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MIC2174

更新时间： 2024-09-17 10:57:23
品牌 Logo 应用领域
麦瑞 - MICREL 控制器
页数 文件大小 规格书
27页 665K
描述
Synchronous Buck Controller Featuring Adaptive On-Time Control 40V Input, 300kHz

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中文翻译

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MIC2174 数据手册

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MIC2174/MIC2174C  
Synchronous Buck Controller  
Featuring Adaptive On-Time Control  
40V Input, 300kHz  
Hyper Speed Control™ Family  
General Description  
Features  
The Micrel MIC2174/MIC2174C is a fixed-frequency,  
synchronous buck controller featuring adaptive on-time  
control. The MIC2174/MIC2174C operates over an input  
supply range of 3V to 40V at a fixed switching frequency of  
300kHz and is capable of driving 25A of output current.  
The output voltage is adjustable down to 0.8V.  
•
Hyper Speed Control™ architecture enables:  
– High delta V operation (VHSD = 40V and VOUT = 0.8V)  
– Smaller output capacitors than competitors  
3V to 40V input voltage  
•
•
Any CapacitorTM stable  
-Zero ESR to high ESR  
A unique Hyper Speed Control™ architecture allows for  
ultra-fast transient response while reducing the output  
capacitance. It also makes ultra-fast transient response  
while reducing the output capacitance and also allows for  
extremely low duty-cycle operation. The MIC2174 /  
MIC2174C utilizes an adaptive TON ripple controlled  
architecture. A UVLO is provided to ensure proper  
operation under power-sag conditions to prevent the  
external power MOSFET from overheating. A soft-start is  
provided to reduce inrush current. Foldback current limit  
and “hiccup” mode short-circuit protection ensure FET and  
load protection.  
•
•
•
•
•
•
•
300kHz switching frequency  
Adjustable output from 0.8V to 5.5V (VHSD ≤ 28V)  
Adjustable output from 0.8V to 3.6V (VHSD > 28V)  
±1% FB accuracy (MIC2174)  
±3% FB accuracy (MIC2174C)  
Up to 94% efficiency  
Foldback current limit and “hiccup” mode short-circuit  
protection  
•
•
•
Thermal shutdown  
Safe start-up into pre-biased loads  
–40°C to +125°C junction temperature range  
The MIC2174/MIC2174C is available in a 10-pin MSOP  
(MAX1954A-compatible) package with an operating  
junction temperature range from –40°C to +125°C.  
All support documentation can be found on Micrel’s web  
site at: www.micrel.com.  
Applications  
•
•
•
Telecom Networking  
Industrial Equipment  
Distributed DC power systems  
____________________________________________________________________________________________________________  
Typical Application  
12V to 3.3V Efficiency  
100  
95  
90  
85  
80  
75  
70  
65  
60  
VIN=5V  
55  
50  
0
2
4
6
8
10  
OUTPUT CURRENT (A)  
Synchronous Buck Controller Featuring Adaptive On-Time Control  
Hyper Speed Control and Any Capacitor are trademarks 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  
M9999-091310-C  
September 2010  
1234567...27

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