ARD00386: 12V @ 50mA, 2 ~ 5Vin, 75%

The MCP1640 12V/50 mA Two Cells Input Boost Converter Reference Design is developed to demonstrate how the MCP1640 device can operate as a high output voltage DC-DC converter when powered from two batteries. This reference design allows boosting from the input range of 2.0V-5V to an output higher than 5.5V of the typical MCP1640 application. High-voltage outputs, such as 9V, 12V or 24V, can be generated from just two alkaline cells.

For this reference design, the output voltage is set at 12V. Typically, a minimum of a 50 mA load can be supported from a 2.0V input. The board can deliver more output current (up to 70 mA) if it is powered with 3.0V. A small 3x3x1 mm inductor offers a good efficiency of up to 75%. Good converter stability is obtained with the B option of MCP1640 (PWM Mode Only and True Output Disconnect options).

Features:

• Input Voltage: Two Alkaline or Lithium Cells, 2.0-3.0V Typical
  
• - Supports extended input range of 2.0V-5.0V
  
• Output Capability:
  
• - Dependent on the input voltage
  
• - 12V/50 mA typical @ 2.0V input
  
• - 12V/70 mA @ 3.3V input
  
• No Load Input Current: 0.2 mA @ 3.0V Input