ST TSC101 User Manual
TSC101
p
t
High side current sense amplifier
Features
■ Independent supply and input common-mode
voltages
■ Wide common-mode operating range:
2.8 to 30 V
■ Wide common-mode surviving range:
-0.3 to 60 V (load-dump)
■ Wide supply voltage range: 4 to 24 V
■ Low current consumption: I
■ Internally fixed gain: 20 V/V, 50 V/V or 100 V/V
■ Buffered output
max = 300 µA
CC
Applications
■ Automotive current monitoring
■ Notebook computers
■ DC motor controls
■ Photovoltaic systems
■ Battery chargers
■ Precision current sources
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.
L
SOT23-5
(Plastic package)
Pin connections
(top view)
1
Ou
2
Gnd
3V
Vcc
5
Vm
4
The input common-mode and power supply
voltages are independent. The common-mode
voltage can range from 2.8 to 30 V in operating
conditions and up to 60 V in absolute maximum
rating conditions.
The current consumption below 300 µA and the
wide supply voltage range enable the power
supply to be connected to either side of the
current measurement shunt with minimal error.
Wide input common-mode voltage range, low
quiescent current, and tiny SOT23 packaging
enable use in a wide variety of applications.
March 2011 Doc ID 13313 Rev 3 1/18
www.st.com
18
Application schematics and pin description TSC101
1 Application schematics and pin description
The TSC101 high-side current sense amplifier features a 2.8 to 30 V input common-mode
range that is independent of the supply voltage. The main advantage of this feature is that it
allows high-side current sensing at voltages much greater than the supply voltage (V
Figure 1. Application schematics
6
TO6
TO6
SENSE
2
SENSE
6
P
2G
6
##
6
2G
M
)
LOAD
LOAD
CC
).
2G
'ND
/UT
6OUT!VX6SENSE
!-
Ta bl e 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. Pin descriptions
Symbol Type Function
Out Analog output
Gnd Power supply Ground line
V
CC
V
p
V
m
Power supply Positive power supply line
Analog input
Analog input
Output voltage, proportional to the magnitude of the sense voltage
.
V
p-Vm
Connection for the external sense resistor. The measured current
enters the shunt on the V
side.
p
Connection for the external sense resistor. The measured current
exits the shunt on the V
side.
m
2/18 Doc ID 13313 Rev 3
TSC101 Absolute maximum ratings and operating conditions
2 Absolute maximum ratings and operating conditions
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
id
V
V
CC
V
out
T
stg
T
j
R
thja
ESD
1. Voltage values are measured with respect to the ground pin.
2. Human body model: a 100 pF 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 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.
4. Charged device model: all pins plus package are charged together to the specified voltage and then
discharged directly to the ground.
Table 3. Operating conditions
Input pins differential voltage (Vp-Vm)±60V
Input pin voltages (Vp and Vm)
i
DC supply voltage
DC output pin voltage
(1)
(1)
(1)
-0.3 to 60 V
-0.3 to 25 V
-0.3 to V
CC
V
Storage temperature -55 to 150 °C
Maximum junction temperature 150 °C
SOT23-5 thermal resistance junction to ambient 250 °C/W
(3)
(2)
(4)
2.5 kV
150 V
1.5 kV
HBM: human body model
MM: machine model
CDM: charged device model
Symbol Parameter Value Unit
V
T
V
CC
oper
icm
DC supply voltage from T
Operational temperature range (T
min
to T
max
min
to T
4.0 to 24 V
) -40 to 125 °C
max
Common mode voltage range 2.8 to 30 V
Doc ID 13313 Rev 3 3/18
Electrical characteristics TSC101
3 Electrical characteristics
Table 4. Supply
(1)
Symbol Parameter Test conditions Min. Typ. Max. Unit
=0V
V
I
1. Unless otherwise specified, the test conditions are T
on Out.
Table 5. Input
Total supply current
CC
(1)
sense
< T
T
min
amb
< T
amb
= 25°C, VCC=12V, V
max
sense=Vp-Vm
165 300 µA
=50mV, Vm= 12 V, no load
Symbol Parameter Test conditions Min. Typ. Max. Unit
Common mode rejection
CMR
Variation of V
referred to input
SVR
V
dV
os
1. Unless otherwise specified, the test conditions are T
on Out.
