LTC3543 datasheet(6/16 Pages) LINER

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LTC3543

3543f

PI FU CTIO S

SW (Pin 1): Switch Node Connector to Inductor. This pin

connects to the drains of the internal main and synchronous

power MOSFET switches.

CAP (Pin 2): Capacitor used for smoothing out spread

spectrum or for PLL response. Connect to a capacitor

whose other plate is connected to GND, or allow the pin

to ﬂoat. Value = 1nF – 10nF.

MODE (Pin 3): Mode Selection Pin. Connect as follows to

invoke desired operation: MODE = GND → Burst Mode,

MODE = VFB → Pulse skip with spread spectrum, MODE =

VIN → Pulse skip, MODE = External clock → PLL mode.

FU CTIO AL DIAGRA

VFB (Pin 4): Feedback sensing pin for the external feedback

resistors.

RUN (Pin 5): Run Control Input. Forcing pin above 1.5V

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

the device. In shutdown, all functions are disabled,

drawing <1µA of supply current. Do not leave the RUN

pin ﬂoating.

VIN (Pin 6): Main Supply Pin.

Exposed Pad (Pin 7): Exposed Pad connected to

ground.

LOGIC

VIN

VFB

MODE

RUN

MODE SELECT

COUT

CIN

SPREAD

SPECTRUM

PLL

BURST

MAIN

ICOMP

IRCMP

OSC

PEAK CURRENT LEVEL REF

SYNCHRONOUS

VIN

VOUT

CAP

0.6V

VOUT

3543 FD

GND

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