2

RT4503/A

www.richtek.com

DS4503/A-03

June 2015

©

Copyright

2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

FB

Feedback Voltage Input. Place a resistor between this pin and GND to set

the current.

COMP (RT4503)

Connect an External Capacitor to this Pin.

2

NC (RT4503A)

No Internal Connection.

3,

7 (Exposed Pad)

GND

Ground. The exposed pad must be soldered to a large PCB and connected

to GND for maximum thermal dissipation.

4

LX

Switch Node. Connect the pin to the switch side of the inductor.

5

EN

Enable Control Input and Pulse Dimming Input.

6

VIN

Supply Voltage Input.

WDFN-6L 2x2

(TOP VIEW)

FB

NC

VIN

EN

LX

GND

5

4

1

2

3

6

7

Pin Configurations

RT4503

WDFN-6L 2x2

RT4503A

FB

COMP

VIN

EN

LX

GND

5

4

1

2

3

6

7

Marking Information

1TW

1T : Product Code

W : Date Code

RT4503GQW

2R : Product Code

W : Date Code

RT4503AGQW

2RW