MCP1624T-I/CHY

MCP1623/24 is a compact, high-efficiency, fixed-frequency synchronous boost DC/DC converter. It provides an easy-to-use power solution for PIC microcontroller applications powered by one, two, or three alkaline, NiCd, or NiMH cells, or a single Li-Ion or Li-Polymer cell. The regulator employs low-voltage technology, supporting startup from inputs as low as 0.65V without high inrush current or output voltage overshoot. High efficiency is achieved through integrated low-resistance N-channel boost switch and synchronous P-channel switch. All compensation and protection circuits are integrated to minimize external components. For standby applications, the MCP1624 draws only 19µA at no-load operation. The MCP1623 also offers an option to operate in PWM mode only. When disabled (EN=GND), a "true" load disconnect mode isolates the input from the output by removing the normal boost regulator diode path from input to output. This mode draws less than 1 µA of input current. The output voltage is set via a small external resistive voltage divider.

Applications

• Low-power PIC MCU applications powered by one, two, or three alkaline or NiMH/NiCd cells

Key features

• Up to 96% typical efficiency
• 425 mA typical peak input current limit
• Low startup voltage: 0.65V, typical 3.3V VOUT @ 1 mA
• Low input operating voltage: 0.35V, typical 3.3V VOUT @ 1 mA
• Adjustable output voltage range: 2.0V to 5.5V
• Maximum input voltage ≤ VOUT < 5.5V
• Automatic PFM/PWM operation (MCP1624)
• PWM-only operation (MCP1623)
• PWM frequency: 500 kHz
• Low quiescent current: 19 μA (typical PFM mode)
• Internal synchronous rectifier
• Internal compensation
• Inrush current limiting and internal soft-start
• True load disconnect
• Shutdown current (all states): <1 μA
• Low-noise, anti-ringing control
• Over-temperature protection
• SOT-23-6 and 2x3 DFN-8 packages