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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
Description
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 Tamb = 25 °C
±2.3 mV for -40 °C < Tamb < 125 °C
Maximum total output voltage error:
±1.5 % for Tamb = 25 °C
±2.5 % for -40 °C < Tamb < 125 °C
Maximum variation over temperature:
dVos/dT = 8 µV/°C
dVout/dT = 100 ppm/°C
Low current consumption: ICC max = 300 µA
-40 °C to 125 °C operating temperature
range
Internally fixed gain: 20 V/V, 50 V/V
EMI filtering
November 2015
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.
DocID017857 Rev 4
This is information on a product in full production.
1/17
www.st.com
Contents
TSC1021
Contents
1
Application diagram ........................................................................ 3
2
Pin configuration ............................................................................. 4
3
4
Absolute maximum ratings and operating conditions ................. 5
Electrical characteristics ................................................................ 6
5
Electrical characteristics curves: current sense amplifier ........... 8
6
Parameter definitions .................................................................... 11
7
6.1
Common mode rejection ratio (CMR) .............................................. 11
6.2
Supply voltage rejection ratio (SVR) ............................................... 11
6.3
Gain (Av) and input offset voltage (Vos) ......................................... 11
6.4
Output voltage drift versus temperature .......................................... 11
6.5
Output voltage accuracy ................................................................. 12
Package information ..................................................................... 13
7.1
8
9
2/17
TSSOP8 package information ......................................................... 14
Ordering information..................................................................... 15
Revision history ............................................................................ 16
DocID017857 Rev 4
TSC1021
1
Application diagram
Application diagram
The TSC1021 high-side current-sense amplifier features a 2.8 V to 30 V input commonmode 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
(VCC).
Figure 1: Application schematic: high-line current sensing
DocID017857 Rev 4
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Pin configuration
2
TSC1021
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
4/17
Pin
number
Symbol
Type
1
Vm
Analog input
Connection for the external sense resistor. The
measured current exits the shunt on the Vm side.
3
Gnd
Power supply
Ground line
4
Out
Analog output
Buffered output of the current sensing amplifier
6
VCC
Power supply
Positive power supply line
8
Vp
Analog input
Connection for the external sense resistor. The
measured current enters the shunt on the Vp side.
Function
DocID017857 Rev 4
TSC1021
3
Absolute maximum ratings and operating
conditions
Absolute maximum ratings and operating conditions
Table 2: Absolute maximum ratings
Symbol
Vid
Vi
Parameter
Input pins differential voltage (Vp-Vm)
Voltage for Vcc, Out pins
Tstg
Storage temperature
Rthja
(1)
(1)
-65 to 150
Maximum junction temperature
150
TSSOP8 thermal resistance junction to ambient
HBM: human body model for all other pins
MM: machine model
-32 to 60
(2)
(2)
(3)
CDM: charged device model
V
-0.3 to 7
HBM: human body model for Vp and Vm pins
ESD
Unit
±20
Current sensing input pin voltages (Vp and Vm)
V1
Tj
Value
(4)
°C
°C/Ω
120
4
kV
2
250
V
1.5
kV
Notes:
(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
1.5 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
Parameter
VCC
DC supply voltage from Tmin to Tmax
Toper
Operational temperature range (Tmin to Tmax)
Vicm
Common-mode voltage range (Vm and Vp pin voltage)
DocID017857 Rev 4
Value
Unit
3.5 to 5.5
V
-40 to 125
°C
2.8 to 30
V
5/17
Electrical characteristics
4
TSC1021
Electrical characteristics
The electrical characteristics given in the following tables are measured under the following
test conditions unless otherwise specified: T amb = 25 °C, VCC = 5 V, Vsense = Vp-Vm = 50 mV,
Vm = 12 V, no load on Out, all gain configurations.
Table 4: Supply
Symbol
Parameter
Test conditions
ICC
Total supply current
Vsense = 0 V, -40 °C < Tamb < 125 °C
ICC1
Total supply current
Vsense = 50 mV, -40 °C < Tamb < 125 °C
Min.
Typ.
—
—
Min.
Typ.
90
105
Max.
