MIC5202 datasheet(12/22 Pages) MICROCHIP

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MIC5202

DS20005614A-page 12

 2016 Microchip Technology Inc.

4.0

APPLICATION INFORMATION

The MIC5202 is a dual linear voltage regulator with low

dropout voltage and low ground current features. Ideal

for battery-operated applications, the MIC5202 offers

1% output voltage accuracy, two independent enable

pins, reversed battery protection, short circuit current

limit and overtemperature protection. When the

MIC5202 is disabled, the ground pin current drops to

sub-micro amp and prolongs the battery life.

4.1

Input Supply Voltage

VIN1 and VIN2 provide power to each internal circuit and

may be tied together.

4.2

Ground

Both ground pins (pin 2 and 4) must be tied to the same

ground potential when using a single power supply.

4.3

Input Capacitor

A 1 µF tantalum or aluminum electrolytic capacitor

should be placed close to each VIN pin if there is more

than 10 inches of copper between the input and the

capacitor, or if a battery is used as the supply.

4.4

Output Capacitor

The MIC5202 requires an output capacitor of 1 µF or

greater to maintain stability. Increasing the output

capacitor leads to an improved transient response;

however, the size and cost also increase. Most

tantalum and aluminum electrolytic capacitors are

adequate; film capacitors will work as well, but at a

higher cost. Many aluminum electrolytics have

electrolytes that freeze at –30°C, so tantalum

capacitors are recommended for operations below

–25°C. An equivalent series resistance (ESR) of 5Ω or

less with a resonance frequency above 500 kHz is

recommended. The output capacitor value may be

increased without limit.

At lower output loads, a smaller output capacitor value

is required for output stability. The capacitor can be

reduced to 0.47 µF for current below 10 mA or 0.33 µF

for current below 1 mA.

4.5

No-Load Stability

Unlike many other voltage regulators, the MIC5202

remains stable and in regulation with no load. This is

especially important in CMOS RAM keep-alive

applications.

4.6

Enable Input

The MIC5202 features dual active-high enable pins

that allow each regulator to be enabled and disabled

independently. Forcing the enable pin low disables the

regulator and sends it to a “zero” off-mode-current

state. In this state, current consumed by the regulator

goes nearly to zero. Forcing the enable pin high

enables the output voltage. The active-high enable pin

typically consumes 8 µA of current and cannot be left

floating; a floating enable pin may cause an

indeterminate state on the output.

4.7

Thermal Shutdown

When the internal die temperature of MIC5202 reaches

the limit, the internal driver is disabled until the die

temperature falls.

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