Microchip Technology ARD00386 データシート
MCP1640 12V/50 mA TWO CELLS
INPUT BOOST CONVERTER
REFERENCE DESIGN
© 2011 Microchip Technology Inc.
DS51999A-page 13
Chapter 2. Installation and Operation
2.1
INTRODUCTION
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.
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 cur-
rent (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).
50 mA load can be supported from a 2.0V input. The board can deliver more output cur-
rent (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).
2.1.1
Board Features
The MCP1640 Input Boost Converter has the following 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
• Efficiency: up to 75%
• PWM Operation at 500 kHz