LTC3549 datasheet(7/16 Pages) LINER

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LTC3549

3549f

PI FU CTIO S

VIN (Pin 1): Main Supply Pin. Must be closely decoupled

to GND, Pins 2 and 7, with a 4.7µF or greater ceramic

capacitor.

GND (Pin 2): N/C. Ground this pin.

SW (Pin 3): Switch Node Connection to Inductor. This pin

connects to the drains of the internal main and synchronous

power MOSFET switches.

MODE (Pin 4): Mode Select Input. To select pulse-skip-

ping mode, force this pin above 1.1V. Forcing this pin

below 0.3V selects Burst Mode operation. Do not leave

MODE ﬂoating.

RUN (Pin 5): Run Control Input. Forcing this pin above 1.1V

enables the part. Forcing this pin below 0.3V shuts down

the device. In shutdown, all functions are disabled drawing

<1µA supply current. Do not leave RUN ﬂoating.

VFB (Pin 6): Feedback Pin. Receives the feedback voltage

from an external resistive divider across the output.

GND (Pin 7): Exposed Pad. The Exposed Pad is ground. It

must be soldered to PCB ground to provide both electrical

contact and optimum thermal performance.

FU CTIO AL DIAGRA

–

OVDET

IRCMP

–

ICOMP

RUN

SLOPE

COMP

OSC

0.611V

REFERENCE

SHUTDOWN

0.671

0.4V

0.65V

SLEEP

VIN

VFB

MODE

BURST

VIN

RS LATCH

SWITCHING

LOGIC

AND

BLANKING

CIRCUIT

ANTI-

SHOOT-

THRU

SOFT-

START

Ω

GND

3549 FD

GND

OSCILLATOR

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