SC1406A Datasheet | SEMTECH

ESCRIPTION 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 hysteresis settling. Current limit setting pin. Voltage clamp output. Voltage clamp input. Voltage clamp bypass pin. Needs to have a 1500p F cap from this pin...