MP2233 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS

MP2233 Rev. 1.01

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12

12/6/2012

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Startup and Shutdown

thresholds, the chip starts. The reference block

starts first, generating stable reference voltage

and currents, and then the internal regulator is

enabled. The regulator provides stable supply

for the remaining circuitries. The frequency

starts up smoothly.

Three events can shut down the chip: EN low,

shutdown procedure, the signaling path is first

blocked to avoid any fault triggering. The

COMP voltage and the internal supply rail are

then pulled down. The floating driver is not

subject to this shutdown command.