TSC101
High 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 60V (load-dump) Wide supply voltage range: 4 to 24V Low current consumption: ICC max = 300µA Internally fixed gain: 20V/V, 50V/V or 100V/V Buffered output L SOT23-5 (Plastic package) Pin connections (top view)
Applications
Out 1
■ ■ ■ ■ ■ ■
5 Vcc
Automotive current monitoring Notebook computers DC motor control Photovoltaic systems Battery chargers Precision current sources
Vp 3 4 Vm Gnd 2
Description
The 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. Input common-mode and power supply voltages are independent. Common-mode voltage can range from 2.8V to 30V in operating conditions and up to 60V in absolute maximum ratings. Current consumption lower than 300µA and wide supply voltage range allow to connect the power supply to either side of the current measurement shunt with minimal error.
October 2007
Rev 2
1/17
www.st.com 17
Application schematics and pin description
TSC101
1
Application schematics and pin description
The TSC101 high-side current-sense amplifier features a 2.8V to 30V input common-mode range that is independent of supply voltage. The main advantage of this feature is to allow high-side current sensing at voltages much greater than the supply voltage (VCC). Figure 1. Application schematics
Vsense 2.8V to 30V Rsense
3 4
Iload
load Vm Rg2
Vp Rg1 4V to 24V
5
VCC
1
Rg3
Out Vout=Av.Vsense
Gnd
2
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.
Symbol Out Gnd VCC Vp Vm
Pin descriptions
Type Analog output Power supply Power supply Analog input Analog input Function The output voltage, proportional to the magnitude of the sense voltage Vp-Vm. Ground line. Positive power supply line. Connection for the external sense resistor. The measured current enters the shunt on the Vp side. Connection for the external sense resistor. The measured current exits the shunt on the Vm side.
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TSC101
Absolute maximum ratings and operating conditions
2
Absolute maximum ratings and operating conditions
Table 2.
Symbol Vid Vi VCC Vout Tstg Tj Rthja ESD
Absolute maximum ratings
Parameter Input pins differential voltage (Vp-Vm) Input pin voltages (Vp and Vm) DC supply voltage
(1) (1)
Value ±60 -0.3 to 60 -0.3 to 25 -0.3 to VCC -55 to 150 150 250 2.5 150
Unit V V V V °C °C °C/W kV V
DC output pin voltage(1) Storage temperature Maximum junction temperature SOT23-5 thermal resistance junction to ambient HBM: human body model(2) MM: machine model
(3)
1. Voltage values are measured with respect to the ground pin. 2. Human body model: A 100pF 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 200pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5Ω). This is done for all couples of connected pin combinations while the other pins are floating.
Table 3.
Symbol VCC Toper Vicm
Operating conditions
Parameter DC supply voltage from Tmin to Tmax Operational temperature range (Tmin to Tmax) Common mode voltage range Value 4.0 to 24 -40 to 125 2.8 to 30 Unit V °C V
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Electrical characteristics
TSC101
3
Table 4.
Symbol ICC
Electrical characteristics
Supply(1)
Parameter Total supply current Test conditions Vsense=0V Tmin < Tamb < Tmax Min. Typ. 165 Max. 300 Unit µA
1. Unless otherwise specified, the test conditions are Tamb=25°C, VCC=12V, Vsense=Vp-Vm=50mV, Vm=12V, no load on Out.
Table 5.
Symbol
Input(1)
Parameter Common mode rejection Variation of Vout versus Vicm referred to input(2) Supply voltage rejection Variation of Vout versus VCC(3) Input offset voltage(4) Input offset drift vs. T Input leakage current Input bias current Test conditions 2.8V< Vicm < 30V Tmin < Tamb < Tmax 4.0V< VCC < 24V Vsense=30mV Tmin < Tamb < Tmax Tamb= 25° C Tmin < Tamb < Tmax Tmin < Tamb < Tmax VCC= 0V Tmin < Tamb < Tmax Vsense= 0V Tmin < Tamb < Tmax 5.5 Min. Typ. Max. Unit
CMR
90
105
dB
SVR
90
105 ±0.2 ±0.9 -3 1 8 ±1.5 ±2.3
dB
Vos dVos/dT Ilk Iib
mV µV/°C µA µA
1. Unless otherwise specified, the test conditions are Tamb=25°C, VCC=12V, Vsense=Vp-Vm=50mV, Vm=12V, no load on Out. 2. See Common mode rejection ratio (CMR) on page 11 for the definition of CMR. 3. See Supply voltage rejection ratio (SVR) on page 11 for the definition of SVR. 4. See Gain (Av) and input offset voltage (Vos) on page 11 for the definition of Vos.
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TSC101 Table 6.
Symbol Av Gain
Electrical characteristics Output(1)
Parameter Test conditions TSC101A TSC101B TSC101C Tamb=25°C Tmin < Tamb < Tmax Tmin < Tamb < Tmax -10mA < Iout
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