SC1538 Datasheet | SEMTECH

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 supply for the I/O plane and a 1.515V power supply for the GTL+ and AGP planes. The SC1538CS25/25 can provide two 2.525V supplies for clock and memory. SC1538 Features include Enable controls for each linear 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 - - - - - Dual power supplies 1.515V Supply for GTL+ and AGP planes/1.818V Supply for chipset I/O and memory termination Dual 2.525V supplies for clock and memory Individual Enable control of each supply Over current protection APPLICATIONS - - Motherboards Simple dual power supplies ORDERING INFORMATION Part Number (1) Output Voltages 1.515V and 1.818V 2.525V and 2.525V Package SO-8 SO-8 SC1538CS15/18 SC1538CS25/25 BLOCK DIAGRAM Note: (1) Add suffix ‘TR’ for tape and reel packaging. ABSOLUTE MAXIMUM RATINGS Parameter Input Supply Voltage Input Pins Operating Temperature Range Operating Junction Temperature Storage Temperature Range Lead Temperature (Soldering) 10 Sec Thermal Temperature Junction to Ambient TA TJ TSTG TLEAD θJA θJC ESD Symbol VIN Maximum -0.5 to +15 -0.5 to +7 0 to +70 0 to +125 -65 to +150 300 130 47 2 Units V V °C °C °C °C °C/W °C/W k V PIN CONFIGURATION Top View Thermal Impedance Junction to Case ESD Rating (SO-8) 1 © 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 DUAL LINEAR CONTROLLER PRELIMINARY - October 5, 1999 PIN DESCRIPTION Pin 1 2 3 4 5 6 7 8 Pin Name DRV1 SNS1 EN1 GND EN2 SNS2 DRV2 VIN Pin Function Output of regulator #1. Drives the gate of an N-channel MOSFET to maintain 1.818V/ 2.525V. Regulator #1 Sense input. Use as...