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TSC101
High side current sense amplifier
Target Specification
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 28V Low current consumption: ICC max = 300A 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
Battery chargers Automotive current monitoring Notebook computers DC motor control 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 300A and wide supply voltage range allow to connect the power supply to either side of the current measurement shunt with minimal error.
March 2007
Rev 1
1/18
www.st.com 18
This is preliminary information on a new product foreseen to be developed. Details are subject to change without notice.
Contents
TSC101
Contents
1 2 3 4 Application schematic and pin description . . . . . . . . . . . . . . . . . . . . . . 3 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Parameter definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Common mode rejection ratio (CMR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Supply voltage rejection ratio (SVR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Gain (Av) and input offset voltage (Vos) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output voltage drift versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Output voltage accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Output voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 6 7 8
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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TSC101
Application schematic and pin description
1
Application schematic 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 schematic
Vsense 2.8V to 30V Rsense
3 4
Iload
load Vm Rg2
Vp Rg1
5
VCC
1
Rg3
Out Vout=Av.Vsense
Gnd
2
Table 1 below describes the function of each pin. Their position is shown in the illustration on the cover page and in Figure 1 above. Table 1.
Symbol Out Gnd VCC Vp Vm
Pin description
Type Analog output Power supply Power supply Analog input Analog input Function The OUT voltage is 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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Absolute maximum ratings and operating conditions
TSC101
2
Absolute maximum ratings and operating conditions
Table 2.
Symbol Vid Vi VCC Vout Tstg Tj ESD(2)
Absolute maximum ratings
Parameter Input pins differential voltage (Vp-Vm) Input pin voltages (Vp, Vm) DC supply voltage
(1) (1)
Value 60 -0.3 to 60 -0.3 to 30 -0.3 to 28 -55 to 150 150 2 200
Unit V V V V C C kV V
DC output pin voltage(1) Storage temperature Maximum junction temperature Human body model (HBM) Machine model (MM)
1. Voltage values are measured with respect to the GND pin. 2. ESD test for each couple of pins.
Table 3.
Symbol VCC Toper Rthja
Operating conditions
Parameter DC supply voltage from Tmin to Tmax Operational temperature range (Tmin to Tmax) SOT23-5 thermal resistance junction to ambient Value 4.0 to 28 -40 to 125 250 Unit V C C/W
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TSC101
Electrical characteristics
3
Electrical characteristics
The electrical characteristics given in the following tables are measured under the following test conditions unless otherwise specified: Tamb=25C, VCC=12V, Vsense=Vp-Vm=50mV, Vm=12V, no load on Out
Table 4.
Symbol ICC
Supply
Parameter Total supply current Test conditions Vsense = 0 Tmin < Tamb < Tmax Min. Typ. Max. 300 Unit A
Table 5.
Symbol Vicm
Input
Parameter Common mode voltage range Test conditions Tmin < Tamb < Tmax 2.8V< Vicm < 30V Tmin < Tamb < Tmax 2.8V< Vicm < 30V 1kHz sine wave 2.8V< Vicm < 30V 10kHz sine wave 4.0V< VCC < 28V 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 0 90 Min. 2.8 90 105 Typ. Max. 30 Unit V dB
DC common mode rejection DC CMR Variation of Vout versus Vicm referred to input(1) AC common mode rejection versus Vicm AC CMR Variation of Vout referred to input (peak-to-peak voltage variation) Supply voltage rejection Variation of Vout versus VCC(2) Input offset voltage(3) Input offset drift vs. T Input leakage current Input bias current
95 80
dB dB
SVR
105 0.2 0.9 1.5 2.3 4.5 1 8
dB
Vos dVos/dT Ilk Iib
mV V/C A A
1. See Section 4: Parameter definitions on page 8 for the definition of CMR. 2. See Section 4: Parameter definitions on page 8 for the definition of SVR. 3. See Section 4: Parameter definitions on page 8 for the definition of Vos.
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Electrical characteristics Table 6.
