MP2229 – 21V, 6A SYNCHRONOUS STEP-DOWN CONVERTER

MP2229 Rev. 1.0

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2/12/2015

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placed between SW and the BST capacitor is

recommended strongly to reduce the SW spike

voltage and noise.

FIGURE 5. Internal Bootstrap Charging Circuit

Start-Up and Shutdown

thresholds, the chip is enabled. The reference

block starts up first, generating a stable

reference voltage, and then the internal regulator

is enabled. The regulator provides a stable

supply for the remaining circuitries.

Three events can shut down the chip: EN low,

signaling path is blocked first to avoid any fault

triggering. The COMP voltage and the internal

supply rail are then pulled down.