LTC3543 datasheet(6/16 Pages) LINER

Part #	LTC3543

Description	600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3543

6

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

SW

VIN

VFB

MODE

RUN

S

R

Q

QB

MODE SELECT

R1

R2

COUT

CIN

SPREAD

SPECTRUM

PLL

BURST

C1

RS

BP

MAIN

ICOMP

IRCMP

OSC

PEAK CURRENT LEVEL REF

SYNCHRONOUS

VIN

VOUT

CAP

0.6V

VOUT

EA

L

5

3

2

4

1

7

6

3543 FD

GND

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