MCP16321 Evaluation Board User’s Guide
DS52024A-page 12 2011 Microchip Technology Inc.
A copper via, labeled PGD, connected to the power good pin on the device, can be pop-
ulated to monitor the power good output of the device. The power good pin is externally
pulled up to V
OUT
with a 10 kΩ resistor (R2).The power good output pin should not be
pulled to a voltage higher than 6.0V.
A copper via, labeled INJ, connected between the 10Ω injection resistor (R1) and the
R
TOP
resistor can be populated to allow a convenient injection point for stability
analysis.
A copper via, labeled EN, connected to the enable input on the device can be populated
and used to turn the MCP16321 on and off. Turning the device ON (Enable > 2.2V)
when the under-voltage lockout threshold is met (V
IN
> 5.75V), will enable the device.
This pin must be pulled low (Enable < 0.8V) to disable the device. The EN input is inter-
nally pulled high enabling the device. It is not necessary to pull the EN input high for
the device to operate and regulate output voltage. The Enable input pin should not be
driven to a voltage higher than 6.0V.
A copper via, labeled SW, connected to the switch node of the device can be populated
to analyze the switch node of the device.
2.2 GETTING STARTED
The MCP16321 Evaluation Board is fully assembled and tested to evaluate and dem-
onstrate the MCP16321 operational capabilities.
2.2.1 Power Input and Output Connection
2.2.1.1 POWERING THE MCP16321 EVALUATION BOARD
The MCP16321 Evaluation Board is fully assembled, tested and ready to begin evalu-
ation. Apply positive input voltage to the V
IN
terminal and its return to the GND terminal.
The maximum input voltage should not exceed 24V. An electronic load or resistive load
can be used for evaluation, or the intended system load can be connected. Electronic
loads attempt to sink current at 0V during startup; a resistive load or constant resis-
tance is recommended for startup evaluation. Connect the positive voltage terminal of
the load to the V
OUT
terminal on the demo board and connect the negative or return
side of the load to the GND terminal.
2.2.1.2 BOARD TESTING
To test the board:
1. Apply greater than 6V to the input for proper operation; no minimum load is
required to regulate the output to 3.0V.
2. The EN input is internally pulled up to a low voltage internal source enabling the
device. To disable the device, the EN input can be pulled below 0.8V.
3. The measured output voltage should be 3.0.V typical. Adjusting the input voltage
and load should not cause the output to vary significantly over the operating
range of the converter.
