ISL8025 / ISL8025A Synchronous Buck Regulators

Renesas Electronics ISL8025 / ISL8025A Synchronous Buck Regulators are highly efficient, monolithic, synchronous step-down DC/DC converters that can deliver 5A of continuous output current from a 2.7V to 5.5V input supply. These Intersil devices use current mode control architecture to deliver a very low duty cycle operation at high frequency with fast transient response and excellent loop stability. ISL8025 / ISL8025A integrates a very low ON-resistance P-Channel (45mΩ) high-side FET and N-Channel (19mΩ) low-side FET to maximize efficiency and minimize external component count. The 100% duty-cycle operation allows less than 225mV dropout voltage at 5A output current. The operation frequency of the pulse-width modulator (PWM) is adjustable from 500kHz to 4MHz. The default switching frequency, which is set by connecting the FS pin high, is 1MHz for the ISL8025 and 2MHz for the ISL8025A.