ST TS432 User Manual
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
TS432
L
SOT23-3L
(Plastic micropackage)
Pin connections
(top view)
■ 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 k ey adv antage
for power restricted designs. In addition, the
TS432 is very stable and can be used in a broad
range of application conditions.
SOT23-3
Ref
Reference
A
Anode
K
Cathode
April 2008 Rev 2 1/11
www.st.com
11
Absolute maximum ratings and operating conditions TS432
1 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings (AMR)
Symbol Parameter Value Unit
V
I
P
R
T
T
Cathode voltage 12 V
K
I
Cathode current -10 to +20 mA
K
Reference input current -0.05 to +3 mA
ref
Power dissipation
d
Thermal resistance junction to ambient for SOT23-3 360 °C/W
thja
Lead temperature (soldering 10 seconds) 250 °C
lead
Storage temperature -65 to +150 °C
stg
T
Junction temperature 150 °C
j
(1)
SOT23-3
340 mW
HBM: human body model 1.5 kV
ESD
MM: machine model 150 V
1. Pd is calculated with T
Table 2. Operating conditions
= 25° C, Tj = 150° C and R
amb
= 360° C/W.
thja
Symbol Parameter Value Unit
V
T
Cathode voltage 1.24 to 10 V
K
Cathode current 60µ to 12m A
I
K
Ambient temperature -40 to +85 °C
amb
2/11
TS432 Electrical characteristics
2 Electrical characteristics
Table 3. T
= 25°C (unless otherwise specified)
amb
Symbol Parameter Test conditions Min. Typ. Max. Unit
= 100µA, VK=V
I
K
V
Reference voltage
ref
REF
1.24
TS432A (0.5%) 1.234 1.246
Reference voltage tolerance over
ref
temperature
Minimum operating current
Reverse breakdown voltage change with
ref
operating current range
Reference voltage change with output
/ΔV
K
voltage change
Reference input current
ref
Off-state cathode current
Static impedance ΔIK = 100µA to 12mA 0.25 0.5 W
KA
Long term stability IK = 100µA, t = 1000hrs 120 ppm
VH
Wide band noise
N
= 100µA, VK=V
I
K
T
= 25°C 40 60
amb
-40°C < T
I
Kmin
-40°C < T
1mA < I
-40°C < T
= 10mA, VK=10V to V
I
K
-40°C < T
=10mA, R1=10KΩ,
I
K
R2=+
-40°C < T
V
REF
-40°C < T
= 100µA
I
K
amb
< IK < 1mA 0.7 1.5
amb
< 12mA 2 4
K
amb
amb
∞
amb
=0, VK=10V 1 100
amb
REF
< +85°C 65
< +85°C 2
< +85°C 6
REF
< +85°C 3
< +85°C 200
< +85°C 150
100Hz < F < 10kHz
716mV
1.8 2.5
50 100
200 nV/√Hz
ΔV
ΔV
I
Kmin
ΔV
ref
I
I
OFF
R
K
E
VTS432 (1%) 1.228 1.252
μA
mV
mV/V
nA
nA
Note: Limits are 100% production tested at 25° C. Behavior over the temperature range is
guaranteed through correlation and by design.
3/11
Electrical characteristics TS432
Figure 1. Reference voltage vs temperature Figure 2. Test circuit for VK = V
ref
1.252
1.248
1.244
VK = V
REF
IK = 100µA
Input
Output
Ik
1.240
V
K
1.236
Reference Volt age (V)
V
1.232
1.228
-40 0 40 80 120
REF
Temperature (°C)
Figure 3. Cathode voltage vs cathode current Figure 4. Cathode voltage vs cathode current
10
VK = V
5
T
AMB
REF
= +25°C
0
Cathode current (mA)
K
I
-5
1.5
T
=-40°C
AMB
1.0
T
=+25°C
AMB
T
=+85°C
AMB
Cathode voltage (V)
K
0.5
V
T
AMB
=+125°C
-10
-1.0 -0.5 0.0 0.5 1.0 1.5
VK Cathode voltage (V)
Figure 5. Reference input current vs
temperature
100
80
60
40
Reference current (nA)
REF
I
20
0
-40 0 40 80 120
Temperature (°C)
IK = 10 mA
= 10 KΩ
R
1
R2 = + ∞
0.0
0 204060
IK Cathode current (µA)
Figure 6. Static impedance vs temperature
0.4
VK = V
0.3
0.2
Static impedance (Ohms)
KA
R
0.1
0.0
-40 0 40 80 120
Temperature (°C)
REF
IK = 100 µA to 12 mA
4/11
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