Mini portable adjustable power supply

Project Introduction:
This project uses the MT3608 to create a low-cost, portable, adjustable power supply.
For information on the buck-boost principle, please see this video: [SEPIC Circuit Analysis and Simulation] https://www.bilibili.com/video/BV1uv4y1r7Nf?vd_source=c716ab546a57522bdc77f154f92cfa83.
Low standby power consumption: TP5400 10ua standby, MT3608 1ua standby, with output switch and indicator light.
Project Functions
: TP5400 Function Introduction:
MT3608 Function Introduction:
Project Parameters :
Charging Current: 1A,
5V Output: 1A,
Adjustable Output Voltage Range: 0.6-25V,
Output Power: >5W.
Board Size:
40mm x 40mm
components (22 in total), extremely low cost.
Principle analysis (hardware description).
This project consists of two parts: battery management and DC-DC control.
The advantages of the TP5400 include no output light, dual indicator lights, low power consumption, and the use of the linear charging
MT3608. It is low-cost and requires few external components. EN is turned off via a sliding switch.
Note:

A hand-tightened potentiometer is used. Purchase link: http://e.tb.cn/h.gpEM5oBpdXZ8hol?tk=bueF3heKvjzCZ0001. It needs to be bent slightly.
If no other voltage is used, it can be changed to a fixed output. The resistor needs to be changed to a larger resistor; otherwise, power consumption will be high, and the boost cannot cut off the output. The output inductor
can be selected according to the situation.

Actual product image:
Fixed output version test. Actual product image
: Charging test. Adjust the maximum charging current according to the battery size. Change the resistor.
Slide switch off state: no output, indicator light off. Boost
output test.
Buck output test.