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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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CM3121 데이터시트(PDF) 1 Page - California Micro Devices Corp |
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CM3121 데이터시트(HTML) 1 Page - California Micro Devices Corp |
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1 / 11 page  © 2004 California Micro Devices Corp. All rights reserved. 11/12/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 1 CM3121 PRELIMINARY Dual Linear Voltage Regulator for DDR-I and DDR-II Memory Features • Fully integrated power solution for DDR memory ICs • Ideal for DDR-I (2.5VDDQ) and DDR-II (1.8VDDQ) • Lowest system cost and smallest footprint with just two external output capacitors • Two linear regulators: - VDDQ regulator with a maximum output current of 1.5A shared by DRAM and VTT regulator - source-sink VTT regulator with maximum out- put current of 0.5A (DDR-I) or 0.3A (DDR-II) • Fault output indicates overcurrent condition in either regulator, under voltage lock-out and over- temperature condition • Reverse current protection if host is powered off • PSOP-8 package with integrated heat spreader • Lead-free versions available Applications • DDR-I and DDR-II memory power for: − Set Top Boxes, DVD Players, Games − Digital TVs, Flat Panel Displays − Printers, Digital Projectors − Embedded systems − Communications systems Product Description The CM3121 provides an integrated power solution for DDR-I and DDR-II memory systems in consumer electron- ics applications. The CM3121 is ideal for a 2.8V to 3.6V supply for DDR-I memory and 2.2V to 2.8V for DDR-II mem- ory. The CM3121 features two independent linear regula- tors for VDDQ and VTT supply regulation. The default voltage for VDDQ is 2.5V. The VDDQ regulator SENSE pin allows for setting VDDQ in the 2.2V to 2.8V range, or DDR-II memories from 1.7V to 1.9V. The VTT regulator output is always half the VDDQ voltage, derived internally. A capacitor should be connected to each of the two outputs. When EN_DDR is set high, the two DDR regulators are dis- abled to minimize overall system power dissipation such as when memory is in standby. The FAULT pin goes low whenever either of the two regula- tors goes into current limit mode, the input voltage drops too far or if overtemp occurs. The CM3121 is available in a PSOP-8 package that has excellent thermal dissipation. It is available with optional lead-free finishing. . Typical Application Circuit Circuit Schematic VREF R R FAULT VTT=1.25V VDDQ = 2.5V VDDQ REGULATOR VTT REGULATOR EN_DDR VCC GND CDDQ DDR MEMORY CPU CORE + I/O CCC CTT Enable DDR Memory # 2.8V to 3.3V SENSE VTT VTT SENSE VTT VDDQ SENSE VDDQ CURRENT LIMIT OVERTEMP LOW INPUT VREF R R FAULT VDDQ REGULATOR VTT REGULATOR GND SENSE VTT VTT SENSE VTT VDDQ SENSE VDDQ CURRENT LIMIT OVERTEMP LOW INPUT SENSE_VTT VTT SENSE_ VDDQ VDDQ VCC EN_DDR |
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