300
450
Unit
µA
Table 5: Electrical performances
Symbol
Parameter
Test conditions
DC CMR
DC common-mode
rejection, variation of Vout
versus Vm referred to
(1)
input
2.8 V < Vm < 30 V,
-40 °C < Tamb < 125 °C
AC CMR
AC common mode
rejection, variation of Vout
versus Vm referred to input
(peak-to-peak voltage
variation)
2.8 V < Vm < 30 V,
DC to 1 kHz sine wave
Supply voltage rejection,
variation of Vout versus
(1)
VCC
3.5 V < VCC < 5.5 V,
-40 °C< Tamb < 125°C
SVR
Vos
Input offset voltage
(1)
Max.
dB
75
80
Unit
95
2.8 V < Vm < 30 V, Tamb = 25 °C
±1.5
2.8 V < Vm < 30 V,
-40 °C < Tamb < 125 °C
±2.3
mV
dVos/dT
Input offset drift vs. T
-40 °C< Tamb < 125 °C
8
µV/°C
dVout/dT
Output voltage drift vs. T
-40 °C< Tamb < 125 °C
100
ppm/°C
Ilk
Input leakage current
VCC = 0 V, -40 °C < Tamb < 125 °C
1
Iib
Input bias current
Vsense = 0 V, -40 °C < Tamb < 125 °C
7
Av
Gain, (variation of Vout
versus Vsense)
TSC1021A
20
TSC1021B
50
ΔVout
ΔVout/ΔIout
6/17
Total output voltage
(2)
accuracy
Output stage load
regulation
V/V
Vsense = 50 mV, Tamb = 25 °C
±1.5
Vsense = 50 mV, Tmin < Tamb < Tmax
±2.5
Vsense = 100 mV, Tamb = 25 °C
±1.5
Vsense = 100 mV, Tmin < Tamb < Tmax
±2.5
Vsense = 20 mV, Tamb = 25 °C
±7
Vsense = 20 mV, Tmin < Tamb < Tmax
±9
Vsense = 10 mV, Tamb = 25 °C
±12
Vsense = 10 mV, Tmin < Tamb < Tmax
±15
-5 mA < Iout <5 mA,
Iout sink or source current
DocID017857 Rev 4
±0.4
µA
±2
%
mV/mA
TSC1021
Electrical characteristics
Symbol
Voh
Vol
Parameter
Out high level saturation
voltage, Voh=Vcc-Vout
Out low level saturation
voltage
Test conditions
Min.
Vsense = 1 V, Iout = 1 mA,
Tamb = 25 °C
Typ.
Max.
90
135
Vsense = 1 V, Iout = 1 mA,
-40 °C< Tamb < 125 °C
Unit
185
mV
Vsense = -1 V, Iout = 1 mA,
Tamb = 25 °C
80
Vsense = -1 V, Iout = 1 mA,
-40 °C< Tamb < 125 °C
125
165
Notes:
(1)
See Section 6: "Parameter definitions".
(2)
Output voltage accuracy is the difference with the expected theoretical output voltage V out-th = Av x Vsense. See Section 6:
"Parameter definitions" for a more detailed definition.
Table 6: Dynamic performances
Symbol
Parameter
Test conditions
Vout settling to 1 % final value
Vsense = 10 mV to 100 mV,
Cload = 47 pF
SR
Slew rate
Vsense = 10 mV to 100 mV
BW
3 dB bandwidth
eN
Equivalent input noise voltage
ts
Min.
Typ.
Max.
Unit
7
µs
0.45
V/µs
Cload = 47 pF
800
kHz
f = 1 kHz
50
nV/√ Hz
DocID017857 Rev 4
0.3
7/17
Electrical characteristics curves: current sense
amplifier
5
TSC1021
Electrical characteristics curves: current sense
amplifier
Unless otherwise specified, the test conditions for the following curves are:
Tamb = 25 °C, VCC = 5 V, Vsense = Vp - Vm = 50 mV, Vm = 12 V.
No load on the Out pin.
