LTC6101CIS5TRMPBF View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC6101CIS5TRMPBF Datasheet PDF : 22 Pages
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LTC6101/LTC6101HV
APPLICATIONS INFORMATION
Output Filtering
The output voltage, VOUT, is simply IOUT • ZOUT. This
makes filtering straightforward. Any circuit may be used
which generates the required ZOUT to get the desired filter
response. For example, a capacitor in parallel with ROUT
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:
f–3dB
=
2
•
π
1
• ROUT
• COUT
Useful Equations
Input Voltage: VSENSE = ISENSE • RSENSE
Voltage Gain: VOUT = ROUT
VSENSE RIN
Current Gain: IOUT = RSENSE
ISENSE RIN
Transconductance: IOUT = 1
VSENSE RIN
Transimpedance:
VOUT
ISENSE
= RSENSE
•
ROUT
RIN
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 VSENSE range, it also allows the input refer-
ence to be separate from the positive supply (Figure 5).
Note that the difference between VBATT and V+ must be no
more than the common mode range listed in the Electrical
Characteristics table. If the maximum VSENSE is less than
500mV, the LTC6101 may monitor its own supply current,
as well as that of the load (Figure 6).
VBATTERY
RSENSE
RIN
+IN
LOAD
V–
+–
–IN
V+
V+
LTC6101
OUT
VOUT
ROUT
6101 F05
Figure 5. V+ Powered Separately from
Load Supply (VBATT)
V+
RIN
RSENSE
+IN
–IN
+–
LOAD
V–
V+
14
LTC6101
OUT
VOUT
ROUT
Figure 6. LTC6101 Supply Current
Monitored with Load
6101 F06
6101fh
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