MP2209 – 16V, 2A, 600KHz SYNCHRONOUS STEP-DOWN CONVERTER

MP2209 Rev. 1.01

www.MonolithicPower.com

9

7/11/2013

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Bootstrap (BST PIN)

The gate driver for the high-side N-channel

DMOS power switch is supplied by a bootstrap

capacitor connected between the BS and SW

pins. When the low-side switch is on, the

capacitor is charged through an internal boost

diode. When the high-side switch is off and the

high-side switch turns on, the voltage on the

bootstrap capacitor is boosted above the input

voltage and the internal bootstrap diode prevents

the capacitor from discharging.

Input UVLO

Both VCC and IN pins have input UVLO

detection. Until both VCC and IN voltage exceed

under voltage lockout threshold, the parts remain

in shutdown condition. There are also under

voltage lockout hysesteres at both VCC and IN

pins.