MIC4684_10 MICREL [Micrel Semiconductor], MIC4684_10 Datasheet

MIC4684_10

Manufacturer Part Number

MIC4684_10

Description

2A High-Efficiency SuperSwitcher Buck Regulator

Manufacturer

MICREL [Micrel Semiconductor]

Datasheet

1.MIC4684_10.pdf (16 pages)

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General Description

The MIC4684 is a high-efficiency 200kHz stepdown (buck)

switching regulator. Power conversion efficiency of above

85% is easily obtainable for a wide variety of applications.

The MIC4684 achieves 2A of continuous current in an 8-lead

SO (small outline) package at 60°C ambient temperature.

High efficiency is maintained over a wide output current range

by utilizing a boost capacitor to increase the voltage available

to saturate the internal power switch. As a result of this high

efficiency, no external heat sink is required. The MIC4684,

housed in an SO-8, can replace larger TO-220 and TO-263

packages in many applications.

The MIC4684 allows for a high degree of safety. It has a wide

input voltage range of 4V to 30V (34V transient), allowing

it to be used in applications where input voltage transients

may be present. Built-in safety features include over-current

protection, frequency-foldback short-circuit protection, and

thermal shutdown.

The MIC4684 is available in an 8-lead SO package with a

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

Typical Application

SuperSwitcher is a trademark of Micrel, Inc.

January 2010

MIC4684

6.5V to 25V

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

33µF

35V

Adjustable Buck Converter

VIN

MIC4684BM

GND

2, 6, 7

0.33µF/50V

40V

68µH

3.01k

Ordering Information

Standard

MIC4684BM MIC4684YM

2.5V/1.5A

330µF

6.3V

OUT

Part Number

Pb-Free

Features

• SO-8 package with 2A continuous output current

• Over 85% efficiency

• Fixed 200kHz PWM operation

• Wide 4V to 30V input voltage range

• Output voltage adjustable to 1.235V

• All surface mount solution

• Internally compensated with fast transient response

• Over-current protection

• Frequency foldback short-circuit protection

• Thermal shutdown

Applications

• Simple high-efficiency step-down regulator

• 5V to 3.3V/1.7A converter (60°C ambient)

• 12V to 1.8V/2A converter (60°C ambient)

• On-card switching regulator

• Dual-output ±5V converter

• Battery charger

2A High-Efficiency SuperSwitcher™ Buck Regulator

Voltage

Efficiency vs. Output Current

Adj

100

MIC4684

Junction Temp. Range Package

OUT

OUTPUT CURRENT (A)

vs. Output Current

= 5.0V

0.5

-40°C to +125°C

= 1.8V

Efficiency

OUT

= 3.3V

OUT

1.5

= 2.5V

M9999-012610

Micrel, Inc.

SOP-8

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