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Step up 3.3V to 5V for digital I/O - Electrical Engineering Stack Exchange
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Step-Up/Step-Down Charge Pump DC/DC Converter Provides up to 150mA in a Tiny 2mm × 2mm DFN Package | Analog Devices
Pololu 3.3V Step-Up/Step-Down Voltage Regulator S7V8F3
Step up 3.3V to 5V to use as power of op-amp - Electrical Engineering Stack Exchange
DCDC 1.5V 1.8V 2.5V 3V 3.3V 3.7V 4.2V To 5V Step-Up Voltage Converter Module DIY 699940509966 | eBay
Step-UP Power Converter Voltage Module ( Input 1-3.3V ) (Output 3.3V ) DC-DC [TB131] - USD $3.99 : canton-electronics.com
Pololu 3.3V Step-Up Voltage Regulator U1V11F3
Pololu 3.3V Step-Up Voltage Regulator U1V10F3
3.3V Step-Up/Step-Down Voltage Regulator S9V11F3S5 - Opencircuit
3,3V Step-Down & Step-Up Converter - Opencircuit
Mini DC-DC Boost Step Up Converter 1.5v-3v to 3.3v 5v Dual Output Power Supply | eBay