Page 1
2.5V micropower shunt voltage reference
Features
■ 2.5V output voltage
■ Ultra low current consumption: 40µA typ.
■ High precision @ 25°C: ±2% and ±1%
■ High stability when used with capacitive loads
■ Industrial temperature range:-40°C to +85°C
■ 150ppm/°C maximum temperature coefficient
Applications
■ Computers
■ Instrumentation
■ Battery chargers
■ Switch mode power supply
■ Battery operated equipments
TS4040
L
SOT23-3L
(Plastic micropackage)
Pin connections
(Top view)
Description
The TS4040 is a low power shunt voltage
reference providing a stable 2.5V output voltage
over the industrial tem perature range (-40°C to
+85°C). Available in SOT23-3 surface mount
package, it can be designed in applicat ions where
space saving is critical.
The low operating current is a key adv antage for
power restricted designs. In addition, the TS4040
is very stable and can be used in a broad ran ge of
application conditions.
August 2007 Rev 2 1/9
www.st.com
9
Page 2
Absolute maximum ratings and operating conditions TS4040
1 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings (AMR)
Symbol Parameter Value Unit
Reverse breakdown current 20 mA
I
k
I
Forward current 10 mA
f
= 25°C, T
amb
(1)
SOT23-3
(3)
(2)
=150°C and R
junction
360 mW
2kV
200 V
= 340°C/W for the SOT23-3 package.
thja
Power dissipation
P
d
T
Storage temperature -65 to +150 °C
stg
ESD Human body model (HBM)
Machine model (MM)
T
1. Pd is calculated with T
2. Human body model: 100pF discharged through a 1.5kΩ resistor between two pins of the device, done for
all couples of pin combinations with other pins floating.
3. Machine model: a 200pF cap is charged to the specified voltage, then discharged directly between two pins
of the device with no external series resistor (internal resistor < 5Ω), done for all couples of pin
combinations with other pins floating.
Table 2. Operating conditions
Lead temperature (soldering, 10 seconds) 260 °C
lead
Symbol Parameter Value Unit
I
k-min
I
k-max
T
Minimum operating current 65 μA
Maximum operating current 15 mA
Operating free air temperature range -40 to +85 °C
oper
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Page 3
TS4040 Electrical characteristics
2 Electrical characteristics
Table 3. TS4040E (2% precision) T
amb
= 25°C
(1)
(unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
Reverse breakdown voltage Ik = 100μA 2.45 2.5 2.55 V
V
k
Reverse breakdown voltage tolerance
ΔV
ΔV
I
k-min
ref
R
K
Minimum operating current
/ΔT Average temperature coefficient Ik = 100μA 30 150 ppm/°C
Reverse breakdown voltage change
/ΔI
k
k
with operating current range
Reverse static impedance
ka
Long term stability Ik = 100μA, t = 1000hrs 120 ppm
vh
En Wide band noise I
1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and
by design.
Table 4. TS4040D (1% precision) T
amb
I
= 100μA
k
-40°C < T
amb
< +85°C
T = 25°C
-40°C < T
I
< Ik < 1mA
k-min
-40°C < T
1mA < I
-40°C < T
I
= I
k
k-min
-40°C < T
= 1 to 15mA
I
k
-40°C < T
= 100μA 10Hz < f < 10kHz 35 nV/√Hz
k
= 25°C
< +85°C
amb
< +85°C
amb
< 15mA
k
< +85°C
amb
to 1mA
< +85°C
amb
< +85°C
amb
(1)
(unless otherwise specified)
-50
-74
50
74
40
65
70
0.4 1
1.2
2.5 8
10
0.4 1
1.2
0.2 0.6
0.7
mV
μA
mV
Ω
Symbol Parameter Test conditions Min. Typ. Max. Unit
Reverse breakdown voltage Ik = 100μA 2.475 2.5 2.525 V
V
k
Reverse breakdown voltage tolerance
ΔV
ΔV
I
k-min
ref
R
K
Minimum operating current
/ΔT Average temperature coefficient Ik = 100μA 30 150 ppm/°C
Reverse breakdown voltage change
/ΔI
k
k
with operating current range
Reverse static impedance
ka
Long term stability Ik = 100μA, t = 1000hrs 120 ppm
vh
En Wide band noise I
1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and
by design.
