Features

• MCP1623/1624 Synchronous Boost Converter. The Microchip MCP1623 and MCP1624 are Adjustable, Fixed Frequency, Synchronous Step-Up DC-DC Converters. Primarily they are designed to offer a compact and highly efficient power supply solution for PIC Microcontrollers in one-, two- and three-cell battery powered applications. The desired output voltage of the device is set by the application of a small external resistor divider. The design allows the regulator to start up without high inrush current or output voltage overshoot from a low 0.65 V input. Combined is a low-resistance N-Channel Boost Switch and Synchronous P-Channel Switch to offer high efficiency. All compensation and protection circuitry is integrated into the device to minimise the required external components. Also featured is a Load Disconnect mode that provides input to output isolation while disabled. This mode consumes less than 1 μA of input current. Features. Up to 96% Typical Efficiency 425 mA Typical Peak Input Current Limit Low Start Up Voltage: 0.65 V (typical) @ 3.3 V V OUT , 1 mA Low Operating Input Voltage: 0.35 V (typical) @ 3.3 V V OUT , 1 mA Adjustable Output Voltage Range: 2.0 V to 5.5 V Automatic PFM/PWM Operation – MCP1624 model only PWM-only Operation – MCP1623 model only 500 kHz PWM Frequency Low Device Quiescent Current: 19 μA (typical, PFM mode) Internal Synchronous Rectifier Internal Compensation Inrush Current Limiting and Internal Soft-Start True Load Disconnect Shutdown Current: < 1 μA Low Noise, Anti-Ringing Control Over-temperature Protection