Microchip MCP1624

Description

The MCP1623/24 is a compact, high-efficiency, fixed frequency, synchronous step-up DC-DC converter. It 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. For standby applications, the MCP1624 operates and consumes only 19 μA while operating at no load. 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 1 μA of input current.

Output voltage is set by a small external resistor divider.

Features

• Up to 96% Typical Efficiency
• 425 mA Typical Peak Input Current Limit:
• IOUT > 50 mA @ 1.2V VIN, 3.3V VOUT
• IOUT > 175 mA @ 2.4V VIN, 3.3V VOUT
• IOUT > 175 mA @ 3.3V VIN, 5.0V VOUT
• Low Start-up Voltage: 0.65V, typical 3.3V VOUT@ 1 mA
• Low Operating Input Voltage: 0.35V, typical3.3VOUT @ 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)

• 500 kHz PWM Frequency
• Low Device Quiescent Current: 19 μA, typicalPFM 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
• Overtemperature Protection
• SOT-23-6 and 2 x 3 DFN-8 Package

Remarks

• For more inductor values Refer table no-14

Typical applications

• One, Two and Three Cell Alkaline and NiMH/NiCd Low-Power PIC® Microcontroller Applications

More information

• Datasheet
• IC product information