What is the USB current strength of a smartphone / tablet?

A

Artem Bulanov2015-02-04 16:05:34

Do it yourself

Artem Bulanov, 2015-02-04 16:05:34

In general, there is an idea to make a small USB-powered flashlight, but not from a USB PC or a power adapter for charging mobile devices. And from the mobile devices themselves. But I don’t know what current strength and what voltage the phone or tablet itself gives out. More specifically, my devices are "HIGHSCREEN BOOST II SE" and "LG Google Nexus 5 16Gb".

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5 answer(s)

A

Armenian Radio, 2015-02-04
@gbg

Through USB OTG, an unconfigured (simply connected to power, but not registered as a USB device in the system) something can draw 150 milliamps maximum.
Specification , page 36.

S

Stanislav Fateev, 2015-02-04
@svfat

A

Andrey Ermachenok, 2015-02-04
@eapeap

what current strength and what voltage does the phone or tablet itself give out

I think none. They only take and give nothing back. These are the bastards...

A

Andrey Kirilchuk, 2015-02-12
@Kirilchuk

The voltage there will be no more than 5 volts exactly, this is the USB standard, and the current will depend on you according to Ohm's law.
Of course, only if you can get the onboard voltage of the device on the usb input ports

B

Belkinsword, 2021-03-21
@Belkinsword

https://tech-geek.ru/usb-power-delivery/