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Installation and Operation
2.3.1.2
BOARD POWER UP PROCEDURE:
1. Connect system load to V OUT and GND terminals, maximum load varies with
input and output voltage; see the MCP1640 datasheet for more information on
the maximum load. Typically, the MCP1640 can supply a 3.3V output with
100 mA from a 1.2V input source. Connect the (+) side of the load to V OUT and
the negative (-) load to ground (GND).
2. Set the desired output voltage using the V OUT SEL mini dip switch.
3. Set the enable to the desired state using the EN mini dip switch.
4. When EN is set ON or high, the MCP1640 is enabled and V OUT can be measured
on the V OUT and GND terminals. When EN is low, the MCP1640 is disabled and
V OUT is floating and disconnected from the input.
Capacitors C 3 , C 4 , C 6 and C 7 are not populated. The component pads are provided for
experimental use.
V OUT SEL switch
between 2 and 3.3V
A -meter
A -meter
1.2V Cell
FIGURE 2-2:
V -meter
MCP1640 Evaluation Board Setup.
V -meter
Resistive (min
33 ? /1W)
2.3.1.3
EN AND V OUT SEL SWITCHES FUNCTION
TABLE 2-1:
FUNCTION OF BOARD SWITCHES
State of Switches
V OUT [V] for
SW3 or SW4
EN Switch
ON
ON
OFF
OFF
SW1 or SW2
V OUT SEL Switch
ON
OFF
ON
OFF
SOT-23-6
Converter
2
3.3
0
0
2x3 mm DFN
Converter
3.3
5
0
0
Note that SW2 (V OUT SEL) and SW4 (EN) are used for the SOT-23-6 circuit. Switches
SW1 (V OUT SEL) and SW3 (EN) are used for the 2x3 mm DFN-8 circuit.
? 2010 Microchip Technology Inc.
DS51880A-page 13
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