LTC6101HV Linear Technology, LTC6101HV Datasheet - Page 13

• Manufacturer Part Number: LTC6101HV
• Description: High-Side Current Sense Amplifier
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
be taken to limit the maximum output current by proper
choice of sense resistor and, if input fault conditions exist,
external clamps.
Output Filtering
The output voltage, V
filtering straightforward. Any circuit may be used which
generates the required Z
response. For example, a capacitor in parallel with R
will give a low pass response. This will reduce unwanted
noise from the output, and may also be useful as a charge
reservoir to keep the output steady while driving a switch-
ing circuit such as a mux or ADC. This output capacitor in
parallel with an output resistor will create a pole in the
output response at:
Useful Equations
Input Common Mode Range
The inputs of the LTC6101 can function from 1.5V below
the positive supply to 0.5V above it. Not only does this
Input Voltage: V
Current Gain:
Transconductance:
Transimpedance:
f
Voltage Gain:
–
3
dB
=
2
• •
π
R
I
V
SENSE
I
U
OUT
V
SENSE
SENSE
OUT
OUT
1
OUT
I
SENSE
V
, is simply I
•
OUT
V
C
=
U
I
SENSE
=
OUT
OUT
=
OUT
R
I
SENSE
R
SENSE
R
R
=
OUT
to get the desired filter
IN
IN
R
=
SENSE
OUT
R
W
•
1
IN
R
SENSE
• Z
•
OUT
R
R
OUT
IN
. This makes
U
OUT
allow a wide V
ence to be separate from the positive supply (Figure 5).
Note that the difference between V
more than the common mode range listed in the Electrical
Characteristics table. If the maximum V
500mV, the LTC6101 may monitor its own supply current,
as well as that of the load (Figure 6).
R
R
SENSE
SENSE
V
BATTERY
LOAD
LOAD
Figure 5. V
Load Supply (V
V
+
LTC6101/LTC6101HV
Figure 6. LTC6101 Supply Current
Monitored with Load
SENSE
R
R
IN
IN
4
2
4
2
range, it also allows the input refer-
+
Powered Separately from
LTC6101
LTC6101
BATT
+
+
)
–
–
BATT
and V
SENSE
6101 F05
6101 F06
3
5
1
3
5
1
R
R
+
V
OUT
OUT
is less than
+
must be no
V
OUT
V
OUT
13
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