Intersil Corporation announced the ISL91127 and ISL91128 high efficiency buck-boost regulators. The latest in Intersil's industry-leading buck-boost family, the new devices feature 4.5A switches, best-in-class efficiency up to 96%, and a compact footprint ideal for providing system power or powering the peripherals in battery-operated devices. They offer the industry's lowest quiescent current of 30µA for superior light load efficiency.

The ISL91127 and ISL91128 operate in buck, boost or buck-boost mode, depending on the relation between input and output voltages, and provide smooth transitions between modes to prevent noise and glitches. This capability, combined with patented Intersil technology for delivering superior light load efficiency with ultra-low quiescent current, maximizes efficiency under all conditions. This is essential to improve battery life by reducing power drain and heat dissipation in portable and mobile applications.

The new buck-boost regulators wide input voltage range of 1.8V to 5.5V supports multiple battery topologies, and their wide output voltage range of 1V to 5.2V combined with 3A output current provide the ultimate in design flexibility. The ISL91128 also features I2C programmable dynamic output voltage adjustability, which eliminates feedback resistors and allows the reuse of the same design for multiple output voltage needs.

The ISL91127IR is available now in a 4mm x 4mm, 20-pin QFN package and is priced at $1.29 USD in 1k quantities. The ISL91127 is also available in a 20-bump, 2.15mm x 1.74mm WLCSP package priced at $1.25. The ISL91127IRN-EVZ fixed 3.3V evaluation board and ISL91127IRA-EVZ adjustable voltage evaluation board are available for purchase.

The ISL91128 is available now in a 20-bump, 2.15mm x 1.74mm WLCSP package and is priced at $1.25 USD in 1k quantities.