LP3963 Datasheet, PDF (11/14 Pages) National Semiconductor (TI) – 3A Fast Ultra Low Dropout Linear Regulators

Applications Information (Continued)
FIGURE 1. Error Flag Operation
DS101267-7
Sense Pin
In applications where the regulator output is not very close to
the load, LP3966 can provide better remote load regulation
using the SENSE pin. Figure 2 depicts the advantage of the
SENSE option. LP3963 regulates the voltage at the output
pin. Hence, the voltage at the remote load will be the regula-
tor 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 100mΩ, the voltage at the remote load will be
3V with 3A of load current, I_LOAD. The LP3966 regulates the
voltage at the sense pin. Connecting the sense pin to the re-
mote 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.
FIGURE 2. Improving remote load regulation using LP3966
DS101267-8
11
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