MCP1640_10 datasheet(13/22 Pages) MICROCHIP

13 / 22 page

Installation and Operation

 2010 Microchip Technology Inc.

DS51880A-page 13

2.3.1.2

BOARD POWER UP PROCEDURE:

1. Connect system load to VOUT 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 VOUT and

the negative (-) load to ground (GND).

2. Set the desired output voltage using the VOUT 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 VOUT can be measured

on the VOUT and GND terminals. When EN is low, the MCP1640 is disabled and

VOUT is floating and disconnected from the input.

Capacitors C3, C4, C6 and C7 are not populated. The component pads are provided for

experimental use.

FIGURE 2-2:

MCP1640 Evaluation Board Setup.

2.3.1.3

EN AND VOUT SEL SWITCHES FUNCTION

Note that SW2 (VOUT SEL) and SW4 (EN) are used for the SOT-23-6 circuit. Switches

SW1 (VOUT SEL) and SW3 (EN) are used for the 2x3 mm DFN-8 circuit.

TABLE 2-1:

FUNCTION OF BOARD SWITCHES

State of Switches

VOUT [V] for

SW3 or SW4

EN Switch

SW1 or SW2

VOUT SEL Switch

SOT-23-6

Converter

2x3 mm DFN

Converter

3.3

OFF

3.3

OFF

A -meter

V -meter

A -meter

V -meter

1.2V Cell

Resistive (min

33Ω/1W)

OUT SEL switch

between 2 and 3.3V

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