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MIC24054

更新时间： 2024-11-09 14:54:43
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美国微芯 - MICROCHIP /
页数 文件大小 规格书
30页 1266K
描述
The MIC24054 is a constant-frequency, synchronous DC/DC buck regulator featuring adaptive on-time

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MIC24054 数据手册

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MIC24054  
12V, 9A High-Efficiency Buck Regulator  
SuperSwitcher II  
General Description  
Features  
•
•
Hyper Light Load efficiency – up to 80% at 10mA  
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 9A  
The Micrel MIC24054 is  
a
constant-frequency,  
synchronous DC/DC buck regulator featuring adaptive on-  
time control architecture. The MIC24054 operates over a  
supply range of 4.5V to 19V. It has an internal linear  
regulator which provides a regulated 5V to power the  
internal control circuitry. The MIC24054 operates at a  
constant 600kHz switching frequency in continuous  
conduction mode and can be used to provide up to 9A of  
output current. The output voltage is adjustable down to  
0.8V.  
Micrel’s Hyper Light Load® architecture provides the same  
high-efficiency and ultra-fast transient response as the  
Hyper Speed Controlarchitecture under medium to heavy  
loads, but also maintains high efficiency under light load  
conditions by transitioning to variable frequency,  
discontinuous mode operation.  
•
•
•
•
•
•
•
•
•
Up to 95% efficiency  
Adjustable output voltage from 0.8V to 5.5V  
±1% FB accuracy  
Any Capacitorstable − zero-to-high ESR  
600kHz switching frequency  
Power good (PG) output  
Foldback current-limit and “hiccup” mode short-circuit  
protection  
The MIC24054 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, thermal shutdown, internal  
soft-start to reduce the inrush current, foldback current  
limit and “hiccup mode” short-circuit protection. The  
MIC24054 includes a power good (PG) output to allow  
simple sequencing.  
•
•
•
Safe start-up into pre-biased loads  
–40°C to +125°C junction temperature range  
Available in 28-pin 5mm × 6mm QFN package  
Applications  
•
•
•
Servers and work stations  
Routers, switches, and telecom equipment  
Base stations  
The 9A Hyper Speed Control part, MIC24053, is also  
available on Micrel’s web site.  
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  
85  
80  
75  
70  
65  
60  
55  
50  
1.8V  
1.5V  
1.2V  
1.0V  
0.9V  
0.8V  
VIN = 12V  
0
2
4
6
8
10  
12  
OUTPUT CURRENT (A)  
Hyper Light 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  
M9999-102512-A  
October 2012  
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