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The Intersil ISL80030 and ISL80031 are highly efficient, monolithic, synchronous stepdown DC/DC converters that can deliver 3 A of continuous output current from a 2.7 V to 5.5 V input supply. They use current mode control architecture to deliver a very low duty cycle operation at high frequency with fast transient response and excellent loop stability. The ISL80030/1 integrates a very low ON-resistance P-Channel (70 mΩ) high-side FET and N-Channel (60 mΩ) low-side FET to maximize efficiency and minimize external component count. The 100% duty-cycle operation allows less than 210 mV dropout voltage at 3A output current. The operation frequency of the pulse-width modulator (PWM) is 1 MHz for non-A version and 2 MHz for the A version.
The ISL80030 is configured forced continuous operation and ISL80031 for discontinuous operation at light load. Forced continuous operation reduces noise and RF interference, while discontinuous mode provides higher efficiency by reducing switching losses at light loads. Fault protection is provided by internal hiccup mode current limiting during short circuit and overcurrent conditions. Other protection, such as overvoltage and over-temperature, are also integrated into the device. A power-good output voltage monitor indicates when the output is in regulation.
The ISL80030 and ISL80031 are offered in a space saving 8 Ld 2x2 Pb-free DFN package with an exposed pad for improved thermal performance and 0.8 mm maximum height. The complete converter occupies less than 40 mm2 area.