2. See Section 4.1: Common mode rejection ratio (CMR) on page 11 for the definition of CMR.
3. See Section 4.2: Supply voltage rejection ratio (SVR) on page 11 for the definition of SVR.
4. See Section 4.3: Gain (Av) and input offset voltage (V
Supply voltage rejection
Variation of V
Input offset voltage
os
/dT Input offset drift vs. T T
I
Input leakage current
lk
I
Input bias current
ib
versus V
out
(2)
versus V
out
(4)
icm
CC
(3)
2.8 V < V
< T
T
min
icm
amb
< 30 V
< T
max
4.0 V < VCC < 24 V
=30mV
V
sense
T
< T
< T
amb
max
= 25° C
< T
< T
amb
max
< T
< T
amb
max
= 0 V
< T
< T
amb
max
= 0 V
< T
< T
amb
max
= 25°C, VCC=12V, V
) on page 11 for the definition of Vos.
sense=Vp-Vm
T
T
V
T
V
T
amb
amb
min
min
min
CC
min
sense
min
os
90 105 dB
90 105 dB
±0.2
±0.9
±1.5
±2.3
-3 µV/°C
1µA
5.5 8 µA
=50mV, Vm= 12 V, no load
mV
4/18 Doc ID 13313 Rev 3
TSC101 Electrical characteristics
Table 6. Output
(1)
Symbol Parameter Test conditions Min. Typ. Max. Unit
TSC101A
Av Gain
TSC101B
TSC101C
T
= 25°C
ΔAv Gain accuracy
/ΔT Output voltage drift vs. T
ΔV
out
ΔV
/ΔI
out
ΔV
ΔV
ΔV
ΔV
I
sc-sink
I
sc-source
Output stage load regulation
out
Total output voltage accuracy
out
Total output voltage accuracy
out
Total output voltage accuracy
out
Total output voltage accuracy
out
Short-circuit sink current
Short-circuit source current
(2)
(3)
Output stage high-state saturation
V
V
1. Unless otherwise specified, the test conditions are T
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
See Output voltage accuracy on page 13 for a more detailed definition.
voltage
oh
V
oh=VCC-Vout
Output stage low-state saturation
ol
voltage
amb
T
< T
amb
< T
amb
out
= 50 mV T
< T
amb
= 100 mV T
< T
amb
= 20 mV T
< T
amb
= 10 mV T
< T
amb
= -1 V
< T
< T
<10 mA
< T
< T
< T
< T
max
max
amb
max
amb
max
amb
max
amb
max
CC,
min
T
min
-10 mA < I
I
sink or source current
out
V
sense
T
min
V
sense
T
min
V
sense
T
min
V
sense
T
min
Out connected to V
V
sense
Out connected to Gnd
= 1 V
V
sense
V
= 1 V
sense
= 1 mA
I
out
= -1 V
V
sense
= 1 mA
I
out
amb
= 25°C, V
= 12 V, V
CC
= 25°C
= 25° C
= 25°C
= 25°C
= Vp-Vm = 50 mV, Vm = 12 V, no load on
sense
30 60 mA
15 26 mA
out-th
20
50
100
±2.5
±4.5
0.4 mV/°C
34mV/mA
±2.5
±4.5
±3.5
±5
±8
±11
±15
±20
0.8 1 V
50 100 mV
= Av*V
sense
.
V/V
%
%
%
%
%
Doc ID 13313 Rev 3 5/18
Electrical characteristics TSC101
Table 7. Frequency response
(1)
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
= 10 mV to 100 mV
sense
= 47 pF
C
load
ts Output settling to 1% final value
TSC101A
TSC101B
TSC101C
SR Slew rate V
BW 3dB bandwidth
sense
C
load
V
sense
TSC101A
= 47 pF
TSC101B
TSC101C
1. Unless otherwise specified, the test conditions are T
on Out.
2. For stability purposes, we do not recommend using a greater value of load capacitor.
Table 8. Noise
(1)
amb
= 25°C, V
(2)
3
6
10
= 10 mV to 100 mV 0.55 0.9 V/µs
(2)
= 100 mV
500
670
450
= 12 V, V
CC
= Vp-Vm = 50 mV, Vm = 12 V, no load
sense
Symbol Parameter Test conditions Min. Typ. Max. Unit
Total output voltage noise 50 nV/√ Hz
1. Unless otherwise specified, the test conditions are T
on Out.
amb
= 25°C, V
= 12 V, V
CC
= Vp-Vm = 50 mV, Vm = 12 V, no load
sense
µs
kHz
6/18 Doc ID 13313 Rev 3
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