TS821
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
Description
The TS821 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 designed in applications where space saving is critical.
The low operating current is a key advantage for power restricted designs. In addition, the TS821 is very stable and can be used in a broad range of application conditions.
L
SOT23-3L
(Plastic micropackage)
Pin connections
(Top view)
July 2007 |
Rev 2 |
1/9 |
www.st.com
Absolute maximum ratings and operating conditions |
TS821 |
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Table 1. |
Absolute maximum ratings (AMR) |
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Symbol |
Parameter |
Value |
Unit |
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|
|
Ik |
Reverse breakdown current |
20 |
mA |
|
If |
Forward current |
10 |
mA |
|
Pd |
Power dissipation(1) SOT23-3 |
360 |
mW |
|
Tstg |
Storage temperature |
-65 to +150 |
°C |
|
ESD |
Human body model (HBM)(2) |
2 |
kV |
|
Machine model (MM)(3) |
200 |
V |
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Tlead |
Lead temperature (soldering, 10 seconds) |
260 |
°C |
1.Pd is calculated with Tamb = 25°C and Tj = 150°C and Rthja = 340°C/W for the SOT23-3L 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. |
Operating conditions |
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Symbol |
Parameter |
Value |
Unit |
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|
|
|
Imin |
Minimum operating current |
45 |
μA |
Imax |
Maximum operating current |
12 |
mA |
Toper |
Operating free air temperature range |
-40 to +85 |
°C |
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TS821 |
Electrical characteristics |
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Table 3. TS821 (2% precision) Tamb = 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 |
Vk |
|
Reverse breakdown voltage |
Ik = 100μA |
-25 |
|
+25 |
mV |
|
|
tolerance |
-40°C < Tamb < +85°C |
+34 |
|
+34 |
|
Ik-min |
Minimum operating current |
Tamb = 25°C |
|
40 |
45 |
μA |
|
-40°C < Tamb < +85°C |
|
|
50 |
||||
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Vref/ |
T |
Average temperature coefficient |
Ik = 100μA |
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|
120 |
ppm/°C |
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|
Ik-min < Ik < 1mA |
|
0.3 |
0.7 |
|
Vk/ |
Ik |
Reverse breakdown voltage change |
-40°C < Tamb < +85°C |
|
|
1 |
mV |
with operating current range |
1mA < Ik < 12mA |
|
2.5 |
8 |
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|
-40°C < Tamb < +85°C |
|
|
10 |
|
Rka |
|
Static impedance |
Ik = 45µA to 1mA |
|
0.25 |
0.5 |
Ω |
Kvh |
|
Long term stability |
Ik = 100μA, t = 1000hrs |
|
120 |
|
ppm |
En |
|
Wide band noise |
Ik = 100μA, 10Hz < f < 10kHz |
|
200 |
|
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. TS821A (1% precision) Tamb = 25°C(1)(unless otherwise specified)
Symbol |
Parameter |
Test conditions |
Min. |
Typ. |
Max. |
Unit |
|
|
|
|
|
|
|
|
|
|
|
Reverse breakdown voltage |
Ik = 100μA |
1.213 |
1.225 |
1.237 |
V |
Vk |
|
Reverse breakdown voltage |
Ik = 100μA |
-12 |
|
+12 |
mV |
|
|
tolerance |
-40°C < Tamb < +85°C |
-22 |
|
+22 |
|
Ik-min |
Minimum operating current |
Tamb = 25°C |
|
40 |
45 |
μA |
|
-40°C < Tamb < +85°C |
|
|
50 |
||||
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|
|
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||
Vref/ |
T |
Average temperature coefficient |
Ik = 100μA |
|
|
120 |
ppm/°C |
|
|
|
Ik-min < Ik < 1mA |
|
0.3 |
0.7 |
|
Vk/ |
Ik |
Reverse breakdown voltage change |
-40°C < Tamb < +85°C |
|
|
1 |
mV |
with operating current range |
1mA < Ik < 12mA |
|
2.5 |
5 |
|||
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|
-40°C < Tamb < +85°C |
|
|
7 |
|
Rka |
|
Static impedance |
Ik = 45μA to 1mA |
|
0.25 |
0.5 |
Ω |
Kvh |
|
Long term stability |
Ik = 100μA, t = 1000hrs |
|
120 |
|
ppm |
En |
|
Wide band noise |
Ik = 100μA 10Hz < f < 10kHz |
|
200 |
|
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