RT7281 datasheet(3/22 Pages) RICHTEK

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RT7274/79/80/81

DS7274/79/80/81-01 February 2013

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Pin No.

TSSOP-14

(Exposed Pad)

SOP-8

(Exposed Pad)

Pin Name

Pin Function

VOUT

Output Voltage Sense Input. This terminal is used for On-Time

Adjustment.

Feedback Input Voltage. Connect with feedback resistive

divider to the output voltage.

PVCC

5.1V Power Supply Output. Connect a 1

μF capacitor from this

pin to GND.

Soft-Start Control. Connect an external capacitor between this

pin and GND to set the soft- start time.

9 (Exposed Pad)

GND

Analog Ground. The exposed pad must be soldered to a large

PCB and connected to GND for maximum power dissipation.

PGOOD

Open Drain Power Good Output.

Enable Control Input.

8, 9, 15

(Exposed pad)

PGND

Power Ground. The exposed pad must be soldered to a large

PCB and connected to PGND for maximum power dissipation.

10, 11

Switch Node.

BOOT

Bootstrap Supply for High Side Gate Driver. Connect a 0.1

μF

capacitor between the BOOT and SW pin.

VIN

Power Input. It is connected to the drain of the internal high

side MOSFET.

VINR

Supply Input for Internal Linear Regulator to the Control

Circuitry.

Functional Pin Description

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