Here's a long awaited Silergy SY6280A breakout! SY6280 is a power switch that:

• has an "enable" pin
• limits current (set by a resistor)
• doesn't let current flow in the other direction
• doesn't auto-discharge the output

Whether you're building the power rails for your next project, making a test jig that needs to apply power to some precious creation of yours (what I'm doing), or maybe just adding an external current-limited switchable USB port to your Raspberry Pi, this breakout will likely work for you. Much like the AP2553 used on Raspberry Pi (B+ and beyond, except Zero and Zero W), this switch can protect you from hotplug-induced brownouts - power dips that cause your device to reset whenever you plug something into the USB port.

My breakout is breadboard-friendly and self-documenting (using the silkscreen), and it's cheap, too! I will also program the current for you - just pick the current you want in the "Current resistor" dropdown on the right. In case you don't want me to add a resistor, pick the "no Iset resistor" option - until you add an Iset resistor, SY6280 won't do current limiting (according to documentation).

Is 1A enough?

While 1A, admittedly, is not too much when you want to power your "desktop replacement" Pi setup or charge a smartphone, it's still enough current for most needs! For example, a portable 2.5mm HDD (full of spinning rust) will, most likely, consume less than that, and so will a Raspberry Pi without any peripherals attached. Let me know if you have any further questions!

Key characteristics:

• 2.4V <= VIN <= 5.5V
• Maximum current is 1A
• Rds(on) = 80mOhm
• EN is non-inverted (high=enabled, low=disabled)
• No output discharge resistor built-in (since it's the -A version)

This breakout has 100nF capacitors on input and output, as well as a 10K pulldown on EN ( => default off). It also comes with 2x 4-pin headers you can solder onto the breakout to make it breadboard-ready (I can solder it myself if you want, too).