LM4040
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
LM4040
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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. T he devices are available in 0.2% B-grade,
0.5% C-grade and 1% D-grad e 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 compatibl e alternative to the
LM4040 voltage reference.
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) .............. 45µVRMS
• 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 qua lified
Applications
• Battery powered equipment
• Precision power supplies
• Portable instrumentation
• Portable communications devices
• Notebook and palmtop computers
• Data acquisition systems
Pin Assignments
*
Anode
Cathode
Top view
*
Pin 1 must be left floating or connected to pin 2
3
1
2
LM4040 F (SOT23)
Anode
*
Cathode
N/C
N/C
1
2
3
4
5
LM4040 H5 (SC70-5)
Top View
* Pin 2 must be left floating or connected to pin 1
LM4040
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LM4040
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Absolute Maximum Ratings (Voltages to GND Unless Otherw ise Stated)
Parameter Rating Unit
Continuous Reverse Current 20 mA
Continuous For ward Curr ent 10 mA
Operating Junction Temperatu r e -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 rela tive to the ANODE pin.
Package Thermal Data
Package θJA PDIS
TAMB = 25°C, TJ = 150°C
SOT23 380°C/W 330mW
SC70-5 380°C/W 330mW
Recommended Operating Conditions
Min. Max. Units
Reverse Current 0.06 15 mA
Operating Ambient Temperature Range -40 125 °C
LM4040
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LM4040
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Electrical Characteristics (Test conditions: TAMB = 25°C, unless otherwise specified.)
LM4040-2.5
Symbol Parameter Conditions Typ. LM4040
B Limits LM4040
C Limits LM4040
D Limits Units
TAMB
VREF
Reverse breakdown
voltage IR = 100µA 25°C 2.5 V
Reverse breakdown
voltage tolerance IR = 100µA 25°C ±5 ±12 ±25
mV
-40 to +85°C ±21 ±29 ±49
-40 to +125°C ±30 ±38 ±63
IRMIN Minimum operating
current 25°C 45 60 60 65 µA
-40 to +85°C 65 65 70
-40 to +125°C 68 68 73
ΔVR/ΔT Average reverse
breakdown voltage
temperature coefficient
IR = 10mA -40 to +125°C ±20
IR = 1mA ±15 ±100 ±100 ±150 ppm/°C
IR = 100µA ±15
ΔVR/ΔIR Reverse breakdown
change with current
IRMIN IR
< 1mA
25°C 0.3 0.8 0.8 1.0
mV
-40 to +85°C 1.0 1.0 1.2
-40 to +125°C 1.0 1.0 1.2
1mA < IR
< 15mA
25°C 2.5 6.0 6.0 8.0
-40 to +85°C 8.0 8.0 10.0
-40 to +125°C 8.0 8.0 10.0
ZR Dynamic output
impedance IR = 1mA, f = 120Hz
IAC = 0.1IR 0.3 0.8 0.9 1.1 Ω
en Noise voltage IR = 100µA
10Hz < f < 10kHz 35
µVRMS
VR Long term stability (non
cumulative) t = 1000Hrs, IR = 100µA 120 ppm
VHYST Themal hysteresis ΔT = -40°C to =125°C 0.08 %
LM4040
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LM4040
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Electrical Characteristics (cont.) (Test conditions: TAMB = 25°C, unless otherwise specified.)