Symbol Av Gain
TSC101
Output
Parameter Test conditions TSC101A TSC101B TSC101C Tamb=25C Tmin < Tamb < Tmax Tmin < Tamb < Tmax -10mA < Iout <1 0mA Iout sink or source current Vsense=10mV Tamb=25 C Tmin < Tamb < Tmax Vsense=20mV Tamb=25 C Tmin < Tamb < Tmax Vsense=50mV Tamb=25 C Tmin < Tamb < Tmax Vsense=100mV Tamb=25 C Tmin < Tamb < Tmax OUT connected to VCC or GND Vsense=1V Iout=1mA Vsense=-1V Iout=1mA 15 40 -600 -300 2 Min. Typ. 20 50 100 3 5 0 tbd tbd tbd tbd tbd tbd tbd tbd tbd Max. Unit V/V
Av Vout/T
Gain accuracy Output voltage drift vs. T(1)
% V/C mV/mA %
Vout/Iout Output stage load regulation Vout Total output voltage accuracy(2)
Vout
Total output voltage accuracy
%
Vout
Total output voltage accuracy
%
Vout
Total output voltage accuracy
%
Isc
Short-circuit current Output stage high-state saturation voltage VOH=VCC-Vout Output stage low-state saturation voltage
mA
VOH
0.8
1
V
VOL
50
100
mV
1. See Section 4: Parameter definitions on page 8 for the definition of output voltage drift versus temperature. 2. Output voltage accuracy is the difference with the expected theoretical output voltage Vout-th=Av*Vsense. See Section 4: Parameter definitions on page 8 for a more detailed definition.
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TSC101 Table 7.
Symbol
Electrical characteristics Frequency response
Parameter Test conditions Vsense=10mV to 100mV, Cload=47pF Min. Typ. Max. Unit
ts
Output settling to 1% final value
TSC101A TSC101B TSC101C
3 6 10 0.55 0.9
s s s V/s
SR
Slew rate
Vsense=10mV to 100mV Cload=47pF Vicm=12V Vsense=100mV
BW
3dB bandwidth
TSC101A TSC101B TSC101C
650 710 540
kHz kHz kHz
Table 8.
Symbol
Noise
Parameter Total output voltage noise Test conditions Min. Typ. 50 Max. Unit nV/ Hz
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Parameter definitions
TSC101
4
Parameter definitions
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:
V out CMR = - 20 log -----------------------------V icm Av
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:
V out SVR = - 20 log ----------------------------V CC Av
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TSC101
Parameter definitions
Gain (Av) and input offset voltage (Vos)
The input offset voltage is defined as the intersection between the linear regression of Vout vs. Vsense curve with the X-axis (see Figure 2). If Vout1 is the output voltage with Vsense=Vsense1=50mV and Vout2 is the output voltage with Vsense=Vsense2=5mV, then Vos can be calculated with the following formula:
V sense1 - V sense2 V os = V sense1 - ----------------------------------------------- V out1 V out1 - V out2
The amplification gain Av is defined as the ratio between output voltage and input differential voltage:
V out Av = ----------------V sense
Figure 2.
Vout versus Vsense characteristics: detail for low Vsense values
Vout
V0
5mV
50mV
Vsense
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Parameter definitions
TSC101
Output voltage drift versus temperature
The output voltage drift versus temperature is defined as the maximum variation of Vout with respect to its value at 25C, over the temperature range.It is calculated as follows:
V out V out ( T amb ) - V out ( 25 C ) ---------------- = max ------------------------------------------------------------------------T T amb - 25 C
with Tmin < Tamb < Tmax. Figure 3 provides a graphical definition of output voltage drift versus temperature. On this chart, Vout is always comprised in the grey area defined by the maximum and minimum variation of Vout vs. T, and T=25C is considered to be the reference. Figure 3. Output voltage drift versus temperature
Output voltage drift vs. temperature 4.58
4.56
4.54
Vout (V)
4.52
4.5
4.48
4.46
4.44 -50 -25 0 25 50 Temperature (C) 75 100 125
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TSC101
Parameter definitions
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: Vout-th=Av . Vsense The actual value is very slightly different, mainly due to the effects of:

the input offset voltage Vos, non-linearity, VOL and VOH voltage saturation (see Figure 5 on page 12) Vout vs. Vsense theoretical and actual characteristics
Vout actual
Figure 4.
