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A New Approach to Circuit Breaker Design Using Silicon Carbide Switches - Nov 21
Mechanical circuit breakers can be low cost with minimal losses, but they operate slowly and wear out. Solid state versions overcome the problems and are becoming increasing viable as replacements at...
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Power Electronics Europe News
High current, buck-boost regulators are low voltage for battery operation
They feature 4.5A switches, best-in-class efficiency up to 96%, and a compact footprint to provide system power or to power the peripherals in battery-operated devices, says the company. The regulators are also claimed to offer the industry’s lowest quiescent current of 30µA for light load efficiency.

They are available in compact QFN and WLCSP packages. Both operate in buck, boost or buck-boost mode, depending on the relation between input and output voltages. Transition between modes is smooth, says the company, to prevent noise and glitches. This capability, and light load efficiency with low quiescent current, improves battery life by reducing power drain and heat dissipation in portable and mobile applications.

The wide input voltage range of 1.8 to 5.5V supports multiple battery topologies, while the output voltage range of 1.0 to 5.2V is combined with a 3A output current. 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 and ringing suppression for EMI performance.

The ISL91127IR is available now in a 4.0 x 4.0mm, 20-pin QFN package; the ISL91127 is also available in a 20-bump, 2.15 x 1.74mm WLCSP. Evaluation boards are also available, the ISL91127IRN-EVZ is a fixed 3.3V evaluation board and ISL91127IRA-EVZ is an adjustable voltage evaluation board. The ISL91128 is available now in a 20-bump, 2.15 x 1.74mm WLCSP.




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