TSC1021
High-side current sense amplifier
Datasheet - production data
Related products
See TSC103 for higher common-mode
operating range (2.9 V to 70 V)
Applications
Automotive current monitoring
Notebook computers
Server power supplies
Telecom equipment
Industrial SMPS
Current sharing
LED current measurement
Features
Wide common-mode operating range
independent of supply: 2.8 V to 30 V
Wide common-mode survival range: -32 V to
60 V (reversed battery and load-dump
conditions)
Maximum input offset voltage:
±1.5 mV for T
amb
= 25 °C
±2.3 mV for -40 °C < T
amb
< 125 °C
Maximum total output voltage error:
±1.5 % for T
amb
= 25 °C
±2.5 % for -40 °C < T
amb
< 125 °C
Maximum variation over temperature:
dV
os
/dT = 8 µV/°C
dV
out
/dT = 100 ppm/°C
Low current consumption: I
CC
max = 300 µA
-40 °C to 125 °C operating temperature
range
Internally fixed gain: 20 V/V, 50 V/V
EMI filtering
Description
The TSC1021 measures a small differential
voltage on a high-side shunt resistor and
translates it into a ground-referenced output
voltage.
The TSC1021 has been specifically designed for
automotive conditions: load-dump protection up
to 60 V, reverse-battery protection up to -32 V,
ESD protection up to 4 kV and internal filtering for
EMI performance.
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 ratings
while the TSC1021 can be supplied by a 5 V
independent supply line.
The TSC1021 is housed in a tiny TSSOP8
package and integrates a buffer that provides low
impedance output to ease interfacing and avoid
accuracy losses. The overall device current
consumption is lower than 300 µA.
November 2015
DocID017857 Rev 4
1/17
www.st.com
This is information on a product in full production.
Contents
TSC1021
Contents
1
2
3
4
5
6
Application diagram ........................................................................ 3
Pin configuration ............................................................................. 4
Absolute maximum ratings and operating conditions ................. 5
Electrical characteristics ................................................................ 6
Electrical characteristics curves: current sense amplifier ........... 8
Parameter definitions .................................................................... 11
6.1
6.2
6.3
6.4
6.5
Common mode rejection ratio (CMR) .............................................. 11
Supply voltage rejection ratio (SVR) ............................................... 11
Gain (Av) and input offset voltage (Vos) ......................................... 11
Output voltage drift versus temperature .......................................... 11
Output voltage accuracy ................................................................. 12
TSSOP8 package information ......................................................... 14
7
8
9
Package information ..................................................................... 13
7.1
Ordering information..................................................................... 15
Revision history ............................................................................ 16
2/17
DocID017857 Rev 4
TSC1021
Application diagram
1
Application diagram
The TSC1021 high-side current-sense amplifier features a 2.8 V 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
CC
).
Figure 1: Application schematic: high-line current sensing
DocID017857 Rev 4
3/17
Pin configuration
TSC1021
2
Pin configuration
Figure 2: Pin connections (top view)
Table 1: "Pin description"
describes the function of each pin. Their position is shown in the
illustration on the cover page and in
Figure 2: "Pin connections (top view)"
above.
Table 1: Pin description
Pin
number
1
3
4
6
8
Symbol
V
m
Gnd
Out
V
CC
V
p
Type
Analog input
Power supply
Analog output
Power supply
Analog input
Function
Connection for the external sense resistor. The
measured current exits the shunt on the
V
m
side.
Ground line
Buffered output of the current sensing amplifier
Positive power supply line
Connection for the external sense resistor. The
measured current enters the shunt on the
V
p
side.
4/17
DocID017857 Rev 4
TSC1021
Absolute maximum
ratings and operating
conditions
3
Absolute maximum ratings and operating conditions
Table 2: Absolute maximum ratings
Symbol
V
id
V
i
V
1
T
stg
T
j
R
thja
Parameter
Input pins differential voltage (V
p
-V
m
)
Current sensing input pin voltages (V
p
and V
m
)
Voltage for Vcc, Out pins
Storage temperature
Maximum junction temperature
TSSOP8 thermal resistance junction to ambient
HBM: human body model for V
p
and V
m
pins
ESD
HBM: human body model for all other pins
MM: machine model
(3)
(4)
(2)
(2)
(1)
(1)
Value
±20
-32 to 60
-0.3 to 7
-65 to 150
150
120
4
2
250
1.5
Unit
V
°C
°C/Ω
kV
V
kV
CDM: charged device model
Notes:
(1)
(2)
Voltage values are measured with respect to the GND pin.
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.
(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 and package are charged together to the specified voltage and then
discharged directly to ground.
Table 3: Operating conditions
Symbol
V
CC
T
oper
V
icm
Parameter
DC supply voltage from T
min
to T
max
Operational temperature range (T
min
to T
max
)
Common-mode voltage range (V
m
and V
p
pin voltage)
Value
3.5 to 5.5
-40 to 125
2.8 to 30
Unit
V
°C
V
DocID017857 Rev 4
5/17
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