TPS63900 buck-boost converter

This small breakout board based on the TPS63900 IC makes it a breeze to convert the voltage from a lipo to 3.3V or 5V at significant efficiency even at ultra-light-loads, hence very little energy is wasted in the form of heat.

Although the max. current is limited to 400mA, it comes at an incredible IQ (quiescent current) of only 75nA, making it suitable for devices which depend on deep-sleep, such as the ESP32.

With an input range from 1.8 to 5.5V, this is perfect for a lipo, though there are several other battery chemistries which can work with this. Note that this is not a lipo-charger, only a highly efficient buck-boost converter. Switching between 3.3V and 5V is easy thanks to the slide switch. The other switch disables the IC.

With it's 4 mounting holes having a 2.5mm hole diameter, it can be easily integrated into 3d-prints or mounted easily via screws. Size: 25x25cmm with a height of less than 5mm. Did I mention this is breadboard friendly? All used components and the pcb itself are ROHS certified.

A useful way to get 3.3V and 5V out of a lipo

A lot of times, you find your electronic project in need for power, more power and ultimately a lipo. Lipos can store a lot of energy, but their voltage range varies from 4.3-ish volts to 2.8V-ish. The voltage close to the max and min fluctuates a lot. Hence, many micro-controllers like the ESP32 rely on 3.3V while others like the Arduino require 5V and therefore have difficulties being powered by a lipo alone due to either over-voltage or under-voltage.

This small, breadboard-friendly breakout board solves this issue by efficiently converting the input voltage from as low as 1.8V to 5.5V to the desired voltage, which can be set by the switch.

There's a total of 4 pins on this, VIN for the input voltage (+), VOUT for the output voltage (+) and two ground pins.

Features

• small size (25x25mm)
• high-efficiency (90%+) at both low-loads (10uA) and high-loads (up to 400mA)
• select output voltage without soldering through switches
• extremely low no-load consumption of ~400nA (yes Nano-Amps!, not micro-Amps)
• input voltage range from 1.8V to 5.5V
• includes on/off switch
• 4x mounting holes with 2.5mm diameter
• slim (5mm total height)
• breadboard-friendly (select pre-soldered headers)