LP3873ES-3.3 datasheet(13/16 Pages) NSC

Teilenummer	LP3873ES-3.3

Bauteilbeschribung	3A Fast Ultra Low Dropout Linear Regulators

PDF	16 Pages

Scroll/Zoom	100%

Hersteller	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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13 / 16 page

Application Hints (Continued)

SENSE PIN

In applications where the regulator output is not very close to

the load, LP3876 can provide better remote load regulation

using the SENSE pin. Figure 2 depicts the advantage of the

SENSE option. LP3873 regulates the voltage at the output

pin. Hence, the voltage at the remote load will be the regu-

lator output voltage minus the drop across the trace resis-

tance. For example, in the case of a 3.3V output, if the trace

resistance is 100m

Ω, the voltage at the remote load will be

3V with 3A of load current, I

LOAD. The LP3876 regulates the

voltage at the sense pin. Connecting the sense pin to the

remote load will provide regulation at the remote load, as

shown in Figure 2. If the sense option pin is not required, the

sense pin must be connected to the V

OUT pin.

20060507

FIGURE 1. Error Flag Operation

20060508

FIGURE 2. Improving remote load regulation using LP3876

LP3873ES-3.3 Datenblatt(PDF) 13 Page - National Semiconductor (TI)