LTC3545 datasheet(7/20 Pages) LINER

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LTC3545/LTC3545-1

35451fb

PIN FUNCTIONS

SW1 (Pin 1): Switch Node Connection to Inductor for

Regulator 1. This pin connects to the internal power

MOSFET switches.

PGOOD1 (Pin 2): This open-drain output voltage is pulled

to a logic low when VFB1 is below 0.54V (VOUT1 is below

90% of regulated level).

RUN2 (Pin 3): Regulator 2 Enable Pin. Apply a voltage

greater than VRUN(HIGH) to enable this regulator.

PGOOD2 (Pin 4): This open-drain output voltage is pulled

to a logic low when VFB2 is below 0.54V (VOUT2 is below

90% of regulated level).

SW2 (Pin 5): Switch Node Connection to Inductor for

Regulator 2. This pin connects to the internal power

MOSFET switches.

PGND (Pin 6): Regulators 2 and 3 Power Path Return.

PVIN (Pin 7): Power Path Supply Pin for Regulators 2 and

3. This pin must be closely decoupled to PGND, with a

4.7μF or greater ceramic capacitor.

SW3 (Pin 8): Switch Node Connection to Inductor for

Regulator 3. This pin connects to the internal power

MOSFET switches.

SYNC/MODE (Pin 9, LTC3545 Only): Mode Select and

External Clock Input. When pulled low, part operates in

Burst Mode operation. When pulled high, part operates

in pulse skipping mode. When driven by a 1MHz to 3MHz

external clock, the part operates in pulse skipping mode

with a switching frequency equal to the external clock.

PGOOD3 (Pin 9, LTC3545-1 Only): This open-drain output

voltage is pulled to a logic low when VFB3 is below 0.54V

(VOUT3 is below 90% of regulated level). The LTC3545-1

operates in Burst Mode operation only.

RUN3 (Pin 10): Regulator 3 Enable Pin. Apply a voltage

greater than VRUN(HIGH) to enable this regulator.

VFB3 (Pin 11): Regulator 3 Feedback Pin. This pin receives

the feedback voltage from an external resistive divider

across the output.

VFB2 (Pin 12): Regulator 2 Feedback Pin. This pin receives

the feedback voltage from an external resistive divider

across the output.

VFB1 (Pin 13): Regulator 1 Feedback Pin. This pin receives

the feedback voltage from an external resistive divider

across the output.

RUN1 (Pin 14): Regulator 1 Enable Pin. Apply a voltage

greater than VRUN(HIGH) to enable this regulator.

VIN (Pin 15): Supply Pin for Internal Reference and Control

Circuitry. Power path supply for regulator 1.

GNDA (Pin 16): Ground Pin for Internal Reference and

Control Circuitry. Power path return for regulator 1.

Exposed Pad (Pin 17): GND. Must be soldered to the

PCB.

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