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Dynamic Siphon Steals Current from USB Port

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Abstract: This circuit exploits all the power available from a USB port by dynamically adjusting the amount of current delivered to the load, thereby siphoning a relatively constant (and maximum) current from the USB port. Included are a current-sense amplifier (MAX4173), voltage reference (MAX6129), and precision op amp (MAX4238).
Maxim > App Notes > Amplifier and Comparator Circuits Interface Circuits Voltage References
Keywords: USB ports, USB-port power, current-sense amplifiers, voltage references, op amps, n-channel MOSFETs Jan 05, 2011

APPLICATION NOTE 4563
Dynamic Siphon Steals Current from USB Port


Abstract:This circuit exploits all the power available from a USB port by dynamically adjusting the amount of current delivered to
the load, thereby siphoning a relatively constant (and maximum) current from the USB port. Included are a current-sense
amplifier (MAX4173), voltage reference (MAX6129), and precision op amp (MAX4238).

A similar version of this article appeared in the Decmeber 15, 2006 issue of EDN magazine.

USB ports can be a handy source of 5V power. Not only can a USB port power a ……
标签:MaximUSBportsUSB-portpowercurrent-senseamplifiersvoltagereferencesopampsn-channelMOSFETs
Dynamic Siphon Steals Current from USB Port
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