MCP1602-180I/MF Microchip

MCP1602 2.0 MHz, 500 mA Synchronous Buck Regulator with Power-Good Features General Description Over 90% Typical Efficiency The MCP1602 is a high efficient, fully integrated 500mA synchronous buck regulator with a power- Output Current: Up To 500 mA good monitor. The 2.7V to 5.5V input voltage range and Power-Good Output with 262 ms Delay low quiescent current (45A, typical) makes the Low Quiescent Current: 45 A (typical) MCP1602 ideally suited for applications powered from Low Shutdown Current: 0.05 A (typical) 1-cell Li-Ion or 2-cell/3-cell NiMH/NiCd batteries. Automatic PWM to PFM Mode Transition At heavy loads, the MCP1602 operates in the 2.0 MHz Adjustable Output Voltage: fixed frequency PWM mode which provides a low - 0.8V to 4.5V noise, low output ripple, small-size solution. When the load is reduced to light levels, the MCP1602 Fixed Output Voltage: automatically changes operation to a PFM mode to - 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V minimize quiescent current draw from the battery. No 2.0 MHz Fixed-Frequency PWM (Heavy Load) intervention is necessary for a smooth transition from Internally Compensated one mode to another. These two modes of operation Undervoltage Lockout (UVLO) allow the MCP1602 to achieve the highest efficiency Overtemperture Protection over the entire operating current range. Overcurrent Protection The open-drain power-good feature of the MCP1602 Space Saving Packages: monitors the output voltage and provides indication when the output voltage is within 94% (typical) of the - 8-Lead MSOP regulation value. The typical 2% hystereses in the - 8-Lead 3x3 DFN power-good transition threshold as well as a 262 ms (typical) delay time ensures accurate power- Applications good signaling. Cellular Telephones The MCP1602 is available in either the 8-pin DFN or Portable Computers MSOP package. It is also available with either an adjustable or fixed output voltage. The available fixed Organizers / PDAs output voltage options are 1.2V, 1.5V, 1.8V, 2.5V, and USB Powered Devices 3.3V. Digital Cameras Additional protection features include: UVLO, Portable Equipment overtemperature, and overcurrent protection. +5V or +3.3V Distributed Systems Package Types MSOP-8 3x3 DFN-8 SHDN P 1 SHDN P 8 1 8 GND GND V L 2 V L 7 CC 2 7 X CC X PG V 3 PG V 6 3 6 IN IN A V /V 4 A V /V 5 GND 4 5 OUT FB GND OUT FB 2007 Microchip Technology Inc. DS22061A-page 1MCP1602 Typical Application Circuit 4.7 H V L 6 V V X 7 IN OUT IN 2.7V to 4.5V 1.5V 500 mA 10 4.7 F 4.7 F V V 2 5 CC FB P 4 A GND 8 GND 0.1 F 1 3 SHDN PG MCP1602 R PULLUP ON Processor Reset OFF V IN DS22061A-page 2 2007 Microchip Technology Inc.