ST TS821 User Manual
1.225V micropower shunt voltage reference
Features
■ 1.225V typical output voltage
■ Ultra low operating current: 45μA maximum at
25°C
■ High precision @ 25°C
– +/- 2% (standard version)
– +/- 1% (A grade)
– +/- 0. 5% (B grade)
■ High stability when used with capacitive loads
■ Industrial temperature range: -40°C to +85°C
■ 120ppm/°C maximum temperature coefficient
Applications
■ Computers
■ Instrumentation
■ Battery chargers
■ Switch mode power supply
■ Battery operated equipment
TS821
L
SOT23-3L
(Plastic micropackage)
Pin connections
(Top view)
Description
The TS821 is a low power shunt v oltage referen ce
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 designed in applications where space
saving is critical.
The low operating current is a key adv antage for
power restricted designs. In addition, the TS821 is
very stable and can be used in a broad range of
application conditions.
July 2007 Rev 2 1/9
www.st.com
9
Absolute maximum ratings and operating conditions TS821
1 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings (AMR)
Symbol Parameter Value Unit
Reverse bre akdown current 20 mA
I
k
I
Forward curren t 10 mA
f
Pow er dissipation
P
d
T
Storage temperature -65 to +150 °C
stg
Human body model (HBM)
ESD
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
(1)
SOT23-3
(2)
(3)
= 25°C and Tj = 150°C and R
amb
360 mW
2kV
200 V
= 340°C/W for the SOT23-3L package.
thja
Symbol Parameter Value Unit
I
I
T
Minimum operating current 45 μA
min
Maximum operating current 12 mA
max
Operating free air temperature range -40 to +85 °C
oper
2/9
TS821 Electrical characteristics
2 Electrical characteristics
Table 3. TS821 (2% precision) T
amb
= 25°C
(1)
(unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
Reverse breakdown voltage Ik = 100μA 1.200 1.225 1.250 V
V
k
Reverse breakdown voltage
tolerance
Minimum operating current
/ΔT Average temperature coefficient Ik = 100μA 120 ppm/°C
Reverse breakdown voltage change
/ΔI
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
vh
ΔV
ΔV
I
k-min
ref
k
R
K
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. TS821A (1% precision) T
amb
I
= 100μA
k
-40°C < T
T
= 25°C 40 45
amb
-40°C < T
I
< Ik < 1mA
k-min
-40°C < T
1mA < I
-40°C < T
= 100μA, 10H z < f < 10kHz 200 nV/√Hz
k
= 25°C
(1)
< +85°C
amb
< +85°C 50
amb
< +85°C
amb
< 12mA
k
< +85°C
amb
(unless otherwise specified)
-25
+34
0.3 0.7
2.5 8
+25
+34
1
10
mV
μA
mV
Symbol Parameter Test conditions Min. Typ. Max. Unit
Reverse breakdown voltage Ik = 100μA 1.213 1.225 1.237 V
V
k
Reverse breakdown voltage
tolerance
Minimum operating current
/ΔT Average temperature coefficient Ik = 100μA 120 ppm/°C
Reverse breakdown voltage change
/ΔI
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
vh
ΔV
ΔV
I
k-min
ref
k
R
K
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.
I
= 100μA
k
-40°C < T
T
= 25°C 40 45
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 50
amb
< +85°C
amb
< 12mA
k
< +85°C
amb
-12
-22
+12
+22
0.3 0.7
1
2.5 5
7
mV
μA
mV
3/9
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