MCP1603 Data Sheet
http://www.microchip.com/stellent/images/mchpsiteimages/dwnfolder.gif2.0 MHz, 500 mA Synchronous Buck Regulator Data SheetThe MCP1603 is a high efficiency fully integrated 500 mA 2.0 MHz synchronous buck regulator ideally suited for Li-Ion/NiMH Battery powered application powered. At heavy loads, the MCP1603 operates in the 2.0 MHz fixed frequency PWM mode which provides a low noise, low output ripple, small-size solution. When the load is reduced to light levels, the MCP1603 automatically changes operation to a PFM mode to minimize quiescent current draw from the battery. No intervention is necessary for a smooth transition from one mode to another. These two modes of operation allow the MCP1603 to achieve the highest efficiency over the entire operating current range.
Parameter NameValue
Device DescriptionStep-down Regulator/Controller Combination
SW Reg Output0.8 to 4.5V
Typical Active Supply (µA)45
Switching Frequency (kHz)2000
Output Current (mA)500
Output Voltage (V)0.8 to 4.5
Input Voltage Range (V)2.7 to 5.5
Features
Small packages: TSOT-23 and 2x3 DFN
PWM/PFM automatic transistion
Over current and temperature protection
Automatic PWM/PFM mode transition
Eff. 90%, Shutdown Current 100 nA
Small passives 4.5 microhenry, 4.5 microfarad
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