Microchip MCP1642 | Demoboard MCP1642B-50I/MS

Description

The MCP1642B/D are compact, high-efficiency, fixed-frequency, step-up DC-DC converters. These products provide an easy-to-use power supply solution, with a minimum number of external components for applications powered by one-cell, two-cell, orthree-cell alkaline, Ni-Cd, Ni-MH, one-cell Li-Ion or Li-Polymer batteries.The MCP1642B/D devices operate in Pulse-Width Modulation (PWM), at a fixed 1 MHz switching frequency, featuring Internal Compensation, Overtemperature Protectionand Power Good Open-Drain Output. The device has 1.8V start-up voltage at 5V output and 1 mA load current.There are two shutdown options for the MCP1642B/D family:• True Output Disconnect mode (MCP1642B/D)• Input-to-Output Bypass mode (MCP1642D)For the fixed-output voltage option of the MCP1642B/D devices, the VFB pin is not connected. The output voltage is set by an internal feedback divider. The fixed valuesare: 1.8V, 3.0V, 3.3V, 5.0V (see Table 1-1).On the MCP1642B/D Two-Cells to USB Power Evaluation Board, the fixed output voltage version (MCP1642B/D-50) is used.The goal of the MCP1642B/D Two-Cells to USB Power Evaluation Board is to demonstrate the higher output current capabilities of the MCP1642B/D, supplied fromtwo AA batteries.

Features

• It can be powered by two AA batteries or external power supply
• Input voltage range (VIN): 1.8V to 5.5V, with VIN  VOUT
• Minimum start-up voltage: 1.8V at VOUT = 5.0V and IOUT = 1 mA, resistive load
• Output voltage: 5.0V
• Output current: typical 700 mA @ 5V output, 2.8V input
• PWM operation
• PWM switching frequency: 1 MHz
• Power Good indicator 2 mA LED
• Enable state selectable using EN switch
• Peak input current limit of 1.8A
• Overtemperature protection (if the die temperature exceeds +150°C, with 35°Chysteresis)
• USB A output connector

More information

• Datasheet
• IC product information