The ISL62870 IC is a Single-Phase Synchronous-BuckPWM voltage regulator featuring Intersil’s Robust RippleRegulator (R3) Technology™. The ISL62870 provides a lowcost solution for compact high performance applications.Thewide 3.3V to 25V input voltage range is ideal for systemsthat run on battery or AC adapter power sources. Resistorprogrammed output voltage setpoint and capacitorprogrammed soft-start delay allow for fast and easyimplementation. Robust integrated MOSFET drivers andSchottky bootstrap diode reduce the implementation area andlower component cost.Intersil’s R3 Technology™ combines the best features ofboth fixed-frequency and hysteretic PWM control. The PWMfrequency is 300kHz during static operation, becomingvariable during changes in load, setpoint voltage, and inputvoltage when changing between battery and AC adapterpower. The modulators ability to change the PWM switchingfrequency during these events in conjunction with externalloop compensation produces superior transient response.For maximum efficiency, the converter automatically entersdiode-emulation mode (DEM) during light-load conditionssuch as system standby.
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