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Powering and Loading Considerations

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

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

AC INJ This terminal block allows the user 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.

SYNC This terminal connects to the SYNC pin of the device. The LM21212-1 can synchronize the SWITCH pin

to a SYNC signal with a frequency between 300kHz and 1.5MHz. If this pin is left open, the switching

frequency will default to 1MHz.

VIN_SENSE+, These terminals allow a sense connection on the board for accurate V

and V

OUT

measurements,

VIN_SENSE- respectively.

VOUT_SENSE+,

VOUT_SENSE-

SNVA467B–February 2011–Revised May 2013 AN-2107 LM21212-1 Evaluation Board

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