Datasheet

Installation and Operation
 2010-2011 Microchip Technology Inc. DS51922B-page 13
2.2 GETTING STARTED
The MCP1640 Single Quadruple-A Battery Boost Converter Reference Design is fully
assembled and tested to evaluate and demonstrate the MCP1640 products.
2.2.1 Power Input and Output Connection
2.2.1.1 POWERING THE MCP1640 SINGLE QUADRUPLE-A BATTERY BOOST
CONVERTER REFERENCE DESIGN
The MCP1640 Single Quadruple-A Battery Boost Converter Reference Design is
equipped with an innovative Energizer Battery Holder, which protects against the
reverse insertion of the AAAA alkaline battery. If the battery is inserted correctly, the
board will start in Standby mode. To switch the output ON, press the button S1 for 2
seconds. The output is active for approximately 25 seconds. Pressing the button during
this period will turn OFF the output.
Extra connectors are placed on the top side of the board:
• TP1 and TP5 for positive (V
IN
)
• TP2 and TP4 for negative (GND)
These two connectors help engineers power the board from an external power supply.
In this case, the maximum input voltage should not exceed the 3.3V output
(V
IN
<V
OUT
). The output voltage will not remain regulated for input voltages that are
greater than or equal to the output voltage.
The output connector is called “OUT”, and is referenced to GND. The maximum output
current is 130 mA when the board is powered by a quadruple-A alkaline battery, which
has a typical capacity of 600 mAh.
2.2.1.2 BOARD TESTING
To test the board, follow the next steps:
1. Insert the quadruple-A battery in its holder, paying attention to respect the
polarity.
2. Connect a voltmeter and a 47/0.5W resistor, between “OUT” and “–”
connectors, as shown in Figure 2-2.
3. Press and hold the push button for approximately 2 seconds. The LED should be
lit.
4. The LED will be ON for approximately 25 seconds. During this period, verify the
presence of 3.3V at “OUT”.
5. Press and hold the push button for 2 seconds to verify that power turns ON and
OFF.
The resistor R9 is not populated. The component pads are provided for experimental
use. The header J3 is also not populated. It can be used to re-program the
microcontroller.