ST TS432 User Manual
TS432
1.24 V adjustable shunt voltage reference
Features
■1.24 V typical output voltage
■Ultra low operating current: 60 µA maximum at 25° C
■High precision at 25° C:
+/- 1%
+/- 0.5%
■High stability when used with capacitive loads
■Industrial temperature range: -40° C to +85° C
■100 ppm/°C temperature coefficient
Applications
■Computers
■Instrumentation
■Battery chargers
■Switch mode power supply
■Battery operated equipments
Description
The TS432 is an adjustable low power shunt voltage reference providing an output voltage from 1.24 V to 10 V 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 also a key advantage for power restricted designs. In addition, the TS432 is very stable and can be used in a broad range of application conditions.
L
SOT23-3L
(Plastic micropackage)
Pin connections
(top view)
SOT23-3
Ref
Reference
A
Anode
K
Cathode
April 2008 |
Rev 2 |
1/11 |
www.st.com
Absolute maximum ratings and operating conditions |
TS432 |
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1 Absolute maximum ratings and operating conditions
Table 1. |
Absolute maximum ratings (AMR) |
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Symbol |
Parameter |
Value |
Unit |
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VK |
Cathode voltage |
12 |
V |
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IK |
Cathode current |
-10 to +20 |
mA |
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Iref |
Reference input current |
-0.05 to +3 |
mA |
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Pd |
Power dissipation (1) SOT23-3 |
340 |
mW |
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Rthja |
Thermal resistance junction to ambient for SOT23-3 |
360 |
°C/W |
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Tlead |
Lead temperature (soldering 10 seconds) |
250 |
°C |
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Tstg |
Storage temperature |
-65 to +150 |
°C |
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Tj |
Junction temperature |
150 |
°C |
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ESD |
HBM: human body model |
1.5 |
kV |
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MM: machine model |
150 |
V |
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1. Pd is calculated with Tamb = 25° C, Tj = 150° C and Rthja = 360° C/W.
Table 2. |
Operating conditions |
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Symbol |
Parameter |
Value |
Unit |
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VK |
Cathode voltage |
1.24 to 10 |
V |
IK |
Cathode current |
60µ to 12m |
A |
Tamb |
Ambient temperature |
-40 to +85 |
°C |
2/11
TS432 |
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Electrical characteristics |
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2 |
Electrical characteristics |
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Table 3. |
Tamb = 25°C (unless otherwise specified) |
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Symbol |
Parameter |
Test conditions |
Min. |
Typ. |
Max. |
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Unit |
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IK = 100µA, VK=VREF |
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1.24 |
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Vref |
Reference voltage |
TS432 (1%) |
1.228 |
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1.252 |
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V |
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TS432A (0.5%) |
1.234 |
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1.246 |
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Vref |
Reference voltage tolerance over |
IK = 100µA, VK=VREF |
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7 |
16 |
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mV |
temperature |
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IKmin |
Minimum operating current |
Tamb = 25°C |
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40 |
60 |
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μA |
-40°C < Tamb < +85°C |
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65 |
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IKmin < IK < 1mA |
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0.7 |
1.5 |
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Vref |
Reverse breakdown voltage change with |
-40°C < Tamb < +85°C |
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2 |
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mV |
operating current range |
1mA < IK < 12mA |
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2 |
4 |
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-40°C < Tamb < +85°C |
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6 |
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Vref/ VK |
Reference voltage change with output |
IK = 10mA, VK=10V to VREF |
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1.8 |
2.5 |
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mV/V |
voltage change |
-40°C < Tamb < +85°C |
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3 |
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IK=10mA, R1=10KΩ, |
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50 |
100 |
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Iref |
Reference input current |
R2=+ ∞ |
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nA |
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-40°C < Tamb < +85°C |
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200 |
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IOFF |
Off-state cathode current |
VREF=0, VK=10V |
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1 |
100 |
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nA |
-40°C < Tamb < +85°C |
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150 |
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RKA |
Static impedance |
IK = 100µA to 12mA |
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0.25 |
0.5 |
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W |
KVH |
Long term stability |
IK = 100µA, t = 1000hrs |
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120 |
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ppm |
EN |
Wide band noise |
IK = 100µA |
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200 |
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nV/√Hz |
100Hz < F < 10kHz |
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Note: |
Limits are 100% production tested at 25° C. Behavior over the temperature range is |
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guaranteed through correlation and by design. |
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3/11
Electrical characteristics |
TS432 |
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Figure 1. Reference voltage vs temperature Figure 2. |
Test circuit for VK = Vref |
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1.252 |
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(V) |
1.248 |
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Input |
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Output |
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Voltage |
1.244 |
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VK = VREF |
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Ik |
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IK = 100µA |
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Reference |
1.240 |
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VK |
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1.236 |
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1.232 |
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VREF |
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1.228 |
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-40 |
0 |
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40 |
80 |
120 |
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Temperature (°C) |
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Figure 3. |
Cathode voltage vs cathode current Figure 4. |
Cathode voltage vs cathode current |
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1.5 |
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10 |
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(mA) |
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VK = VREF |
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(V) |
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TAMB=-40°C |
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current |
5 |
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voltage |
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TAMB = +25°C |
1.0 |
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TAMB=+25°C |
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Cathode |
0 |
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Cathode |
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TAMB=+85°C |
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0.5 |
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K |
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K |
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TAMB=+125°C |
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I |
-5 |
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V |
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-10 |
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0.0 |
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-1.0 |
-0.5 |
0.0 |
0.5 |
1.0 |
1.5 |
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0 |
20 |
40 |
60 |
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VK Cathode voltage (V) |
I Cathode current (µA) |
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K |
Figure 5. Reference input current vs |
Figure 6. Static impedance vs temperature |
temperature |
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100 |
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Static impedance (Ohms) |
0.4 |
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Reference current (nA) |
80 |
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IK = 10 mA |
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VK = VREF |
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R |
= 10 KΩ |
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0.3 |
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1 |
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IK |
= 100 µA to 12 mA |
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R = + ∞ |
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2 |
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60 |
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0.2 |
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40 |
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REF |
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KA |
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I |
20 |
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R |
0.1 |
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0 |
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0.0 |
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-40 |
0 |
40 |
80 |
120 |
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-40 |
0 |
40 |
80 |
120 |
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Temperature (°C) |
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Temperature (°C) |
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4/11
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