ST TSC1031 User Manual
High-voltage, high-side current sense amplifier
t
Features
■ Independent supply and input common-mode
voltages
■ Wide common-mode operating range:
2.9 to 70 V in single-supply configuration
-2.1 to 65 V in dual-supply configuration
■ Wide common-mode surviving range:
-16 to 75 V (reversed battery and load-dump
conditions)
■ Supply voltage range:
2.7 to 5.5 V in single supply configuration
■ Low current consumption: I
■ Pin selectable gain: 50 V/V or 100 V/V
■ Buffered output
■ EMI filtering
Applications
■ Automotive current monitoring
■ DC motor control
■ Photovoltaic systems
■ Battery chargers
■ Precision current sources
■ Current monitoring of notebook computers
■ Uninterruptible power supplies
■ High-end power supplies
Description
The TSC1031 measures a small differential
voltage on a high-side shunt resistor and
translates it into a ground-referenced output
voltage. The TSC1031’s dedicated schematic
eases the implementation of EMI filtering in harsh
environments. The gain is adjustable to 50 V/V or
100 V/V by a selection pin.
max = 360 µA
CC
TSC1031
TSSOP8
(Plastic package)
SO-8
(Plastic package)
Vm
1
A1
2
SEL
3
Ou
4
Pin connections
(top view)
Wide input common-mode voltage range, low
quiescent current, and tiny TSSOP8 packaging
enable use in a wide variety of applications.
The input common-mode and power supply
voltages are independent. The common-mode
voltage can range from 2.9 to 70 V in the singlesupply configuration or be offset by an adjustable
voltage supplied on the Vcc- pin in the dualsupply configuration.
With a current consumption lower than 360 µA
and a virtually null input leakage current in
standby mode, the power consumption in the
applications is minimized.
Vp
8
Vcc-
7
Gnd
6
Vcc+
5
April 2011 Doc ID 16875 Rev 2 1/26
www.st.com
26
Contents TSC1031
Contents
1 Application schematic and pin description . . . . . . . . . . . . . . . . . . . . . . 3
2 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 6
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Electrical characteristics curves: current sense amplifier . . . . . . . . . 10
5 Parameter definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Common mode rejection ratio (CMR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Supply voltage rejection ratio (SVR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.3 Gain (Av) and input offset voltage (V
5.4 Output voltage drift versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.5 Input offset drift versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.6 Output voltage accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
) . . . . . . . . . . . . . . . . . . . . . . . . . . 13
os
6 Maximum permissible voltages on pins . . . . . . . . . . . . . . . . . . . . . . . . 18
7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.1 SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8.2 TSSOP-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
9 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2/26 Doc ID 16875 Rev 2
TSC1031 Application schematic and pin description
1 Application schematic and pin description
The TSC1031 high-side current sense amplifier can be used in either single- or dual-supply
mode. In the single-supply configuration, the TSC1031 features a wide 2.9 V to 70 V input
common-mode range totally independent of the supply voltage. In the dual-supply range,
the common-mode range is shifted by the value of the negative voltage applied on the Vccpin. For instance, with Vcc+ = 5 V and Vcc- = -5 V, then the input common-mode range is
-2.1 V to 65 V.
Figure 1. Single-supply configuration schematic
Vsense
Iload
Common-mode voltage: 2.9 V to 70 V
Rf1
Cf
Vp Vm
Rg1
TSC1031
Rf2
Rg2
Cf
Sense
amplifier
Rg3
A1
Rf3
Vcc
Vol tage
buffer
K2
SEL
Out
5 V
Vcc
GPIO
ADC
GndGndVcc-
µController
AM04523
Doc ID 16875 Rev 2 3/26
Application schematic and pin description TSC1031
Figure 2. Dual-supply configuration schematic
Vsense
Rf1
Cf
Rf2
Iload
Cf
Common-mode voltage: -2.1 V to 65 V
5 V
Vp Vm
Rg1
Rg2
TSC1031
Sense
amplifier
Rg3
A1
Rf3
Vcc
Vol tage
buffer
K2
GndVcc-
SEL
Out
Vcc
GPIO
ADC
Gnd
µController
-5 V
AM04524
4/26 Doc ID 16875 Rev 2
TSC1031 Application schematic and pin description
Figure 3. Common-mode versus supply voltage in dual-supply configuration
Vicm
common-mode voltage
operating range
Max = 70 V
min = 2.9 V
V
= 0 V V
cc-
Max = 65 V
min = -2.1 V
= -5 V
cc-
Max = 60 V
min = -7.1 V
V
= -10 V
cc-
Single-supply Dual-supply
AM04519
Ta bl e 1 describes the function of each pin. Their position is shown in the illustration on the
cover page and in Figure 1 on page 3.
