MIC4609 datasheet(17/34 Pages) MICROCHIP

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 2016 Microchip Technology Inc.

DS20005531A-page 17

MIC4609

4.3

Enable Inputs

There is one external Enable pin that controls all three

phases. A logic high on the enable pin (EN) allows for

startup of all phases and normal operation. Conversely,

when a logic low is applied on the Enable pin, all

phases turn off and the device enters a low current

Shutdown mode. All outputs (xHO and xLO) are pulled

low when EN is low. The EN pin is internally pulled

down. Leaving the pin open disables the part.

TABLE 4-1:

OPERATIONAL TRUTH TABLE

ULVO (1, 2)

Outputs (3, 4)

Condition

xHI

xLI

HB ULVO

VDD ULVO

xHO

xLO

Disabled

VDD ULVO

VHB ULVO

L or H

Switching

Note 1:

UVLO = H when VDD > UVLO threshold

UVLO = L when VDD < UVLO threshold

xHO and xLO remain low if both xHI and xLI are low when the VDD rises above the UVLO threshold or

when the EN pin is asserted high. Normal switching operation begins when one of the inputs changes

state from L to H.

Anti-shoot-through circuit prevents a high on both outputs simultaneously.

MIC4609 Datasheet(PDF) 17 Page - Microchip Technology