LTC3565 datasheet(7/22 Pages) LINER

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LTC3565

3565fb

RT (Pin 1): Timing Resistor Pin. The oscillator frequency

is programmed by connecting a resistor from this pin to

ground.

RUN (Pin 2): Converter Enable Pin. Forcing this pin above

1.5V enables this part, while forcing it below 0.3V causes

the device to shut down. In shutdown, the device draws

<1μA supply current. This pin must be driven; do not ﬂoat.

SYNC/MODE (Pin 3): Combination Mode Selection and

Oscillator Synchronization Pin. This pin controls the

operation of the device. When tied to SVIN or GND, Burst

Mode operation or pulse skipping mode is selected,

respectively. If this pin is held at half of SVIN, the forced

continuous mode is selected. The oscillation frequency

can be synchronized to an external oscillator applied to

this pin. When synchronized to an external clock, pulse

skip mode is selected.

SW (Pin 4): The Switch Node Connection to the Inductor.

This pin swings from PVIN to GND.

PIN FUNCTIONS

GND (Pin 5, Exposed Pad Pin 11): Main Power Ground

Pin. Connect to the (–) terminal of COUT, and (–) terminal

of CIN. The exposed pad must be soldered to electrical

ground on the PCB.

PVIN (Pin 6): Main Supply Pin. Must be closely decoupled

to GND.

SVIN (Pin 7): The Signal Power Pin. All active circuitry is

powered from this pin. Must be closely decoupled to GND.

SVIN must be greater than or equal to PVIN.

PGOOD (Pin 8): The Power Good Pin. This common drain

logic output is pulled to GND when the output voltage is

not within ±7% of regulation.

VFB (Pin 9): Receives the feedback voltage from the ex-

ternal resistive divider across the output. Nominal voltage

for this pin is 0.6V.

ITH (Pin 10): Error Ampliﬁer Compensation Point. The

current comparator threshold increases with this control

voltage. Nominal voltage range for this pin is 0.4V to

1.4V.

NOMINAL (V)

ABSOLUTE MAX (V)

NAME

DESCRIPTION

MIN

TYP

MAX

MIN

MAX

Timing Resistor

–0.3

0.4

SVIN

–0.3

SVIN + 0.3

RUN

Enable Pin

–0.3

SVIN

–0.3

SVIN

SYNC/MODE

Mode Select/Synchronization Pin

SVIN

–0.3

SVIN + 0.3

Switch Node

PVIN

–0.3

PVIN + 0.3

GND

Main Power Ground

6PVIN

Main Power Supply

–0.3

5.5

–0.3

7SVIN

Signal Power Supply

2.5

5.5

–0.3

PGOOD

Power Good Pin

SVIN

–0.3

SVIN + 0.3

9VFB

Output Feedback Pin

0.8

1.0

–0.3

SVIN + 0.3

ITH

Error Ampliﬁer Compensation

1.5

–0.3

SVIN + 0.3

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