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MIC33264YGK

更新时间： 2024-11-21 01:15:15
品牌 Logo 应用领域
麦瑞 - MICREL /
页数 文件大小 规格书
19页 1043K
描述
Buck Regulator with Integrated Inductor

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MIC33264YGK 数据手册

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MIC33263/4  
4MHz, 2A Buck Regulator with Integrated  
Inductor and HyperLight Load®  
Features  
General Description  
• Integrated MOSFETs, inductor  
• 100% duty cycle  
• 4MHz PWM operation in continuous mode  
• 2A output current  
The MIC33263/4 is a highly-efficient synchronous buck  
regulator with an integrated inductor which provides the  
optimal trade-off between footprint and efficiency. The  
MIC33263/4 operates at 4MHz switching frequency and  
provides up to 2A output current. In addition, the 100%  
duty cycle and HyperLight Load® (HLL) mode-of-operation  
delivers very-high efficiency at light loads and ultra-fast  
transient response which makes the MIC33263/4 perfectly  
suited for any space-constrained application and great  
alternative for low dropout regulators. An additional benefit  
of this proprietary architecture is very low output ripple  
voltage throughout the entire load range with the use of  
small output capacitors.  
• Low output voltage ripple  
• 85% typical efficiency at 1mA and up to 93% peak  
efficiency  
• Ultra-fast transient response  
• Advanced copper lead frame design provides superior  
thermal performance  
• Thermal-shutdown and current-limit protection  
• Low-radiated emission (EMI) per EN55022, class B  
• Adjustable output voltage 0.7V to 5V  
• Configurable soft-start with pre-bias start-up capability  
• Auto discharge of 180Ω (MIC33264 only)  
• Low profile 2.5mm × 3.0mm × 1.9mm QFN packages  
• 0.1µA shutdown current  
The MIC33263/4 provides small compact total solution  
size of 4.6mm × 7mm with very few tiny external  
components.  
At higher loads, the MIC33263/4 provides a constant  
switching frequency around 4MHz while achieving peak  
efficiencies up to 93%. It also includes under-voltage  
lockout to ensure proper operation under power-sag  
conditions, internal soft-start to reduce inrush current,  
foldback current limit, power good (PG) indicator, and  
thermal shutdown. The MIC33263/4 is available in a 20-pin  
2.5mm × 3.0mm × 1.9mm QFN package with an operating  
junction temperature range from –40°C to +85°C.  
• 33µA quiescent current  
Applications  
• 5V point-of-load (POL)  
• Low voltage distributed power systems  
• Space-constrained applications  
• Portable devices  
Datasheets and support documentation are available on  
Micrel’s web site at: www.micrel.com.  
• SSD storage systems  
• Digital cameras  
Typical Application  
Efficiency vs.  
Output Current  
100  
90  
80  
VOUT = 2.5V  
70  
VOUT = 1.8V  
VOUT = 3.3V  
60  
50  
40  
30  
20  
VIN = 5V  
10  
10  
100  
1000  
OUTPUT CURRENT(mA)  
HyperLight Load is a registered trademark 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  
Revision 1.1  
May 15, 2014  
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