Table 1. Pin description
Symbol Type Function
Out Analog output
Gnd Power supply Ground line.
Vcc+ Power supply Positive power supply line.
Vcc- Power supply Negative power supply line.
Vp Analog input
Vm Analog input
SEL Digital input Gain-select pin.
A1 Analog output Connection to the output resistor.
The Out voltage is 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
Doc ID 16875 Rev 2 5/26
Absolute maximum ratings and operating conditions TSC1031
2 Absolute maximum ratings and operating conditions
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
V
in_sense
V
in_sel
V
in_A1
V
cc+
V
cc+-Vcc-
V
out
T
stg
T
id
Input pins differential voltage (Vp-Vm)±20V
Sensing pins input voltages (Vp, Vm)
Gain selection pin input voltage (SEL)
A1 pin input voltage
Positive supply voltage
(2)
(2)
(1)
(2)
-16 to 75 V
-0.3 to V
-0.3 to V
+0.3 V
cc+
+0.3 V
cc+
-0.3 to 7 V
DC supply voltage 0 to 15 V
DC output pin voltage
(2)
-0.3 to V
+0.3 V
cc+
Storage temperature -55 to 150 °C
Maximum junction temperature 150 °C
j
TSSOP8 thermal resistance junction to ambient 120 °C/W
R
thja
ESD
1. These voltage values are measured with respect to the V
2. These voltage values are measured with respect to the Gnd pin.
3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
4. 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.
5. Charged device model: all pins plus package are charged together to the specified voltage and then
discharged directly to ground.
Table 3. Operating conditions
SO-8 thermal resistance junction to ambient 125 °C/W
HBM: human body model
MM: machine model
(3)
(4)
CDM: charged device model
(5)
cc-
pin.
2.5 kV
150 V
1.5 kV
Symbol Parameter Value Unit
DC supply voltage in single-supply configuration
V
cc+
from T
(V
to T
min
connected to Gnd = 0 V)
cc-
max
Negative supply voltage in dual-supply
V
V
T
cc-
icm
oper
configuration from T
V
= 5.5 V max -8 to 0 V
cc+
= 3 V max -11 to 0 V
V
cc+
Common-mode voltage range referred to pin Vcc (T
min
to T
max
)
Operational temperature range (T
min
to T
max
min
to T
6/26 Doc ID 16875 Rev 2
2.7 to 5.5 V
2.9 to 70 V
) -40 to 125 °C
max
TSC1031 Electrical characteristics
3 Electrical characteristics
The electrical characteristics given in the following tables are measured under the following
test conditions unless otherwise specified.
● T
● V
● Rf1, Rf2 and Rf3 resistors are short-circuited.
Table 4. Supply
Symbol Parameter Test conditions Min. Typ. Max. Unit
=25°C, V
amb
sense=Vp-Vm
cc+
=5V, V
connected to Gnd (single-supply configuration).
cc-
=50mV, Vm= 12 V, no load on Out, all gain configurations.
