Single Cell Lithium Batt Charger – The Longhorn Engineer https://longhornengineer.com Robotics, Pinball, Hacking, Portables Tue, 20 Dec 2022 20:12:51 +0000 en-US hourly 1 Single Cell Lithium Battery Charger Circuit Ver 1.2 Released! https://longhornengineer.com/2012/05/30/single-cell-lithium-battery-charger-circuit-ver-1-2-released/ Thu, 31 May 2012 02:48:18 +0000 https://longhornengineer.com/?p=1156 Continue reading Single Cell Lithium Battery Charger Circuit Ver 1.2 Released! →]]> This circuit is designed around the MCP73837 chip. There are a couple different versions of this chip which allows the same PCB have a charge cut off voltage of 4.2V for normal lithium batteries and 4.35V for high capacity lithium batteries.

4.20V – MCP73837-NVI/UN
4.35V – MCP73837-FCI/UN

It charges via USB at a rate of 500mA or an external power supply rated at 5-6V at 1A. I would use a power supply at a rating of at least 1.2A for this charger.

Added a micro usb plug to compliment the mini usb plug and DC power jack. Made all the passive parts 0805 size to make the board easier to assemble. Tweaked the mounting holes a bit as well.

Files (Eagle V6)

PCB V1.0
Schematic V1.0

PCB V1.1
Schematic V1.1

PCB V1.2
Schematic V1.2

PCB Change Log

]]> Lithium Battery Charger Gets a Home https://longhornengineer.com/2012/04/28/lithium-battery-charger-gets-a-home/ Sat, 28 Apr 2012 16:50:52 +0000 https://longhornengineer.com/?p=920 Put together the project page for the Single Cell Lithium Battery Charger Circuit.

This project is open source and all the files and part lists needed to make the board are located on that page.

Already updated the PCB to Ver1.1. Forgot a ground trace.

]]> Single Cell Lithium Charger Circuit https://longhornengineer.com/2012/04/28/single-cell-lithium-charger-circuit/ Sat, 28 Apr 2012 06:22:46 +0000 https://longhornengineer.com/?p=902

This circuit is designed around the MCP73837 chip. There are a couple different versions of this chip which allows the same PCB have a charge cut off voltage of 4.2V for normal lithium batteries and 4.35V for high capacity lithium batteries.

Here are the eagle files.
PCB V1.0
Schematic V1.0

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