CM3202-00DE Ver la hoja de datos (PDF) - California Micro Devices Corp

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CM3202-00DE

DDR VDDQ and Termination Voltage Regulator

California Micro Devices Corp 

PRELIMINARY

CM3202

Features

DDR VDDQ and Termination Voltage Regulator

Product Description

• Two linear regulators

-Maximum 2A current from VDDQ

-Source and sink up to 2A VTT current

• 1.7V to 2.8V adjustable VDDQ output voltage

• 500mV typical VDDQ dropout voltage at 2A

• VTT tracking at 50% of VDDQ

• Excellent load and line regulation, low noise

• Fast transient response

• Meet JEDEC DDR-I and DDR-II memory 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

• Fast transient response

• 5mA quiescent current

• TDFN-8 and SOIC-8 packages for high performance

thermal dissipation and easy PC board layout

• Optional RoHS Compliant Lead-free packaging

The CM3202 is a dual-output low noise linear regulator

designed to meet SSTL-2 and SSTL-3 specifications

for DDR-SDRAM VDDQ supply and termination voltage

VTT supply. With integrated power MOSFET’s, the

CM3202 can source up to 2A of VDDQ current, and

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

out voltage for VDDQ is 500 mV at 2A load current.

The CM3202 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 CM3202 is packaged in an easy-to-use TDFN-8

and SOIC-8. Low thermal resistance (55°C/W) allows it

to withstand 1.55W (1) dissipation at 85°C ambient. It

can operate over the industrial ambient temperature

range of –40°C to 85°C.

Applications

Note(1) :

• 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

If TDFN-8 is mounted on a double-sided printed circuit board with

two square inches of copper area, it can to withstand 2W dissipation

at 85°C ambient then.

Typical Application

3.3V

220u

220u 4.7u

1

VIN

8

VDDQ

2

VIN

7

VDDQ

CM3202

3

6

VTT

ADJSD

4

4.7u

GND

5

GND

220u 4.7u C hip

S et

887

845

S/D

VDDQ

VTT

1.25V, 2.5A

1k

DL0

RT0

DLn

RTn

VREF

VDDQ

DDR

REF Memory

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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