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MIC24055

更新时间： 2024-11-09 14:52:51
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美国微芯 - MICROCHIP /
页数 文件大小 规格书
29页 1745K
描述
The MIC24055 is a constant-frequency, synchronous buck regulator featuring a unique adaptive on-ti

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MIC24055 数据手册

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MIC24055  
12V, 12A High-Efficiency Buck Regulator  
SuperSwitcher II  
General Description  
Features  
•
Hyper Speed Control architecture enables  
- High delta V operation (VIN = 19V and VOUT = 0.8V)  
- Small output capacitance  
Input voltage range: 4.5V to 19V  
Output current up to 12A  
The Micrel MIC24055 is  
a
constant-frequency,  
synchronous buck regulator featuring a unique adaptive  
on-time control architecture. The MIC24055 operates over  
an input supply range of 4.5V to 19V 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.  
•
•
•
•
•
•
•
•
•
•
Up to 95% efficiency  
Adjustable output from 0.8V to 5.5V  
±1% feedback accuracy  
Micrel’s Hyper Speed Controlarchitecture 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.  
Any Capacitor™ Stable – zero-to-high ESR  
600kHz switching frequency  
)
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  
Available in 28-pin 5mm × 6mm QFN package  
The MIC24055 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.  
•
•
•
The 12A HyperLight Load® part, MIC24056, is also  
available on Micrel’s web site.  
Applications  
•
•
•
Server and work stations  
Routers, switches and telecom equipment  
Base station  
All support documentation can be found on Micrel’s web  
site at: www.micrel.com.  
___________________________________________________________________________________________________________  
Typical Application  
Efficiency (VIN = 12V)  
vs. Output Current  
100  
95  
5.0V  
3.3V  
2.5V  
90  
1.8V  
1.5V  
1.2V  
1.0V  
0.9V  
0.8V  
85  
80  
75  
70  
65  
60  
55  
50  
VIN = 12V  
12 15  
0
3
6
9
OUTPUT CURRENT (A)  
HyperLight Load is a registered trademark of Micrel, Inc.  
Hyper Speed Control, SuperSwitcher II, 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  
M9999-120712-A  
December 2012  
1234567...29

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