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LX1664

Part Number	LX1664
Manufacturer	Microsemi Corporation
Description	DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
Published	Mar 30, 2005
Detailed Description	LX1664/64A, LX1665/65A D UAL O UTPUT PWM C ONTROLLERS T H E WITH 5-B IT DAC I N F I N I T E P O W E R O F I N N...
Datasheet	LX1664 PDF File

Overview

LX1664/64A, LX1665/65A D UAL O UTPUT PWM C ONTROLLERS T H E WITH 5-B IT DAC I N F I N I T E P O W E R O F I N N O VA T I O N P R O D U C T I O N D A T A S H E E T DESCRIPTION The LX1664/64A and LX1665/65A are monolithic switching regulator controller IC’s designed to provide a low cost, high performance adjustable power supply for advanced microprocessors and other applications requiring a very fast transient response and a high degree of accuracy.
Short-circuit Current Limiting without Expensive Current Sense Resistors.
Current-sensing mechanism can use PCB trace resistance or the parasitic resistance of the main inductor.
The LX1664A and LX1665A have reduced current sense comparator threshold for optimum performance using a sense resistor.
For applications requiring a high degree of accuracy, a conventional sense resistor can be used to sense current.
Programmable Synchronous Rectifier Driver for CPU Core.
The main output is adjustable from 1.
3V to 3.
5V using a 5-bit code.
The IC can read a VID signal set by a DIP switch on the motherboard, or hardwired into the processor’s package (as in the case of Pentium® Pro and Pentium II processors).
The 5-bit code adjusts the output voltage between 1.
30 and 2.
05V in 50mV increments and between 2.
0 and 3.
5V in 100mV increments, conforming to the Intel Corporation specification.
The device can drive dual MOSFET’s resulting in typical efficiencies of 85 - 90% even with loads in excess of 10 amperes.
For cost sensitive applications, the bottom MOSFET can be replaced with a Schottky diode (non-synchronous operation).
Linear Regulator Driver.
The LX1664/ 65 family of devices have a secondary regulator output.
This can drive a MOSFET or bipolar transistor as a pass element to construct a low-cost adjustable linear regulator suitable for powering a 1.
5V GTL+ bus or 2.
5V clock supply.
(continued next page) K E Y F E AT U R E S I 5-bit Programmable Output For CPU Core Supply I Adjustable Linear Regulator Driver Outp...

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