Datasheet > MIC4690

MIC4690

更新时间： 2023-12-06 20:01:39

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
12页	275K
描述
The MIC4690 SuperSwitcher? is an easy-to-use, 500kHz step-down PWM voltage regulator. The MIC4

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MIC4690 数据手册

MIC4690

Micrel

MIC4690

500kHz 1A SuperSwitcher™ Buck Regulator

General Description

Features

The MIC4690 SuperSwitcher™ is an easy-to-use, 500kHz

step-down PWM voltage regulator. The MIC4690 achieves

over1Aofcontinuousoutputcurrentoverawideinputvoltage

range in an 8-lead SO (small outline) package.

• SO-8 package with over 1A output current

• Fixed 500kHz operation

• Wide 4V to 34Vinput voltage range

• Output voltage adjustable to 1.23V

• All surface mount solution

• Internally compensated with fast transient response

• Up to 85% efficiency

• Overcurrent protection

The high switching frequency of the MIC4690 allows the

smallest surface-mount inductors and capacitors to be used.

Internal compensation ensures fast transient response and a

minimum amount of external components.

• Frequency foldback short-circuit protection

• Thermal shutdown

The MIC4690 features a power SO-8 package with a special

lead frame that allows over 1A of continuous current. The

MIC4690, housedinanSO-8, canreplacelargerTO-220and

TO-263 packages in many applications.

Applications

• Simple 1A step-down (buck) regulator

• Replacement of TO-220 and TO-263 designs

• 12V to 5V/3.3V/2.5V/1.8V/1.5V conversion

• 5V to 2.5V/1.8V/1.5V conversion

• On-card switching regulators

• Hard disk drives

The MIC4690 allows for a high degree of safety. It has a wide

input voltage range of 4V to 34V, allowing for it to be used in

applications where input voltage transients may be present.

Built-in safety features include over-current protection, fre-

quency foldback protection, and thermal shutdown.

• Cable modems

The MIC4690 is available in an 8-lead SO package with a

• Positive-to-negative converters

• Simple battery chargers

junction temperature range of –40°C to +125°C.

Typical Application

Power

SOP-8

2.5V Adjustable Converter

Power

SOP-8

1.8V Adjustable Converter

SuperSwitcher is a trademark of Micrel, Inc.

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

April 2005

MIC4690

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