LM4040-3.0
Symbol Parameter Conditions Typ. LM 4040
B Limits LM4040
C Limits LM4040
D Limits Units
TAMB
VREF
Reverse breakdown
voltage IR = 100µA 25°C 3.0 V
Reverse breakdown
voltage tolerance IR = 100µA 25°C ±6 ±15 ±30
mV
-40 to +85°C ±26 ±34 ±59
-40 to +125°C TBD ±45 ±75
IRMIN Minimum operating
current 25°C 47 62 62 67
µA
-40 to +85°C 67 67 72
-40 to +125°C 70 70 75
ΔVR/ΔT Average reverse
breakdown voltage
temperature coefficient
IR = 10mA -40 to +125°C ±20
IR = 1mA ±15 ±100 ±100 ±150 ppm/°C
IR = 100µA ±15
ΔVR/ΔIR Reverse breakdown
change with current
IRMIN IR
< 1mA
25°C 0.4 0.8 0.8 1.0
mV
-40 to +85°C 1.1 110 1.3
-40 to +125°C 1.1 1.1 1.3
1mA < IR
< 15mA
25°C 2.7 6.0 6.0 8.0
-40 to +85°C 9.0 9.0 11.0
-40 to +125°C 9.0 9.0 11.0
ZR Dynamic output
impedance IR = 1mA, f = 120Hz
IAC = 0.1IR 0.4 0.9 0.9 1.2 Ω
en Noise voltage IR = 100µA
10Hz < f < 10kHz 35
µVRMS
VR Long term stability (non
cumulative) t = 1000Hrs, IR = 100µA 120 ppm
VHYST Themal hysteresis ΔT = -40°C to = 125°C 0.08 %
LM4040
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LM4040
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Electrical Characteristics (cont.) (Test conditions: TAMB = 25°C, unless otherwise specified.)
LM4040-5.0
Symbol Parameter Conditions Typ. LM 4040
B Limits LM4040
C Limits LM4040
D Limits Units
TAMB
VREF
Reverse breakdown
voltage IR = 100µA 25°C 5.0 V
Reverse breakdown
voltage tolerance IR = 100µA 25°C ±10 ±25 ±50
mV
-40 to +85°C ±43 ±58 ±99
-40 to +125°C ±60 ±75 ±125
IRMIN Minimum operating
current 25°C 54 74 74 79
µA
-40 to +85°C 80 80 85
-40 to +125°C 83 83 88
ΔVR/ΔT Average reverse
breakdown voltage
temperature coefficient
IR = 10mA -40 to +125°C ±30
IR = 1mA ±20 ±100 ±100 ±150 ppm/°C
IR = 100µA ±20
ΔVR/ΔIR Reverse breakdown
change with current
IRMIN IR
< 1mA
25°C 0.5 1.0 1.0 1.3
mV
-40 to +85°C 1.4 1.4 1.8
-40 to +125°C 1.4 1.4 1.8
1mA < IR
< 15mA
25°C 3.5 8.0 8.0 10.0
-40 to +85°C 12.0 12.0 15.0
-40 to +125°C 12.0 12.0 15.0
ZR Dynamic output
impedance IR = 1mA, f = 120Hz
IAC = 0.1IR 0.5 1.1 1.1 1.5 Ω
en Noise voltage IR = 100µA
10Hz < f < 10kHz 80
µVRMS
VR Long term stability (non
cumulative) t = 1000Hrs, IR = 100µA 120 ppm
VHYST Themal hysteresis ΔT = -40°C to =125°C 0.08 %
LM4040
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
LM4040
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Typical Characteristics LM4040-2.5
Δ
V (%)
REF
1.00
0.75
-0.75
-1.00
-0.25
-0.50
0.25
0.00
0.50
I = 100µA
R
40 80 120-40 0TE MPERATURE (°C)
Ref erence Voltag e
Tempera t ure Coeffici ent
40 80 120-40 0TEMPERATURE (°C)
Ref erence Voltag e
Tem perat ure Coeff ici ent
Δ
V (
%
)
REF
1.00
0.75
-0.75
-1.00
-0.25
-0.50
0.25
0.00
0.50
I = 1mA
R
10k 100k 1M100 1kFREQUENCY (Hz)
Ref erence Im pedance vs. Fr equenc y
T = 25°C
I = 100µA
A
R
C = 0
L
C = 1.0µF
Tantalum
L
T = 25°C
I = 1mA
A
R
10k 100k 1M100 1k
Z , REFERENCE IMPEDANCE ( )
R
Ω
100
0.01
0.1
1
10
C = 0
L
C = 1.0µF
Tantalum
L
FREQUENCY (Hz)
Ref erence Impe dance vs. Frequ ency
123-1 0FREQUENCY (Hz)
No i s e Volt ag e vs. Fr equen cy
T = 25°C
I = 100µA
A
R
NOISE (nV/ Hz)
√
500
480
340
300
380
360
440
420
460
400
320
123-1 0
