MP4560-DCDC Module

This project introduces
the MP4560-DCDC module design, which uses a 6-pin Type-C interface and a 2.543-pin header for input, and screw terminals and a 2.543-pin header for output. The power module has a maximum input voltage of 55V, a fixed output of 3.3V, and a maximum output current of 2A.
Chip characteristics include:

wide input voltage range of 3.8V to 55V;
250mR internal power MOSFET;
programmable switching frequency up to 2MHz;
140uA quiescent current;
internal soft-start
; and adjustable output from 0.8V to 52V.

The circuit

uses a 4.7uf + 100nf capacitor for input filtering; note the capacitor's voltage rating.
The EN pin is floating and enabled by default. If using a voltage divider resistor for enabling, ensure the EN pin's voltage rating does not exceed 5V.
The switching frequency can be programmed via the FREQ pin resistor.
Loop compensation is implemented via the COMP pin for better conversion efficiency.
The output voltage is obtained via the FB feedback pin resistor. To modify the output voltage, change the feedback resistor ratio.

Important notes:

When the entire power supply system operates at 5V or lower, it is recommended to add a diode at the BST pin for higher efficiency.
When selecting components, ensure the maximum voltage rating of external components matches the input voltage.
When selecting voltage divider resistors, accuracy should not be lower than 1%, and feedback lines should be carefully considered during PCB layout. When
selecting output capacitors and diodes, pay attention to their rated current values; they should not be less than or close to the actual output current, otherwise, severe overheating may occur.
PCB layout should ideally follow the datasheet. Input and output GND should ideally be on a single copper trace. Note that power supply isn't limited to VIN and 3.3V; any output from a chip pin is considered power.
Widen the copper trace at power supply locations; for 2A current, at least 50mil is generally recommended. Detailed calculations can be made based on the specific application. Adding
silkscreen to interfaces is recommended to prevent future operational difficulties.