ST TSC1021 User Manual
Features
■ Wide common-mode operating range
independent of supply: 2.8 to 30 V
■ Wide common-mode surviving range:
-32 to 60 V (reversed battery and load-dump
conditions)
■ Maximum input offset voltage:
– ±1.5 mV for T
– ±2.3 mV for -40
■ Maximum total output voltage error:
– ±1.5% for T
– ±2.5% for -40°C < T
■ Maximum variation over temperature:
–dV
–dV
■ Low current consumption: I
■ -40 to 125°C operating temperature range
■ Internally fixed gain: 20 V/V, 50 V/V
■ EMI filtering
/dT = 8 µV/°C
os
/dT = 100 ppm/°C
out
amb
amb
= 25°C
°C < T
= 25°C
amb
< 125°C
amb
< 125°C
max = 300 µA
CC
Applications
■ Automotive current monitoring
■ Notebook computers
■ Server power supplies
■ Telecom equipment
■ Industrial SMPS
■ Current sharing
■ LED current measurement
TSC1021
High-side current sense amplifier
TSSOP8
(Plastic package)
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 to
deal with 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.
September 2010 Doc ID 17857 Rev 1 1/12
www.st.com
12
Application diagram TSC1021
1 Application diagram
The TSC1021 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 schematic: high-line current sensing
Vsense
Iload
Common-mode range
R
sense
CC
).
Supply voltage
Vcc
Rg3
Gnd
Vp
Rg1
Vm
Rg2
Out
V
out
= Av.V
sense
AM06135
2/12 Doc ID 17857 Rev 1
TSC1021 Pin configuration
2 Pin configuration
Figure 2. Pin connections (top view)
Vm
NC
Gnd
Out
1
2
3
4
Vp
8
NC
7
Vcc
6
NC
5
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 above.
A1
Table 1. Pin description
Pin number Symbol Type Function
1V
m
Analog input
3 Gnd Power supply Ground line
4 Out Analog output Buffered output of the current sensing amplifier
6V
8V
CC
p
Power supply Positive power supply line
Analog input
Connection for the external sense resistor. The
measured current exits the shunt on the V
side.
m
Connection for the external sense resistor. The
measured current enters the shunt on the V
side.
p
Doc ID 17857 Rev 1 3/12
Absolute maximum ratings and operating conditions TSC1021
3 Absolute maximum ratings and operating conditions
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
id
V
V
1
T
stg
T
R
thja
ESD
1. Voltage values are measured with respect to the GND 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 and package are charged together to the specified voltage and then
discharged directly to ground.
Table 3. Operating conditions
Input pins differential voltage (Vp-Vm)±20V
Current sensing input pin voltages (Vp and Vm)
i
Voltage for Vcc, Out pins
(1)
(1)
-32 to 60 V
-0.3 to 7 V
Storage temperature -65 to 150 °C
Maximum junction temperature 150 °C
j
TSSOP8 thermal resistance junction to ambient 120 °C/W
HBM: human body model for V
HBM: human body model
MM: machine model
CDM: charged device model
(2)
(3)
(4)
and Vm pins
p
(2)
4kV
2kV
250 V
1.5 kV
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
Common mode voltage range (Vm and Vp pins
voltages)
4/12 Doc ID 17857 Rev 1
3.5 to 5.5 V
) -40 to 125 °C
max
2.8 to 30 V
Loading...