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MIC2177-3.3CWMT&R PDF预览

MIC2177-3.3CWMT&R

更新时间： 2024-02-05 17:56:54
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器
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16页 183K
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MIC2177-3.3CWMT&R 数据手册

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MIC2177  
2.5A Synchronous Buck Regulator  
General Description  
Features  
The Micrel MIC2177 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 MIC2177 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  
500µA in skip mode  
< 5µA in shutdown mode  
The MIC2177 achieves high efficiency over a wide output  
current range by switching between PWM and skip mode.  
Operatingmodeisautomaticallyselectedaccordingtooutput  
conditions. Switching frequency is preset to 200kHz and can  
be synchronized to an external clock signal of up to 300kHz.  
• 100% duty cycle for low dropout operation  
• Current-mode control  
Simplified loop compensation  
Superior line regulation  
• Current limit  
TheMIC2177usescurrent-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.  
• Thermal shutdown  
• Undervoltage lockout  
Applications  
• High-efficiency, battery-powered supplies  
• Buck (step-down) dc-to-dc converters  
• Cellular telephones  
• Laptop computers  
• Hand-held instruments  
The MIC2177 is packaged in a 20-lead wide power SO  
package with an operating temperature range of –40°C to  
+85°C.  
• Battery Charger  
See the MIC2178 for externally selected PWM or skip-mode  
operation.  
Typical Application  
VIN  
6V to 16.5V  
C2  
22µF  
35V  
C1  
22µF  
35V  
5V Output  
Efficiency  
1,2,9  
U1  
EN  
100  
VIN  
ON  
ENABLE  
20  
10  
OUT  
SW  
OFF  
95  
L1, 33µH  
VOUT  
5V/2.5A  
3,8  
4–7  
12  
MIC2177-5.0  
AUTO  
MODE  
90  
D1  
MBRS140  
VIN = 6V  
Mode  
11  
18  
C7  
220µF  
10V  
C3  
AUTO  
PGND  
220µF  
10V  
85  
80  
75  
70  
PWM  
MODE  
SYNC  
COMP  
13  
R7  
15k  
FB  
BIAS  
19  
SGND  
14–17  
C6  
2.2nF  
C4  
0.01µF  
SKIP  
PWM  
C5  
10nF  
10  
100  
1000 2500  
OUTPUT CURRENT (mA)  
April 1999  
1
MIC2177  
1234567...16

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