RT7297C

2

DS7297C-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 0.1

μF or greater ceramic

capacitor from BOOT to SW pins.

2

VIN

Power Input. The input voltage range is from 4.5V to 18V. Must bypass with a

suitable large ceramic capacitor.

3

SW

Switch Node. Connect this pin to an 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. It is used to regulate the output of the converter to a set value

via an external resistive voltage divider.

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. A logic high enables the converter; a logic low forces the

converter 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 13.5ms.

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.

Pin Configurations

(TOP VIEW)

SOP-8 (Exposed Pad)

BOOT

VIN

SW

GND

SS

EN

FB

COMP

GND

2

3

4

5

6

7

8

9

Package Type

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

RT7297C

Lead Plating System

Z : ECO (Ecological Element with

Halogen Free and Pb free)

H : UVP Hiccup

L : UVP Latch-Off