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LTC6101/LTC6101HV

6101fh

BLOCK DIAGRAM

OUT: Current Output. OUT will source a current that is

proportional to the sense voltage into an external resistor.

V–:

Negative Supply (or Ground for Single-Supply

Operation).

–IN: The internal sense ampliﬁer will drive IN– to the same

potential as IN+. A resistor (RIN) tied from V+ to IN– sets

the output current IOUT = VSENSE/RIN. VSENSE is the voltage

developed across the external RSENSE (Figure 1).

+IN: Must be tied to the system load end of the sense

resistor, either directly or through a resistor.

V+:

Positive Supply Pin. Supply current is drawn through

this pin. The circuit may be conﬁgured so that the

LTC6101 supply current is or is not monitored along

with the system load current. To monitor only system

load current, connect V+ to the more positive side of the

sense resistor. To monitor the total current, including the

LTC6101 current, connect V+ to the more negative side

of the sense resistor.

The LTC6101 high side current sense ampliﬁer (Figure 1)

provides accurate monitoring of current through a user-

selected sense resistor. The sense voltage is ampliﬁed by

a user-selected gain and level shifted from the positive

power supply to a ground-referred output. The output

signal is analog and may be used as is or processed with

an output ﬁlter.

Theory of Operation

An internal sense ampliﬁer loop forces IN– to have the

same potential as IN+. Connecting an external resis-

tor, RIN, between IN– and V+ forces a potential across

RIN that is the same as the sense voltage across

RSENSE. A corresponding current, VSENSE/RIN, will

ﬂow through RIN. The high impedance inputs of the

sense ampliﬁer will not conduct this input current,

so it will ﬂow through an internal MOSFET to the output pin.

The output current can be transformed into a voltage by

adding a resistor from OUT to V–. The output voltage is

then VO = V– + IOUT • ROUT.

V+

V–

10V

OUT

6101 BD

LTC6101/LTC6101HV

VBATTERY

IOUT

VSENSE

RSENSE

ILOAD

ROUT

RIN

–

VOUT = VSENSE x

ROUT

RIN

10V

–IN

+IN

Figure 1. LTC6101/LTC6101HV Block Diagram and Typical Connection

APPLICATIONS INFORMATION

PIN FUNCTIONS

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