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Connection Descriptions
5
Connection Descriptions
Terminal Silkscreen
Description
VIN
This terminal is the input voltage to the device. The device will operation over the input voltage
range of 2.95V to 5.5V. The absolute maximum voltage rating for this pin is 6V.
GND
This terminal is the ground connection to the device. There are two different GND connections on
the PCB. One should be used for the input supply and the other for the load.
VOUT
This terminal connects to the output voltage of the power supply and should be connected to the
load.
EN
This terminal connects to the enable pin of the device. This terminal should be connected to V
IN
or
driven externally. If driven externally, a voltage typically greater than 1.18V will enable the device.
The operating voltage for this pin should not exceed 5.5V. The absolute maximum voltage rating
on this pin is 6V.
SS/TRACK
This terminal provides access to the SS/TRK pin of the device. Connections to this terminal are
not needed for most applications. The feedback pin of the device will track the voltage on the
SS/TRK pin if it is driven with an external voltage source that is below the 0.8V reference. The
voltage on this pin should not exceed 5.5V during normal operation. The absolute maximum
voltage rating on this pin is 6V.
PGOOD
This terminal connects to the power good output of the device. There is a 10 k
Ω
pull-up resistor
from this pin to the input voltage. The voltage on this pin should not exceed 5.5V during normal
operation and has an absolute maximum voltage rating of 6V.
5
SNVA252B – October 2007 – Revised May 2013
AN-1654 LM20124 Evaluation Board
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