LTC3560

6

3560fb

PIN FUNCTIONS

RUN (Pin 1): Run Control Input. Forcing this pin above 1.5V

enables the part. Forcing this pin below 0.3V shuts down

the device. In shutdown, all functions are disabled drawing

<1μA supply current. Do not leave RUN floating.

GND (Pin 2): Ground Pin.

SW (Pin 3): Switch Node Connection to Inductor. This pin

connects to the drains of the internal main and synchronous

power MOSFET switches.

to GND, Pin 2, with a 10μF or greater ceramic capacitor.

from an external resistive divider across the output.

SYNC/MODE (Pin 6): External Clock Synchronization and

Mode Select Input. To synchronize with an external clock,

apply a clock with a frequency between 1MHz and 3MHz.

pin selects Burst Mode operation. Do not leave this pin

floating.

FUNCTIONAL DIAGRAM

+

–

+

–

EA

+

–

5

1

RUN

OSC

SLOPE

COMP

OSC

FREQ

SHIFT

0.6V

0.6V REF

SHUTDOWN

0.4V

0.65V

SLEEP

6

SYNC/MODE

EN

BURST

RS LATCH

SWITCHING

LOGIC

AND

BLANKING

CIRCUIT

ANTI-

SHOOT-

THRU

S

RQ

Q

5Ω

4

SW

3

GND

3560 BD

2

Load Step

Load Step

Load Step

200mV/DIV

AC COUPLED

1A/DIV

1A/DIV

20μs/DIV

3560 G22

Burst Mode OPERATION

200mV/DIV

AC COUPLED

1A/DIV

1A/DIV

20μs/DIV

3560 G23

Burst Mode OPERATION

200mV/DIV

AC COUPLED

1A/DIV

1A/DIV

20μs/DIV

3560 G24

Burst Mode OPERATION

TYPICAL PERFORMANCE CHARACTERISTICS

(From Figure 1a Except for the Resistive Divider Resistor Values)