8/17
Figure 3: Output voltage vs. Vsense
Figure 4: Output voltage accuracy vs. Vsense
Figure 5: Supply current vs. supply voltage
Figure 6: Supply current vs. Vsense
Figure 7: Vp pin input current vs. Vsense
Figure 8: Vn pin input current vs. Vsense
DocID017857 Rev 4
TSC1021
Electrical characteristics curves: current sense
amplifier
Figure 9: Output stage low-state saturation voltage vs.
output current (Vsense = -1 V)
Figure 10: Output stage high-state saturation voltage vs.
output current (Vsense = 1 V)
Figure 11: Output stage load regulation
Figure 12: Step response
Figure 13: Bode diagram
Figure 14: Power supply rejection ratio
DocID017857 Rev 4
9/17
Electrical characteristics curves: current sense
amplifier
Figure 15: Noise level
10/17
DocID017857 Rev 4
TSC1021
TSC1021
Parameter definitions
6
Parameter definitions
6.1
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 Vp and Vm. The CMR is referred
back to the input so that its effect can be compared with the applied differential signal. The
CMR is defined by the formula:
6.2
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 VCC. The SVR is referred back to the
input so that its effect can be compared with the applied differential signal. The SVR is
defined by the formula:
6.3
Gain (Av) and input offset voltage (Vos)
The input offset voltage is defined as the intersection between the linear regression of the
Vout vs. the Vsense curve with the X-axis. If Vout1 is the output voltage with Vsense = Vsense1 = 50
mV, and Vout2 is the output voltage with Vsense = Vsense2 = 5 mV, then Vos can be calculated
with the following formula.
6.4
Output voltage drift versus temperature
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 Tmin < Tamb < Tmax.
DocID017857 Rev 4
11/17
Parameter definitions
6.5
TSC1021
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.
The actual value is very slightly different, mainly due to the effects of:
the input offset voltage Vos
the non-linearity
the voltage saturation of VOL and VOH
The output voltage accuracy, expressed as a percentage, can be calculated with the
following formula.
With Av = 20 V/V for TSC1021A and Av = 50 V/V for TSC1021B.
12/17
DocID017857 Rev 4
TSC1021
7
Package information
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
®
®
ECOPACK packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
®
ECOPACK is an ST trademark.
DocID017857 Rev 4
13/17
Package information
7.1
TSC1021
TSSOP8 package information
Figure 16: TSSOP8 package outline
Table 7: TSSOP8 mechanical data
Dimensions
Ref.
Millimeters
Min.
Typ.
A
Max.
Min.
Typ.
1.2
A1
0.05
A2
0.80
b
c
D
2.90
E
E1
Max.
0.047
0.15
0.002
1.05
0.031
0.19
0.30
0.007
0.012
0.09
0.20
0.004
0.008
3.00
3.10
0.114
0.118
0.122
6.20
6.40
6.60
0.244
0.252
0.260
4.30
4.40
4.50
0.169
0.173
0.177
e
14/17
Inches
1.00
0.65
k
0°
L
0.45
0.60
0.006
0.039
0.041
0.0256
8°
0°
0.75
0.018
8°
0.024
L1
1
0.039
aaa
0.1
0.004
DocID017857 Rev 4
0.030
TSC1021
8
Ordering information
Ordering information
Table 8: Order codes
Part number
TSC1021AIPT
TSC1021BIPT
TSC1021AIYPT
TSC1021BIYPT
Temperature range
Package
Packaging
-40 °C to 125 °C
TSSOP8
-40 °C to 125 °C
(1)
automotive grade
Tape and reel
Marking
Gain
O21AI
20
O21BI
50
O21AY
20
O21BY
50
Notes:
(1)
Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening according
to AEC Q001 & Q002 or equivalent.
DocID017857 Rev 4
15/17
Revision history
9
TSC1021
Revision history
Table 9: Document revision history
Date
Revision
23-Sep-2010
1
Initial release
26-Feb-2014
2
Added Section 5: "Electrical characteristics curves: current
sense amplifier".
Updated footnote 1 of Table 8: "Order codes"
3
Added Related products
Replaced Figure 2: Pin connections (top view)
Table 5: Electrical performances: corrected several erroneous
symbols.
Table 8: Order codes: updated “Marking”, updated footnote 1
4
Table 2: "Absolute maximum ratings": updated second "HBM"
parameter.
Table 5: "Electrical performances": updated unit of Vos
parameter from µV to mV.
Table 7: "TSSOP8 mechanical data": updated parameter "aaa"
18-Aug-2014
06-Nov-2015
16/17
Changes
DocID017857 Rev 4
TSC1021
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