PORTABLE PENTIUM II & III POWER SUPPLY CONTROLLER - Semtech Corporation
Description
PORTABLE PENTIUM II & III POWER SUPPLY CONTROLLER
January 28, 2000
®
SC1406A
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.
semtech.
com
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 comparator 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 25mV.
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 comparator 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 Complete power solution with two LDO drivers ® Programmable output voltage for Pentium II & III Processors
APPLICATIONS • • •
Laptop and Notebook computers 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
1
© 2000 SEMTECH CORP.
652 MITCHELL ROAD
NEWBURY PARK CA 91320
PORTABLE PENTIUM II & III POWER SUPPLY CONTROLLER
January 28, 2000
®
SC1406A
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 comparator h...
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