CM3004-25SF Ver la hoja de datos (PDF) - California Micro Devices Corp

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CM3004-25SF

1.0 Amp Dual Mode Low-Dropout CMOS Regulator

California Micro Devices Corp 

PRELIMINARY

CM3004

1.0 Amp Dual Mode Low-Dropout CMOS Regulator

Features

• Internally fixed or adjustable output modes

• 250mV dropout at 1.0A load current

• Operates from 1.7V to 5.5V input supply

• Low Ground current (330µA at 1.0A Load)

• Minimal output capacitance required

• Stable with low ESR ceramic output capacitors

• Current limit protection

• Thermal overload protection

• Reverse current protection in shutdown

• Thermally enhanced 8-lead SOIC package

• Lead-free version available

Applications

• Low-voltage "Core" processors

• Set top boxes

• DVD players

• Personal video recorders

• Graphics Cards

• Gigabit NIC Cards

• PC Motherboards

• Notebooks

Product Description

The CM3004 is a very-low-dropout regulator that offers

both fixed output and fixed/adjustable operating

modes. When the Adjust control pin (ADJ) is grounded,

this device automatically enters a fixed voltage mode

delivering 2.5V out at 1.0A. When the Adjust pin is con-

nected to an external resistor network the device auto-

matically operates as an adjustable regulator. The

Adjust pin can also be tied directly to the OUT pin

which configures the CM3004 as a 1.2V regulator.

An Enable control pin (EN) allows the device to be

placed in a low-current mode.

The CM3004 is fully protected, offering both overload

current limiting, short-circuit protection and high-tem-

perature thermal shutdown. The CM3004 also includes

protection against output to input current flow while in

shutdown.

The CM3004 is supplied in a space-saving, 8-lead

power SOIC package which has been thermally

enhanced via an integral leadframe to ensure maxi-

mum junction-to-ambient power dissipation. The

CM3004 is also available with optional lead-free finish-

ing.

Typical Application Circuits

3.3V

VIN

10µF

CM3004

IN

OUT

EN

ADJ

GND

2.5V/1.0A

VOUT

100nF 10µF

GND

1.8V

VIN

10µF

CM3004

IN

OUT

EN

ADJ

GND

1.2V/1.0A

VOUT

100nF 10µF

Simplified Electrical Schematic

IN

1.7V-5.5V

Controller

Over Current

EN

Short Circuit

Over Temp

1.2V Reference

Voltage

+ EN

-

2.5V Output when ADJ = GND

Automatically selects Adjustable Output

(when external resistors are present)

Fixed

Adj

GND

1.0 AMP

OUT

ADJ

GND

© 2004 California Micro Devices Corp. All rights reserved.

01/10/05 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 1

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