 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

EN

HB ULVO

xHO

xLO

Disabled

X

X

L

X

X

L

L

X

X

X

X

L

L

L

X

L or H

H

L

H

L

L or H

Switching

HH

H

H

L

L

HH

H

L

L

LH

H

H

H

L

H

H

L

HH

HH

L

LL

H

H

H

L

L

Note 1:

2:

3:

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

state from L to H.

4:

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