TSC101
High side current sense amplifier
Features
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Independent supply and input common-mode
voltages
Wide common-mode operating range:
2.8 to 30V
Wide common-mode surviving range:
-0.3 to 60V (load-dump)
Wide supply voltage range: 4 to 24V
Low current consumption: I
CC
max = 300µA
Internally fixed gain: 20V/V, 50V/V or 100V/V
Buffered output
L
SOT23-5
(Plastic package)
Pin connections
(top view)
Applications
Out 1
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5 Vcc
Automotive current monitoring
Notebook computers
DC motor control
Photovoltaic systems
Battery chargers
Precision current sources
Vp 3
4 Vm
Gnd 2
Description
The TSC101 measures a small differential voltage
on a high-side shunt resistor and translates it into
a ground-referenced output voltage. The gain is
internally fixed.
Wide input common-mode voltage range, low
quiescent current, and tiny SOT23 packaging
enable use in a wide variety of applications.
Input common-mode and power supply voltages
are independent. Common-mode voltage can
range from 2.8V to 30V in operating conditions
and up to 60V in absolute maximum ratings.
Current consumption lower than 300µA and wide
supply voltage range allow to connect the power
supply to either side of the current measurement
shunt with minimal error.
October 2007
Rev 2
1/17
www.st.com
17
Application schematics and pin description
TSC101
1
Application schematics and pin description
The TSC101 high-side current-sense amplifier features a 2.8V to 30V input common-mode
range that is independent of supply voltage. The main advantage of this feature is to allow
high-side current sensing at voltages much greater than the supply voltage (V
CC
).
Figure 1.
Application schematics
V
sense
2.8V to
30V
R
sense
3
4
I
load
load
V
m
Rg2
V
p
Rg1
4V to 24V
5
V
CC
1
Rg3
Out
V
out
=Av.V
sense
Gnd
2
Table 1
describes the function of each pin. The pin positions are shown in the illustration on
the cover page and in
Figure 1
above.
Table 1.
Symbol
Out
Gnd
V
CC
V
p
V
m
Pin descriptions
Type
Analog output
Power supply
Power supply
Analog input
Analog input
Function
The output voltage, proportional to the magnitude of the sense
voltage V
p
-V
m
.
Ground line.
Positive power supply line.
Connection for the external sense resistor. The measured current
enters the shunt on the V
p
side.
Connection for the external sense resistor. The measured current
exits the shunt on the V
m
side.
2/17
TSC101
Absolute maximum ratings and operating conditions
2
Absolute maximum ratings and operating conditions
Table 2.
Symbol
V
id
V
i
V
CC
V
out
T
stg
T
j
R
thja
ESD
Absolute maximum ratings
Parameter
Input pins differential voltage (V
p
-V
m
)
Input pin voltages (V
p
and V
m
)
(1)
DC supply voltage
(1)
DC output pin voltage
(1)
Storage temperature
Maximum junction temperature
SOT23-5 thermal resistance junction to ambient
HBM: human body model
(2)
MM: machine model
(3)
Value
±60
-0.3 to 60
-0.3 to 25
-0.3 to V
CC
-55 to 150
150
250
2.5
150
Unit
V
V
V
V
°C
°C
°C/W
kV
V
1. Voltage values are measured with respect to the ground pin.
2. Human body model: A 100pF capacitor is charged to the specified voltage, then discharged through a
1.5kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
3. Machine model: A 200pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5Ω). This is done for all couples of
connected pin combinations while the other pins are floating.
Table 3.
Symbol
V
CC
T
oper
V
icm
Operating conditions
Parameter
DC supply voltage from T
min
to T
max
Operational temperature range (T
min
to T
max
)
Common mode voltage range
Value
4.0 to 24
-40 to 125
2.8 to 30
Unit
V
°C
V
3/17
Electrical characteristics
TSC101
3
Table 4.
Symbol
I
CC
Electrical characteristics
Supply
(1)
Parameter
Total supply current
Test conditions
V
sense
=0V
T
min
< T
amb
< T
max
Min.
