MCP1804 datasheet(21/38 Pages) MICROCHIP

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DS22200A-page 21

MCP1804

5.0

FUNCTIONAL DESCRIPTION

The MCP1804 CMOS linear regulator is intended for

applications that need the low current consumption

while maintaining output voltage regulation. The

operating continuous load range of the MCP1804 is

from 0 mA to 150 mA. The input operating voltage

range is from 2.0V to 28.0V, making it capable of

operating from a single 12V battery or single and

multiple Li-Ion cell batteries.

5.1

Input

The input of the MCP1804 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

MCP1804 is 150 mA.

A minimum output capacitance of 0.1 µF to 1.0 µF is

required for small signal stability in applications that

have up to 150 mA output current capability. The

capacitor type can be ceramic, tantalum or aluminum

electrolytic.

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