The Adafruit QT 3V to 5V Level Booster Breakout lets you connect 3.3 V STEMMA QT / Qwiic devices to sensors and peripherals that require 5 V power or logic. Most modern microcontrollers (ESP32, RP2040, SAMD, micro:bit) run at 3.3 V, but some sensors and modules still need 5 V — this board bridges the gap with a charge-pump boost regulator and I2C level shifting.

On the input side, connect your 3.3 V STEMMA QT / Qwiic cable. In the middle, the AP3602A charge-pump regulator boosts power to 5 V (100 mA continuous, 250 mA peak) while level-shifting circuitry translates I2C signals. The output side provides 5 V power and 5 V I2C logic to your device. A solder jumper on the back lets you keep I2C logic at 3.3 V if only the power needs boosting.

Key Features

• 3.3 V to 5 V Boost – AP3602A charge-pump regulator provides 100 mA continuous (250 mA peak) at 5 V
• I2C Level Shifting – Safely translates 3.3 V I2C signals to 5 V logic
• STEMMA QT / Qwiic Connectors – Plug-and-play I2C on both sides; no soldering required
• Configurable Logic Level – Solder jumper to set output I2C to 3.3 V when only power boosting is needed
• Breadboard Friendly – Breakout pins for prototyping; doubles as a QT-to-perfboard adapter

Ideal For

• Connecting 5 V sensors to 3.3 V microcontrollers via I2C
• Powering 5 V I2C devices from 3.3 V STEMMA QT / Qwiic systems
• Bridging legacy 5 V modules into modern 3.3 V projects
• Breadboard prototyping with STEMMA QT breakout

Resources

• What is STEMMA QT?