Features

DC-DC step-down converter module, based on ST1S41 chip.

• 4 A output current
• 4.0 V to 18 V input voltage
• Output voltage adjustable from 0.8 V
• 850 kHz switching frequency
• Internal soft-start
• Integrated 95 mΩ and 69 mΩ power MOSFETs
• P-channel high-side MOSFET
• Cycle-by-cycle current limiting
• Current foldback short-circuit protection
• Maximum duty cycle 100%
  
  

This module is designed for experiments and for embedding in various DIY devices.

Project Overview (English subtitles): https://youtu.be/Lil3r53FUU0

Summary

Powerful (4 A) DC-DC step-down switching regulator, with high PWM frequency and low ripple. Can be controlled by an external controller via the Enable input. Able to produce 100% duty cycle and work effectively at low and high loads. The efficiency of the chip increases due to its synchronous circuit and a p-channel high-side MOSFET and thanks to this it can continuously keep it open without needing a bootstrap capacitor.

Excellent chip for adjusting the output voltage from 0.8V to the Vin.

Links

Project Overview (English subtitles) - https://youtu.be/Lil3r53FUU0

Datasheet - https://www.st.com/resource/en/datasheet/st1s41.pdf

Component values calculation - https://drive.google.com/drive/folders/1RC5eWVdJe1vk0HYx3-bhCfRPN9aAa3wc

Buck-Converter Design Demystified By Donald Schelle and Jorge Castorena - https://www.electronicdesign.com/technologies/dc-dc-converters/article/21188914/buckconverter-design-demystified

Buck Converter Design - https://www.mouser.de/pdfdocs/BuckConverterDesignNote.pdf

Optimizing Transient Response of Internally Compensated dc-dc Converters With Feedforward Capacitor - https://www.ti.com/lit/an/slva289b/slva289b.pdf

Components

SMD Capacitor Sample Book - https://ali.ski/l-lE9

SMD Resistor Sample Book  - https://ali.ski/6YxlCV

Single Row male straight 2.54mm socket, 40 pin - https://ali.ski/vTH2b

2.54mm Jumper - https://ali.ski/XfxtVj