SC1406A Datasheet | SEMTECH

PORTABLE PENTIUM II & III POWER SUPPLY CONTROLLER January 28, 2000 ® TEL:805-498-2111 FAX:805-498-3804 WEB:http://.semtech. DESCRIPTION The SC1406A is a High Speed, High performance Hysteretic Mode controller. It is part of a two chip solution, with the SC1405 Smart Driver, providing power to advanced micro-processors. It uses a Dynamic Set Point switching technique along with an ultra-fast parator to provide the control signal to an external high speed Mosfet driver. A 5-bit DAC sets the output voltage, thus providing a voltage resolution of 25m V. SC1406A has two on-chip linear regulators which drive external PNP transistors with output voltage settings of 1.5V and 2.5Vdc. The linear regulator drivers have a separate soft start. A PWRGD TTL level signal is asserted when all voltages are within specifications. The part Features Low Battery Detect and Undervoltage Lock-Out for the main Hysteretic controller to assure V-DC is within acceptable limits. An Over-Current parator disables the main controller during an overcurrent condition using an externally programmable threshold. Features - - - - High Speed Hysteretic controller provides high efficiency over a wide operating load range Inherently stable plete power solution with two LDO drivers ® Programmable output voltage for Pentium II & III Processors APPLICATIONS - - - Laptop and Notebook puters High performance Microprocessor based systems High efficiency distributed power supplies ORDERING INFORMATION DEVICE SC1406ACTS PACKAGE TSSOP-28 TEMP. (T J) 0 - 125°C BLOCK DIAGRAM PIN CONFIGURATION Top View TSSOP-28 Pentium is a registered trademark of Intel Corporation © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 PORTABLE PENTIUM II & III POWER SUPPLY CONTROLLER January 28, 2000 ® PIN DESCRIPTION Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Pin Name Pin Function HYS CLSET VCOUT VCIN VCBYP VID4 VID3 VID2 VID1 VID0 BASE25 FB25 BASE15 FB15 EN Core parator...