I
I
CC1
Table 5. Input
Total supply current V
CC
Total supply current
= 0 V, T
sense
= 50 mV Av = 50 V/V
V
sense
< T
T
min
amb
< T
min
max
< T
amb
< T
max
200 360 µA
300 480 µA
Symbol Parameter Test conditions Min. Typ. Max. Unit
DC common-mode rejection
DC CMR
Variation of V
out
referred to input
versus V
(1)
2.9 V< Vm < 70 V, T
icm
min
< T
amb
< T
90 105 dB
max
AC common-mode rejection
AC CMR
Variation of V
versus V
out
referred to input (peak-to-peak
Av = 50 V/V or 100 V/V
icm
2.9 V< V
< 30 V, 1 kHz sine wave
icm
95 dB
voltage variation)
Supply voltage rejection
Variation of V
Input offset voltage
os
/dT Input offset drift vs. T
I
Input leakage current
lk
I
Input bias current
ib
dV
SVR
V
os
versus V
out
(3)
Av = 50 V/V, 2.7 V< VCC < 5.5 V
(2)
V
=30mV, T
T
T
amb
sense
< T
min
=25°C
amb
< T
max
CC
Av = 50 V/V
T
< T
amb
=0V
< T
amb
=0V
< T
amb
< T
< T
< T
max
max
max
V
T
V
T
min
CC
min
sense
min
min
< T
amb
< T
max
85 100 dB
±500
±1100
-20 +5 µV/°C
1µA
10 15 µA
Rg Input resistor value Valid for Rg1 and Rg2 5 kΩ
V
< VCC < V
min
V
V
I
1. See Chapter 5: Parameter definitions on page 13 for the definition of CMR.
2. See Chapter 5 for the definition of SVR.
3. See Chapter 5 for the definition of V
Logic low voltage (SEL)
IL
Logic high voltage (SEL)
IH
Gain-select pins (SEL)
sel
leakage input current
.
os
CC
T
< T
amb
< VCC < V
min
< T
amb
< T
< T
min
V
CC
T
min
SEL pin connected to GND or V
T
< T
amb
< T
min
max
max
max
CC
CC
max
max
CC
-0.3 0.5 V
1.2 V
CC
400 nA
µV
V
Doc ID 16875 Rev 2 7/26
Electrical characteristics TSC1031
Table 6. Output
Symbol Parameter Test conditions Min. Typ. Max. Unit
K1
K2 Current multiplier gain
Av Total gain (Av = 2.K1.K2)
ΔV
out
ΔV
out
ΔV
ΔV
ΔV
ΔV
ΔV
I
sc
V
OH
V
1. See Chapter 5: Parameter definitions on page 13 for the definition of output voltage drift versus temperature.
2. The output voltage accuracy is the difference with the expected theoretical output voltage V
for a more detailed definition.
Except for Av = 100 V/V.
3.
Sense amplifier gain
(K1 = Rg3/Rg1)
/ΔT Output voltage drift vs. T
/ΔI
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
Total output voltage accuracy
out
Short-circuit current
Output stage high-state saturation
voltage
V
OH=VCC-Vout
Output stage low-state saturation
OL
voltage
(1)
SEL= Gnd
SEL= Vcc+
SEL= Gnd
SEL= Vcc+
Av = 50 V/V
T
min
-10 mA < I
sink or source current
I
out
Av = 50 V/V, T
V
(2)
sense
T
amb
T
min
V
sense
T
amb
T
min
V
sense
T
min
V
sense
T
min
V
sense
T
min
OUT connected to V
GND
V
sense
I
out
V
sense
I
out
< T
amb
=50mV
=25°C
< T
amb
=90mV
=25°C
< T
amb
=20mV T
< T
amb
=10mV T
< T
amb
=5mV T
< T
amb
=1V
=1mA
=-1V
=1mA
< T
out
< T
< T
< T
< T
< T
max
<10 mA
= 25° C
amb
(3)
max
(3)
max
amb
max
amb
max
amb
max
=25° C
=25° C
=25°C
or
CC
10
2.5
5
50
100
±240 ppm/°C
0.3 ±1.5 mV/mA
±2.5
±4
±3.5
±5
±3.5
±5
±5.5
±8
±10
±22
15 26 mA
85 135 mV
80 125 mV
out-th
=Av*V
. See Chapter 5
sense
V/V
%
%
%
%
%
8/26 Doc ID 16875 Rev 2
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