CM3205-00TP Ver la hoja de datos (PDF) - California Micro Devices Corp

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CM3205-00TP

DDR VDDQ and Termination Voltage Regulator

California Micro Devices Corp 

PRELIMINARY

CM3205

Features

DDR VDDQ and Termination Voltage Regulator

Product Description

• 5A continuous current from VDDQ

• 1.8V to 2.6V adjustable VDDQ output voltage

• 600-mV typical VDDQ dropout voltage at 5A

• VTT tracking at 50% of VDDQ

• Source and sink up to 2A VTT current

• Excellent load and line regulation, low noise

• Fast transient response

• Meets JEDEC DDR-I SDRAM power spec.

• Linear regulator design requires no inductors and

has low external component count

• Integrated power MOSFETs

• Dual purpose ADJ/Shutdown pin

• Built-in over-current limit with short-circuit foldback

and thermal shutdown for VDDQ and VTT

• 5mA quiescent current

• TO252 andTO263 packages for high performance

thermal dissipation and easy PC board layout

• Optional RoHS Compliant Lead-free packaging

The CM3205 is a dual-output, low noise linear regula-

tor designed to meet SSTL-2 and SSTL-3 specifica-

tions for DDR-SDRAM VDDQ supply and termination

voltage VTT supply. With integrated power MOSFET’s,

the CM3205 can source up to 5A of VDDQ current, and

source or sink up to 2A VTT current. The typical drop-

out voltage for VDDQ is 600-mV at 5A load current.

The CM3205 provides fast response to transient load

changes. Load regulation is excellent, less than 1%,

from no load to full load. It also has built-in over-current

limits and thermal shutdown at 170°C.

The CM3205 is packaged in an easy-to-use 5-pin

D2PAK (TO263-5) and DPAK (TO252-5). Low thermal

resistance (48°C/W) allows it to withstand 1.7W (1) dis-

sipation at 85°C ambient. It can operate over the indus-

trial ambient temperature range of –40°C to 85°C.

Applications

• DDR memory and active termination buses

• Desktop Computers, Servers

• Residential and Enterprise Gateways

• DSL Modems

• Routers and Switchers

• DVD recorders

• 3D AGP cards

• LCD TV and STB

Typical Application

CM3205

3.3V

1234 5

2.50V , 5A

C hip

S et

VDDQ

680u 4.7u

S/D

887 4.7u

680u

1.25V, 2.5A

845

4.7u

680u

1k

DL0

RT0

DLn

RTn

VDDQ

DDR

REF Memory

VREF

1u

© 2006 California Micro Devices Corp. All rights reserved.

05/08/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com

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