This little buck converter based on the AP3429A is super handy, taking up to 5.5V input and providing a 3.3V output with up to 1.2A current. It’s great for supplying power to popular 3.3V voltage circuits from a range of battery or power options. This chip provides up to 1.2 Amp load current across the entire input voltage range of 3.4 to 5.5V. It’s not a huge range but does cover LiPoly batteries, 3 alkalines, and USB power.
I suggest you update the page for this product because Adafruit updated this product in 2022 due to chip shortage. Nothing significant, except the colour, name and the chip which is used.
Adafruit comment “There’s also an ENable pin, tie it low to shut down the output completely”. Does this mean that the EN has to be connected to Vin for it to work, or can EN be left unconnected ?
And finally, if I connect the GND and Vin pins to a 5v source … should I get 4.2v out between GND and 3V pins ?
