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MIC2179

更新时间： 2024-11-10 22:46:15
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器
页数 文件大小 规格书
16页 132K
描述
1.5A Synchronous Buck Regulator

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MIC2179 数据手册

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MIC2179  
1.5A Synchronous Buck Regulator  
General Description  
Features  
The Micrel MIC2179 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 > 150mA load current  
Skip mode for <150mA load current  
• 150mΩ internal power MOSFETs at 12V input  
• 200kHz preset switching frequency  
• Low quiescent current  
The MIC2179 operates from a 4.5V to 16.5V input and  
features internal power MOSFETs that can supply up to 1.5A  
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 MIC2179 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  
TheMIC2179usescurrent-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  
• Cellular telephones  
• Laptop computers  
• Hand-held instruments  
• Battery Charger  
The MIC2179 and is packaged in a 20-lead SSOP package  
with an operating temperature range of –40°C to +85°C.  
Typical Application  
VIN  
5.4V to 16.5V  
C1  
10µF  
16,17  
U1  
20V  
R1  
20k  
L1  
VIN  
15  
6
22µH  
EN  
3,4  
VOUT  
SW  
PGND  
FB  
3.3V/600mA  
Output Good  
Output Low  
Skip Mode  
PWM Mode  
D1  
MBRM120  
PWRGD  
1,2,  
C2  
MIC  
2179-3.3  
19,20  
100µF  
6.3V  
5
PWM  
13  
7
SYNC  
COMP  
SGND  
BIAS  
9–12  
14  
8
R2  
10k  
C3  
0.01µF  
Pins 4 and 18 are not connected.  
C4  
6.8nF  
Pins 3 and 4 can be connected  
together for a low-impedance  
connection.  
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
MIC2179  
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