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The ISL85003 and ISL85003A are synchronous buck regulators with integrated high-side and low-side FET’s. The regulator can operate from an input voltage range of 4.5V to 18V while delivering a very efficient continuous 3A current. This is all delivered in a very compact 3x4mm DFN package.The ISL85003 is designed on Intersil’s proprietary fab process that is designed to deliver very low rDS(ON) FET’s with an optimized current mode controller wrapped around it. The high- side NFET is designed to have an rDS(ON) of 65mΩ while the low-side NFET is designed to have an rDS(ON) of 45mΩ. With these two FET’s, the device delivers very high efficiency power to the load.The ISL85003 can automatically switch between DCM and CCM for light load efficiency in DCM. The switching frequency in CCM is internally set to 500kHz.The device provides a maximum static regulation tolerance of ±1% over wide line, load, and temperature ranges. The output is user adjustable, with external resistors, down to 0.8V. Pulling EN above 0.6V enables the controller. The regulator supports pre-biased output. Fault protection is provided by internal current limiting during positive or negative overcurrent conditions, output and input under and overvoltage detection and an over-temperature monitoring circuit. The regulator is available in a small 3x4mm Dual Flat No-Lead (DFN) package.
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