Usb Lithium Ion Battery Charging Circuit

Tp4056 is a fully linear constant current constant voltage charger for a single cell li ion lipo lithium polymer batteries.

Usb lithium ion battery charging circuit. It is available in 8 pin sop package and requires very minimum external components in order to build a lithium ion battery charger circuit. Charging is performed in three stages. When the ic 555 is used as a comparator its pin 2 and pin 6 become effective sensing inputs for detecting the lower and the upper voltage threshold limits depending upon. Tp4056 is a complete constant current constant voltage linear charger for single cell lithium ion batteries.

First a preconditioning charge then a constant current fast charge and finally a constant voltage trickle charge to keep the battery topped up. This is a lithium ion and lithium polymer battery charger based on the mcp73833. First connect the battery across the indicated points and then plug in the usb connector with your computer s usb socket. The tp4056 is a low cost lithium ion battery charger controller ic.

Connected 3v lithium ion batteries in series will produce a high voltage with less size and easy to transport. Mcigicm 5pcs micro usb 5v 1a 18650 tp4056 lithium battery charger module charging board with protection dual functions 1a li ion 4 6 out of 5 stars 112 5 99 5. Lithium ion batteries are very powerful and compact in size which is very useful in today s electronics. This charger circuit operates using power from the usb source pc.

The green led should instant become on indicating the battery is being charged. Once the circuit is assembled and set up the below shown design can be used for charging any spare li ion battery through the usb port. It supports a constant current constant voltage charging mechanism for s single cell li ion battery. Its sop package and low external component count make the tp4056 ideally suited for portable applications.

Additionally tp4056 is compatible with micro usb as well as adapter. It uses a usb mini b for connection to any computer or usb wall adapter. For safety reasons most batteries should be charged at between 0 5c and 0 7c. The battery charger circuit is designed around a dedicated lithium ion battery charger tp4056 ic.

Most lithium ion batteries are charged to 4 2v per cell higher voltages could increase capacity but reduce service life. When charging it s basically the same charging a 2400mah battery at a maximum current of 1200ma would be a 0 5c charge rate. Its low external component count and small outline package make it perfect for portable applications. The following li ion battery charger circuit very efficiently follows the above conditions such that the connected battery is never allowed to exceed its over charge limit.