Amazon.com: Mini DC DC 3.7V 5V to 3.3V Step Down Conversion Module Converter 18650 Lithium Batteries for Microcontroller Development Board Power : Electronics
10x Ultra-light Mini Dc 3.5-5v To 3.3v Dc-dc Converter Step Down Buck Regulator Ldo Module For Ams1117 18650 Li-ion Esp8266 - Integrated Circuits - AliExpress
Amazon.com: Mini DC DC 3.7V 5V to 3.3V Step Down Conversion Module Converter 18650 Lithium Batteries for Microcontroller Development Board Power : Electronics
Amazon.com: Mini DC DC 3.7V 5V to 3.3V Step Down Conversion Module Converter 18650 Lithium Batteries for Microcontroller Development Board Power : Electronics
Adapating a single cell Li-ion battery voltage to 3.3V low power application - Electrical Engineering Stack Exchange
Mini Dc Dc Step-down Converter 3.7v 5v To 3.3v 18650 Lithium Batteries | Fruugo US
2x 3.3-6v To 3v Dc-dc Step-down Power Supply Buck Ldo Module Voltage Regulator Board For 18650 Li-ion Aaa Dry Cell Batteries - Integrated Circuits - AliExpress
30pcs Mini DC 3.5-6V to 3.3V Converter Step Down Buck Regulator LDO Module Voltage
BM 18650 + LDO 3.3V Resources - EasyEDA
It Just Got Easier to Convert Lithium-Ion Battery Voltage to 3.3V with this Efficient Single Inductor Synchronous Buck-Boost Regulator | Analog Devices
2pcs Auto Buck-boost Dc Dc Converter Voltage Regulator Module 0.9-6v To 3.3v For 18650 Solar Charger Li Lion Battery - Integrated Circuits - AliExpress