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LX1664 Datasheet(PDF) 1 Page - Microsemi Corporation |
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LX1664 Datasheet(HTML) 1 Page - Microsemi Corporation |
1 / 17 page PRODUCT H IGHLIGHT DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC P RODUCTION D AT A S HEET T HE I NFINITE P OWER OF I NNOV A TION LX1664/64A, LX1665/65A P ACKAGE ORDER INFORMATION T A (°C) Plastic DIP 16-pin 0 to 70 LX1664CN LX1665CN LX1664CD LX1665CDW LX1664ACN LX1665ACN LX1664ACD LX1665ACDW N Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (e.g. LX1664CDT) Plastic DIP 18-pin N Plastic SOIC 16-pin D Plastic SOIC Wide 18-pin DW SS TDRV V CC INV V CC_CORE VID0 VID1 VID2 VID3 OV C T BDRV GND V C1 U1 LX1665 VID3 C 5 1µF 12V R 1 V OUT 5V 18-pin Wide-Body SOIC Q 1 IRL3102 2.5µH 6.3V, 1500µF x 3** 14 13 12 11 10 1 2 3 4 5 6 7 C 8 680pF VID2 VID1 VID0 VID4 C 3 0.1µF 0.0025 Supply Voltage for CPU Core 6.3V 1500µF x3 ** Three capacitors for Pentium Four capacitors for Pentium II VID4 L DRV Supply Voltage For I/O Chipset or GTL+ Bus 8 16 15 L FB PWRGD 9 PWRGD OV 17 18 Q 2 IRL3303 Q 4 IRLZ44 C 7 330µF R 5 R 6 L 1 C 2 C 1 C 9 330µF F 1 20A L 2 1µH LX1665 IN A PENTIUM II SINGLE-CHIP POWER SUPPLY SOLUTION Copyright © 1999 Rev. 1.2 11/99 1 11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570 L IN F INITY M ICROELECTRONICS I NC . DESCRIPTION KEY FEATURES The LX1664/64A and LX1665/65A are monolithic switching regulator con- troller 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 with- out 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 com- parator threshold for optimum perfor- mance using a sense resistor. For applica- tions requiring a high degree of accuracy, a conventional sense resistor can be used to sense current. Programmable Synchronous Recti- fier 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 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) 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-syn- chronous 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 regu- lator suitable for powering a 1.5V GTL+ bus or 2.5V clock supply. (continued next page) APPLICATIONS I Socket 7 (Pentium Class) Microprocessor Supplies (including Intel Pentium Processor, AMD-K6TM And Cyrix® 6x86TM, Gx86TM and M2TM Processors) I Pentium II and Deschutes Processor & L2- Cache Supplies I Voltage Regulator Modules IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com. |
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