LTC3542I 데이터 시트보기 (PDF) - Linear Technology

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LTC3542I

500mA, 2.25MHz Synchronous Step-Down DC/DC Converter

Linear Technology 

LTC3542

PIN FUNCTIONS (DFN/TSOT-23)

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.

BLOCK DIAGRAM

VFB

0.6V

–

EA

+

MODE/SYNC

VIN

SLOPE COMPENSATION

OSC

–

+

VB

+

BURST

LOGIC

MODE

DETECT

MODE

CLKIN

RUN

SHUTDOWN

0.6V REF

ICOMP

ANTI-

SHOOT

THROUGH

IRCMP

VIN

SW

GND

3542 BD

3542fa

6

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