The LM3489 is a high efficiency PFET switching regulatorcontroller that can be used to quickly and easily develop asmall, cost effective, switching buck regulator for a wide rangeof applications. The hysteretic control architecture providesfor simple design without any control loop stability concernsusing a wide variety of external components. The PFET architecturealso allows for low component count as well asultra-low dropout, 100% duty cycle operation. Another benefitis high efficiency operation at light loads without an increasein output ripple. A dedicated Enable Pin provides a shutdownmode drawing only 7μA. Leaving the Enable Pin unconnecteddefaults to on.
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