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4 Connection Descriptions
Table 1. Connection Descriptions
Terminal Silkscreen Description
VIN This terminal is the input voltage to the device. The evaluation board will operate over the input voltage
range of 2.95V to 5.5V.
GND These terminals are the ground connections to the device. The input power ground should be connected
next to the input V
IN
connection, and the output power ground next to the V
OUT
connection.
VOUT This terminal connects to the output voltage of the power supply and should be connected to the load.
ENABLE This terminal connects to the enable pin of the device. This terminal can be left floating or driven
externally. If left floating, a 2µA current source will pull the pin high, thereby enabling the device. If driven
externally, a voltage typically less than 1.2V will disable the device.
SS/TRK 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 0.6V reference.
PGOOD This terminal connects to the power good output of the device. This pin is pulled up through a 10 kΩ
pull-up resistor to V
IN
.
AC INJ This terminal block allows you to insert an AC injection signal across a 49.9Ω resistor for open-loop gain
bode measurements. A jumper shorts out this resistor when it is not needed.
SWITCH This terminal allows easy probing of the switch node. Do not apply any external voltage source to this
pin.
VIN_SENSE+, These terminals allow a sense connection on the board for accurate V
IN
and V
OUT
measurements,
VIN_SENSE- respectively.
VOUT_SENSE+,
VOUT_SENSE-
3
SNVA480A–May 2011–Revised May 2013 AN-2140 LM21212-2 Evaluation Board
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