LTC6101HV Linear Technology, LTC6101HV Datasheet - Page 13

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

APPLICATIONS INFORMATION
Output Filtering
The output voltage, V
makes fi ltering 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 Voltage: V
Current Gain:
f
Voltage Gain:
Transconductance:
Transimpedance:
– 3dB
=
2 • π • R
I
V
SENSE
I
OUT
SENSE
V
OUT
SENSE
1
OUT
I
SENSE
V
OUT
• C
V
OUT
=
I
SENSE
=I
OUT
OUT
=
, is simply I
R
SENSE
R
SENSE
R
R
=R
OUT
OUT
IN
IN
=
SENSE
R
• R
to get the desired fi lter
1
IN
SENSE
•
OUT
R
R
OUT
IN
• Z
OUT
. This
OUT
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
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
V
+
Figure 5. V
Load Supply (V
Figure 6. LTC6101 Supply Current
Monitored with Load
R
R
SENSE
IN
IN
LTC6101/LTC6101HV
+IN
+IN
V
V
–
–
range, it also allows the input refer-
LTC6101
LTC6101
+
Powered Separately from
+
+
BATT
)
–
–
BATT
–IN
–IN
V
OUT
V
OUT
and V
+
+
SENSE
6101 F05
V
+
+
R
OUT
is less than
must be no
R
OUT
V
OUT
6101 F06
13
V
OUT
6101fg