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MIC4685_10 参数 Datasheet PDF下载

MIC4685_10图片预览
型号: MIC4685_10
PDF下载: 下载PDF文件 查看货源
内容描述: 3A SPAK SuperSwitcher降压型稳压器 [3A SPAK SuperSwitcher Buck Regulator]
分类和应用: 稳压器
文件页数/大小: 17 页 / 332 K
品牌: MICREL [ MICREL SEMICONDUCTOR ]
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MIC4685
3A SPAK SuperSwitcher™
Buck Regulator
General Description
The MIC4685 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 MIC4685 achieves 3A of continuous current in the
7-pin SPAK package.
The thermal performance of the SPAK allows it to replace
TO-220s and TO-263s (D
2
PAKs) in many applications.
The SPAK saves board space with a 36% smaller footprint
than TO-263.
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, only the ground plane of the PCB is
needed for a heat sink.
The MIC4685 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 MIC4685 is available in a 7-pin SPAK package with a
junction temperature range of –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
Low 2mm profile SPAK package
3A continuous output current
Wide 4V to 30V input voltage range (34V transient)
Fixed 200kHz PWM operation
Over 85% efficiency
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
Point-of-load power supplies
Simple high-efficiency step-down regulators
5V to 3.3V/2A conversion
12V to 5V/3.3V/2.5V/1.8V 3A conversion
Dual-output ±5V conversion
Base stations
LCD power supplies
Battery chargers
___________________________________________________________________________________________________________
Typical Application
V
IN
8V to 30V
MIC4685_R
2
5
IN
EN
GND
BS
SW
FB
4, Tab
1
6
3
C
BS
0.33µF/50V
L1
39mH
D1
3A
40V
R1
3.01k
R2
6.49k
V
OUT
1.8V/3A
C
OUT
330µF
6.3V
C
IN
33µF
35V
1.8V Output 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
January 2010
1
M9999-012610