MIC5200 datasheet(12/24 Pages) MICROCHIP

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MIC5200

DS20005578A-page 12

 2016 Microchip Technology Inc.

4.0

APPLICATION INFORMATION

4.1

External Capacitors

A 1 μF capacitor is recommended between the

MIC5200 output and ground to prevent oscillations due

to instability. Larger values serve to improve the

regulator's transient response. Most types of tantalum

or aluminum electrolytics will be adequate; film types

will

work, but are costly and therefore

not

recommended. Many aluminum electrolytics have

electrolytes that freeze at about –30°C, so solid

tantalum capacitors are recommended for operation

below –25°C. The important parameters of the

capacitor are an effective series resistance of about 5Ω

or less and a resonant frequency above 500 kHz. The

value of this capacitor may be increased without limit.

At lower values of output current, less output

capacitance is required for output stability. The

capacitor can be reduced to 0.47 μF for current below

10 mA or 0.33 μF for currents below 1 mA. A 1 μF

capacitor should be placed from the MIC5200 input to

ground if there is more than 10 inches of wire between

the input and the AC filter capacitor or if a battery is

used as the input.

The MIC5200 will remain stable and in regulation with

no load in addition to the internal voltage divider, unlike

many other voltage regulators. This is especially

important in CMOS RAM keep-alive applications.

When used in dual supply systems where the regulator

load is returned to a negative supply, the output voltage

must be diode clamped to ground.

4.2

ENABLE Input

The MIC5200 features nearly zero OFF mode current.

When the ENABLE input is held below 0.7V, all internal

circuitry is powered off. Pulling this pin high (over 2.0V)

re-enables the device and allows operation. The

ENABLE pin requires a small amount of current,

typically 15 μA. While the logic threshold is TTL/CMOS

compatible, ENABLE may be pulled as high as 30V,

independent of the voltage on VIN.

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