LP3965EMP-3.3 National Semiconductor, LP3965EMP-3.3 Datasheet - Page 12

• Manufacturer Part Number: LP3965EMP-3.3
• Description: Linear Voltage Regulator IC
• Manufacturer: National Semiconductor

Specifications of LP3965EMP-3.3

• Dropout Voltage Vdo: 380mV
• No. Of Pins: 5
• Output Current: 1.5A
• Peak Reflow Compatible (260 C): No
• Current Rating: 1.5A
• Output Voltage Max: 3.3V
• Leaded Process Compatible: No
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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Applications Information
Sense Pin
In applications where the regulator output is not very close to
the load, LP3965 can provide better remote load regulation
using the SENSE pin. Figure 2 depicts the advantage of the
SENSE option. LP3962 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-
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 pull-up resistor for a proper operation. If this
FIGURE 2. Improving remote load regulation using LP3965
(Continued)
FIGURE 1. Error Flag Operation
12
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.
tance. For example, in the case of a 3.3V output, if the trace
resistance is 100m , the voltage at the remote load will be
3.15V with 1.5 A of load current, I
lates 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
DS101266-7
LOAD
. The LP3965 regu-
DS101266-8
OUT
pin.