MCP1802 datasheet(13/24 Pages) MICROCHIP

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DS22053A-page 13

MCP1802

5.0

FUNCTIONAL DESCRIPTION

The MCP1802 CMOS low dropout linear regulator is

intended for applications that need the low current

consumption

while

maintaining

output

voltage

regulation. The operating continuous load range of the

MCP1802 is from 0 mA to 300 mA. The input operating

voltage range is from 2.0V to 10.0V, making it capable

of operating from three or more alkaline cells or single

and multiple Li-Ion cell batteries.

5.1

Input

The input of the MCP1802 is connected to the source

of the P-Channel PMOS pass transistor. As with all

LDO circuits, a relatively low source impedance (10

Ω)

is needed to prevent the input impedance from causing

the LDO to become unstable. The size and type of the

capacitor needed depends heavily on the input source

type (battery, power supply) and the output current

range of the application. For most applications a 0.1 µF

ceramic capacitor will be sufficient to ensure circuit

stability. Larger values can be used to improve circuit

AC performance.

5.2

Output

The maximum rated continuous output current for the

MCP1802 is 300 mA.

A minimum output capacitance of 1.0 µF is required for

small signal stability in applications that have up to

300 mA output current capability. The capacitor type

can be ceramic, tantalum or aluminum electrolytic.

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