© 1999 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

DUAL LINEAR CONTROLLER

SC1538

PRELIMINARY - October 5, 1999

2

PIN DESCRIPTION

Pin

Pin Name

Pin Function

1

DRV1

Output of regulator #1. Drives the gate of an N-channel MOSFET to maintain 1.818V/

2.525V.

2

SNS1

Regulator #1 Sense input. Use as a remote sense to the source of the N-channel MOSFET

(Output 1).

3

EN1

Active high enable control with internal pullup. Output of regulator #1 turns off when EN1 is

taken low.

4

GND

Ground

5

EN2

Active high enable control with internal pullup. Output of regulator #2 turns off when EN2 is

taken low.

6

SNS2

Regulator #2 Sense input. Use as a remote sense to the source of the N-channel MOSFET

(Output 2).

7

DRV2

Output of regulator #2. Drives the gate of an N-channel MOSFET to maintain 1.515V/

2.525V.

8

VIN

+12V Supply.

APPLICATION CIRCUIT

1.818V / 2.525V OUT

1.818V / 2.525V ENABLE

3.3V IN

12V IN

1.515V / 2.525V OUT

1.818V / 2.525V ENABLE

Q1

PHB11N06LT

Q2

PHB11N06LT

U1

SC1538

1

2

3

4

5

6

7

8

DRV1

SNS1

EN1

GND

EN2

SNS2

DRV2

VIN

C1

100uF

C2

100uF

C3

100uF

C4

100uF

C5

100uF

C6

100uF

C7

0.1uF

R1

10k

R2

10k