ideal
Vsense 5mV
The output voltage accuracy, expressed in percentage, can be calculated with the following formula: abs ( V out - ( Av V sense ) ) V out = -------------------------------------------------------------------------Av V sense with Av=20V/V for TSC101A, Av=50V/V for TSC101B and Av=100V/V for TSC101C.
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Parameter definitions
TSC101
Output voltage range
The output voltage versus input differential voltage is linear in a range of output voltage limited by high-level and low-level saturation voltage. Figure 5. Vout vs. Vsense over the full voltage range
Vout VCC
VOH
VOL Vsense
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TSC101
Application information
5
Application information
TSC101 can be used to measure current and to feed back the information to a micro controller, as shown in Figure 6 below.
Figure 6.
Typical application schematic
Vsense Iload load V Rg2
2.8V to 30V Rsense Vp Rg1
TSC101
5V VCC Vreg
VCC
ADC
Rg3
Out Vout Microcontroller GND
GND
The current from the supply flows to the load through the Rsense resistor causing a voltage drop equal to Vsense across Rsense. The amplifier input currents are negligible, therefore its inverting input voltage is equal to Vm. The amplifier's open-loop gain forces its non-inverting input to the same voltage as the inverting input. As a consequence, the amplifier will adjust current flowing through Rg1 so that the voltage drop across Rg1 will exactly match Vsense. Therefore, the drop across Rg1 is: VRg1=Vsense=Rsense.Iload If IRg1 is the current flowing through Rg1, then IRg1 is given by the formula: IRg1=Vsense/Rg1 The IRg1 current flows entirely into resistor Rg3 (the input bias current of the buffer is negligible). Therefore, the voltage drop on the Rg3 resistor can be calculated as follows: VRg3=Rg3.IRg1=(Rg3/Rg1).Vsense
13/18
Application information Because the voltage across the Rg3 resistor is buffered to the Out pin, Vout can be expressed as: Vout=(Rg3/Rg1).Vsense or Vout=(Rg3/Rg1).Rsense.Iload
TSC101
The resistor ratio Rg3/Rg1 is internally set to 20V/V for TSC101A, to 50V/V for TSC101B and to 100V/V for TSC101C. Because they define the full scale output range of your application, the Rsense resistor and the Rg3/Rg1 resistor ratio (equal to Av) are important parameters, and therefore must be selected carefully.
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TSC101
Package information
6
Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. Figure 7. SOT23-5 package
Dimensions Ref. Min. A A1 A2 b C D E E1 e e1 L 0.35 0.90 0.00 0.90 0.35 0.09 2.80 2.60 1.50 0.95 1.9 0.55 13.7 Millimeters Typ. Max. 1.45 0.15 1.30 0.50 0.20 3.00 3.00 1.75 Min. 35.4 0.00 35.4 13.7 3.5 110.2 102.3 59.0 37.4 74.8 21.6 Mils Typ. Max. 57.1 5.9 51.2 19.7 7.8 118.1 118.1 68.8
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Ordering information
TSC101
7
Table 9.
Ordering information
Order codes Temperature range Package Packaging Marking
O104 -40C, +125C SOT23-5 Tape & reel O105 O106
(1) (1)
Part number
TSC101AILT TSC101BILT TSC101CILT TSC101AIYLT TSC101BIYLT
Gain
20 50 100 20 50 100
O101 -40C, +125C automotive grade SOT23-5 Tape & reel O102 O103
TSC101CIYLT(1)
1. Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 & Q 002 or equivalent.
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TSC101
Revision history
8
Revision history
Date 5-Mar-2007 Revision Rev 1 Changes First release, preliminary data.
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TSC101
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