1.225V micropower shunt voltage reference
Features
■ 1.225V typical output voltage
■ Ultra low operating current: 65µA maximum at
25°C
■ High precision @ 25°C
–+/- 2%
–+/- 1%
– +/- 0. 5%
■ High stability when used with capacitive loads
■ Industrial temperature range: -40°C to +85°C
■ 150ppm/°C maximum temperature coefficient
Application
■ Computers
■ Instrumentation
■ Battery chargers
■ Switch mode power supply
■ Battery operated equipments
TS4041
L
SOT23-3L
(Plastic micropackage)
Pin connections
(Top view)
Description
The TS4041 is a low power shunt voltage
reference providing a stable 1.225V output
voltage over the industrial temperature range
(-40°C to +85°C). Availabe in SOT23-3 surface
mount package, it can be design ed in applications
where space saving is critical.
The low operating current is a key adv antage for
power restricted designs. In addition, the TS4041
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 TS4041
1 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings (AMR)
Symbol Parameter Value Unit
I
I
P
T
stg
ESD
T
lead
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
Reverse breakdown current 20 mA
k
Forward cur rent 10 mA
f
Power dissipation
d
(1)
SOT23-3
360 mW
Storage temperature -65 to +150 °C
(3)
(2)
2kV
200 V
Human body model (HBM)
Machine model (MM)
Lead temperature (soldering, 10 seconds) 260 °C
= 25°C and Tj = 150°C and R
amb
= 340°C/W for the SOT23-3L package.
thja
Symbol Parameter Value Unit
I
I
T
min
max
oper
Minimum operating current 65 μA
Maximum operating current 12 mA
Operating free air temperature range -40 to +85 °C
2/9
TS4041 Electrical characteristics
2 Electrical characteristics
Table 3. TS4041E (2% precision) T
amb
= 25°C
(1)
(unless otherwise specified)
Symbol Parameter Test cond iti on s Min. Typ. Max. Unit
Reverse breakdown voltage Ik = 100μA
V
k
Reverse breakdown voltage tolerance
I
k-min
ΔV
ΔVk/ΔI
R
Minimum operating current
/ΔT Average temperature coefficient Ik = 100μA 150 ppm/°C
ref
Reverse breakdown voltage change
k
with operating current range
Static impedance ΔIk = 45µA to 1mA 0.25 0.5 Ω
ka
K
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. TS4041D (1% precision) T
amb
= 100μA
I
k
-40°C < T
T
amb
-40°C < T
I
k-min
-40°C < T
1mA < I
-40°C < T
= 100μA, 10Hz < f < 10kHz 200 nV/√Hz
k
= 25°C
< +85°C
amb
= 25°C 40 65
< +85°C 70
amb
< Ik < 1mA
< +85°C
amb
< 12mA
k
< +85°C
amb
(1)
(unless otherwise specified)
1.2001.2251.25
0
-25
-36
+25
+36
0.3 2
2.5
2.5 8
10
mV
μA
mV
Symbol Parameter Test cond iti on s Min. Typ. Max. Unit
V
Reverse breakdown voltage Ik = 100μA
V
k
Reverse breakdown voltage tolerance
Minimum operating current
/ΔT Average temperature coefficient Ik = 100μA 150 ppm/°C
ref
Reverse breakdown voltage change
/ΔI
k
k
with operating current range
Static impedance ΔIk = 45μA to 1mA 0.25 0.5 Ω
ka
Long term stability Ik = 100μA, t = 1000hrs 120 ppm
K
vh
ΔV
ΔV
I
k-min
R
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.
Ik = 100μA
-40°C < T
T
= 25°C 40 65
amb
-40°C < T
I
< Ik < 1mA
k-min
-40°C < T
1mA < I
-40°C < T
= 100μA, 10Hz < f < 10kHz 200 nV/√Hz
k
< +85°C
amb
< +85°C 70
amb
< +85°C
amb
< 12mA
k
< +85°C
amb
1.2131.2251.23
7
-12
-25
+12
+25
0.3 2
2.5
2.5 8
10
mV
μA
mV
V
3/9
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