TSC101 High side current sense amplifier Features L Independent supply and input common-mode SOT23-5 voltages (Plastic package) Wide common-mode operating range: 2.8 to 30 V Wide common-mode surviving range: -0.3 to 60 V (load-dump) Wide supply voltage range: 4 to 24 V Low current consumption: I max = 300 A CC Internally fixed gain: 20 V/V, 50 V/V or 100 V/V Pin connections (top view) Buffered output Out 1 5 Vcc Applications Gnd 2 Automotive current monitoring Vp 3 4 Vm Notebook computers DC motor controls Photovoltaic systems The input common-mode and power supply Battery chargers voltages are independent. The common-mode Precision current sources voltage can range from 2.8 to 30 V in operating conditions and up to 60 V in absolute maximum rating conditions. Description The current consumption below 300 A and the The TSC101 measures a small differential voltage wide supply voltage range enable the power on a high-side shunt resistor and translates it into supply to be connected to either side of the a ground-referenced output voltage. The gain is current measurement shunt with minimal error. internally fixed. Wide input common-mode voltage range, low quiescent current, and tiny SOT23 packaging enable use in a wide variety of applications. March 2011 Doc ID 13313 Rev 3 1/18 www.st.com 18Application schematics and pin description TSC101 1 Application schematics and pin description The 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 (V ). CC Figure 1. Application schematics 6 SENSE ) LOAD 6 TO 2 SENSE LOAD 6 6 P M 2G 2G 6 TO 6 2G /UT 6SENSE V X OUT 6 ND - Table 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 Symbol Type Function Output voltage, proportional to the magnitude of the sense voltage Out Analog output V -V . p m Gnd Power supply Ground line V Power supply Positive power supply line CC Connection for the external sense resistor. The measured current V Analog input p enters the shunt on the V side. p Connection for the external sense resistor. The measured current V Analog input m exits the shunt on the V side. m 2/18 Doc ID 13313 Rev 3