LTC3545 LINER [Linear Technology], LTC3545 Datasheet - Page 7

• Manufacturer Part Number: LTC3545
• Description: Triple 800mA Synchronous Step-Down Regulator-2.25MHz
• Manufacturer: LINER [Linear Technology]

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 V
90% of regulated level).
RUN2 (Pin 3): Regulator 2 Enable Pin. Apply a voltage
greater than V
PGOOD2 (Pin 4): This open-drain output voltage is pulled
to a logic low when V
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.
PV
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
IN
(Pin 7): Power Path Supply Pin for Regulators 2 and
RUN(HIGH)
FB1
FB2
to enable this regulator.
is below 0.54V (V
is below 0.54V (V
OUT1
OUT2
is below
is below
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 V
(V
operates in Burst Mode operation only.
RUN3 (Pin 10): Regulator 3 Enable Pin. Apply a voltage
greater than V
V
the feedback voltage from an external resistive divider
across the output.
V
the feedback voltage from an external resistive divider
across the output.
V
the feedback voltage from an external resistive divider
across the output.
RUN1 (Pin 14): Regulator 1 Enable Pin. Apply a voltage
greater than V
V
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.
FB3
FB2
FB1
IN
OUT3
(Pin 15): Supply Pin for Internal Reference and Control
(Pin 11): Regulator 3 Feedback Pin. This pin receives
(Pin 12): Regulator 2 Feedback Pin. This pin receives
(Pin 13): Regulator 1 Feedback Pin. This pin receives
is below 90% of regulated level). The LTC3545-1
RUN(HIGH)
RUN(HIGH)
LTC3545/LTC3545-1
to enable this regulator.
to enable this regulator.
FB3
is below 0.54V
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