SC1540

SC1540A

© 2000 SEMTECH CORP.

300mA AND 500mA LOW DROPOUT

VOLTAGE REGULATORS WITH ENABLE

PRELIMINARY - May 1, 2000

652 MITCHELL ROAD NEWBURY PARK CA 91320

3

TYPICAL APPLICATION

VOUT

VIN

ENABLE SIGNAL

U1

SC1540(A)

VIN

EN

GND

VO

C2

10uF min.

C1

10uF

Tantalum

Tantalum

NOTES

(1) Input and output capacitors should be located close to the device.

(2) Connect all pins to PCB for optimal thermal characteristics.

(3) Increasing the output capacitor value will improve the overall transient response.

(4) The device is enabled when EN = VIN, and shut down when EN is pulled to ground. EN should not be taken

higher than VIN. A CMOS signal referenced to VIN would be ideal for switching the SC1540(A) on and off.