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TSC101AILT-TSC101BILT-TSC101CILT
High side current sense amplifier
March 2011 Doc ID 13313 Rev 3 1/18
TSC101High side current sense amplifier
Features Independent supply and input common-mode
voltages Wide common-mode operating range:
2.8 to 30V Wide common-mode surviving range:
-0.3 to 60 V (load-dump) Wide supply voltage range: 4 to 24V Low current consumption: ICC max = 300µA Internally fixed gain: 20 V/V, 50 V/V or 100V/V Buffered output
Applications Automotive current monitoring Notebook computers DC motor controls Photovoltaic systems Battery chargers Precision current sources
DescriptionThe TSC101 measures a small differential voltage
on a high-side shunt resistor and translates it into
a ground-referenced output voltage. The gain is
internally fixed.
Wide input common-mode voltage range, low
quiescent current, and tiny SOT23 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 2.8 to 30 V in operating
conditions and up to 60 V in absolute maximum
rating conditions.
The current consumption below 300 µA and the
wide supply voltage range enable the power
supply to be connected to either side of the
current measurement shunt with minimal error.
Application schematics and pin description TSC1012/18 Doc ID 13313 Rev 3
Application schematics and pin descriptionThe TSC101 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 (VCC).
Figure 1. Application schematicsTable 1 describes the function of each pin. The pin positions are shown in the illustration on
the cover page and in Figure 1 above.
Table 1. Pin descriptions
TSC101 Absolute maximum ratings and operating conditions
Doc ID 13313 Rev 3 3/18 Absolute maximum ratings and operating conditions
Table 2. Absolute maximum ratings Voltage values are measured with respect to the ground pin. 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. 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. Charged device model: all pins plus package are charged together to the specified voltage and then
discharged directly to the ground.
Table 3. Operating conditions
Electrical characteristics TSC101
4/18 Doc ID 13313 Rev 3
3 Electrical characteristics
Table 4. Supply(1) Unless otherwise specified, the test conditions are Tamb= 25°C, VCC =12V, Vsense =Vp-Vm =50mV, Vm=12 V, no load
on Out.
Table 5. Input(1) Unless otherwise specified, the test conditions are Tamb= 25°C, VCC =12V, Vsense =Vp-Vm =50mV, Vm=12 V, no load
on Out. See Section 4.1: Common mode rejection ratio (CMR) on page 11 for the definition of CMR. See Section 4.2: Supply voltage rejection ratio (SVR) on page 11 for the definition of SVR. See Section 4.3: Gain (Av) and input offset voltage (Vos) on page 11 for the definition of Vos.
TSC101 Electrical characteristics
Doc ID 13313 Rev 3 5/18
Table 6. Output(1) Unless otherwise specified, the test conditions are Tamb = 25°C, VCC = 12 V, Vsense = Vp-Vm = 50 mV, Vm = 12 V, no load on
Out. See Output voltage drift versus temperature on page 12 for the definition. Output voltage accuracy is the difference with the expected theoretical output voltage Vout-th = Av*Vsense.
See Output voltage accuracy on page 13 for a more detailed definition.
Electrical characteristics TSC101
6/18 Doc ID 13313 Rev 3
Table 7. Frequency response(1) Unless otherwise specified, the test conditions are Tamb = 25°C, VCC = 12 V, Vsense = Vp-Vm = 50 mV, Vm = 12 V, no load
on Out. For stability purposes, we do not recommend using a greater value of load capacitor.
Table 8. Noise(1) Unless otherwise specified, the test conditions are Tamb = 25°C, VCC = 12 V, Vsense = Vp-Vm = 50 mV, Vm = 12 V, no load
on Out.
TSC101 Electrical characteristics
Doc ID 13313 Rev 3 7/18
3.1 Electrical characteristics curves
For the following curves, the tested device is a TSC101C, and the test conditions are
Tamb= 25°C, VCC = 12 V, Vsense = Vp-Vm = 50 mV , Vm = 12 V , no load on Out unless
otherwise specified.
Figure 2. Supply current vs. supply voltage
(Vsense = 0 V)
Figure 3. Supply current vs. Vsense
Figure 4. Vp pin input bias current vs. V sense Figure 5. Vm pin input bias current vs. V sense
Electrical characteristics TSC101
8/18 Doc ID 13313 Rev 3
Figure 6. Minimum common mode operating
voltage vs. temperature
Figure 7. Output stage low-state saturation
voltage versus output current
(Vsense =-1 V)
Figure 8. Output stage high-state saturation
voltage versus output current sense =+1V)
Figure 9. Output short-circuit source current
versus temperature (Out pin
connected to ground)
TSC101 Electrical characteristics
Doc ID 13313 Rev 3 9/18
Figure 10. Output short-circuit sink current
versus temperature (Out pin
connected to VCC)
Figure 11. Output stage load regulation
Figure 12. Input offset drift versus
temperature
Figure 13. Output voltage drift versus
temperature
Figure 14. Bode diagram (V sense =100mV) Figure 15. Power-supply rejection ratio versus
frequency
