LTC3547 datasheet(6/16 Pages) LINER

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LTC3547

3547fa

PI FU CTIO S

VFB1 (Pin 1): Regulator 1 Output Feedback. Receives

the feedback voltage from the external resistor divider

across the regulator 1 output. Nominal voltage for this

pin is 0.6V.

RUN1 (Pin 2): Regulator 1 Enable. Forcing this pin to

VIN enables regulator 1, while forcing it to GND causes

regulator 1 to shut down.

VIN (Pin 3): Main Power Supply. Must be closely decou-

pled to GND.

SW1 (Pin 4): Regulator 1 Switch Node Connection to the

Inductor. This pin swings from VIN to GND.

GND (Pin 5): Ground. Connect to the (–) terminal of COUT,

and the (–) terminal of CIN.

SW2 (Pin 6): Regulator 2 Switch Node Connection to

the Inductor. This pin swings from VIN to GND.

RUN2 (Pin 7): Regulator 2 Enable. Forcing this pin to

VIN enables regulator 2, while forcing it to GND causes

regulator 2 to shut down.

VFB2 (Pin 8): Regulator 2 Output Feedback. Receives

the feedback voltage from the external resistor divider

across the regulator 2 output. Nominal voltage for this

pin is 0.6V.

Exposed Pad (Pin 9): Electrically Connected to GND.

Must be soldered to the PCB for optimum thermal

performance.

–

VSLEEP

ITH

SWITCHING

LOGIC

AND

BLANKING

CIRCUIT

LATCH

BURST

ICOMP

IRCMP

ANTI

SHOOT-

THRU

SLOPE

COMP

SLEEP

0.6V REF

OSC

REGULATOR 2 (IDENTICAL TO REGULATOR 1)

SLEEP1

SLEEP2

SHUTDOWN

REGULATOR 1

SW1

SW2

Ω

3547 FD

RUN1

RUN2

VFB2

VFB1

VIN

GND

0.6V

BURST

CLAMP

SOFT-START

FUNCTIONAL DIAGRAM

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