ST TS4040 User Manual
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
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
2/9
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
3/9
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