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Mini-USB port that charges Lithium-Ion Batteries and provide
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Mini-USB port that charges Lithium-Ion Batteries and provide

by BCBD on Sun Feb 28, 2016 6:36 pm

Hello! I need help with a project I am working on. Basically I need power for the project so I bought a battery: https://www.adafruit.com/product/1578 and I needed a Mini-USB port to power the project so I purchased this: https://www.adafruit.com/products/1905. My project requires 3.3V and the Mini-USB supplies 5V also when I connected the GND and the 5V from the Mini-USB to my project it did not function. I am beginning to think that I ordered the wrong thing when I purchased the Mini-USB LiPo Charger. If anyone can help me out or find a Mini-USB port that can charge a 3.7V 500mAh LiPo battery and using that same port power my project with an output of 3.3V.

BCBD
 
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Joined: Tue Feb 02, 2016 7:30 pm

Re: Mini-USB port that charges Lithium-Ion Batteries and pro

by hiduino on Mon Feb 29, 2016 2:01 am

The 5V pin is an input to the charger. You will need to use the BAT output pin to power your project. It depends on what you are powering in your project, some devices will accept a range of voltages so you might be able to power it directly from the BAT pin.

If you need a regulated 3.3V source, then you could use one of these from the BAT pin.
https://www.adafruit.com/products/2166
https://www.adafruit.com/products/2745
https://www.adafruit.com/products/2165

hiduino
 
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Joined: Sat Sep 01, 2012 7:05 pm

Re: Mini-USB port that charges Lithium-Ion Batteries and pro

by BCBD on Mon Feb 29, 2016 8:17 am

The component of my project requires 3.3V. The battery I have is 3.7V 500mAh. So, you are saying that I connect the GND to GND and the BAT to a regulator then to the 3.3V?

BCBD
 
Posts: 3
Joined: Tue Feb 02, 2016 7:30 pm

Re: Mini-USB port that charges Lithium-Ion Batteries and pro

by hiduino on Mon Feb 29, 2016 3:42 pm

Generally yes. For the linear regulators it is also required to have at 10uF capacitors on the input and output to GND.

Note the Buck converter product is more efficient for battery applications.

hiduino
 
Posts: 862
Joined: Sat Sep 01, 2012 7:05 pm

Please be positive and constructive with your questions and comments.