RT7248

2

DS7248-01

September 2012

www.richtek.com

©

Copyright

2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

BOOT

Bootstrap for High Side Gate Driver. Connect a 100nF or greater ceramic

capacitor from BOOT to SW pins.

2

VIN

Input Supply Voltage, 4.5V to 18V. Must bypass with a suitable large

ceramic capacitor.

3

SW

Phase Node. Connect this pin to external L-C filter.

4, 9 (Exposed Pad)

GND

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

to GND for maximum power dissipation.

5

FB

Feedback Input Pin. This pin is connected to the converter output. It is used

to set the output of the converter to regulate to the desired value via an

external resistive voltage divider. For an adjustable output, an external

resistive voltage divider is connected to this pin.

6

COMP

Compensation Node. COMP is used to compensate the regulation control

loop. Connect a series RC network from COMP to GND. In some cases, an

additional capacitor from COMP to GND is required.

7

EN

Enable Input pin. A logic high enables the converter; a logic low forces the

IC into shutdown mode reducing the supply current to less than 3

μA. Attach

this pin to VIN with a 100k

Ω pull up resistor for automatic startup.

8

SS

Soft-Start Control Input. SS controls the soft-start period. Connect a

capacitor from SS to GND to set the soft-start period. A 0.1

μF capacitor

sets the soft-start period to 15.5ms.

Ordering Information

Note :

Richtek products are :

RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

Suitable for use in SnPb or Pb-free soldering processes.

Package Type

SP : SOP-8 (Exposed Pad-Option 2)

RT7248

Lead Plating System

G : Green (Halogen Free and Pb Free)

H : UVP Hiccup

N : UVP Disabled

Pin Configurations

(TOP VIEW)

BOOT

VIN

SW

GND

SS

EN

FB

COMP

GND

2

3

4

5

6

7

8

9

SOP-8 (Exposed Pad)