6

© 2003 Semtech Corp.

www.semtech.com

POWER MANAGEMENT

SC1211

Pin Configuration

Ordering Information

Note:

(1) Only available in tape and reel packaging. A reel

contains 2500 devices.

Package

Temp Range (T

SC1211STR

EDP SO-8

0° to 125°C

Pin Descriptions

Pin #

Pin Name

Pin Function

1

DRN

The power phase node (or switching node) of the synchronous buck converter. This pin can be

subjected to a negative spike up to -V

2

TG

Output gate drive for the switching (top) MOSFET.

3

BST

Bootstrap pin. A capacitor is connected between BST and DRN pins to develop the floating

bootstrap voltage for the high-side MOSFET. The capacitor value is typically 1µF (ceramic).

4

CO

Logic level PWM input signal to the SC1211 supplied by external controller. An internal 50kohm

resistor is connected from this pin to PGND.

5

VPN

Virtual Phase Node. Connect an RC between this pin and the output sense point to Enable

6

VIN

converter.

7

VREG

LDO output.

Decouple with 1µF to 4.7µF (ceramic) with lead length no more than 0.2" (5mm).

8

BG

Output gate drive for the synchronous (bottom) MOSFET.

PAD

PGND

Ground. Keep this pin close to the synchronous MOSFETs source.

Top View

(Power SOIC-8)

TG

VIN

BST

5

6

7

8

VREG

VPN

DRN

CO

BG

1

2

3

4

EXPOSED PAD MUST BE SOLDERED

TO POWER GROUND PLANE