= 100μA
I
k
-40°C < T
amb
< +85°C
T = 25°C
-40°C < T
I
< Ik < 1mA
k-min
-40°C < T
1mA < I
-40°C < T
I
= I
k
k-min
-40°C < T
= 1mA to 15mA
I
k
-40°C < T
= 100μA 10Hz < f < 10kHz 35 nV/√Hz
k
< +85°C
amb
< +85°C
amb
< 15mA
k
< +85°C
amb
to 1mA
< +85°C
amb
< +85°C
amb
-25
-49
25
49
40
0.4
65
70
1
1.2
2.5 8
10
0.4 1
1.2
0.2 0.6
0.7
mV
μA
mV
Ω
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Page 4
Electrical characteristics TS4040
Figure 1. Reference voltage versus cathode
Figure 2. Minimum operating current
current
Reference voltage versus cathode current
15
10
5
0
Cathode current (mA)
-5
-0.5 0 0.5 1 1.5 2 2.5
Cathode voltage (V)
Cathode voltage (V)
Minimum operating current
3
2.5
2
1.5
1
0.5
0
02040
T=+25°C
T=+85°C
T=-40°C
Cathode current (µA)
Figure 3. Test circuit Figure 4. Reference voltage versus
temperature
2.58
+2%
+1%
-1%
-2%
Temperature (°C)
Vin
R
Test circuit
Ik=(Vin-Vref)/R
Vout=Vref
2.56
2.54
2.52
2.5
2.48
Cathode voltage (V)
2.46
2.44
2.42
-40 -20 0 20 40 6 0 80
Figure 5. Static impedance Rka versus
temperature
Static impedance (Rka) versus
temperature
0.2
0.15
0.1
0.05
Static impedance (Ohms)
0
-40-200 20406080
Temperature (°C)
4/9
Figure 6. Noise voltage versus frequency
Noise voltage versus Frequency
1500
CL=100µF
1000
500
Noise voltage (nV/VHz)
0
0.1
CL=10µF
1.0
Frequency (KHz)
10.0
CL=1µF
CL=100nF
CL=0
1000.0
100.0
Page 5
TS4040 Electrical characteristics
Figure 7. Test circuit for pulse response at
I
=100µA
k
Test circuit for pulse response at Ik=100µA
25k ohm
Ik=100µA
Pulse
Generator
Intput
Figure 9. Test circuit for pulse response at
I
=100µA (detailed part)
k
Pulse response for Ik=100µA
Detailed part
5V
Input
Figure 8. Pulse response for I
=100µA
k
Pulse response for Ik=100µA
5
Input
0
2.5
Output
0
0 5 10 15 20
Time (µs)
Output
Figure 10. Test circuit for pulse response at
Ik=100µA (detailed part)
Pulse response for Ik=100µA
Detailed part
5V
0V
Output
0V
00.511.52
Time (µs)
2.5V
Figure 11. Test circuit for pulse response at
I
=1mA
k
Test circuit for pulse response at Ik=1mA
2.5k ohm
Ik=1mA
Pulse
Generator
Intput
Input
2.5V
012345
Output
Time (µs)
Figure 12. Pulse response at I
Pulse response for Ik=1mA
5V
0V
2.5V
Output
0V
012345
Time (µs)
Input
Output
=1mA
k
0V
0V
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Page 6
Package information TS4040
Figure 13. Test circuit for pulse response at
I
=1mA (detailed part)
k
Pulse response for Ik=1mA
Detailed part
5V
Input
0V
Output
0V
0 50 100 150 200
Time (ns)
2.5V
3 Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in
ECOPACK
category of second level interconnect is marke d on the pa ckage and on the inner box label,
in compliance with JEDEC Standard JESD97. The maximum ratings related t o soldering
conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics
trademark. ECOPACK specifications are available at: www.st.com
®
packages. These packages have a lead-free second level interconnect. The
Figure 14. Test circuit for pulse response at
Ik=1mA (detailed part)
Pulse response for Ik=1mA
Detailed part
5V
Input
2.5V
Output
0 0.2 0.4 0.6 0.8 1
Time (µs)
0V
0V
.
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TS4040 Package information
Figure 15. SOT23-3 package mechanical data
Dimensions
Ref.
Millimeters Mils
Min. Typ. Max. Min. Typ. Max.
A 0.890 1.120 35.05 44.12
A1 0.010 0.100 0.39 3.94
A2 0.880 0.950 1.020 34.65 37.41 40.17
b 0.300 0.500 11.81 19.69
C 0.080 0.200 3.15 7.88
D 2.800 2.900 3.040 110.26 114.17 119.72
E 2.100 2.64 82.70 103.96
E1 1.200 1.300 1.400 47.26 51.19 55.13
e 0.950 37.41
e1 1.900 74.82
L 0.400 0.600 15.75 23.63
L1 0.540 21.27
k0°8°0°8°
7110469/A
7/9
Page 8
Ordering information TS4040
4 Ordering information
Table 5. Order codes
Part number Precision
TS4040EILT-2.5 2%
TS4040DILT-2.5 1% L242
5 Revision history
Table 6. Document revision history
Date Revision Changes
14-Mar-2002 1 Initial release.
20-Aug-2007 2
Temperature
range
-40°C to +85°C SOT23-3 Tape & reel
Removed TO-92 package information.
Format update.
Package Packing Marking
L243
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Page 9
TS4040
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