MIC5203 datasheet(10/20 Pages) MICROCHIP

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MIC5203

DS20006609A-page 10

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2021 Microchip Technology Inc. and its subsidiaries

4.0

APPLICATION INFORMATION

4.1

Input Capacitor

A 0.1 µF capacitor should be placed from IN to GND if

there are more than 10 inches of wire between the

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

as the input.

4.2

Output Capacitor

Typical PNP based regulators require an output

capacitor to prevent oscillation. The MIC5203 is

ultra-stable, requiring only 0.47 µF of output

capacitance for stability. The regulator is stable with all

types of capacitors, including the tiny, low-ESR ceramic

chip capacitors. The output capacitor value can be

increased without limit to improve transient response.

The capacitor should have a resonant frequency above

500 kHz. Ceramic capacitors work, but some

dielectrics have poor temperature coefficients, which

will affect the value of the output capacitor over

temperature. Tantalum capacitors are much more

stable over temperature, but typically are larger and

more expensive. Aluminum electrolytic capacitors will

also work, but they have electrolytes that freeze at

about –30°C. Tantalum or ceramic capacitors are

recommended for operation below –25°C.

4.3

No-Load Stability

The MIC5203 will remain stable and in regulation with

no load (other than the internal voltage divider) unlike

many other voltage regulators. This is especially

important in CMOS RAM keep-alive applications.

4.4

Enable Input

The MIC5203 features nearly zero off-mode current.

When EN (enable input) is held below 0.6V, all internal

circuitry is powered off. Pulling EN high (over 2.0V) re-

enables the device and allows operation. EN draws a

small amount of current, typically 15 µA. While the logic

threshold is TTL/CMOS compatible, EN may be pulled

as high as 20V, independent of VIN.

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