STMICROELECTRONICS TSC101AILT

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
■
Automotive current monitoring
■
Notebook computers
■
DC motor control
■
Photovoltaic systems
■
Battery chargers
■
Precision current sources
5 Vcc
Gnd 2
Vp 3
4 Vm
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
1
TSC101
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
Iload
2.8V to 30V
Rsense
3
load
4
Vp
Vm
Rg1
Rg2
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.
2/17
Pin descriptions
Symbol
Type
Function
Out
Analog output
The output voltage, proportional to the magnitude of the sense
voltage Vp-Vm.
Gnd
Power supply
Ground line.
VCC
Power supply
Positive power supply line.
Vp
Analog input
Connection for the external sense resistor. The measured current
enters the shunt on the Vp side.
Vm
Analog input
Connection for the external sense resistor. The measured current
exits the shunt on the Vm side.
TSC101
2
Absolute maximum ratings and operating conditions
Absolute maximum ratings and operating conditions
Table 2.
Absolute maximum ratings
Symbol
Vid
Vi
Parameter
Input pins differential voltage (Vp-Vm)
Input pin voltages (Vp and Vm)
(1)
(1)
Value
Unit
±60
V
-0.3 to 60
V
-0.3 to 25
V
VCC
DC supply voltage
Vout
DC output pin voltage(1)
-0.3 to VCC
V
Tstg
Storage temperature
-55 to 150
°C
Maximum junction temperature
150
°C
SOT23-5 thermal resistance junction to ambient
250
°C/W
HBM: human body model(2)
2.5
kV
150
V
Tj
Rthja
ESD
(3)
MM: machine model
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
Operating conditions
Parameter
Value
Unit
VCC
DC supply voltage from Tmin to Tmax
4.0 to 24
V
Toper
Operational temperature range (Tmin to Tmax)
-40 to 125
°C
Vicm
Common mode voltage range
2.8 to 30
V
3/17
Electrical characteristics
TSC101
3
Electrical characteristics
Table 4.
Supply(1)
Symbol
ICC
Parameter
Total supply current
Test conditions
Min.
Vsense=0V
Tmin < Tamb < Tmax
Typ.
Max.
Unit
165
300
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
Test conditions
Min.
Typ.
Max.
Unit
CMR
Common mode rejection
Variation of Vout versus Vicm
referred to input(2)
2.8V< Vicm < 30V
Tmin < Tamb < Tmax
90
105
dB
SVR
Supply voltage rejection
Variation of Vout versus VCC(3)
4.0V< VCC < 24V
Vsense=30mV
Tmin < Tamb < Tmax
90
105
dB
Vos
Input offset voltage(4)
Tamb= 25° C
Tmin < Tamb < Tmax
±0.2
±0.9
dVos/dT
Input offset drift vs. T
Tmin < Tamb < Tmax
-3
Ilk
Input leakage current
VCC= 0V
Tmin < Tamb < Tmax
Iib
Input bias current
Vsense= 0V
Tmin < Tamb < Tmax
5.5
±1.5
±2.3
mV
µV/°C
1
µA
8
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.
4/17
TSC101
Table 6.
Electrical characteristics
Output(1)
Symbol
Parameter
Test conditions
Av
Gain
TSC101A
TSC101B
TSC101C
ΔAv
Gain accuracy
Tamb=25°C
Tmin < Tamb < Tmax
Output voltage drift vs. T(2)
Tmin < Tamb < Tmax
ΔVout/ΔT
ΔVout/ΔIout Output stage load regulation
Min.
Typ.
Max.
20
50
100
V/V
±2.5
±4.5
0.4
-10mA < Iout <10mA
Iout sink or source current
3
Unit
%
mV/°C
4
mV/mA
ΔVout
Total output voltage accuracy(3)
Vsense=50mV Tamb=25° C
Tmin < Tamb < Tmax
±2.5
±4.5
%
ΔVout
Total output voltage accuracy
Vsense=100mV Tamb=25° C
Tmin < Tamb < Tmax
±3.5
±5
%
ΔVout
Total output voltage accuracy
Vsense=20mV Tamb=25° C
Tmin < Tamb < Tmax
±8
±11
%
ΔVout
Total output voltage accuracy
Vsense=10mV Tamb=25° C
Tmin < Tamb < Tmax
±15
±20
%
Isc-sink
Short-circuit sink current
Out connected to VCC,
Vsense=-1V
30
60
mA
Short-circuit source current
Out connected to Gnd
Vsense=1V
15
26
mA
Voh
Output stage high-state saturation
voltage
Voh=VCC-Vout
Vsense=1V
Iout=1mA
0.8
1
V
Vol
Output stage low-state saturation
voltage
Vsense=-1V
Iout=1mA
50
100
mV
Isc-source
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 Output voltage drift versus temperature on page 12 for the definition.
3. 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.
5/17
Electrical characteristics
Table 7.
