Fairchild FAN4010 High-side current sensor Datasheet

FAN4010
High-Side Current Sensor
Features at +5V
Description
■ Low cost, accurate, high-side current sensing
The FAN4010 is a high-side current sense amplifier
designed for battery-powered systems. Using the
FAN4010 for high-side power-line monitoring does not
interfere with the battery charger’s ground path. The
FAN4010 is designed for portable PC’s, cellular phones,
and other portable systems where battery/DC power-line
monitoring is critical.
■ Output voltage scaling
■ Up to 2.5V sense voltage
■ 2V to 6V supply range
■ 2μA typical offset current
■ 3.5μA quiescent current
■ -0.2% accuracy
To provide a high level of flexibility, the FAN4010 functions
with an external sense resistor to set the range of load
current to be monitored. It has a current output that can
be converted to a ground-referred voltage with a single
resistor, accommodating a wide range of battery voltages
and currents. The FAN4010 features allow it to be used
for gas gauging as well as uni-directional or bi-directional
current monitoring.
■ SOT23-5 package
■ 6-lead MicroPak™ future package option
Applications
■ Battery chargers
■ Smart battery packs
■ DC motor control
■ Over-current monitor
■ Power management
■ Programmable current source
Functional Block Diagram and Typical Circuit
Load
VIN
RLoad
1007
1
NC
2
GND
3
IOUT
Load
5
RSENSE
VIN
4
VIN
VOUT
ROUT
IOUT
Figure 1. Functional Block Diagram and Typical Circuit
Ordering Information
Part Number
FAN4010IS5X
FAN4010IL6X*
Package
Pb-Free
Operating
Temperature Range
Packaging
Method
SOT23-5
MicroPak-6
Yes
Yes
-40°C to +85°C
-40°C to +85°C
Reel
Reel
Moisture sensitivity level for all parts is MSL-1.
MicroPak™ is a trademark of Fairchild Semiconductor Corporation.
*Future package option.
© 2007 Fairchild Semiconductor Corporation
FAN4010 Rev. 1.0.1
www.fairchildsemi.com
FAN4010 High-Side Current Sensor
March 2007
MicroPak
SOT23-5
NC
1
GND
2
IOUT
3
5
4
Load
VIN
GND
1
6
Load
NC
2
5
VIN
NC
3
4
IOUT
top view
Figure 2. SOT23-5 Pin Configuration
Figure 3. MicroPak™-5 Pin Configuration
Pin Assignments
SOT Pin #
MicroPak™ Pin #
Name
1
2, 3
NC
2
1
GND
Ground
3
4
IOUT
Output current, proportional to VIN - VLoad
4
5
VIN
Input voltage (supply voltage)
5
6
Load
Connection to load or battery
© 2007 Fairchild Semiconductor Corporation
FAN4010 Rev. 1.0.1
Description
No Connect; leave pin floating
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2
FAN4010 High-Side Current Sensor
Pin Configurations
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable
above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition,
extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute
maximum ratings are stress ratings only.
Symbol
Min.
Max.
Unit
Vs
Supply Voltage
Parameter
0
6.3
V
VIN
Input Voltage Range
0
6.3
V
Reliability Information
Symbol
TJ
TSTG
TL
θJA
Parameter
Min.
Typ.
Max.
Unit
150
°C
150
°C
260
°C
Junction Temperature
Storage Temperature Range
-65
Reflow Temperature (Soldering)
Package Thermal Resistance
MicroPak™-5
271
°C/W
SOC23-5
191
°C/W
Note:
1. Package thermal resistance (θJA), JEDEC standard, multi-layer test boards, still air.
ESD Protection
Symbol
Electrostatic Discharge Standard
Value
HBM
Human Body Model
5kV
CDM
Charged Device Model
1kV
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings.
Symbol
Parameter
Min.
Typ.
Max.
Unit
TA
Operating Temperature Range
-40
+85
°C
Vs
Supply Voltage Range
2
6
V
VIN
Input Voltage Range
2
6
V
Sensor Voltage Range, VSENSE = VIN - VLoad; ROUT = 0Ω
0
2.5
V
VSENSE
© 2007 Fairchild Semiconductor Corporation
FAN4010 Rev. 1.0.1
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3
FAN4010 High-Side Current Sensor
Absolute Maximum Ratings
TA = 25°C, Vs = VIN = 5V, ROUT = 100Ω, RSENSE = 100Ω, unless otherwise noted.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
Frequency Domain Response
BWss
Small Signal Bandwidth
PIN = -40dBm(2),
VSENSE = 10mV
600
kHz
BWLs
Large Signal Bandwidth
PIN = -20dBm(3),
VSENSE = 100mV
2
MHz
Input Voltage Range
VIN = Vs
2
VSENSE = 0V
0
VIN
IOUT
Is
ISENSE
Output Current
(1,4)
Supply Current
(1)
1
6
V
4
μA
VSENSE = 10mV
93
100
107
μA
VSENSE = 100mV
0.975
1.000
1.025
mA
VSENSE = 200mV
1.95
2.00
2.05
mA
VSENSE = 1V
9.7
10.0
10.3
mA
3.5
5.0
μA
VSENSE = 0V, GND pin current
2
Load Pin Input Current
ACY
Accuracy
RSENSE = 100Ω,
RSENSE = 200mV(1)
Gm
Transconductance
IOUT /VSENSE
-2.5
-0.2
10000
nA
2.5
%
μA/V
Notes:
1. 100% tested at 25˚C.
