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MIC2178-3.3YWM PDF预览

MIC2178-3.3YWM

更新时间： 2024-11-12 02:55:55
品牌 Logo 应用领域
美国微芯 - MICROCHIP /
页数 文件大小 规格书
15页 175K
描述
2.5A Synchronous Buck Regulator

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MIC2178-3.3YWM 数据手册

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MIC2178  
Micrel, Inc.  
MIC2178  
2.5A Synchronous Buck Regulator  
General Description  
Features  
The Micrel MIC2178 is a 200kHz synchronous buck (step-  
down) switching regulator designed for high-efficiency, bat-  
tery-powered applications.  
• 4.5V to 16.5V input voltage range  
• Dual-mode operation for high efficiency (up to 96%)  
PWM mode for > 200mA load current  
Skip mode for < 200mA load current  
• 100mΩ internal power MOSFETs at 12V input  
• 200kHz preset switching frequency  
• Low quiescent current  
The MIC2178 operates from a 4.5V to 16.5V input and  
features internal power MOSFETs that can supply up to 2.5A  
output current. It can operate with a maximum duty cycle of  
100% for use in low-dropout conditions. It also features a  
shutdown mode that reduces quiescent current to less than  
5µA.  
1.0mA in PWM mode  
600µA in skip mode  
< 5µA in shutdown mode  
The MIC2178 achieves high efficiency over a wide output  
current range by operating in either PWM or skip mode. The  
operating mode is externally selected, typically by an intelli-  
gentsystem, whichchoosestheappropriatemodeaccording  
to operating conditions, efficiency, and noise requirements.  
The switching frequency is preset to 200kHz and can be  
synchronized to an external clock signal of up to 300kHz.  
• Current-mode control  
Simplified loop compensation  
Superior line regulation  
• 100% duty cycle for low dropout operation  
• Current limit  
• Thermal shutdown  
• Undervoltage lockout  
TheMIC2178usescurrent-modecontrolwithinternalcurrent  
sensing. Current-mode control provides superior line regula-  
tion and makes the regulator control loop easy to compen-  
sate. The output is protected with pulse-by-pulse current  
limiting and thermal shutdown. Undervoltage lockout turns  
the output off when the input voltage is less than 4.5V.  
Applications  
• High-efficiency, battery-powered supplies  
• Buck (step-down) dc-to-dc converters  
• Palmtop computers  
• Laptop computers  
• Cellular telephones  
TheMIC2178and ispackagedina20-leadwidepowerSOIC  
package with an operating temperature range of –40°C to  
+85°C.  
• Hand-held instruments  
• Battery Chargers  
See the MIC2177 for automatic selection of PWM or skip-  
mode operation.  
Typical Application  
VIN  
5.4V to 18V  
5V Output  
C2  
C1  
22µF  
35V  
Efficiency  
22µF  
35V  
ON  
OFF  
ENABLE  
100  
1,2,9  
U1  
EN  
VIN  
MIC2178-5.0  
R1  
95  
20  
11  
10  
18  
10  
20k  
VOUT  
OUT  
SW  
L1, 33µH  
5V/2.5A  
3,8  
4–7  
12  
Ouput Good  
Output Low  
90  
85  
80  
75  
70  
VIN = 6V  
PWRGD  
D1  
Skip Mode  
MBRS140  
C5  
220µF  
10V  
C6  
PGND  
PWM Mode  
PWM  
220µF  
10V  
FB  
BIAS  
19  
SYNC  
COMP  
13  
SGND  
14–17  
SKIP  
PWM  
R1  
C4  
10k  
R2  
0.01µF  
10k  
C3  
10  
100  
1000 2500  
6.8nF  
OUTPUT CURRENT (mA)  
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com  
M9999-031805  
March 2005  
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MIC2178-3.3YWM 替代型号

型号 品牌 替代类型 描述 数据表
MIC2178-3.3BWM MICROCHIP

完全替代

 Switching Regulator, Current-mode, 6A, 240kHz Switching Freq-Max, PDSO20, SOIC-20

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