The Max761 is a 300kHz fixed frequency boost regulator that integrates a N-channel power MOSFET which allows peak currents up to 1A. In the standard application circuit the IC is powered from the output voltage ( bootstrapped mode ) and provide a fixed output of 12V (FB pin is connected to ground). For a 13.5V output voltage, the IC is powered from the supply voltage ( non- bootstrapped mode ), external resistor divider must be used as you can see in the follow circuit diagram:
DC-DC boost converter circuit with max761
With an input voltage of 4.5V to 5V, this circuit it produces a 13.5V output voltage at a load current of 150mA. The proprietary current-limited PFM control scheme provide a high efficiency, typically over 80%. The output voltage can be calculated using this formula:
Printed circuit board for the max761 boost converter
The C2 capacitor must be rated at least 16V, my last 33uF/16V capacitor it burnt with a nice yellow-red flame accidentaly. I must to use a 47uF/16V capacitor instead.
Download schematic in pdf format from here.More voltage convertors: