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
TSC101 Electrical characteristics
3.1 Electrical characteristics curves
For the following curves, the tested device is a TSC101C, and the test conditions are
T
= 25°C, V
amb
otherwise specified.
= 12 V, V
CC
= Vp-Vm = 50 mV, Vm = 12 V, no load on Out unless
sense
Figure 2. Supply current vs. supply voltage
(V
Figure 4. Vp pin input bias current vs. V
sense
= 0 V)
sense
Figure 3. Supply current vs. V
sense
Figure 5. Vm pin input bias current vs. V
sense
Doc ID 13313 Rev 3 7/18
Electrical characteristics TSC101
Figure 6. Minimum common mode operating
voltage vs. temperature
Figure 8. Output stage high-state saturation
voltage versus output current
(V
sense
=+1V)
Figure 7. Output stage low-state saturation
voltage versus output current
(V
sense
=-1 V)
Figure 9. Output short-circuit source current
versus temperature (Out pin
connected to ground)
8/18 Doc ID 13313 Rev 3
TSC101 Electrical characteristics
Figure 10. Output short-circuit sink current
versus temperature (Out pin
connected to V
CC
)
Figure 12. Input offset drift versus
temperature
Figure 11. Output stage load regulation
Figure 13. Output voltage drift versus
temperature
Figure 14. Bode diagram (V
=100mV) Figure 15. Power-supply rejection ratio versus
sense
frequency
Doc ID 13313 Rev 3 9/18
Electrical characteristics TSC101
Figure 16. Total output voltage accuracy
versus V
sense
Figure 17. Output voltage versus V
sense
Figure 18. Output voltage versus V
for low V
sense
values)
sense
(detail
Figure 19. Step response
10/18 Doc ID 13313 Rev 3
TSC101 Parameter definitions
4 Parameter definitions
4.1 Common mode rejection ratio (CMR)
The common-mode rejection ratio (CMR) measures the ability of the current-sensing
amplifier to reject any DC voltage applied on both inputs V
back to the input so that its effect can be compared with the applied differential signal. The
CMR is defined by the formula:
ΔV
CMR 20–
------------------------------log⋅=
ΔV
out
icm
4.2 Supply voltage rejection ratio (SVR)
The supply-voltage rejection ratio (SVR) measures the ability of the current-sensing
amplifier to reject any variation of the supply voltage V
input so that its effect can be compared with the applied differential signal. The SVR is
defined by the formula:
Av⋅
and Vm. The CMR is referred
p
. The SVR is referred back to the
CC
ΔV
out
SVR 20–
------------------------------log⋅=
ΔV
CC
Av⋅
4.3 Gain (Av) and input offset voltage (Vos)
The input offset voltage is defined as the intersection between the linear regression of the
V
versus V
out
V
sense=Vsense1
can be calculated with the following formula:
The amplification gain A
voltage:
curve with the X-axis (see Figure 20). If V
sense
=50mV and V
V
os
is defined as the ratio between output voltage and input differential
v
is the output voltage with V
out2
V
sense1
V
⎛⎞
------------------------------------------------
–=
⎝⎠
Av
–
sense1Vsense2
V
–
out1Vout2
V
out
------------------=
V
sense
V
⋅
is the output voltage with
out1
sense=Vsense2
out1
=5mV, then Vos
Doc ID 13313 Rev 3 11/18
Parameter definitions TSC101
Figure 20. V
versus V
out
characteristics: detail for low V
sense
6OUT
6OUT
6OUT
6OS M6
M6
4.4 Output voltage drift versus temperature
6SENSE
sense
values
!-
The output voltage drift versus temperature is defined as the maximum variation of V
out
with
respect to its value at 25°C, over the temperature range. It is calculated as follows:
with T
min
< T
amb
ΔV
-----------------max
ΔT
< T
max
.
out
V
()V
outTamb
--------------------------------------------------------------------------=
T
amb
25° C()–
out
25° C–
Figure 21 provides a graphical definition of output voltage drift versus temperature. On this
chart, V
maximum and minimum variation of V
is always comprised in the area defined by dotted lines representing the
out
versus T.