V , REVERSE VOLTAGE (V)
Referenc e C ur r ent vs. Voltage
R
I,
R
EVE
R
SE CU
R
R
ENT (µA)
R
500
400
-200
-300
0
-100
200
100
300
T = 25°C
A
LM4040
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LM4040
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Typical Characteristics LM4040-3.0
Δ
V (%)
REF
1.00
0.75
-0.75
-1.00
-0.25
-0.50
0.25
0.00
0.50
I = 100µA
R
40 80 120-40 0TEMPERATURE (°C)
Ref ere nce Vol t age
Tempera tur e Coefficien t
40 80 120-40 0TE MPERATURE (°C)
Refe rence Volt age
Temperature Coefficient
Δ
V (%)
REF
1.00
0.75
-0.75
-1.00
-0.25
-0.50
0.25
0.00
0.50
10k 100k 1M100 1kF REQUENCY (Hz)
Reference Impedance vs. Frequency
T = 25°C
I = 100µA
A
R
C = 0
L
C = 1.0µF
Tantalum
L
10k 100k 1M100 1k
Z
,
R
E
F
E
R
E
N
C
E I
M
P
ED
A
N
C
E ( )
R
Ω
100
0.01
0.1
1
10
FREQUENCY (Hz)
Ref erence Impedance vs. Fre quency
1k 10k 100k10 100
FREQUENCY (Hz)
Noise Voltage vs. Frequency
NOISE (nV/ Hz)
√
650
450
550
600
500
400
12 4-1 0
V , REVERSE VOL TAGE (V)
Reference Current vs. Voltage
R
I,
R
EVE
R
SE CU
R
R
ENT (µA)
R
500
400
-200
-300
0
-100
200
100
300
3
T = 25°C
A
LM4040
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
LM4040
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Typical Characteristics LM4040-5.0
Δ
V (%)
REF
1.00
0.75
-0.75
-1.00
-0.25
-0.50
0.25
0.00
0.50
40 80 120-40 0TE MP ERATURE (°C)
Reference Volt age
Temperat ure Coefficient
40 80 120-40 0TE MP ERATURE (°C)
Ref erence Vol tag e
Temperature Coefficient
Δ
V (
%
)
REF
1.00
0.75
-0.75
-1.00
-0.25
-0.50
0.25
0.00
0.50
I = 1mA
R
10k 100k 1M100 1kFREQUENCY (Hz)
Reference Impedance vs. Fre quency
10k 100k 1M100 1k
Z
,
R
E
F
E
R
E
N
C
E I
M
P
ED
A
N
C
E ( )
R
Ω
100
0.1
1
10
FREQUENCY (Hz)
Referenc e I mpedance vs. Frequency
1k 10k 100k10 100
FREQUENCY (Hz)
Noise Voltage vs. Frequency
NOISE (nV/ Hz)
√
1200
600
400
1000
800
123-1 0 V , REVERSE VOLTAGE (V)
Ref erence Curre nt vs. Voltage
R
I,
R
EVE
R
SE CU
R
R
ENT (µA)
R
500
400
-200
-300
0
-100
200
100
300
T = 25°C
A
456
-400
LM4040
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
LM4040
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Start Up Characteristics LM4040-2.5, 3.0 and 5.0
LM4040-2.5
TIME (s)
Long Pulse Res ponse
I
N
P
U
T
&
O
U
T
P
U
T
V
O
L
T
AG
E
(V)
0µ 2µ 4µ 6µ 8µ 10µ
6
5
4
2
1
0
3
TIME (s)
Short Pulse Response
INPUT &
O
UT PUT V
O
LTAGE (V)
0µ 2µ 4µ 6µ 8µ 10µ
6
5
4
2
1
0
3
Input
Output
T = 25°C
R = 30k
A
S
LM4040-3.0
TIME (s)
Long Puls e Res ponse
INP
U
T
&
O
U
T
P
U
T
V
O
L
T
AGE (V)
0µ 2µ 4µ 6µ 8µ 10µ
7
5
4
2
1
0
3
6
TIME (s)
Short Pulse Response
INPUT &
O
UTPUT V
O
LTAGE (V)
0µ 2µ 4µ 6µ 8µ 10µ
7
5
4
2
1
0
3
6
LM4040-5.0
TIME (s)
Long Pulse Response
IN
P
U
T
&
O
U
T
P
U
T
V
O
L
T
A
G
E (V)
0µ 20µ 40µ 60µ 80µ 100µ
10
4
2
0
6
8
12
TIME (s)
Short Pulse Response
INPUT &
O
UTPUT V
O
LTA
G
E (V)
0µ 2µ 4µ 6µ 8µ 10µ
10
4
2
0
6
8
12
LM4040
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LM4040
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Application Information
In a conventional shunt regulator application (Figure 1), an external series resistor (RS) is connected between the supply
voltage, VS, and the LM4040.
