LX1662CN

LX1662CN Datasheet

LX1662 / 62A, LX1663 /63A

Part	Datasheet
LX1662CN	LX1662CN (pdf)

Related Parts	Information
LX1663CD	LX1663CD
LX1662ACD	LX1662ACD
LX1662ACN	LX1662ACN
LX1663ACD	LX1663ACD
LX1663ACN	LX1663ACN
LX1663CN	LX1663CN
LX1662CD	LX1662CD

PDF Datasheet Preview
THE INFINITE POWER OF INNOVATION Not Recommended For New Design LX1662 / 62A, LX1663 /63A SINGLE-CHIP PROGRAMMABLE PWM CONTROLLERS WITH 5-BIT DAC PRODUCTION DATA SHEET The LX1662/62A and LX1663/63A 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. Currentsensing mechanism can use PCB trace resistance or the parasitic resistance of the main inductor. The LX1662A and LX1663A have reduced current sense comparator threshold for optimum performance using a PCB trace. 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 . Smallest Package Size. The LX1662 is available in a narrow body 14-pin surface mount IC package for space sensitive applications. The LX1663 provides the additional functions of Over Voltage Protection OVP and Power Good PWRGD output drives for applications requiring output voltage monitoring and protection functions. Ultra-Fast Transient Response Reduces System Cost. The modulated offtime architecture results in the fastest transient response for a given inductor, reducing output capacitor requirements, and reducing the total regulator system cost. Over-Voltage Protection and Power Good Flag. The OVP output in the LX1663 & LX1663A can be used to drive an SCR crowbar circuit to protect the load in the event of a shortcircuit of the main MOSFET. The LX1663 & LX1663A also have a logiclevel Power Good Flag to signal when the output voltage is out of specified limits. IMPORTANT For the most current data, consult MICROSEMI’s website: KEY FEATURES - 5-bit Programmable Output For CPU Core Supply - No Sense Resistor Required For Short-Circuit Current Limiting - Designed To Drive Either Synchronous Or NonSynchronous Output Stages - Lowest System Cost Possible For Price- Sensitive Pentium And Pentium II Class Applications - Soft-Start Capability - Modulated, Constant Off-Time Architecture For Fast Transient Response And Simple System Design - Available Over-Voltage Protection OVP Crowbar Driver And Power Good Flag LX1663 only - Small, Surface-Mount Packages KEY FEATURES - Socket 7 Microprocessor Supplies including Intel Pentium Processor, AMDK6TM And 6x86TM, Gx86TM and M2TM Processors - Pentium II and Deschutes Processor & L2-Cache Supplies - Voltage Regulator Modules - General Purpose DC:DC Converter Applications PRODUCT HIGHLIGHT C3 0.1µF VID0 VID1 VID2 VID3 VID4 LX1662 1 SS 2 INV V 3 CC_CORE 4 VID0 5 VID1 6 VID2 7 VID3 VC1 14 TDRV 13 GND 12

PDF Datasheet Preview

THE INFINITE POWER OF INNOVATION

Not Recommended For New Design

LX1662 / 62A, LX1663 /63A

SINGLE-CHIP PROGRAMMABLE PWM CONTROLLERS WITH 5-BIT DAC

PRODUCTION DATA SHEET

The LX1662/62A and LX1663/63A 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. Currentsensing mechanism can use PCB trace resistance or the parasitic resistance of the main inductor. The LX1662A and LX1663A have reduced current sense comparator threshold for optimum performance using a PCB trace. 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 . Smallest Package Size. The LX1662 is available in a narrow body 14-pin surface mount IC package for space sensitive applications. The LX1663 provides the additional functions of Over Voltage Protection OVP and Power Good PWRGD output drives for applications requiring output voltage monitoring and protection functions. Ultra-Fast Transient Response Reduces System Cost. The modulated offtime architecture results in the fastest transient response for a given inductor, reducing output capacitor requirements, and reducing the total regulator system cost. Over-Voltage Protection and Power Good Flag. The OVP output in the LX1663 & LX1663A can be used to drive an SCR crowbar circuit to protect the load in the event of a shortcircuit of the main MOSFET. The LX1663 & LX1663A also have a logiclevel Power Good Flag to signal when the output voltage is out of specified limits.

IMPORTANT For the most current data, consult MICROSEMI’s website:

KEY FEATURES
- 5-bit Programmable Output For

CPU Core Supply
- No Sense Resistor Required For

Short-Circuit Current Limiting
- Designed To Drive Either

Synchronous Or NonSynchronous Output Stages
- Lowest System Cost Possible

For Price- Sensitive Pentium And Pentium II Class Applications
- Soft-Start Capability - Modulated, Constant Off-Time

Architecture For Fast Transient Response And Simple System Design
- Available Over-Voltage

Protection OVP Crowbar Driver And Power Good Flag LX1663 only
- Small, Surface-Mount Packages

KEY FEATURES
- Socket 7 Microprocessor

Supplies including Intel Pentium Processor, AMDK6TM And 6x86TM, Gx86TM and M2TM Processors
- Pentium II and Deschutes

Processor & L2-Cache Supplies
- Voltage Regulator Modules - General Purpose DC:DC

Converter Applications

PRODUCT HIGHLIGHT

C3 0.1µF

VID0 VID1 VID2 VID3 VID4

LX1662
1 SS 2 INV V 3

CC_CORE
4 VID0
5 VID1
6 VID2
7 VID3

VC1 14 TDRV 13

GND 12

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived LX1662CN Datasheet file may be downloaded here without warranties.

Datasheet ID: LX1662CN 649005