Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 8

Copyright

© 2000

Rev. 1.0e, 2005-03-03

LX1882

Charge Pump Doubler with Linear Regulator

I N T E GRA T ED

PR ODUC T S

EVALUATI ON BOA RD

Table 1: Input and Output Pin Assignments

Pin Name

Description

VIN

Input Voltage Test Point. Use this pin to monitor the input voltage.

VOUT

Output Voltage Test Point. Use this pin to monitor output voltage. Output Voltage is determined using the following

FB

Feedback Pin Test Point. Use this pin to monitor feedback voltage. Min = 1.150V, Typical = 1.175V, Max = 1.20V.

CPO

Charge Pump Output Test Point. Use this pin to monitor the charge pump output or connect an external load to this

pin for the charge pump to drive. Note: Maximum output current available is reduced by the amount of current

drawn from the CPO pin.

SHDN

Shutdown Test Point. Use this pin to monitor operating status of device. Logic HIGH = enabled; Logic LOW =

shutdown mode (see Table 2 below).

GND

System Ground Test Points.

External VCC

External DC Input Voltage. Apply a 1.8V to 4.4V input to this pin when switch “VCC” is set to “EXT”. . Clip the

positive lead of the external power supply to the pin of the 2-pin header labeled “External VCC +”. Clip the negative

lead of the external power supply to the pin of the 2-pin header labeled “External VCC –“.

Table 2: Switch Position Assignments

Switch Name

Functional Description

VCC EXT

Use this position when powering the board from an external power supply.

VCC BAT

Use this position when powering the board using “AA” batteries. Three “AA” batteries can be installed

via battery clips located on the back of the board.

SHDN ENABLE

Use this position to enable the LX1882.

SHDN DISABLE

Use this position to disable the LX1882.