SC1406

PORTABLE PENTIUM II & III POWER SUPPLY CONTROLLER PRELIMINARY - August 27, 1999 ® SC1406 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The SC1406 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. SC1406 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 ...