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Charging solution

Jonathan Frech
Prodigy 130 points


Im working on a new circuit that involves a Li-io or Li-Po battery, typically a 18650 type (4.2V-2.7V) around 800mAh to 1600mAh.


To minimize the connectors on the circuit, i would like to use USB-Charging. So the maximum charging current would be 400mA

For the mcu and peripherals of the board, a sepic converter is needed to create 3.3V, 100mA with less than 50mV Ripple.

What Battery Charger is best for my application?


Is there a combined product that is a battery charger and integrated sepic converter?

If not, are there any recommend dc-dc sepic converters for use with batteries?

  • 0
    Guru 13040 points
    Jonathan,

    Did you try the Battery Charger selection tool. It is usually a good thing to use that table to narrow down the options, and maybe then get back to the forum to find out the best option given a smaller list.
    www.ti.com/.../battery-charger-ic-products.page
    It is also usually good to check your preferred distributor for availability - that's why "you are the best filter"...

    As for the sepic convertion, maybe you should not take that route... Li_Ion maintains 3.2V+ during "almost all of its available charge" - meaning a simpler buck converter will be able to power your circuit. And you could measure the battery voltage (assuming you have some kind of MCU to take actions?), and when VBAT<3.2 just say "low battery" and switch off. There are some really converters available, try the Webench power supply tool on the web.

    There are chargers with integrated buck: bq2501x family, for example.

    Bruno