TS4040
2.5V micropower shunt voltage reference
Features
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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
L
SOT23-3L
(Plastic micropackage)
Applications
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Computers
Instrumentation
Battery chargers
Switch mode power supply
Battery operated equipments
Pin connections
(Top view)
Description
The TS4040 is a low power shunt voltage
reference providing a stable 2.5V output voltage
over the industrial temperature range (-40°C to
+85°C). Available in SOT23-3 surface mount
package, it can be designed in applications where
space saving is critical.
The low operating current is a key advantage for
power restricted designs. In addition, the TS4040
is very stable and can be used in a broad range of
application conditions.
August 2007
Rev 2
1/9
www.st.com
9
Absolute maximum ratings and operating conditions
TS4040
1
Absolute maximum ratings and operating conditions
Table 1.
Symbol
I
k
I
f
P
d
T
stg
ESD
Absolute maximum ratings (AMR)
Parameter
Reverse breakdown current
Forward current
Power dissipation
(1)
SOT23-3
Storage temperature
Human body model (HBM)
(2)
Machine model (MM)
(3)
Value
20
10
360
-65 to +150
2
200
260
Unit
mA
mA
mW
°C
kV
V
°C
T
lead
Lead temperature (soldering, 10 seconds)
1. Pd is calculated with T
amb
= 25°C, T
junction
=150°C and R
thja
= 340°C/W for the SOT23-3 package.
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.
Symbol
I
k-min
I
k-max
T
oper
Operating conditions
Parameter
Minimum operating current
Maximum operating current
Operating free air temperature range
Value
65
15
-40 to +85
Unit
μA
mA
°C
2/9
TS4040
Electrical characteristics
2
Table 3.
Symbol
Electrical characteristics
TS4040E (2% precision) T
amb
= 25°C
(1)
(unless otherwise specified)
Parameter
Reverse breakdown voltage
V
k
Reverse breakdown voltage tolerance
Minimum operating current
Average temperature coefficient
Test conditions
I
k
= 100μA
I
k
= 100μA
-40°C < T
amb
< +85°C
T = 25°C
-40°C < T
amb
< +85°C
I
k
= 100μA
I
k-min
< I
k
< 1mA
-40°C < T
amb
< +85°C
1mA < I
k
< 15mA
-40°C < T
amb
< +85°C
I
k
= I
k-min
to 1mA
-40°C < T
amb
< +85°C
I
k
= 1 to 15mA
-40°C < T
amb
< +85°C
Long term stability
Wide band noise
I
k
= 100μA, t = 1000hrs
I
k
= 100μA 10Hz < f < 10kHz
Min.
2.45
-50
-74
40
30
0.4
2.5
0.4
0.2
120
35
Typ.
2.5
Max.
2.55
50
74
65
70
150
1
1.2
mV
8
10
1
1.2
0.6
0.7
Unit
V
mV
μA
ppm/°C
I
k-min
ΔV
ref
/ΔT
ΔV
k
/ΔI
k
Reverse breakdown voltage change
with operating current range
R
ka
Reverse static impedance
Ω
K
vh
En
ppm
nV/√Hz
1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and
by design.
Table 4.
Symbol
TS4040D (1% precision) T
amb
= 25°C
(1)
(unless otherwise specified)
Parameter
Reverse breakdown voltage
Test conditions
I
k
= 100μA
I
k
= 100μA
-40°C < T
amb
< +85°C
T = 25°C
-40°C < T
amb
< +85°C
I
k
= 100μA
I
k-min
< I
k
< 1mA
-40°C < T
amb
< +85°C
1mA < I
k
< 15mA
-40°C < T
amb
< +85°C
I
k
= I
k-min
to 1mA
-40°C < T
amb
< +85°C
I
k
= 1mA to 15mA
-40°C < T
amb
< +85°C
Long term stability
Wide band noise
I
k
= 100μA, t = 1000hrs
I
k
= 100μA 10Hz < f < 10kHz
Min.
2.475
-25
-49
40
30
0.4
2.5
0.4
0.2
120
35
Typ.
2.5
Max.
2.525
25
49
65
70
150
1
1.2
mV
8
10
1
1.2
0.6
0.7
Unit
V
mV
μA
ppm/°C
V
k
Reverse breakdown voltage tolerance
Minimum operating current
Average temperature coefficient
I
k-min
ΔV
ref
/ΔT
ΔV
k
/ΔI
k
Reverse breakdown voltage change
with operating current range
R
ka
Reverse static impedance
Ω
K
vh
En
ppm
nV/√Hz
1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and
by design.
3/9
Electrical characteristics
TS4040
Figure 1.
Reference voltage versus cathode
current
Figure 2.
Minimum operating current
Reference voltage versus cathode current
15
3
2.5
Minimum operating current
Cathode current (mA)
10
Cathode voltage (V)
T=+25°C
2
1.5
1
0.5
5
T=+85°C
T=-40°C
0
-5
-0.5
0
0.5
1
1.5
2
2.5
Cathode voltage (V)
0
0
20
Cathode current (µA)
40
Figure 3.
Test circuit
Figure 4.
2.58
Reference voltage versus
temperature
Test circuit
Cathode voltage (V)
R
Ik=(Vin-Vref)/R
Vout=Vref
2.56
2.54
2.52
+2%
+1%
2.5
2.48
2.46
2.44
2.42
-40
Vin
-1%
-2%
-20
0
20
40
60
80
Temperature (°C)
Figure 5.
Static impedance R
ka
versus
temperature
Static impedance (Rka) versus
temperature
Figure 6.
Noise voltage versus frequency
Noise voltage versus Frequency
1500
Noise voltage (nV/VHz)
C
L
=100µF
C
L
=10µF
1000
C
L
=1µF
500
C
L
=100nF
C
L
=0
0
1000.0
100.0
Frequency (KHz)
0.2
Static impedance (Ohms)
0.15
0.1
0.05
0
-40
-20
0
20
40
60
80
0.1
1.0
10.0
Temperature (°C)
4/9
TS4040
Electrical characteristics
Figure 7.
Test circuit for pulse response at
I
k
=100µA
Figure 8.
Pulse response for I
k
=100µA
Pulse response for Ik=100µA
Test circuit for pulse response at Ik=100µA
25k ohm
Ik=100µA
Input
Output
Pulse
Generator
0
2.5
Output
0
0
5
10
Time (µs)
15
20
5
Figure 9.
Intput
Test circuit for pulse response at
I
k
=100µA (detailed part)
Pulse response for Ik=100µA
Detailed part
5V
Input
Figure 10. Test circuit for pulse response at
I
k
=100µA (detailed part)
Pulse response for Ik=100µA
Detailed part
5V
Input
0V
Output
0V
0
0.5
1
Time (µs)
1.5
2
2.5V
2.5V
Output
0V
0V
0
1
2
3
4
5
Time (µs)
Figure 11. Test circuit for pulse response at
I
k
=1mA
Figure 12. Pulse response at I
k
=1mA
Pulse response for Ik=1mA
Test circuit for pulse response at Ik=1mA
2.5k ohm
Ik=1mA
0V
2.5V
0V
Output
5V
Input
Output
Intput
Pulse
Generator
0
1
2
3
4
5
Time (µs)
5/9
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