USB to 2.1mm DC Booster Cable - 9V
PRODUCT ID: 2777
Description
This cable is kinda fascinating ‐ it has an integrated boost converter, so you can plug it into any USB
port (from a computer, battery pack, etc) and it will give you a higher DC voltage! It's a handy way to
power 9V powered devices with a center‐positive 2.1mm DC barrel jack from a USB port. We also have
a version that provides 12V, and if you just need a passthough cable, here's one for 5VDC.
These are rated at 500mA output, but you can go a little higher, we pulled 700mA and we got a little
voltage droop but it worked fine. Probably best not to draw 700mA continuously though!
Here's our measurements for various current draws when we set our bench supply to provide a steady
5V voltage
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50mA (9.0V output), 100mA, 90% efficiency
100ma (8.95), 205mA in, 87% efficiency
200ma (8.9V): 410mA in, 86% efficiency
300ma (8.8V): 620mA in, 85% efficiency
500ma (8.8V): 1060mA in, 83% efficiency
700ma (8.8V): 1550mA in, 80% efficiency
So, overall there's a 90% efficiency at low current draw that drops do about 80% at high current use.
There's also a 3 mA quiescent current. Note that often times the USB port voltage can droop too, and in
addition you may have power losses with any thin or low quality cables with high resistivity!
Technical Details
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Cable Length: ~1.2m / ~47"
Weight: 35.1g
https://www.adafruit.com/product/2777 10‐30‐17
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