Designing a Li-Ion and USB Power Circuit with Built-in Charging

This video series will take you step by step through how to design a circuit that can be powered from a USB input (5V) or from a Lithium Ion battery cell and output a regulated 5V. The design includes a battery charging circuit and a circuit that automatically isolates the battery from the power bus when USB power is applied.

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In part one we review the overall plan for the design, go over Li-ion battery cell basics, and give a crash course on boost switching voltage regulators.

Battery university link: https://batteryuniversity.com/

In part two we go into detail on our boost switching regulator design using Texas Instruments TPS61202 5-V fixed output voltage boost converter.

Link to TI’s TPS61202 product page: https://www.ti.com/product/TPS61202?qgpn=tps61202

In part three we look at the battery charging circuit and the power source isolation circuit

Link to MAX1898 battery charging IC datasheet: https://www.mouser.com/datasheet/2/256/MAX1898-1515496.pdf

In part 4 we look at the PCB layout for our circuits and we see a demo of our circuits in action

Circuit Block Diagram

Ultimate Battery Circuit Design Part 2

In this video series we build the ultimate battery circuit that can handle various battery chemistry's, charge batteries, perform load sharing during charging, handle input voltage levels that are higher or lower than the output, and more. In part 2 we will look at the PCB layout with a focus on the buck boost DC to DC Converter and look at the BOM.

Ultimate Battery Circuit Design Part 1

In this video series we build the ultimate battery circuit that can handle various battery chemistry's, charge batteries, perform load sharing during charging, handle input voltage levels that are higher or lower than the output, and more. In part 1 we will look at the circuit configuration and component values that we plan to use.