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MIC2178BWMT&R

更新时间： 2024-02-04 06:57:28
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麦瑞 - MICREL 稳压器
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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  
• Hand-held instruments  
• Battery Chargers  
TheMIC2178and ispackagedina20-leadwidepowerSOIC  
package with an operating temperature range of –40°C to  
+85°C.  
See the MIC2177 for automatic selection of PWM or skip-  
mode operation.  
Typical Application  
VIN  
6V to 16.5V  
C1  
22µF  
35V  
C2  
22µF  
35V  
5V Output  
Efficiency  
100  
R1  
20k  
1,2,9  
U1  
95  
L1  
VIN  
33µH  
20  
11  
10  
18  
3,8  
VOUT  
5V/2.5A  
EN  
90  
85  
80  
75  
70  
VIN = 6V  
SW  
PGND  
FB  
D1  
MBRS140  
OUTPUT GOOD  
PWRGD  
OUTPUT LOW  
4–7  
C3  
220µF  
10V  
C4  
MIC  
220µF  
10V  
2178-5.0  
SKIP MODE  
PWM MODE  
PWM  
12  
SYNC  
COMP  
13  
SGND  
BIAS  
19  
SKIP  
PWM  
14–17  
R2  
15k  
10  
100  
1000 2500  
C5  
0.01µF  
OUTPUT CURRENT (mA)  
C6  
10nF  
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com  
June 1998  
1
MIC2178  
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