2. -40dBm = 6.3mVpp into 50Ω.
3. -20dBm = 63mVpp into 50Ω.
4. Includes input offset voltage contribution.
© 2007 Fairchild Semiconductor Corporation
FAN4010 Rev. 1.0.1
www.fairchildsemi.com
4
FAN4010 High-Side Current Sensor
Electrical Characteristics at +5V
TA = 25°C, Vs = VIN = 5V, ROUT = 100Ω, RSENSE = 100Ω, unless otherwise noted.
10
250
Output Current Error (%)
VS = 5V
IOUT (mA)
ROUT = 0Ω
ROUT = 100Ω
1
VIN = 5V
ROUT = 0Ω
Average of 100 parts
200
150
100
+1 SIGMA
50
Average
0
-50
-1 SIGMA
-100
-150
0.1
0.1
0.01
1
0.1m
1m
10m
VSENSE (V)
Figure 4. VSENSE vs. Output Current
10.4
Normalized Gain (dB)
IOUT (mA)
3
10.0
9.8
9.6
9.4
Vs = 5V
ROUT = 100Ω
-20
0
20
40
60
VSENSE = 1V
VSENSE = 0.1V
-3
VSENSE = 0.01V
-6
-9
PIN = -20dBm of VSENSE = 0.1V & 1V
PIN = -40dBm of VSENSE = 0.01V
80
0.01
0.1
Temperature (°C)
1
10
Frequency (MHz)
Figure 6. Output Current vs. Temperature
Figure7. Frequency Response
12
12
ROUT = 0Ω
ROUT = 100Ω
VSENSE = 1V
10
IOUT (mA)
VSENSE = 0.4V
4
VSENSE = 0.2V
2
VSENSE = 0.8V
8
VSENSE = 0.6V
6
VSENSE = 1V
10
VSENSE = 0.8V
8
IOUT (mA)
10
0
-12
-40
1
Figure 5. Output Current Error vs. VSENSE
VSENSE = 1V
VIN = 5V
RL= 0Ω
10.2
100m
VSENSE (V)
VSENSE = 0.6V
6
VSENSE = 0.4V
4
VSENSE = 0.2V
2
0
0
-2
-2
0
1
2
3
4
0
5
VIN (V)
2
3
4
5
VIN (V)
Figure 8. Transfer Characteristics
© 2007 Fairchild Semiconductor Corporation
FAN4010 Rev. 1.0.1
1
Figure 9. Transfer Characteristics
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5
FAN4010 High-Side Current Sensor
Typical Performance Characteristics
TA = 25°C, Vs = VIN = 5V, ROUT = 100Ω, RSENSE = 100Ω, unless otherwise noted.
0
2.5
CMRR (dB)
-20
Output Current Error (%)
VIN = 5V
PIN = -20dBm
ROUT = 100Ω
-10
-30
-40
VSENSE = 100mV
-50
-60
VSENSE = 10mV
-70
VSENSE = 1mV
-80
-90
0.00001 0.0001
VSENSE = 200mV
ROUT = 0Ω
Average of 100 parts
2.0
1.5
+1 SIGMA
1.0
Average
0.5
0
-0.5
-1 SIGMA
-1.0
-1.5
-2.0
-2.5
0.001
0.01
0.1
1
10
2.0
Frequency (MHz)
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VIN (V)
Figure 10. CMRR vs. Frequency
Figure 11. VIN vs. Output Current Error
6.0
VIN = 5V
ROUT = 100Ω
5.5
5.0
Is (μA)
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
VSENSE (V)
Figure 12. Supply Current vs. VSENSE
© 2007 Fairchild Semiconductor Corporation
FAN4010 Rev. 1.0.1
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6
FAN4010 High-Side Current Sensor
Typical Performance Characteristics (Continued)
Detailed Description
The FAN4010 measures the voltage drop (V SENSE)
across an external sense resistor located in the high
voltage side of the circuit. V SENSE is converted to a
linear current via an internal operational amplifier and
precision 100Ω resistor. The value of this current is
V SENSE/100Ω (internal). Output current flows from the
IOUT pin to an external resistor R OUT to generate an
output voltage proportional to the current flowing to
the load.
