LTC3415 Datasheet, PDF(17/28 Page) Linear Technology – 7A, PolyPhase Synchronous Step-Down Regulator

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

LTC3415 Datasheet, PDF (17/28 Pages) Linear Technology – 7A, PolyPhase Synchronous Step-Down Regulator

◁

LTC3415

OPERATION

During ramp down of the output, if the TRACK pin is not

tied to VIN, then the LTC3415 will maintain normal opera-

tion even though the RUN pin is programmed low. Only

when the TRACK pin is below 0.18V will the RUN signal

be gated through internally and shut down the part. This

way, coincident tracking and ratiometric sequencing of the

two outputs are accomplished during both start-up and

shutdown. An output current load, however, needs to be

present during this time in order to discharge the output

because when TRACK is below 0.57V, forced continuous

operation is not allowed and inductor current, therefore,

is prevented from going negative.

For applications that do not require tracking or sequenc-

ing, simply tie the TRACK pin to SVIN to let RUN control

the turn on/off of the LTC3415. Connecting TRACK to

SVIN also enables the ~100Î¼s of internal soft-start during

start-up.

3415fa

▷