Tag Archives: 3.3V

uBoost Single AA to 3.3v 100mA Power Supply

µBoost is a Single AA powered, 3.3v 100mA power source and flashlight and it can run low power devices.

µBoost is small, portable, 3.3v 100mA power source for low power devices like Arduino Mini. It has white power LED and can usable as flashlight. Also it has “Battery OK” indicator that asserts when the battery voltage drops below 0.9v.

There is a 3mm hole on top, so you can hang it easily. You can simply turn it on/off by pressing the power button. It works as flip-flop.

uBoost Single AA to 3.3v 100mA Power Supply – [Link]

3.3V @ 1.5A Buck Regulator

The circuit presented here is based on LTC3601, a high efficiency, monolithic synchronous buck regulator from Linear Technology. The circuit operates at an input voltage ranging from 4V to 15V, this makes it suitable for a wide range of power supply applications. It is capable of producing a output voltage of 3.3V. Burst Mode operation and forced continuous mode are the two types of operational modes available in LTC3601.


  • Input(V): 4VDC to 15VDC
  • Output(V): 3.3VDC
  • Output load: 1.5A
  • PCB:35mm X 25mm

3.3V @ 1.5A Buck Regulator – [Link]

2.5V-4.2V input to 3.3V output – 1A Buck Boost Converter using LTC3441

This circuit can produce an output of 3.3V and 1A current continuously for a voltage input varying from 2.5V to 4.2V. The LTC3441 is a high efficient buck boost converter which plays a vital role in portable instrumentation because of its fixed frequency operation. This circuit produces the output from a single Li-ion battery. Multiple cells can also be used within the specified range of input voltage.


  • Input(V): 2.5V DC to 4.2V DC
  • Output(V): 3.3V DC
  • Output load: 1A
  • PCB:21mmX12mm

2.5V-4.2V input to 3.3V output – 1A Buck Boost Converter using LTC3441 – [Link]

Bi-Directional Voltage Level Translator


Lukas Fassler from Soldernerd shares his experience designing a bi-directional voltage level translator and manufacturing the board with DirtyPCBs.

While most of my microcontroller designs run on 3.3 volts there is still the occasional 5 volt design. Or I do something with an Arduino. So the need may arise to interface between logic working at different voltage levels. There are several ways of doing this, depending on your needs. Things are relatively simple as long as you know in advance which side is transmitting and which side is receiving. It gets more difficult if the communication is bi-directional or with buses such as I2C that are bi-directional by nature.

Bi-Directional Voltage Level Translator – [Link]

3.3V to 30V DC/DC converter using SN6505A


Bob tipped us with his latest project. It’s a 3V3/30V DC/DC converter using SN6505A from TI.

Recently I’v got my samples of SN6505A, it’s a really nice IC, so I decided to make a simple DC/DC converter to get familiar with it. What I like in this chip is that it can operate on input voltage as low as 2,5V – that makes it great for battery devices. It’s also nice, that it’s a very minimalist design – on primary side all what is needed is decoupling capacitor. One disadvantage is that it doesn’t have a feedback loop.

3.3V to 30V DC/DC converter using SN6505A – [Link]

Low voltage power supply


Dilshan Jayakody has build a low voltage power supply that is able to provide four outputs:  1.5V, 1.8V, 2.5V and 3.3V. This power supply can be used to power low voltage mcus, CPLDs and analog ICs. He writes:

In this post we introduce simple and flexible, regulated low voltage power supply unit. This power supply has provision for 4 outputs such as 1.5V, 1.8V, 2.5V and 3.3V. We mainly build this low voltage power supply unit to test (and power-up) low voltage MCUs, CPLDs and radio receivers. For this power supply we choose 1.8V, 2.5V and 3.3V to get it compatible with most of the LVTTL/LVCMOS devices. Other than that, we include 1.5V because there are several analog ICs are available for that voltage level.
This power supply unit is based on LM1117/AMS1117 voltage regulator series and for this design we use AMS1117-1.5, AMS111-1.8, AMS1117-2.5 and AMS1117-3.3 fixed voltage regulators. Except to above regulators this board can be use with AMS1117-2.85 and AMS1117-5.0 regulators.

Low voltage power supply unit – [Link]