ADM00556

The MCP1642B Two-Cells to USB Power Evaluation Board is used to evaluate and demonstrate Microchip Technology’s MCP1642B Switching Boost Regulator. This board demonstrates the MCP1642B capabilities in a boost-converter application supplied from two AA batteries or from an external voltage source. A USB cable can be connected to the output of MCP1642B Two-Cells to USB Power Evaluation Board and used to provide power to portable electronic devices when necessary. It can be used to evaluate the MSOP-8 package. The MCP1642B Two-Cells to USB Power Evaluation Board was developed to help engineers reduce the product design cycle time. On the MCP1642B Two-Cells to USB Power Evaluation Board, the output voltage has the value of 5.0V (the fixed value MCP1642B-50 device is used), resulting in a simple and compact application. The footprints for RT and RB (resistor divider connected to the FB pin) are not populated and will only be used if MCP1642B-ADJ, the adjustable option, will be tested. An enable (EN Switch selection) is used to enable and disable the converter. When enabled, the MCP1642B will regulate the output voltage; when disabled, the MCP1642B will disconnect the path from input to output for “true-disconnect”.

• It can be powered by two AA batteries or external power supply
• Input voltage range (V IN ): 1.8V to 5.5V, with V IN V OUT=
• Minimum start-up voltage: 1.8V at V OUT = 5.0V and I OUT = 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°C hysteresis)
• USB A output connector