LTC3561A datasheet(7/20 Pages) LINER

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LTC3561A

3561af

SHDN/RT (Pin 1): Combination Shutdown and Timing

Resistor Pin. The oscillator frequency is programmed by

connecting a resistor from this pin to ground. Forcing

this pin to SVIN causes the device to be shut down. In

shutdown all functions are disabled.

SGND (Pin 2): Signal Ground. All SGND and PGND pins

must be connected together through a thick copper trace

or ground plane.

SW (Pin 3): The Switch Node Connection to the Inductor.

This pin swings from PVIN to PGND.

PGND (Pin 4): Power Ground. Connect to the (–) terminal

of COUT, and (–) terminal of CIN. All SGND and PGND pins

must be connected together through a thick copper trace

or ground plane.

PVIN (Pin 5): Main Supply Pin. Must be closely decoupled

to PGND.

PIN FUNCTIONS

SVIN (Pin 6): The Signal Power Pin. All active circuitry

is powered from this pin. Must be closely decoupled to

SGND. SVIN must be greater than or equal to PVIN.

VFB (Pin 7): Receives the feedback voltage from the ex-

ternal resistive divider across the output. Nominal voltage

for this pin is 0.8V.

ITH(Pin8):ErrorAmpliﬁerCompensationPoint.Thecurrent

comparator threshold increases with this control voltage.

Nominal voltage range for this pin is 0.4V to 1.4V.

Exposed Pad (Pin 9): Signal Ground. All small-signal

components and compensation components should be

connected to this ground (see Board Layout Consider-

ations). Must be soldered to electrical ground on PCB.

All SGND and PGND pins must be connected together

through a thick copper trace or ground plane.

NOMINAL (V)

ABSOLUTE MAX (V)

NAME

DESCRIPTION

MIN

TYP

MAX

MIN

MAX

SHDN/RT

Shutdown/Timing Resistor

–0.3

0.8

SVIN

–0.3

SVIN + 0.3

SGND

Signal Ground

Switch Node

PVIN

–0.3

PVIN + 0.3

PGND

Main Power Ground

5PVIN

Main Power Supply

–0.3

5.5

–0.3

SVIN + 0.3

6SVIN

Signal Power Supply

2.5

5.5

–0.3

7VFB

Output Feedback Pin

0.8

1.0

–0.3

SVIN + 0.3

8ITH

Error Ampliﬁer Compensation and Run Pin

0.4

1.4

–0.3

SVIN + 0.3

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