MCP1702 datasheet(12/26 Pages) MICROCHIP

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MCP1702

DS22008B-page 12

5.0

FUNCTIONAL DESCRIPTION

The MCP1702 CMOS LDO linear regulator is intended

for applications that need the lowest current consump-

tion while maintaining output voltage regulation. The

operating continuous load range of the MCP1702 is

from 0mA to 250mA (VR ≥ 2.5V). The input operating

voltage range is from 2.7V to 13.2V, making it capable

of operating from two or more alkaline cells or single

and multiple Li-Ion cell batteries.

5.1

Input

The input of the MCP1702 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 (up to

100 mA), a 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

MCP1702 is 250 mA (VR ≥ 2.5V). For applications

where VR < 2.5V, the maximum output current is

200 mA.

A minimum output capacitance of 1.0 µF is required for

small signal stability in applications that have up to

250 mA output current capability. The capacitor type

can be ceramic, tantalum or aluminum electrolytic. The

esr range on the output capacitor can range from 0

Ω to

2.0

Ω.

5.3

Output Rise time

When powering up the internal reference output, the

typical output rise time of 500 µs is controlled to

prevent overshoot of the output voltage. There is also

a startup delay time that ranges from 300 µs to 800 µs

based on loading. The startup time is separate from

and precedes the Output Rise Time. The total output

delay is the Startup Delay plus the Output Rise time.

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