MCP16311/2 Synchronous Buck Converter Evaluation Board User’s Guide
DS50002111A-page 14 2013 Microchip Technology Inc.
2.2 BOARD FEATURES
The MCP16311/2 Synchronous Buck Converter Evaluation Board has the following
features:
• Input Voltage Range (V
IN
): 4V to 30V
• Fixed Output Voltage: 3.3V and 5.0V
• Output Current: typically 1A @ 3.3V Output, 12V Input
• Automatic PFM/PWM Operation for MCP16311, or PWM-only for MCP16312
• PWM Switching Frequency: 500 kHz
• Internal Compensation
• Internal Soft Start
• Overtemperature protection (if the die temperature exceeds +150°C, 25°C
hysteresis)
2.3 GETTING STARTED
The MCP16311/2 Synchronous Buck Converter Evaluation Board is fully assembled
and tested to evaluate and demonstrate the MCP16311/2 products. This board
requires the use of external lab supplies and load.
2.3.1 Power Input and Output Connection
2.3.1.1 POWERING THE MCP16311/2 SYNCHRONOUS BUCK CONVERTER
EVALUATION BOARD
The evaluation board has two independent circuit applications. One uses the
MCP16311 in the 8LD MSOP package, the other uses the MCP16312 device in the
8LD TDFN package. The 8LD MSOP package has an output voltage setting of 3.3V.
The 8LD TDFN package has an output voltage setting of 5.0V.
The switch peak current limit will provide a safe maximum current value. The maximum
output current for the converters will vary with input and output voltages. Refer to the
MCP16311/2 data sheet for more information on the maximum output current.
2.3.1.2 BOARD POWER-UP PROCEDURE
1. Connect power supply at input. Input voltage should be higher than V
OUT
.
Connect system load to V
OUT
and GND terminals; maximum load varies with
input and output voltage (see the MCP16311/2 data sheet for more information
on the maximum load). Connect the (+) side of the load to V
OUT
and the (–) load
to GND terminals.
2. By default, the EN pin is pulled high through a resistor, so the converter is
enabled and V
OUT
can be measured between V
OUT
and GND terminals. When
EN is pulled low, the converter is disabled and V
OUT
is floating and disconnected
from the input.
3. The measured output voltage should be 3.3V/5V. Adjusting the input voltage and
load should not cause the output to vary more than a few mV over the operating
range of the converter.
