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Regulator aimed at high efficiency DC/DC boost apps

Posted: 10 Jul 2008     Print Version  Bookmark and Share

Keywords:boost regulator  DC/DC boost  FET 

Alpha & Omega Semiconductor Inc. (AOS) has rolled out its first regulator in the EZBoost family.

The AOZ1905 is intended for high efficiency DC/C boost applications such as for providing bias voltages in LCD panel power for handhelds, notebooks, monitors and TVs as well as for general purpose boost applications in personal navigation devices, power tools, STBs and TV tuners.

According to AOS, the AOZ1905 EZBoost regulator integrates a low RDS(on) boost FET capable of output voltages as high as 24V while enabling up to 3 per cent higher efficiency compared to competing devices with similar current rating.

The AOZ1905 current-mode, constant frequency boost regulator has a switch current limit of 2A. It has a pin selectable switching frequency of 600kHz or 1.2MHz to optimise efficiency and external component size depending on the application requirements.

The current-mode control ensures easy loop compensation and fast transient response. The AOZ1905 works from a 2.7V to 5.5V input voltage range and generates an output voltage of 24V. The built-in 0.15Ω/2.4A MOSFET can achieve greater than 90 per cent efficiency. Other features include input under-voltage lockout, cycle-by-cycle current limit, thermal shutdown and soft-start.

The AOZ1905 is available in a 8-pin MSOP or 10-pin 3mm x 3mm DFN package.

Pricing in 1,000-piece quantities starts at 95 cents for the MSOP, and 99 cents for the DFN package. Devices are availability now.

- Ismini Scouras

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