INPUT
0.3in Copper
Use the following equations to scale a load current to
an output voltage:
VSENSE = ILoad * R SENSE
EQ.1
V OUT = 0.01 x VSENSE x ROUT
EQ.2
NC
2
GND
3
IOUT
Load
4
ROUT
Figure 13. Functional Circuit
Selecting RSENSE
Selection of RSENSE is a balance between desired accuracy and allowable voltage loss. Although the FAN4010
is optimized for high accuracy with low VSENSE values, a
larger RSENSE value provides additional accuracy. However, larger values of RSENSE create a larger voltage
drop, reducing the effective voltage available to the load.
This can be troublesome in low-voltage applications.
Because of this, the maximum expected load current
and allowable load voltage should be well understood.
Although higher values of VSENSE can be used, RSENSE
should be chosen to satisfy the following condition:
3
IOUT
VIN
4
The input voltage and full-scale output current (IOUT_
needs to be taken into account when setting up the
output range. To ensure sufficient operating headroom, choose:
FS)
(R OUT * IOUT_FS) such that
VIN - VSENSE - (ROUT * IOUT_FS) > 1.2V
EQ. 4
Output current accuracy for the recommended V SENSE
levels between 10mV and 200mV are typically much
better than 1%. As a result, the absolute output voltage accuracy is dependent upon the precision of the
output resistor.
EQ. 3
For low-cost applications where accuracy is not as
important, a portion of the printed circuit board (PCB)
trace can be used as an R SENSE resistor. Figure 14
shows an example of this configuration. The resistivity
of a 0.1 inch wide trace of two-ounce copper is about
30mΩ/ft. Unfortunately, the resistance temperature
coefficient is relatively large (approximately 0.4% / C),
so systems with a wide temperature range may need
© 2007 Fairchild Semiconductor Corporation
FAN4010 Rev. 1.0.1
GND
5
R OUT can be chosen to obtain the output voltage range required for the particular downstream application.
For example, if the output of the FAN4010 is intended
to drive an analog-to-digital convertor (ADC), R OUT
should be chosen such that the expected full-scale
output current produces an input voltage that matches
the input range of the ADC. For instance, if expected
loading current ranges from 0 to 1A, a R SENSE resistor
of 1Ω produces an output current that ranges from 0 to
10mA. If the input voltage range of the ADC is 0 to 2V,
a R OUT value of 200Ω should be used.
VIN
VOUT
10mV < VSENSE < 200mV
2
Load
Selecting ROUT
VSENSE
+
VIN
NC
Figure 14. Using PCB Trace for RSENSE
–
1007
1
0.3in Copper
ROUT
5
RSENSE
0.1in Copper
VOUT
RLoad
1
LOAD
RSENSE
Make sure the input impedance of the circuit connected to VOUT is much higher than ROUT to ensure
accurate V OUT values.
Since the FAN4010 provides a trans-impedance function, it is ideal for applications involving current rather
than voltage sensing.
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7
FAN4010 High-Side Current Sensor
to compensate for this effect. Additionally, self heating
due to load currents introduces a nonlinearity error.
Care must be taken not to exceed the maximum power
dissipation of the copper trace.
Application Information
FAN4010 High-Side Current Sensor
Mechanical Dimensions
Dimensions are in millimeters unless otherwise noted.
Figure 15. 5-Lead SOT23 Package
© 2007 Fairchild Semiconductor Corporation
FAN4010 Rev. 1.0.1
www.fairchildsemi.com
8
Dimensions are in millimeters unless otherwise noted.
2X
0.05 C
1.45
B
2X
(1)
0.05 C
(0.49)
5X
1.00
(0.75)
(0.52)
1X
A
TOP VIEW
0.55MAX
(0.30)
6X
PIN 1
0.05 C
0.05
0.00
RECOMMENED
LAND PATTERN
0.05 C
C
DETAIL A
0.25
0.15 6X
1.0
0.10
0.05
0.45
0.35
0.10
0.00 6X
C B A
C
0.40
0.30
0.35 5X
0.25
0.40 5X
0.30
(0.05)
6X
Notes:
0.5
BOTTOM VIEW
(0.13)
4X
0.075 X 45
CHAMFER
DETAIL A
PIN 1 TERMINAL
1. CONFORMS TO JEDEC STANDARD M0-252 VARIATION UAAD
2. DIMENSIONS ARE IN MILLIMETERS
3. DRAWING CONFORMS TO ASME Y14.5M-1994
MAC06AREVC
Figure 16. 6-Lead MicroPak™ Package
© 2007 Fairchild Semiconductor Corporation
FAN4010 Rev. 1.0.1
www.fairchildsemi.com
9
FAN4010 High-Side Current Sensor
Mechanical Dimensions
FAN4010 High-Side Current Sensor
www.fairchildsemi.com
©2007 Fairchild Semiconductor Corporation