© 1999 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

DUAL LINEAR CONTROLLER

SC1538

PRELIMINARY - October 5, 1999

1

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

DESCRIPTION

The SC1538 is a dual power supply controller designed

to simplify power management on motherboards. It is

part of Semtech’s Smart LDO™ family of products.

The SC1538CS15/18 can provide a 1.818V power sup-

ply for the I/O plane and a 1.515V power supply for the

GTL+ and AGP planes. The SC1538CS25/25 can pro-

vide two 2.525V supplies for clock and memory.

SC1538 features include Enable controls for each lin-

ear FET controller and over current protection. Over

current protection is provided by feedback to the sense

pins. If any output drops below 1V (typical) for greater

than 4ms (typical), that output will shut down.

The SC1538 is available in a SO-8 surface mount

package.

FEATURES

Supply for chipset I/O and memory termination

APPLICATIONS

ABSOLUTE MAXIMUM RATINGS

Parameter

Symbol

Maximum

Units

Input Supply Voltage

VIN

-0.5 to +15

V

Input Pins

-0.5 to +7

V

Operating Temperature

Range

T

A

0 to +70

°C

Operating Junction

Temperature

T

J

0 to +125

°C

Storage Temperature

Range

T

STG

-65 to +150

°C

Lead Temperature

(Soldering) 10 Sec

T

LEAD

300

°C

Thermal Temperature

Junction to Ambient

θ

JA

130

°C/W

Thermal Impedance

Junction to Case

θ

JC

47

°C/W

ESD Rating

ESD

2

kV

ORDERING INFORMATION

Part Number

(1)

Output Voltages

Package

SC1538CS15/18

1.515V and 1.818V

SO-8

SC1538CS25/25

2.525V and 2.525V

SO-8

Note:

(1) Add suffix ‘TR’ for tape and reel packaging.

BLOCK DIAGRAM

PIN CONFIGURATION

(SO-8)

Top View