LP3872, LP3875

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SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013

Figure 19. Error Flag Operation

SENSE PIN

In applications where the regulator output is not very close to the load, LP3875 can provide better remote load

regulation using the SENSE pin. Figure 20 depicts the advantage of the SENSE option. LP3872 regulates the

voltage at the output pin. Hence, the voltage at the remote load will be the regulator output voltage minus the

drop across the trace resistance. For example, in the case of a 3.3V output, if the trace resistance is 100m

Ω, the

sense pin. Connecting the sense pin to the remote load will provide regulation at the remote load, as shown in

Figure 20. Improving Remote Load Regulation Using LP3875

SHUTDOWN OPERATION

A CMOS Logic level signal at the shutdown ( SD) pin will turn-off the regulator. Pin SD must be actively

terminated through a 10k

Ω pull-up resistor for a proper operation. If this pin is driven from a source that actively

pulls high and low (such as a CMOS rail to rail comparator), the pull-up resistor is not required. This pin must be

tied to Vin if not used.

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Product Folder Links: LP3872 LP3875