Frequency response(1)
Symbol
ts
SR
BW
TSC101
Parameter
Test conditions
Output settling to 1% final value
Vsense=10mV to 100mV,
Cload=47pF
TSC101A
TSC101B
TSC101C
Slew rate
Vsense=10mV to 100mV
3dB bandwidth
Cload=47pF, Vsense=100mV
TSC101A
TSC101B
TSC101C
Min.
0.55
Typ.
Max.
Unit
3
6
10
µs
0.9
V/µs
500
670
450
kHz
1. Unless otherwise specified, the test conditions are Tamb=25°C, VCC=12V, Vsense=Vp-Vm=50mV, Vm=12V, no load on Out.
Table 8.
Symbol
Noise(1)
Parameter
Total output voltage noise
Test conditions
Min.
Typ.
50
Max.
Unit
nV/√ Hz
1. Unless otherwise specified, the test conditions are Tamb=25°C, VCC=12V, Vsense=Vp-Vm=50mV, Vm=12V, no load on Out.
Electrical characteristics curves
In all of the electrical characteristics curves that follow, the tested device is a TSC101C, and
the test conditions are Tamb=25°C, VCC=12V, Vsense=Vp-Vm=50mV, Vm=12V, no load on Out
unless otherwise specified.
6/17
TSC101
Electrical characteristics
Figure 2.
Supply current vs. supply voltage
(Vsense= 0V)
Figure 3.
Supply current vs. Vsense
500
260
450
240
T=- 40°C
220
400
T=25°C
T=25°C
350
300
I CC (µA)
200
I CC (µA)
T=- 40°C
180
250
200
160
150
T=125°C
140
T=125°C
100
120
50
100
0
5
Figure 4.
10
15
VCC (V)
20
25
30
-120
-80
Vp pin input bias current vs. Vsense Figure 5.
-40
T=25°C
35
T=- 40°C
Iib (µA)
I ib (µA)
9
8
6
T=25°C
25
20
5
T=125°C
4
15
3
10
2
5
1
T=125°C
0
0
0
40
80
120
Vsense (mV)
Figure 6.
120
7
30
-40
80
10
T=- 40°C
40
-80
40
Vm pin input bias current vs. Vsense
45
-120
0
0
Vsense (mV)
-120
-80
-40
0
Vsense (mV)
40
80
120
Minimum common mode operating
voltage vs. temperature
2.8
2.7
VCC=5V
2.6
Voltage (V)
2.5
2.4
2.3
VCC=12V
2.2
2.1
2
1.9
-50
-25
0
25
50
75
100
125
T (°C)
7/17
Electrical characteristics
Figure 7.
TSC101
Output stage low-state saturation
voltage versus output current
(Vsense= -1V)
Figure 8.
Output stage high-state saturation
voltage versus output current
(Vsense= +1V)
2000
400
300
output stage
sinking
current
250
T=125°C
350
200
output stage
sourcing
current
Voh (mV)
Vol (mV)
output stage
sourcing
current
T=25°C
output stage
sinking
current
1500
T=- 40°C
1000
150
500
100
50
T=125°C
T=- 40°C
-10
-5
Figure 9.
-10
0
-50
Iout (mA)
5
T=25°C
0
0
-5
0
10
5
10
I out (mA)
Output short-circuit source current Figure 10. Output short-circuit sink current
versus temperature (Out pin
versus temperature (Out pin
connected to ground)
connected to VCC)
70
34
68
32
64
28
62
Iout (µA)
Iout (µA)
66
30
26
60
58
56
24
54
22
52
20
-50
-25
50
0
25
50
75
100
125
T (°C)
10
0
Vout -Vout0 (mV)
-5
0
T=- 40°C
T=25°C
5
-10
-20
T=125°C
-30
output stage
sourcing
current
-40
-50
Iout (mA)
8/17
-25
0
25
50
T (°C)
Figure 11. Output stage load regulation
-10
-50
output stage
sinking
current
10
75
100
125
TSC101
Electrical characteristics
Figure 12. Input offset drift versus
temperature
Figure 13. Output voltage drift versus
temperature
300
80
200
60
0
-50
-25
0
25
50
75
100
125
-100
-200
Vout - Vout (25°C) (mV)
Vos - Vos (25°C) (µV)
100
40
20
0
-50
-25
0
25
50
75
100
125
-20
-300
-40
-400
-60
-500
T (°C)
T (°C)
Figure 14. Bode diagram (Vsense=100mV)
Figure 15. Power-supply rejection ratio versus
frequency
50
110
40
100
30
90
TSC101C
10
PSRR (dB)
Gain (dB)
20
TSC101B
0
TSC101A
80
70
-10
60
-20
-30
50
-40
40
1.E+01
-50
1.E+03
1.E+04
1.E+05
1.E+06
1.E+07
1.E+02
1.E+03
1.E+04
1.E+05
Frequency (Hz)
Frequency (Hz)
Figure 16. Total output voltage accuracy
versus Vsense
Vout accuracy
100%
T=25°C
10%
Tmin < T < Tmax
1%
0
10
20
30
40
50
60
70
80
90
100
Vsense (mV)
9/17
Electrical characteristics
TSC101
Figure 17. Output voltage versus Vsense
Figure 18. Output voltage versus Vsense (detail
for low Vsense values)
12
1.0
0.9
10
0.8
0.6
Vout (V)
Vout (V)
6
TSC101A
0.5
0.3
TSC101B
2
0.2
TSC101C
0
100
200
300
TSC101A
0.1
0
400
500
600
700
Vsense (mV)
-4
0.0
-2
0
2
4
6
8
10
Vsense (mV)
Figure 19. Step response
Timebase 5µs/div
Vsense 100mV/div
TSC101C
TSC101B
TSC101A
Vout 2V/div
10/17
TSC101B
0.4
4
-100
TSC101C
0.7
8
12
14
16
18
20
TSC101
4
Parameter definitions
