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LTC3418

3418f

PI FU CTIO S

VFB (Pin 25): Feedback Pin. Receives the feedback voltage

from a resistive divider connected across the output.

ITH (Pin 26): Error Amplifier Compensation Point. The

current comparator threshold increases with this control

voltage. Nominal voltage range for this pin is from 0.2V to

1.4V with 0.4V corresponding to the zero-sense voltage

(zero current).

SYNC/MODE (Pin 27): Mode Select and External Clock

Synchronization Input. To select Forced Continuous, tie to

SVIN. Connecting this pin to a voltage between 0V and 1V

selects Burst Mode operation with the burst clamp set to

the pin voltage.

TRACK (Pin 35): Voltage Tracking Input. Feedback voltage

will regulate to the voltage on this pin during start-up

power sequencing.

Exposed Pad (Pin 39): The Exposed Pad is PGND and

must be soldered to the PCB ground.

BLOCK DIAGRA

–

SLOPE

COMPENSATION

RECOVERY

OSCILLATOR

NMOS

CURRENT

COMPARATOR

CURRENT

REVERSE

COMPARATOR

SLOPE

COMPENSATION

LOGIC

ERROR

AMPLIFIER

BURST

COMPARATOR

PMOS CURRENT

COMPARATOR

PVIN

VOLTAGE

REFERENCE

TRACK

VFB

PGOOD

RUN/SS

RUN

0.74V

SYNC/MODE

0.86V

VREF

ITH

SYNC/MODE

BCLAMP

SGND

SVIN

PGND

3418 BD

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