Alpha & Omega Semi Enters The Boost Regulator Market

Alpha & Omega Semiconductor, Inc. (AOS) introduced AOZ1905, their first regulator in the EZBoost™ family. The new device is suitable for high efficiency dc-dc 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, set top boxes and TV tuners.

"The AOZ1905 EZBoost regulator integrates a low RDS(on) boost FET capable of output voltages as high as 24V while enabling up to 3% higher efficiency compared to competing devices with similar current rating," said Alan Moore, Marketing Manager of Power IC products at AOS. "This new EZBoost regulator complements our highly successful EZBuck™ family. AOS now has complete dc-dc converter solutions for a wide variety of consumer and industrial applications. We are already shipping this product in volume to our key customers."

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

The current-mode control is said to ensure easy loop compensation and fast transient response. The AOZ1905 works from a 2.7 to 5.5V input voltage range and generates an output voltage as high as 24V. The built-in 0.15Ω/2.4A MOSFET can achieve greater than 90% 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 3 x 3mm DFN package. Pricing in 1000 piece quantities starts at $0.95 for the MSOP, and US$0.99 for the DFN package.