© 2004 California Micro Devices Corp. All rights reserved.

08/16/04

430 N. McCarthy Blvd., Milpitas, CA 95035-5112

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Tel: 408.263.3214

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Fax: 408.263.7846

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www.calmicro.com

1

CM3065

PRELIMINARY

2.0 Amp Tri-Mode Low Dropout CMOS Regulator

Features

•

Operates as an adjustable output or a fixed output

regulator with 2 output voltage options

•

1.8V or 2.5V fixed output voltage versions

•

360mV dropout at 2.0A load current

•

Operates from 2.2V to 5.5V input supply

•

Low Ground current (350

µA at 2.0A Load)

•

Stable with low ESR ceramic output capacitor

•

Current limit protection

•

Thermal overload protection

•

Reverse voltage protection

•

Thermally enhanced 8-lead SOIC or 3-lead TO-

263 package

•

Lead-free versions available

Applications

•

Low voltage "Core" processors

•

Graphics cards

•

Gigabit NIC cards

•

PC motherboards

•

Notebook computers

Product Description

The CM3065 family of very low dropout regulators

offers both fixed/adjustable-output and fixed-output

operation capable of delivering up to 2A of current. The

CM3065 devices are fully protected, offering overload

current limiting, short circuit protection, high tempera-

ture thermal shutdown, and reverse voltage protection

to minimize reverse current flow into the output pin.

The CM3065-xxSA/SF (8-lead, SOIC packaged)

devices operate in either adjustable or fixed output

modes. When the ADJ input is grounded, the regulator

operates as a fixed output voltage device at the speci-

fied output voltage. When the ADJ input is connected

to an external resistor network the device operates as

an adjustable regulator. The ADJ input can also be tied

directly to the OUT pin which configures the CM3065

as a 1.2V regulator. The CM3065-xxSA/SF devices

feature an Enable control input (EN), which when set

low, disables the device to a low quiescent current

mode.

The CM3065-xxTO/TN (TO-263 packaged) versions

operate as higher power, fixed output voltage devices

and are available with 1.8V or 2.5V outputs voltages

only.

The CM3065 is available in a space saving, 8-lead

power SOIC which has been thermally enhanced with

an integral leadframe to ensure maximum junction to

ambient power dissipation, or a 3-lead TO-263 pack-

age. Both packages are offered with optional lead-free

finishing.

Simplified Electrical Schematic

Typical Application Circuit

1.2V Reference

Voltage

+

IN

GND

EN

ADJ

Over Current

Short Circuit

Over Temp

-

2.2V-5.5V

Controller

Fixed Output when ADJ = GND

OUT

Automatically selects Adjustable Output

(when external resistors are present)

Fixed

Adj

130K

120K

2..0 AMP

Note 2: ADJ pin is internally tied to GND on CM3065-xxTO/TN devices.

(See notes below for TO-263 devices.)

EN

(Note 1)

(Note 2)

IN

EN

OUT

GND

GND

CM3065-xxSA/SF

ADJ

3.3V

2.0A

R2

R1