mA
R
Ω
10
Temperature Coefficient
C = 1.0µF
Tantalum
40 80 120-40 0
Reference Voltage
L
I = 1mA
R
C = 0
L
1
0.1
R
Z , REFERENCE IMPEDANCE ( )
0.01
10k 100k 1M100 1k
Reference Impedance vs. Fr equency
500
FREQUENCY (Hz)
480
460
440
420
√
400
T = 25°C
A
I = 100µA
R
ENT (µA)
SE CU
380
360
NOISE (nV/ Hz)
340
EVE
R
I,
320
300
123-1 0
FREQUENCY (Hz)
Noise Voltage vs. Fr eq uency
Reference Impedance vs. Frequency
500
T = 25°C
400
300
200
100
-100
-200
-300
A
0
V , REVERSE VOLTAGE (V)
R
Referenc e C ur rent vs. Volt age
10k 100k 1M100 1k
FREQUENCY (Hz)
123-1 0
LM4040
Document number: DS33195 Rev. 5 - 2
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REFEREN
C
M
P
A
N
C
R
R
R
R
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Typical Characteristics LM4040-3.0
1.00
Product Line o
Diodes Incorporated
LM4040
1.00
REF
V (%)
Δ
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
T = 25°C
A
I = 100µA
R
TEMPERATURE (°C)
Temperature Coefficient
C = 1.0µF
L
Tantalum
40 80 120-40 0
Reference Voltage
I = 100µA
R
C = 0
L
0.75
0.50
0.25
0.00
REF
V (%)
Δ
-0.25
-0.50
-0.75
-1.00
TEMPERATURE (°C)
100
Ω
E ( )
10
ED
1
E I
Temperature Coefficient
40 80 120-40 0
Refere n ce Volt age
0.1
,
R
10k 100k 1M100 1k
Reference Impedance vs. Frequency
650
600
550
√
500
NOISE (nV/ Hz)
450
400
LM4040
Document number: DS33195 Rev. 5 - 2
FREQUENCY (Hz)
1k 10k 100k10 100
FREQUENCY (Hz)
Noise Voltage vs. Frequency
7 of 12
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0.01
500
400
300
ENT (µA)
200
100
SE CU
EVE
-100
R
I,
-200
-300
10k 100k 1M100 1k
Refere nce Impedance vs. Frequen cy
T = 25°C
A
0
FREQUENCY (Hz)
V , REVERSE VOLTAGE (V)
Reference Current vs. Voltage
12 4-1 0
R
3
March 2012
© Diodes Incorporated
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%
Z
REFEREN
C
M
P
A
N
C
R
R
R
R
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Typical Characteristics LM4040-5.0
1.00
Product Line o
Diodes Incorporated
LM4040
1.00
REF
V (%)
Δ
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
TEMPERATURE (°C)
40 80 120-40 0
Referenc e Voltage
Temperature Coefficient
0.75
0.50
)
0.25
0.00
REF
V (
Δ
-0.25
-0.50
-0.75
-1.00
TEMPERATURE (°C)
100
Ω
E ( )
10
ED
E I
Te mperature Coefficient
40 80 120-40 0
Refere nce Voltage
I = 1mA
R
√
NOISE (nV/ Hz)
1200
1000
800
600
400
10k 100k 1M100 1k
FREQUENCY (Hz)
Referenc e Impedance vs. Frequency
1k 10k 100k10 100
FREQUENCY (Hz)
Noise Voltage vs. Frequency
1
,
R
0.1
ENT (µA)
SE CU
EVE
-100
R
I,
-200
-300
-400
Reference I mpedance vs. Frequen cy
500
T = 25°C
A
400
300
200
100
0
V , REVERSE VOLTAGE (V)
R
Reference Current vs. Voltage
10k 100k 1M100 1k
FREQUENCY (Hz)
123-1 0
456
LM4040
Document number: DS33195 Rev. 5 - 2
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NPU
T
&
OUTPU
T
OLTAGE
O
O
U
T
OUTPU
T VOLT
O
O
PUT
O
UTP
U
T
O
T
G
O
O
G
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Start Up Characteristics LM4040-2.5, 3.0 and 5.0
6
5
(V)
LM4040-2.5
Product Line o
Diodes Incorporated
6
Input
5
LM4040
T = 25°C
A
R = 30k
S
4
V
3
2
1
I
0
0µ 2µ 4µ 6µ 8µ 10µ
TIME (s)
Long Pulse Response
7
6
AGE (V)
5
4
3
&
2
1
INP
LM4040-3.0
4
LTAGE (V)
3
UTPUT V
2
1
INPUT &
0
0µ 2µ 4µ 6µ 8µ 10µ
7
6
5
LTAGE (V)
4
3
UTPUT V
2
INPUT &
1
Output
TIME (s)
Short Pulse Response
0
0µ 2µ 4µ 6µ 8µ 10µ
TIME (s)
Long Puls e R esponse
0
0µ 2µ 4µ 6µ 8µ 10µ
TIME (s)
Short Pulse Response
LM4040-5.0
12
10
E (V)
A
8
L
V
6
4
&
2
IN
0
0µ 20µ 40µ 60µ
TIME (s)
Long Pulse Response
LM4040
Document number: DS33195 Rev. 5 - 2
80µ
100µ
9 of 12
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12
10
E (V)
8
LTA
6
UTPUT V
4
2
INPUT &
0
0µ 2µ 4µ 6µ 8µ 10µ
TIME (s)
Short Pulse Response
March 2012
© Diodes Incorporated
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LM4040
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
V
R
S
I
R
Printed circuit board layout considerations
LM4040s in the SOT23 package have the die attached to pin 1, which results in an electrical contact between pin 2 and pin
