LP3872ET-1.8/NOPB National Semiconductor, LP3872ET-1.8/NOPB Datasheet - Page 13

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LP3872ET-1.8/NOPB

Manufacturer Part Number
LP3872ET-1.8/NOPB
Description
IC REG LDO 1.5A 1.8V TO-220-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LP3872ET-1.8/NOPB

Regulator Topology
Positive Fixed
Voltage - Output
1.8V
Voltage - Input
2.5 ~ 7 V
Number Of Regulators
1
Current - Output
1.5A (Max)
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-5 (Bent and Staggered Leads)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Dropout (typical)
-
Current - Limit (min)
-
Other names
*LP3872ET-1.8
*LP3872ET-1.8/NOPB
LP3872ET-1.8
Application Hints
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 2 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 regu-
lator 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 10kΩ pull-up resistor for a proper operation. If this
(Continued)
FIGURE 2. Improving remote load regulation using LP3875
FIGURE 1. Error Flag Operation
13
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
3.15V with 1.5A of load current, I
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
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.
20063307
LOAD
. The LP3875 regulates
20063308
OUT
pin.
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