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:
ΔV out
CMR = – 20 ⋅ log -----------------------------ΔV 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:
ΔV out
SVR = – 20 ⋅ log ----------------------------ΔV CC ⋅ Av
Gain (Av) and input offset voltage (Vos)
The input offset voltage is defined as the intersection between the linear regression of the
Vout versus Vsense curve with the X-axis (see Figure 20). 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
11/17
Parameter definitions
TSC101
Figure 20. Vout versus Vsense characteristics: detail for low Vsense values
Vout1
Vout2
Vsense
Vos
5mV
50mV
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 25°C, over the temperature range. It is calculated as follows:
ΔV out
V out ( T amb ) – V out ( 25° C )
----------------- = max -------------------------------------------------------------------------ΔT
T amb – 25° C
with Tmin < Tamb < Tmax.
Figure 21 provides a graphical definition of output voltage drift versus temperature. On this
chart, Vout is always comprised in the area defined by dotted lines representing the
maximum and minimum variation of Vout versus T.
Figure 21. Output voltage drift versus temperature
80
Vout - Vout (25°C) (mV)
60
40
20
0
-50
-25
0
25
50
-20
-40
-60
T (°C)
12/17
75
100
125
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
Figure 22. Vout vs. Vsense theoretical and actual characteristics
Vout
actual
ideal
Vout accuracy for Vsense= 10mV
Vsense
10mV
The output voltage accuracy, expressed in percentage, can be calculated with the following
formula:
abs ( V out – ( A v ⋅ V sense ) )
ΔV out = ------------------------------------------------------------------------A v ⋅ V sense
with Av=20V/V for TSC101A, Av=50V/V for TSC101B and Av=100V/V for TSC101C.
13/17
Application information
5
TSC101
Application information
The TSC101 can be used to measure current and to feed back the information to a
microcontroller, as shown in Figure 23.
Figure 23. Typical application schematic
Vsense
Iload
2.8V to 30V
Rsense
load
Vp
Vm
Rg1
Rg2
TSC101
5V
Vreg
VCC
VCC
ADC
Rg3
Out
Microcontroller
Vout
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 adjusts
current flowing through Rg1 so that the voltage drop across Rg1 exactly matches 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
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
The resistor ratio Rg3/Rg1 is internally set to 20V/V for TSC101A, to 50V/V for TSC101B and
to 100V/V for TSC101C.
The Rsense resistor and the Rg3/Rg1 resistor ratio (equal to Av) are important parameters
because they define the full scale output range of your application. Therefore, they must be
selected carefully.
14/17
TSC101
6
Package information
Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in
ECOPACK® 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 24. SOT23-5 package
Dimensions
Ref.
Millimeters
Min.
Typ.
Mils
Max.
Min.
Typ.
Max.
A
0.90
1.45
35.4
57.1
A1
0.00
0.15
0.00
5.9
A2
0.90
1.30
35.4
51.2
b
0.35
0.50
13.7
19.7
C
0.09
0.20
3.5
7.8
D
2.80
3.00
110.2
118.1
E
2.60
3.00
102.3
118.1
E1
1.50
1.75
59.0
68.8
e
0.95
37.4
e1
1.9
74.8
L
0.35
0.55
13.7
21.6
15/17
Ordering information
TSC101
7
Ordering information
Table 9.
Order codes
Part number
Temperature
range
Package
Packaging
TSC101AILT
TSC101BILT
-40°C, +125°C
SOT23-5
Tape & reel
TSC101CILT
(1)
TSC101AIYLT
TSC101BIYLT(1)
-40°C, +125°C
(1)
SOT23-5
(Automotive grade)
Tape & reel
TSC101CIYLT
Marking
Gain
O104
20
O105
50
O106
100
O101
20
O102
50
O103
100
1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC
Q001 & Q 002 or equivalent are on-going.
8
Revision history
Table 10.
Document revision history
Date
Revision
5-Mar-2007
Rev 1
First release, preliminary data.
Rev 2
Document status promoted from preliminary data to datasheet.
Added test results in electrical characteristics tables.
Added electrical characteristics curves.
22-Oct-2007
16/17
Changes
TSC101
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2007 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
17/17