TSC102
High-side current sense amplifier plus signal conditioning amplifier
Datasheet - production data
• Output amplifier for tailor-made signal
conditioning
• -40 °C to 125 °C operating temperature range
• 4 kV ESD protection
Applications
P
TSSOP8
(plastic package)
• Battery chargers
• Automotive current monitoring
• Notebook computers
• DC motor control
• Photo-voltaic systems
• Precision current sources
D
SO8
(plastic package)
• Uninterruptible power supplies
• High-end power supplies
Description
Vm 1
8 Vp
Gnd 2
7 A3
A1 3
6 Vcc
A2 4
5 Out
The TSC102 measures a small differential voltage
on a high-side shunt resistor and translates it into
a ground-referenced output voltage.
The device’s wide input common-mode voltage
range, low quiescent current and tiny TSSOP8
packaging enable use in a wide variety of
applications (also available in SO8 package).
Pin connections
(top view)
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.
Features
• Independent supply and input common-mode
voltages
• Wide common-mode operating range:
2.8 to 30 V
• Wide common-mode surviving range:
-16 to 60 V (reversed battery and load-dump
conditions)
The TSC102 is rugged against abnormal
conditions on the input pins: Vp and Vm can
withstand up to 60 V in case of voltage spikes, as
little as -16 V in case of reversed battery, and up
to 4 kV in case of electrostatic discharge.
In addition to the current sensing amplifier, the
TSC102 offers a fully accessible amplifier for
output signal conditioning. The device’s overall
current consumption is lower than 420 µA.
• Low current consumption: ICC max = 420 µA
January 2014
This is information on a product in full production.
DocID16754 Rev 3
1/23
www.st.com
Contents
TSC102
Contents
1
Application schematic and pin description . . . . . . . . . . . . . . . . . . . . . . 3
2
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Electrical characteristics curves: current sense amplifier . . . . . . . . . . 8
5
Electrical characteristics curves: signal conditioning amplifier . . . . 11
6
Parameter definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.1
Common-mode rejection ratio (CMR) . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.2
Supply voltage rejection ratio (SVR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.3
Gain (Av) and input offset voltage (Vos) . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.4
Output voltage drift versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.5
Output voltage accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8.1
TSSOP8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.2
SO8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
9
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2/23
DocID16754 Rev 3
TSC102
1
Application schematic and pin description
Application schematic and pin description
The TSC102 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 (VCC).
Figure 1. Application schematics
Signal
conditioning
amplifier
Current
sense
amplifier
5V
Vcc
TSC102
6
Vp
Iload
Out
8
Vsense
5
Av=20 V/V
Rsense Vm
1
Gnd
2
A1
3
A2
4
7
A3
Vout
AM04508
Table 1 describes the function of each pin. Their position is shown in the illustration on the
cover page and in Figure 1 above.
Table 1. Pin description
Symbol
Type
Out
Analog output
Gnd
VCC
Power supply
Function
Out voltage is proportional to the magnitude of the sense voltage
Vp-Vm
Ground line
Positive power supply line
Vp
Connection for the external sense resistor. The measured current
enters the shunt on the Vp side
Vm
Connection for the external sense resistor. The measured current
exits the shunt on the Vm side
Analog input
A1
Connection to current sensing amplifier output
A2
Connection to signal conditioning amplifier non-inverting input
A3
Connection to signal conditioning amplifier inverting input
DocID16754 Rev 3
3/23
23
Absolute maximum ratings and operating conditions
2
TSC102
Absolute maximum ratings and operating conditions
Table 2. Absolute maximum ratings
Symbol
Vid
Vi
Parameter
Value
Input pins differential voltage (Vp-Vm)
Current sensing input pin voltages (Vp and Vm)
Voltage for pins A1, A2, A3, Out, Vcc
Tstg
Storage temperature
Tj
Rthja
±20
(1)
(1)
V1
150
TSSOP8 thermal resistance junction to ambient
120
SO8 thermal resistance junction to ambient
125
(3)
CDM: charged device model
4
2.5
MM: machine model(4)
(5)
V
-0.3 to 7
-55 to 150
HBM: human body model for Vm and Vp pins(2)
ESD
-16 to 60
Maximum junction temperature
HBM: human body model
Unit
°C
°C/W
kV
200
V
1.5
kV
1. These voltage values are measured with respect to the GND pin.
2. Human body model for Vm and Vp: a 100 pF capacitor is charged to the specified voltage, then discharged
through a 1.5 kΩ resistor between the Vp or Vm pin and Gnd while the other pins are floating.
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
Symbol
4/23
Parameter
Value
Unit
VCC
DC supply voltage from Tmin to Tmax
3.5 to 5.5
V
Toper
Operational temperature range (Tmin to Tmax)
-40 to 125
°C
Vicm
Common-mode voltage range (Vm pin voltage)
2.8 to 30
V
DocID16754 Rev 3
TSC102
3
Electrical characteristics
Electrical characteristics
Unless otherwise specified, the electrical characteristics given in the following tables have
been measured under the following test conditions.
•
Tamb = 25 °C, VCC = 5 V, Vsense = Vp-Vm = 50 mV, Vm = 12 V.
•
No load on Out pin.
•
Signal conditioning amplifier used as a buffer (pin A3 connected to pin Out and pin A1
connected to pin A2).
