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MIC261201

更新时间： 2024-11-10 10:57:15
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器
页数 文件大小 规格书
30页 988K
描述
28V, 12A Hyper Speed Control? Synchronous DC/DC Buck Regulator

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MIC261201 数据手册

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MIC261201  
28V, 12A Hyper Speed Control™  
Synchronous DC/DC Buck Regulator  
SuperSwitcher II™  
General Description  
Features  
•
Hyper Speed Control™ architecture enables  
- High Delta V operation (VIN = 28V and VOUT = 0.8V)  
- Small output capacitance  
The Micrel MIC261201 is a constant-frequency, synchronous  
buck regulator featuring a unique adaptive on-time control  
architecture. The MIC261201 operates over an input supply  
range of 4.5V to 28V and provides a regulated output of up to  
12A of output current. The output voltage is adjustable down  
to 0.8V with a guaranteed accuracy of ±1%, and the device  
operates at a switching frequency of 600kHz.  
•
•
•
•
•
•
•
•
•
4.5V to 28V voltage input  
12A output current capability, up to 95% efficiency  
Adjustable output from 0.8V to 5.5V  
±1% feedback accuracy  
Any Capacitor® Stable – zero-to-high ESR  
600kHz switching frequency  
Micrel’s Hyper Speed Control™ architecture allows for ultra-  
fast transient response while reducing the output capacitance  
and also makes (High VIN)/(Low VOUT) operation possible.  
This adaptive tON ripple control architecture combines the  
advantages of fixed-frequency operation and fast transient  
response in a single device.  
No external compensation  
Power Good (PG) output  
Foldback current-limit and “hiccup mode” short-circuit  
protection  
Supports safe startup into a pre-biased load  
–40°C to +125°C junction temperature range  
28-pin 5mm × 6mm MLF® package  
The MIC261201 offers a full suite of protection features to  
ensure protection of the IC during fault conditions. These  
include undervoltage lockout to ensure proper operation  
under power-sag conditions, internal soft-start to reduce  
inrush current, foldback current limit, “hiccup mode” short-  
circuit protection and thermal shutdown. An open-drain  
Power Good (PG) pin is provided.  
•
•
•
Applications  
All support documentation can be found on Micrel’s web  
site at: www.micrel.com.  
•
•
•
•
Distributed power systems  
Communications/networking infrastructure  
Set-top box, gateways and routers  
Printers, scanners, graphic cards and video card  
___________________________________________________________________________________________________________  
Typical Application  
Efficiency (VIN = 12V)  
vs. Output Current  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
5.0V  
3.3V  
2.5V  
1.8V  
1.5V  
1.2V  
1.0V  
0.9V  
0.8V  
VIN = 12V  
0
3
6
9
12  
15  
OUTPUT CURRENT (A)  
Hyper Speed Control, SuperSwitcher II, and Any Capacitor are trademarks of Micrel, Inc.  
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, 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  
M9999-071311-A  
July 2011  
1234567...30

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