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USB Converter

USB Converter

Does this sound familiar: you buy a small piece of equipment, such as a programming & debugging interface for a microcontroller, and you have to use a clunky AC wall adapter to supply it with power? It’s even worse when you’re travelling and there’s no mains socket anywhere in sight. Of course, you can use the USB bus directly as a power source if the supply voltage is 5 V. If you need a higher voltage, you can use the USB converter described here. This small switch-mode step-up converter can generate an output voltage of up to 15 V with a maximum output current of 150 mA.

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Component list

(for Uo=9 V)


Resistors: (all SMD 1206)

R1 = 1 Ohm

R2 = 1 Ohm

R3 = 1 Ohm

R4 = 220k

R5 = 82k

R6 = 10k


Capacitors: (all SMD 1206)

C1 = 100n

C2 = 2n2

C3 = 22p

C4 = 100n

C5 = 1n5


Tantalum capacitors: (all SMD 7343)

C6 = 68µ/20 V

C7 = 68µ/20 V

C8 = 68µ/20 V

C9 = 47µ/16 V

C10 = 47µ/16 V

C11 = 68µ/20 V



L1 = 820 µH (SMD CD105)

L2 = 47 µH (SMD 2220)


D1 = SK34SMD Schottky

IC1 = LM3578AM (SMD SO8)


K1 =  2-way PCB terminal brlock, lead pitch 5mm (optionnal)

K2 = USB-B-connector

Download for free the PCB layout (070119-1.pdf)



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