Table 4. Supply
Symbol
Parameter
ICC
Total supply current
ICC1
Test conditions
Vsense = 0 V, pin A1 open, pin
A2 shorted to Gnd
Tmin < Tamb < Tmax
Vsense = 50 mV, pin A1
connected to pin A2
Tmin < Tamb < Tmax
Min.
Typ.
Max.
240
420
-
Unit
µA
420
700
Min.
Typ.
Max.
90
100
Table 5. Current sensing amplifier input stage
Symbol
Parameter
Test conditions
DC
CMR1
DC common-mode rejection
Variation of Va1 versus Vicm
referred to input(1)
AC
CMR1
AC common-mode rejection
Variation of Va1 versus Vicm
referred to input (peak-to-peak
voltage variation)
2.8 V< Vm < 30 V
1 kHz sine wave
75
2.8 V < Vm < 30 V
10 kHz sine wave
60
SVR1
Supply voltage rejection
Variation of Va1 versus VCC(2)
3.5 V< VCC < 5.5 V
-40 °C < Tamb < 125 °C
Input offset voltage(3)
Tamb = 25 ° C
-40 °C < Tamb < 125 °C
Input offset drift versus T
-40 °C < Tamb < 125 °C
Ilk
Input leakage current
VCC = 0 V
Tmin < Tamb < Tmax
Iib
Input bias current
Vsense = 0 V
Tmin < Tamb < Tmax
Vos
dVos/dT
2.8 V < Vm < 30 V
-40 °C < Tamb < 150 °C
85
Unit
dB
90
±3
±1.5
±2.3
mV
±8
µV/°C
1
µA
5
7
1. See Section 6: Parameter definitions for the definition of CMR
2. See Section 6 for the definition of SVR
3. See Section 6 for the definition of Vos
DocID16754 Rev 3
5/23
23
Electrical characteristics
TSC102
Table 6. Current sensing amplifier output stage
Symbol
Av
Parameter
Test conditions
Min.
Typ.
Gain
(variation of Va1 versus Vsense)
Max.
20
V/V
A1 node high-level saturation
voltage
Voh1 = Vcc-Va1
Vsense = 1 V
Ia1 = 1 mA
-40 °C< Tamb < 125 °C
85
Vol1
A1 node low-level saturation
voltage
Vsense =-1 V
Ia1 = 1 mA
-40 °C< Tamb < 125 °C
75
Isc1
Short-circuit current
A1 connected to VCC or Gnd
ΔVa1/ΔT
Output voltage drift versus T(1)
Tmin < Tamb < Tmax
ΔVa1/ΔIa1
Output stage load regulation
-5 mA < Ia1< +5 mA
Ia1 sink or source current
ΔVa1
Total output voltage accuracy(2)
Vsense = 50 mV
Tamb = 25 ° C
Tmin < Tamb < Tmax
±2.5
±4
ΔVa1
Total output voltage accuracy(2)
Vsense = 100 mV
Tamb = 25 ° C
Tmin < Tamb < Tmax
±2.5
±4
ΔVa1
Total output voltage accuracy(2)
Vsense = 20 mV
Tamb = 25 ° C
Tmin < Tamb < Tmax
±8
±10
ΔVa1
Total output voltage accuracy(2)
Vsense = 10 mV
Tamb = 25 ° C
Tmin < Tamb < Tmax
±13
±16
Voh1
Unit
185
mV
10
165
30
0.4
mA
±400
ppm/°C
±2
mV/mA
%
1. See Section 6: Parameter definitions for the definition of output voltage drift versus temperature.
2. Output voltage accuracy is the difference with the expected theoretical output voltage Va1-th = Av * Vsense. See Section 6
for a more detailed definition.
Table 7. Current sensing amplifier frequency response
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
Va1 settling to 1% final value
Vsense = 10 mV to 100 mV,
Cload = 47 pF
-
7
-
µs
SR
Slew rate
Vsense = 10 mV to 100 mV
0.2
0.4
-
V/µs
BW
3 dB bandwidth
Cload = 47 pF
-
800
-
kHz
Min.
Typ.
Max.
Unit
-
50
-
nV/√ Hz
ts
Table 8. Current sensing amplifier noise
Symbol
eN
6/23
Parameter
Equivalent input noise voltage
Test conditions
f = 1 kHz
DocID16754 Rev 3
TSC102
Electrical characteristics
Table 9. Signal conditioning amplifier
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
Vicm
Common-mode voltage range
Tmin < Tamb < Tmax
VIO
Input offset voltage
Va2 = 1 V
Tamb = 25 ° C
-40° C < Tamb < 150 °C
Input offset voltage drift
Tmin < Tamb < Tmax
5
µV/°C
Input bias current
Va2 = Va3 = VCC/2
10
pA
Voh2
Output high-level saturation
voltage (Voh2 = VCC-Vout)
Va2 = 1 V Va3 = 0 V Iout = 1 mA
-40° C< Tamb < 125° C
85
185
Vol2
Va2 = 0 V Va3 = 1 V
Output low-level saturation voltage Iout = 1 mA
-40 °C< Tamb < 125 °C
75
165
Isc2
Short-circuit current
ΔVIO
Iib
ΔVout/ΔIout Output stage load regulation
Out connected to VCC or Gnd
0
Vcc
±3.5
±4.5
mV
mV
12
30
-10 mA < Iout < +10 mA
Va2 = 1 V
Iout sink or source current
mA
300
µV/mA
CMR2
DC common-mode rejection
Variation of VIO versus Vicm
Tmin < Tamb < Tmax
0 V
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