out
Figure 21. Output voltage drift versus temperature
12/18 Doc ID 13313 Rev 3
TSC101 Parameter definitions
4.5 Output voltage accuracy
The output voltage accuracy is the difference between the actual output voltage and the
theoretical output voltage. Ideally, the current sensing output voltage should be equal to the
input differential voltage multiplied by the theoretical gain, as in the following formula:
V
out-th=Av
The actual value is very slightly different, mainly due to the effects of:
● the input offset voltage V
● non-linearity
. V
sense
os
,
Figure 22. V
out
vs. V
theoretical and actual characteristics
sense
6OUT
M6
!C
TUAL
6OUTACCURACYFOR6
)DEAL
SENSE
M6
6SENSE
!-
The output voltage accuracy, expressed in percentage, can be calculated with the following
formula:
ΔV
out
abs V
--------------------------------------------------------------------------=
out
A
A
V
⋅()–()
v
sense
V
⋅
v
sense
with A
= 20 V/V for TSC101A, Av = 50 V/V for TSC101B and Av = 100 V/V for TSC101C.
v
Doc ID 13313 Rev 3 13/18
Application information TSC101
5 Application information
The TSC101 can be used to measure current and to feed back the information to a
microcontroller, as shown in Figure 23.
Figure 23. Typical application schematic
6
6TO6
SENSE
2
SENSE
)
LOAD
,OAD
6
P
2G 2G
2G
'ND
The current from the supply flows to the load through the R
drop equal to V
sense
across R
inverting input voltage is equal to V
6
M
43#
6
##
!$#
/UT
6
OUT
resistor causing a voltage
. The amplifier input currents are negligible, therefore its
sense
. The amplifier's open-loop gain forces its non-inverting
m
sense
6
##
'ND
6
6
REG
-ICROCONTROLLER
!-
input to the same voltage as the inverting input. As a consequence, the amplifier adjusts
current flowing through Rg1 so that the voltage drop across Rg1 exactly matches V
Therefore, the drop across Rg1 is: V
If I
is the current flowing through Rg1, then I
Rg1
The I
current flows entirely into resistor Rg3 (the input bias current of the buffer is
Rg1
negligible). Therefore, the voltage drop on the R
V
Rg3=Rg3.IRg1
=(Rg3/Rg1).V
Because the voltage across the Rg3 resistor is buffered to the Out pin, V
Rg1=Vsense=Rsense.Iload
Rg1
g3
sense
is given by the formula: I
Rg1=Vsense
resistor can be calculated as follows:
can be
out
sense
.
/Rg1
expressed as:
V
=(Rg3/Rg1).V
out
sense
or V
=(Rg3/R
out
g1).Rsense.Iload
The resistor ratio Rg3/Rg1 is internally set to 20V/V for TSC101A, to 50V/V for TSC101B and
to 100V/V for TSC101C.
The R
resistor and the Rg3/Rg1 resistor ratio (equal to Av) are important parameters
sense
because they define the full scale output range of your application. Therefore, they must be
selected carefully.
14/18 Doc ID 13313 Rev 3
TSC101 Package information
6 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
Figure 24. SOT23-5L package mechanical drawing
Table 9. SOT23-5L package mechanical data
Dimensions
Ref.
Min. Typ. Max. Min. Typ. Max.
A 0.90 1.20 1.45 0.035 0.047 0.057
A1 0.15 0.006
A2 0.90 1.05 1.30 0.035 0.041 0.051
B 0.35 0.40 0.50 0.013 0.015 0.019
C 0.09 0.15 0.20 0.003 0.006 0.008
D 2.80 2.90 3.00 0.110 0.114 0.118
D1 1.90 0.075
e 0.95 0.037
E 2.60 2.80 3.00 0.102 0.110 0.118
F 1.50 1.60 1.75 0.059 0.063 0.069
L 0.10 0.35 0.60 0.004 0.013 0.023
K 0 degrees 10 degrees
Millimeters Inches
Doc ID 13313 Rev 3 15/18
Ordering information TSC101
7 Ordering information
Table 10. Order codes
Part number
TSC101AILT
TSC101BILT O105 50
Temperature
range
Package Packaging Marking Gain
O104 20
-40°C, +125°C SOT23-5 Tape & reel
TSC101CILT O106 100
TSC101AIYLT
TSC101BIYLT
TSC101CIYLT
1. Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001
& Q 002 or equivalent.
(1)
(1)
(1)
-40°C, +125°C
SOT23-5
(Automotive grade)
Tape & reel
O101 20
O102 50
O103 100
16/18 Doc ID 13313 Rev 3
TSC101 Revision history
8 Revision history
Table 11. Document revision history
Date Revision Changes
05-Mar-2007 1 First release, preliminary data.
Document status promoted from preliminary data to datasheet.
22-Oct-2007 2
14-Mar-2011 3
Added test results in electrical characteristics tables.
Added electrical characteristics curves.
Added ESD charged device model values in Table 2: Absolute
maximum ratings.
Added automotive grade qualification in Table 10: Order codes.
Doc ID 13313 Rev 3 17/18
TSC101
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18/18 Doc ID 13313 Rev 3
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