Just a simple power supply board for TLV6213x/TPS6213x buck converter. This converters can support up to 3A of current and are coming in an adjustable or fixed-voltage version. This board is also compatible with TPS6214x/TPS6215x ICs that provide 2A or 1A current respectively.

!!!WARNING!!! My board is designed to show operation of the IC and can support currents up to ~2.25-2.5A only, with that current IC would heat up to ~80-90C if using 1oz copper! If you try to push 3A current through using this board - IC would overheat in several minutes and start thermal shutdown (at about ~100C). You need to either use a heatsink or use a larger area PCB with more vias and 2oz copper.

I really like these power regulators, due to their high frequency (1.25MHz or 2.5MHz selectable with FSW pin) a small-sized inductor can be used, saving space and giving better stability. Output voltage is very stable and not dropping even under highest loads. I've tested both TLV62130 (adjustable) and TPS62133 (5.0V fixed) versions and they work perfectly. Just make sure that if you're using fixed voltage versions of ICs you won't try to charge any USB devices that require lots of current. It turned out that USB cables often have very high resistance causing less than 4.8V to arrive to the end device, thus causing that device to think that voltage is so low because it draws too much current so they start to scale down current themselves. I've encountered this behaviour when trying to charge a Samsung phone when using TPS62133 IC, the phone refused to draw more than ~1A of current. After changing IC to TLV62130 and ramping up output voltage to ~5.4V the phone has started to charge with almost 2A of current.

Another thing to be aware of is that many devices like Samsung or Apple ones require specific voltages on D+ and D- pins, even though they follow BC1.2 standards just shorting D+ to D- won't usually work. I had to use 33kOhm pullup to D+ and 10kOhm pull-down to ground to bring D+ and D- lines (shorted together) to ~1.2V to make Samsung phones and tablets to think it's an original Samsung 5V charger and start drawing more than 0.5A. With Apple devices it's not this simple, you'd probably have to change schematic as D+ and D- have to be brough to different voltages for Apple to recognize charger as approved one and draw more than 0.5A. See picture below as an example:

If you really want to make a universal charger you need to use additional IC like TPS2514 (http://www.ti.com/product/TPS2514) that can negotiate D+ and D- lines as required by downstream device.

All the pins of IC are protected from static and can tolerate high voltages. Control pins (EN, FSW) have internal pull-down resistors (400kOhm) and can be left floating if not in use. Fixed voltage version is very precise and stable but with correctly selected 1% resistors adjustable version is as stable as the first one.

Always pay attention to thermal considerations when using these voltage regulators especially when used under heavy load and high currents. ICs are smart enough to shut themselves down if overheating but can still heat up to more than 100C.

Keep in mind that input capacitors should have a higher voltage rating than output ones as input rail is usually 12V. IC can work in a very high range allowing to use it with Li-Ion battery to output 1.8V/2.5V/3.3V.

Please feel free to ask any questions to me if you need any help with these ICs. I would highly recommend to use these ICs in your designs, TLV version is a cheaper one with slightly reduced output voltage and less features, but still a great one. Cheers!