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LTC3564

3564f

VFB (Pin 1/Pin 4) : Feedback Pin. Receives the feedback

voltage from an external resistive divider across the out-

put.

GND (Pin 2/NA): Ground Pin.

VIN (Pin 3/Pin 3): Main Supply Pin. Must be closely

decoupled to GND, Pin 2, with a 10

μF or greater ceramic

capacitor.

SW (Pin 4/Pin 1): Switch Node Connection to Inductor.

This pin connects to the drains of the internal main and

synchronous power MOSFET switches.

RUN (Pin 5/Pin 6): Run Control Input. Forcing this pin

above 1.5V enables the part. Forcing this pin below 0.3V

shuts down the device. In shutdown, all functions are

disabled drawing <1

μA supply current. Do not leave RUN

floating.

PGND (NA/Pin 2): Main Power Ground Pin. Connect to the

(–) terminal of COUT, and (–) terminal of CIN.

SGND (NA/Pins 5, 7): The Signal Ground Pin. All small

signal components and compensation components should

be connected to this ground (see Board Layout Consider-

ations.)

PI FU CTIO S (S5/DCB)

FU CTIO AL DIAGRA

–

IRCMP

–

ICOMP

RUN

OSC

SLOPE

COMP

OSC

FREQ

SHIFT

0.6V

0.6V REF

SHUTDOWN

0.52V

0.65V

SLEEP

VIN

VFB

BURST

VIN

RS LATCH

SWITCHING

LOGIC

AND

BLANKING

CIRCUIT

ANTI-

SHOOT-

THRU

RSENSE

GND

3564 FD

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