MCP1623T-I/CHY

The MCP1623T-I/CHY is a compact high-efficiency fixed frequency synchronous step-up DC-to-DC Converter provides an easy-to-use power supply solution for PIC microcontroller applications powered by either one-cell, two-cell or three-cell alkaline, NiCd, NiMH, one-cell Li-ion or li-polymer batteries. Low-voltage technology allows the regulator to start-up without high inrush current or output voltage overshoot from a low 0.65V input. High efficiency is accomplished by integrating the low resistance N-channel boost switch and synchronous P-channel switch. All compensation and protection circuitry are integrated to minimize external components. The MCP1623 device option is available that operates in PWM-only mode. A true load disconnect mode provides input to output isolation while disabled (EN=GND) by removing the normal boost regulator diode path from input to output. This mode consumes less than 1µA of input current. Output voltage is set by a small external resistor divider.

• PWM-only operation
• Internal synchronous rectifier
• Internal compensation
• Inrush current limiting and internal soft-start
• True load disconnect
• Low noise and anti-ringing control
• Over-temperature protection
• Up to 96% typical efficiency
• Low device quiescent current of 19µA, typical PFM mode
• 425mA Typical peak input current limit
• 0.65V, typical 3.3V VOUT at 1mA Low start-up voltage
• 0.35V, typical 3.3VOUT at 1mA Low operating input voltage
• <lt/>1µA Shutdown current (all states)