LTC3542 datasheet(6/16 Pages) LINER

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LTC3542

3542fa

–

0.6V

VFB

VIN

MODE/SYNC

RUN

VIN

SHUTDOWN

BURST

MODE

CLKIN

ICOMP

SLOPE COMPENSATION

ANTI-

SHOOT

THROUGH

MODE

DETECT

0.6V REF

OSC

GND

3542 BD

IRCMP

LOGIC

VFB (Pin 1/Pin 3): Output Feedback Pin. Receives the

feedback voltage from an external resistive divider across

the output. Nominal voltage for this pin is 0.6V.

VIN (Pin 2/Pin 1): Power Supply Pin. Must be closely

decoupled to GND.

GND (Pin 3/Pin 2): Ground Pin.

SW (Pin 4/Pin 6): Switch Node Connection to Inductor.

This pin connects to the drains of the internal main and

synchronous power MOSFET switches.

MODE/SYNC (Pin 5/Pin 5): Mode Selection and Oscillator

Synchronization Pin. This pin controls the operation of the

device. When tied to GND or VIN, Burst Mode operation or

pulse skipping mode is selected, respectively. Do not ﬂoat

this pin. The oscillation frequency can be synchronized to

an external oscillator applied to this pin and pulse skipping

mode is automatically selected.

RUN (Pin 6/Pin 4): 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, all functions

are disabled drawing <1μA supply current. This pin must

be driven; do not ﬂoat.

GND (Pin 7, DFN Package Only): Exposed Pad. The Ex-

posed Pad is ground. It must be soldered to PCB ground

to provide both electrical contact and optimum thermal

performance.

PIN FUNCTIONS (DFN/TSOT-23)

BLOCK DIAGRAM

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