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CM3131-11SB

Triple Linear Voltage Regulator for DDR-I/-II Memory

California Micro Devices Corp 

CM3131

Triple Linear Voltage Regulator for DDR-I/-II Memory

Features

• Integrated power solution for DDR-I and DDR-II

memory systems with few external components

• Three all-linear regulators for VDDQ, VTT and

VSTBY power supply applications

• Lowest system cost and smallest footprint for

DDR power solutions

• VDDQ regulator/driver utilizes external N-FET to

provide up to 15A current at 2.5V/1.8V

• VTT source/sink regulator provides up to 2A at

1.25V for DDR-I systems or 0.65A at 0.9V for

the DDR-II memory controller (not DDR-II

memory)

• LDO standby regulator provides up to 500mA at

2.5V for DDR-I and at 1.8V for DDR-II systems

• Can be ganged for higher current applications

• Over temperature and reverse current protection

• Over current protection for VSTBY and VTT

regulator

• Available in 8 lead and 14 lead PSOP packages

• Lead-free versions available

Applications

• Desktop PCs, notebooks, and workstations

• Set top boxes, digital TVs, printers

• Embedded systems

Product Description

The CM3131 family of all-linear regulators provides

an integrated power solution for DDR-I/-II memory

systems in both run-time and standby modes of

operation. The CM3131 is ideal for designs

incorporating both a main 3.3V and a standby (3.3V

or 5V) supply. The CM3131 features three

independent linear regulators for VDDQ, VTT and VSTBY

supply regulation and will maintain an accuracy of

±1% across the operating temperature range.

The CM3131 is offered in two configurations. The

CM3131-01/11 drives a single external N-FET on a

single VDDQ rail. The CM3131-02 drives two external

unmatched N-FETs on two VDDQ rails. Each VDDQ rail

incorporates an adjustment pin (SENSE) to enable

setting VDDQ in the 2.2V to 2.8V range, supporting

DIMMs with different supply requirements or DDR-II

type devices.

The CM3131-01/11 is available in 8-lead PSOP

package and the CM3131-02 is available in 14-lead

PSOP package.

The CM3131 devices are also available with optional

lead-free finishing.

Electrical Schematic

© 2004 California Micro Devices Corp. All rights reserved.

02/02/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 Tel: 408.263.3214 Fax: 408.263.7846

www.calmicro.com

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