Typ.
165
Max.
300
Unit
µA
1. Unless otherwise specified, the test conditions are T
amb
=25°C, V
CC
=12V, V
sense
=V
p
-V
m
=50mV, V
m
=12V, no load on Out.
Table 5.
Symbol
Input
(1)
Parameter
Common mode rejection
Variation of V
out
versus V
icm
referred to input
(2)
Supply voltage rejection
Variation of V
out
versus V
CC(3)
Input offset voltage
(4)
Input offset drift vs. T
Input leakage current
Input bias current
Test conditions
2.8V< V
icm
< 30V
T
min
< T
amb
< T
max
4.0V< V
CC
< 24V
V
sense
=30mV
T
min
< T
amb
< T
max
T
amb
= 25° C
T
min
< T
amb
< T
max
T
min
< T
amb
< T
max
V
CC
= 0V
T
min
< T
amb
< T
max
V
sense
= 0V
T
min
< T
amb
< T
max
5.5
Min.
Typ.
Max.
Unit
CMR
90
105
dB
SVR
90
105
±0.2
±0.9
-3
1
8
±1.5
±2.3
dB
V
os
dV
os
/dT
I
lk
I
ib
mV
µV/°C
µA
µA
1. Unless otherwise specified, the test conditions are T
amb
=25°C, V
CC
=12V, V
sense
=V
p
-V
m
=50mV, V
m
=12V, no load on Out.
2. See
Common mode rejection ratio (CMR) on page 11
for the definition of CMR.
3. See
Supply voltage rejection ratio (SVR) on page 11
for the definition of SVR.
4. See
Gain (Av) and input offset voltage (V
os
) on page 11
for the definition of V
os
.
4/17
TSC101
Table 6.
Symbol
Av
Gain
Electrical characteristics
Output
(1)
Parameter
Test conditions
TSC101A
TSC101B
TSC101C
T
amb
=25°C
T
min
< T
amb
< T
max
T
min
< T
amb
< T
max
-10mA < I
out
<10mA
I
out
sink or source current
V
sense
=50mV T
amb
=25° C
T
min
< T
amb
< T
max
V
sense
=100mV T
amb
=25° C
T
min
< T
amb
< T
max
V
sense
=20mV T
amb
=25° C
T
min
< T
amb
< T
max
V
sense
=10mV T
amb
=25° C
T
min
< T
amb
< T
max
Out connected to V
CC,
V
sense
=-1V
Out connected to Gnd
V
sense
=1V
V
sense
=1V
I
out
=1mA
V
sense
=-1V
I
out
=1mA
30
15
60
26
0.4
3
4
±2.5
±4.5
±3.5
±5
±8
±11
±15
±20
Min.
Typ.
20
50
100
±2.5
±4.5
Max.
Unit
V/V
ΔAv
ΔV
out
/ΔT
Gain accuracy
Output voltage drift vs. T
(2)
%
mV/°C
mV/mA
%
%
%
%
mA
mA
ΔV
out
/ΔI
out
Output stage load regulation
ΔV
out
ΔV
out
ΔV
out
ΔV
out
I
sc-sink
I
sc-source
Total output voltage accuracy
(3)
Total output voltage accuracy
Total output voltage accuracy
Total output voltage accuracy
Short-circuit sink current
Short-circuit source current
Output stage high-state saturation
voltage
V
oh
=V
CC
-V
out
Output stage low-state saturation
voltage
V
oh
0.8
1
V
V
ol
50
100
mV
1. Unless otherwise specified, the test conditions are T
amb
=25°C, V
CC
=12V, V
sense
=V
p
-V
m
=50mV, V
m
=12V, no load on Out.
2. See
Output voltage drift versus temperature on page 12
for the definition.
3. Output voltage accuracy is the difference with the expected theoretical output voltage V
out-th
=Av*V
sense
. See
Output voltage
accuracy on page 13
for a more detailed definition.
5/17
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