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%
L
SOT23-3L
(Plastic micropackage)
■
■
■
High stability when used with capacitive loads
Industrial temperature range: -40° C to +85° C
100 ppm/°C temperature coefficient
Pin connections
(top view)
Applications
■
■
■
■
■
Computers
Instrumentation
Battery chargers
Switch mode power supply
Battery operated equipments
K
Cathode
Ref
Reference
SOT23-3
A
Anode
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.
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.
Symbol
V
K
I
K
I
ref
P
d
R
thja
T
lead
T
stg
T
j
ESD
MM: machine model
1. P
d
is calculated with T
amb
= 25° C, T
j
= 150° C and R
thja
= 360° C/W.
Absolute maximum ratings (AMR)
Parameter
Cathode voltage
Cathode current
Reference input current
Power dissipation
(1)
SOT23-3
Thermal resistance junction to ambient for SOT23-3
Lead temperature (soldering 10 seconds)
Storage temperature
Junction temperature
HBM: human body model
Value
12
-10 to +20
-0.05 to +3
340
360
250
-65 to +150
150
1.5
150
Unit
V
mA
mA
mW
°C/W
°C
°C
°C
kV
V
Table 2.
Symbol
V
K
I
K
T
amb
Operating conditions
Parameter
Cathode voltage
Cathode current
Ambient temperature
Value
1.24 to 10
60µ to 12m
-40 to +85
Unit
V
A
°C
2/11
TS432
Electrical characteristics
2
Table 3.
Symbol
Electrical characteristics
T
amb
= 25°C (unless otherwise specified)
Parameter
Test conditions
I
K
= 100µA, V
K
=V
REF
V
ref
Reference voltage
TS432 (1%)
TS432A (0.5%)
ΔV
ref
I
Kmin
Reference voltage tolerance over
temperature
Minimum operating current
I
K
= 100µA, V
K
=V
REF
T
amb
= 25°C
-40°C < T
amb
< +85°C
I
Kmin
< I
K
< 1mA
ΔV
ref
Reverse breakdown voltage change with -40°C < T
amb
< +85°C
operating current range
1mA < I
K
< 12mA
-40°C < T
amb
< +85°C
0.7
1.228
1.234
7
40
Min.
Typ.
1.24
1.252
1.246
16
60
65
1.5
2
mV
2
4
6
1.8
2.5
mV/V
3
50
100
nA
200
1
100
nA
150
0.25
120
200
0.5
W
ppm
nV/√Hz
mV
μA
V
Max.
Unit
ΔV
ref
/ΔV
K
Reference voltage change with output
voltage change
I
K
= 10mA, V
K
=10V to V
REF
-40°C < T
amb
< +85°C
I
K
=10mA, R
1
=10KΩ,
R
2
=+
∞
-40°C < T
amb
< +85°C
I
ref
Reference input current
I
OFF
R
KA
K
VH
E
N
Off-state cathode current
Static impedance
Long term stability
Wide band noise
V
REF
=0, V
K
=10V
-40°C < T
amb
< +85°C
ΔI
K
= 100µA to 12mA
I
K
= 100µA, t = 1000hrs
I
K
= 100µA
100Hz < F < 10kHz
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.
1.252
1.248
1.244
1.240
Reference voltage vs temperature
Figure 2.
Test circuit for V
K
= V
ref
Reference Voltage (V)
Input
V
K
= V
REF
I
K
= 100µA
Output
Ik
V
K
1.236
1.232
1.228
-40
V
REF
0
40
Temperature (°C)
80
120
Figure 3.
10
I
K
Cathode current (mA)
Cathode voltage vs cathode current Figure 4.
1.5
V
K
Cathode voltage (V)
Cathode voltage vs cathode current
5
V
K
= V
REF
T
AMB
= +25°C
T
AMB
=-40°C
1.0
T
AMB
=+25°C
T
AMB
=+85°C
0.5
T
AMB
=+125°C
0
-5
-10
-1.0
-0.5
0.0
0.5
1.0
1.5
0.0
0
20
40
60
V
K
Cathode voltage (V)
I
K
Cathode current (µA)
Figure 5.
100
Reference input current vs
temperature
Figure 6.
0.4
Static impedance vs temperature
80
I
K
= 10 mA
R
1
= 10 K
Ω
R
2
= +
∞
R
KA
Static impedance (Ohms)
I
REF
Reference current (nA)
0.3
V
K
= V
REF
I
K
= 100 µA to 12 mA
60
0.2
40
0.1
20
0
-40
0
40
Temperature (°C)
80
120
0.0
-40
0
40
Temperature (°C)
80
120
4/11
TS432
Electrical characteristics
Figure 7.
150
I
OFF
Off-State current (nA)
Off-state current vs temperature
Figure 8.
Test circuit for off-state current
measurement
Input
100
V
REF
= 0 V
V
K
= 10 V
V
K
=10V
I
OFF
50
0
-40
0
40
Temperature (°C)
80
120
Figure 9.
Ratio of change in reference input
voltage to change in V
K
voltage vs
temperature
Figure 10. Test circuit for V
KA
> V
REF
Ratio of change in Reference input voltage (mV/V)
3
Input
V
K
I
K
2
I
K
= 10 mA
V
K
= 10V to V
REF
R1
I
REF
1
R2
V
REF
0
-40
0
40
Temperature (°C)
80
120
V
K
= V
REF
. (1+R1/R2) + I
REF
. R1
Figure 11. Phase and gain vs frequency
60
Gain
T
AMB
= +25°C
180
Figure 12. Test circuit for phase and gain
measurement
5V
40
Gain (dB)
120
23.5 kΩ
Phase (Degree)
22 µF
Phase
20
60
1 µF
33 kΩ
Output
0
2
10
10
3
10
4
10
5
10
6
0
Input
33 kΩ
Frequency (Hz)
5/11
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