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 2007 Semtech Corp.

www.semtech.com

POWER MANAGEMENT

SC4503

8-LEAD 2X2mm MLPD-W

Top Mark

Package

SC4503WLTRT

E00

2mmX2mm

MLPD-W

SC4503_MLPD EVB

Evaluation Board

Notes:

(1) Available in tape and reel only. A reel contains 3,000 devices.

(2) Available in lead-free package only. Device is WEEE and

RoHS compliant.

Ordering Information

Pin Descriptions - 2X2mm MLPD-W

Pin

Pin Name

Pin Functions

1,2

SW

Collector of the internal power transistor. Connect to the boost inductor and the free-

wheeling diode. The maximum switching voltage spike at this pin should be limited to

34V.

3

IN

Power Supply Pin. Bypassed with capacitor close to the pin.

4

SHDN/SS

Shutdown and Soft-start Pin. Pulling this pin below 0.4 shuts down the converter. Apply-

ing more than 2V at this pin enables the SC4503. An external resistor and an external

capacitor connected to this pin soft-start the switching regulator. The SC4503 will try

to pull the SHDN/SS pin below its 1.4V switching threshold regardless of the external

circuit attached to the pin if VIN is below the under-voltage lockout threshold. Tie this pin

through an optional resistor to IN or to the output of a controlling logic gate if soft-start is

not used. See Applications Information for more details.

5FB

The inverting input of the error amplifier. Tie to an external resistive divider to set the

output voltage.

6,7

GND

Ground. Tie to ground plane.

8

N.C.

No Connection.

EDP

Solder to the ground plane of the PCB.

Top View

Pin Configuration - 2mm X 2mm MLPD

1

2

3

4

8

7

6

5

SW

SW

IN

SHDN/SS

NC

GND

GND

FB

1

2

3

4

8

7

6

5

SW

SW

IN

SHDN/SS

NC

GND

GND

FB