The EH4205 Micropower Step Up Low Voltage Booster Module, part of the EH4200 Series of Micropower Step Up Low Voltage Boosters, is a self-powered voltage-booster module that converts a low DC voltage input to a higher AC or DC voltage output suitable for many low-power energy harvesting applications using photodiodes, thermoelectric or electromagnetic generators as the input source. The EH4205 does not need a separate power supply to operate and it derives its power directly from the low input voltage source. The EH4200 Series draws input power levels starting at as low as 200μW, which enables an on-board self-starting oscillator.The EH4205 features nominal input impedance of 50Ω, making it suitable for many different energy generating sources. The EH4200 Series is part of a growing family of Micro-power Step Up Low Voltage Booster Modules, Energy Harvesting Modules and Energy Harvesting Integrated Circuits.The EH4205 is designed primarily for driving loads such as the ALD EH300/EH301 Series Energy Harvesting Modules. The AC outputs of the EH4205 are connected directly to the input terminals of the EH300/EH301 Series Energy Harvesting Modules with a two-wire cable. They can also be used for trickle-charge applications such as battery charger or super-cap charger, including situations where the energy input is not well controlled or regulated.For certain applications, the EH4205 can also be used without the EH300/EH301 Series Energy Harvesting Modules. The EH4205 self-starting oscillator oscillates at a natural frequency of about 9KHz,which depends on the source impedance, the source voltage, the loading at the output and the resonating components on board the EH4205. The oscillator waveform iscoupled to a transformer inside the module that provides an AC output signal that is limited in amplitude by the output loading. A typical output loading is a full wave rectifier that can handle AC inputs up to 20V and input power as limited by the output of the EH4205. For many energy-harvesting applications, the EH4205, combined with EH300 Series Energy Harvesting Modules, offers a simple and efficient solution when used with a low-voltage low-energy generating source that only delivers sporadic intermittent amounts of input power. The combined EH4205 and EH300 Series Modules can ramp from zero output power to useable levels for operating.