The MCP1603 is a high efficient, fully integrated 500 mA synchronous buck regulator whose 2.7V to 5.5V input voltage range makes it ideally suited for applications powered from 1-cell Li-Ion or 2-cell/3-cell NiMH/NiCd batteries. 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.
●The MCP1603 is available with either an adjustable or fixed output voltage. The available fixed output voltage options are 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V. When a fixed option is used, only three additional small external components are needed to form a complete solution. Couple this with the low profile, small-foot print packages and the entire system solution is achieved with minimal size.
●Additional protection features include: UVLO, overtemperature, and overcurrent protection.
●Applications:
● Cellular Telephones
● Portable Computers
● Organizers / PDAs
● USB Powered Devices
● Digital Cameras
● Portable Equipment
● +5V or +3.3V Distributed Sys
●Features:
● Over 90% Typical Efficiency
● Output Current Up To 500 mA
● Low Quiescent Current = 45 μA, typical
● Low Shutdown Current = 0.1 μA, typical
● Adjustable Output Voltage:
●\- 0.8V to 4.5V
● Fixed Output Voltage:
●\- 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V
● 2.0 MHz Fixed-Frequency PWM (Heavy Load)
● Automatic PWM to PFM Mode Transition
● 100% Duty Cycle Operation
● Internally Compensated
● Undervoltage Lockout (UVLO)
● Overtemperature Protection
● Space Saving Packages:
● 5-Lead TSOT
● 8-Lead 2X3 DFN