3. Therefore, pin 1 of the SOT-23 package must be left floating or connected to pin 2.
LM4040s in the SC70-5 package have the die attached to pin 2, which results in an electrical contact between pin 2 and pin
1. Therefore, pin 2 must be left floating or connected to pin1.
Ordering Information
25°C
Tol
0.2%
0.5%
1%
, and the LM4040.
S
S
IR +
I
L
I
L
V
R
Voltage
(V)
2.5
3.0
5.0
2.5
3.0
5.0
2.5
3.0
5.0
RS determines the current that flows through the load (IL) and the LM4040 (IR). Since load current and
supply voltage may vary, RS should be small enough to supply at le ast the minimum acceptable IR to the
LM4040 even when the supply voltage is at its minimum and the load cu rrent is at its maximum value.
When the supply voltage is at its maximum and IL is at its minimum, RS should be large enough so that
the current flowing through the LM4040 is less than 15 mA.
is determined by the supply voltage, (VS), the load and operating current, (IL and IR), and the
R
S
LM4040’s reverse breakdown voltage, V
VV
−
RS
R
=
S
Order Code Qualification† Package
LM4040B25FTA Commercial SOT23 R2B 7”, 180mm 8mm 3000
LM4040B25H5TA Commercial SC70-5 R2B 7”, 180mm 8mm 3000
LM4040B30FTA Commercial SOT23 R3B 7”, 180mm 8mm
LM4040B30H5TA Commercial SC70-5 R3B 7”, 180mm 8mm 3000
LM4040B50FTA Commercial SOT23 R5B 7”, 180mm 8mm
LM4040B50H5TA Commercial SC70-5 R5B 7”, 180mm 8mm 3000
LM4040C25FTA Commercial SOT23 R2C 7”, 180mm 8mm 3000
LM4040C25H5TA Commercial SC70-5 R2C 7”, 180mm 8mm 3000
LM4040C30FTA Commercial SOT23 R3C 7”, 180mm 8mm
LM4040C30H5TA Commercial SC70-5 R3C 7”, 180mm 8mm 3000
LM4040C50FTA Commercial SOT23 R5C 7”, 180mm 8mm
LM4040C50QFTA Automotive SOT23 R5C 7”, 180mm 8mm 3000
LM4040C50H5TA Commercial SC70-5 R5C 7”, 180mm 8mm 3000
LM4040D25FTA Commercial SOT23 R2D 7”, 180mm 8mm
LM4040D25H5TA Commercial SC70-5 R2D 7”, 180mm 8mm 3000
LM4040D30FTA Commercial SOT23 R3D 7”, 180mm 8mm
LM4040D30H5TA Commercial SC70-5 R3D 7”, 180mm 8mm 3000
LM4040D50FTA Commercial SOT23 R5D 7”, 180mm 8mm
LM4040D50H5TA Commercial SC70-5 R5D 7”, 180mm 8mm 3000
II
+
RL
.
R
Part
Mark
Reel
Size
Tape
Width
Quantity
per Reel
3000
3000
3000
3000
3000
3000
3000
LM4040
Document number: DS33195 Rev. 5 - 2
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PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Package Outline Dimensions
SOT23
b
3leads
Product Line o
Diodes Incorporated
LM4040
E
e
e1
L1
E1
A
L
A1
c
D
Dim.
Millimeters Inches
Min Max Min Max Min Max Min Max
Dim.
Millimeters Inches
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 0.20 0.003 0.008 L 0.25 0.60 0.0098 0.0236
D 2.80 3.04 0.110 0.120 L1 0.45 0.62 0.018 0.024
e 0.95 NOM 0.037 NOM - - - - -
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
SC70-5
Dim.
Millimeters Inches
Min Max Min Max Min Max Min Max
Dim.
A 0.80 1.10 0.0315 0.0433 E 2.10 BSC 0.0826 BSC
A1 - 0.10 - 0.0039 E1 1.25 BSC 0.0492 BSC
A2 0.80 1.00 0.0315 0.0394 e 0.65 BSC 0.0255 BSC
b 0.15 0.30 0.006 0.0118 e1 1.30 BSC 0.0511 BSC
C 0.08 0.25 0.0031 0.0098 L 0.26 0.46 0.0102 0.0181
D 2.00 BSC 0.0787 BSC a° 0 8 0 8
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
LM4040
Document number: DS33195 Rev. 5 - 2
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Millimeters Inches
© Diodes Incorporated
March 2012
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LM4040
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the
express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause
the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems,
and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related req uirements concerning their products
and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systemsrelated information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and
its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or
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Copyright © 2012, Diodes Incorporated
IMPORTANT NOTICE
LIFE SUPPORT
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LM4040
Document number: DS33195 Rev. 5 - 2
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