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MIC23254

更新时间： 2024-09-21 14:55:31
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美国微芯 - MICROCHIP /
页数 文件大小 规格书
17页 954K
描述
The MIC23254 is a low-input voltage, high-efficiency 4MHz dual 400mA synchronous buck regulator

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MIC23254  
4MHz Dual 400mA Synchronous Buck  
Regulator with Low Input Voltage and  
HyperLight Load™  
General Description  
Features  
The MIC23254 is a low-input voltage, high-efficiency 4MHz  
dual 400mA synchronous buck regulator with HyperLight  
Load™ mode. HyperLight Load™ provides very-high  
efficiency at light loads and ultra-fast transient response  
which is perfectly suited for supplying processor core  
voltages. 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. MIC23254 operates from an input voltage  
down to 2.5V for low battery states. The MIC23254 has a  
tiny 2mm x 2mm Thin MLF® package that saves precious  
board space by requiring only 6 additional external  
components to drive both outputs up to 400mA each.  
• Low input voltage range: 2.5V to 5.5V  
• Dual output current 400mA/400mA  
• Up to 94% peak efficiency and 85% efficiency at 1mA  
• 33µA dual quiescent current  
• 1µH inductor with a 4.7µF capacitor  
• 4MHz in PWM operation  
• Ultra-fast transient response  
• Low voltage output ripple  
• 20mVpp in HyperLight Load™ mode  
• 3mV output voltage ripple in full PWM mode  
• 0.01µA shutdown current  
• Fixed output:10-pin 2mm x 2mm Thin MLF®  
• –40°C to +125°C junction temperature range  
The device is designed for use with a 1µH inductor and a  
4.7µF output capacitor that enables a sub-1mm height.  
The MIC23254 has a very-low quiescent current of 33µA  
with both outputs enabled and can achieve over 85%  
efficiency at 1mA. At higher loads the MIC23254 provides a  
constant switching frequency around 4MHz while providing  
peak efficiencies over 90%.  
Applications  
• Mobile handsets  
• Portable media players  
• Portable navigation devices (GPS)  
• WiFi/WiMax/WiBro modules  
• Digital cameras  
The MIC23254 fixed output voltage option is available in a  
10-pin 2mm x 2mm Thin MLF®. The MIC23254 is designed  
to operate over the junction operating range from –40°C to  
+125°C.  
Data sheets and support documentation can be found on  
Micrel’s web site at: www.micrel.com.  
• Wireless LAN cards  
• USB Powered Devices  
____________________________________________________________________________________________________________  
Typical Application  
Efficiency  
V
OUT = 1.8V  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
V
V
IN = 3.0V  
V
IN = 3.6V  
IN = 2.7V  
V
IN = 4.2V  
L = 1µH  
OUT = 4.7µF  
C
1
10  
100  
1000  
LOAD (mA)  
HyperLight Load is a trademark of Micrel, Inc.  
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, 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  
M9999-052510  
May 2010  
1234567...17

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