LTC1921 datasheet(14/22 Pages) LINER

14 / 22 page

LTC6101/LTC6101HV

6101fh

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:

–3dB =

2•

π •R

OUT •COUT

Useful Equations

Input Voltage: VSENSE =ISENSE •RSENSE

Voltage Gain:

VOUT

VSENSE

ROUT

RIN

Current Gain:

IOUT

ISENSE

RSENSE

RIN

Transconductance:

IOUT

VSENSE

RIN

Transimpedance:

VOUT

ISENSE

= R

SENSE •

ROUT

RIN

Figure 5. V+ Powered Separately from

Load Supply (VBATT)

Figure 6. LTC6101 Supply Current

Monitored with Load

LTC6101

ROUT

VOUT

6101 F05

RIN

LOAD

V+

RSENSE

VBATTERY

V+

V–

OUT

–IN

+IN

LTC6101

ROUT

VOUT

6101 F06

RIN

LOAD

V+

RSENSE

V+

V–

OUT

–IN

+IN

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).

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