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LTC3563

500mA, Synchronous Step-Down DC/DC Converter with Selectable Output Voltage

Linear Technology 

LTC3563

PI FU CTIO S

VOUT (Pin 1): Output Voltage Feedback. An internal resistive

divider divides the output voltage down for comparison

to the internal 0.6V reference voltage.

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

to GND.

GND (Pin 3): Ground Pin.

SW (Pin 4): Switch Node Connection to Inductor. This pin

connects to the drains of the internal main and synchronous

power MOSFET switches.

VSEL (Pin 5): Output Voltage Selection Pin. This pin controls

the regulated output voltage. When tied to GND, VOUT is

1.28V. When floating or connecting this pin to VIN, VOUT

becomes 1.87V.

RUN (Pin 6): 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.

Exposed Pad (Pin 7): GND. The Exposed Pad is ground. It

must be soldered to PCB ground to provide both electrical

contact and optimum thermal performance.

3563f

6

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