LX1665CDW

LX1665CDW Datasheet

LX1664/64A, LX1665/65A

Part	Datasheet
LX1665CDW	LX1665CDW (pdf)

Related Parts	Information
LX1664CD	LX1664CD
LX1665CN	LX1665CN
LX1664CN	LX1664CN
LX1664ACD	LX1664ACD
LX1664ACN	LX1664ACN
LX1665ACDW	LX1665ACDW
LX1665ACN	LX1665ACN

PDF Datasheet Preview
LX1664/64A, LX1665/65A DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC PRODUCTION DATA SHEET 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 Pro and Pentium II processors . The 5-bit code adjusts the output voltage between and 2.05V in 50mV increments and between 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 IMPORTANT For the most current data, consult LinFinity's web site: KEY FEATURES I 5-bit Programmable Output For CPU Core Supply I Adjustable Linear Regulator Driver Output I No Sense Resistor Required For Short- Circuit Current Limiting I Designed To Drive Either Synchronous Or Non-Synchronous Output Stages I Soft-Start Capability I Modulated, Constant Off-Time Architecture For Fast Transient Response And Simple System Design I Available Over-Voltage Protection OVP Crowbar Driver And Power Good Flag LX1665 only A P L I C AT I O N S I Socket 7 Pentium Class Microprocessor Supplies including Intel Pentium Processor, AMD-K6TM And 6x86TM, Gx86TM and M2TM Processors I Pentium II and Deschutes Processor & L2Cache Supplies I Voltage Regulator Modules PRODUCT HIGHLIGHT LX1665 IN A PENTIUM II SINGLE-CHIP POWER SUPPLY SOLUTION C3 0.1µF VID0 VID1 VID2 VID3 VID4 LX1665 1 SS 2 INV V 3 CC_CORE 4 VID0 5 VID1 6 VID2 7 VID3 8 VID4 9 LFB VC1 18 TDRV 17 GND 16 BDRV 15 VCC 14 CT 13 OV 12 LDRV 11 PWRGD 10 18-pin Wide-Body SOIC F1 20A 5V 1µH C5 1µF IRL3102 IRL3303 6.3V 1500µF x3 2.5µH Supply Voltage for CPU Core VOUT 6.3V, 1500µF x 3** C8 680pF Q4 IRLZ44 C9 330µF

PDF Datasheet Preview

LX1664/64A, LX1665/65A

DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC PRODUCTION DATA SHEET

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 Pro and Pentium II processors . The 5-bit code adjusts the output voltage between and 2.05V in 50mV increments and between 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

IMPORTANT For the most current data, consult LinFinity's web site:

KEY FEATURES

I 5-bit Programmable Output For CPU Core Supply

I Adjustable Linear Regulator Driver Output I No Sense Resistor Required For Short-

Circuit Current Limiting I Designed To Drive Either Synchronous Or

Non-Synchronous Output Stages I Soft-Start Capability I Modulated, Constant Off-Time Architecture

For Fast Transient Response And Simple System Design I Available Over-Voltage Protection OVP Crowbar Driver And Power Good Flag LX1665 only

A P L I C AT I O N S

I Socket 7 Pentium Class Microprocessor Supplies including Intel Pentium Processor, AMD-K6TM And 6x86TM, Gx86TM and M2TM Processors

I Pentium II and Deschutes Processor & L2Cache Supplies

I Voltage Regulator Modules

PRODUCT HIGHLIGHT LX1665 IN A PENTIUM II SINGLE-CHIP POWER SUPPLY SOLUTION

C3 0.1µF

VID0 VID1 VID2 VID3 VID4

LX1665
1 SS 2 INV V 3

CC_CORE
4 VID0 5 VID1 6 VID2 7 VID3 8 VID4 9 LFB

VC1 18 TDRV 17 GND 16 BDRV 15

VCC 14 CT 13 OV 12 LDRV 11 PWRGD 10
18-pin Wide-Body SOIC

F1 20A 5V
1µH C5 1µF

IRL3102

IRL3303
6.3V 1500µF x3
2.5µH

Supply Voltage for CPU Core

VOUT
6.3V, 1500µF x 3**

C8 680pF

Q4 IRLZ44

C9 330µF

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Datasheet ID: LX1665CDW 648552