RS determines the current that flows through the load (IL) and the LM4040 (IR). Since load current and
supply voltage ma y vary, RS shou ld be sm all enough to s upply at le ast the minimum acceptabl e IR to the
LM4040 even 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 IL is at its minimum, RS should be large enough so that
the current flowing through the LM4040 is less than 1 5 mA.
RS is determined by the supply voltage, (VS), the load and operating current, (IL and IR), and the
LM4040’s reverse breakdown voltage, VR.
RL
RS
SII VV
R+
−
=
Printed circuit board layout considerations
LM4040s in the SOT23 pack age have the die attached to pin 1, which results in an electrical contact bet ween 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 Voltage
(V) Order Code Qualification† Package Part
Mark Reel
Size Tape
Width Quantity
per Reel
0.2%
2.5 LM4040B25FTA Commercial SOT23 R2B 7”, 180mm 8mm 3000
LM4040B25H5TA Commercial SC70-5 R2B 7”, 180mm 8mm 3000
3.0 LM4040B30FTA Commercial SOT23 R3B 7”, 180mm 8mm 3000
LM4040B30H5TA Commercial SC70-5 R3B 7”, 180mm 8mm 3000
5.0 LM4040B50FTA Commercial SOT23 R5B 7”, 180mm 8mm 3000
LM4040B50H5TA Commercial SC70-5 R5B 7”, 180mm 8mm 3000
0.5%
2.5 LM4040C25FTA Commercial SOT23 R2C 7”, 180mm 8mm 3000
LM4040C25H5TA Commercial SC70-5 R2C 7”, 180mm 8mm 3000
3.0 LM4040C30FTA Commercial SOT23 R3C 7”, 180mm 8mm 3000
LM4040C30H5TA Commercial SC70-5 R3C 7”, 180mm 8mm 3000
5.0 LM4040C50FTA Commercial SOT23 R5C 7”, 180mm 8mm 3000
LM4040C50QFTA Automotive SOT23 R5C 7”, 180mm 8mm 3000
LM4040C50H5TA Commercial SC70-5 R5C 7”, 180mm 8mm 3000
1%
2.5 LM4040D25FTA Commercial SOT23 R2D 7”, 180mm 8mm 3000
LM4040D25H5TA Commercial SC70-5 R2D 7”, 180mm 8mm 3000
3.0 LM4040D30FTA Commercial SOT23 R3D 7”, 180mm 8mm 3000
LM4040D30H5TA Commercial SC70-5 R3D 7”, 180mm 8mm 3000
5.0 LM4040D50FTA Commercial SOT23 R5D 7”, 180mm 8mm 3000
LM4040D50H5TA Commercial SC70-5 R5D 7”, 180mm 8mm 3000
RS
VS
IR +
IL
IR
IL
VR
LM4040
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LM4040
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Package Outline Dimensions
SOT23
E
e
L
e1
D
A
c
E1
L1
A1
b
3leads
Dim. Millimeters Inches Dim. Millimeters Inches
Min Max Min Max Min Max Min 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 0.20 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 Dim. Millimeters Inches
Min Max Min Max Min Max Min Max
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
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LM4040
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