FP6131 datasheet(8/10 Pages) FITIPOWER

8 / 10 page

FP6131-1.8-FEB-2012

FP6131

fitipower integrated technology lnc.

Application Information

The

FP6131

series

are

low

dropout

linear

regulators that could provide 300mA output current

at dropout voltage about 300mV.

Besides, current

limit and on chip thermal shutdown features provide

protection against overload or any condition when

the ambient temperature exceeds the junction

temperature.

Output and Input Capacitor

The FP6131 regulator is designed to be stable with

wide range of output capacitors.

The ESR of the

output capacitor affects stability.

Larger value of

the output capacitor decreases the peak deviations

and improves transition response for larger current

changes.

The capacitor types (aluminum, ceramic, and

tantalum) have different characterizations such as

temperature and voltage coefficients.

All ceramic

capacitors are manufactured with a variety of

dielectrics, each with different behavior across

temperature

and

applications.

Common

dielectrics used are X5R, X7R and Y5V.

It is

recommended to use 1

μF to 10μF X5R or X7R

dielectric ceramic capacitors with 30mΩ to 50mΩ

ESR range between device outputs to ground for

transient stability.

The FP6131 is designed to be

stable with low ESR ceramic capacitors and higher

values of capacitors, and ESR could improve

output stability.

So the ESR of output capacitor is very important

because it generates a zero to provide phase lead

for loop stability.

There are no requirements for the ESR on the input

capacitor, but its voltage and temperature coefficient

have to be considered for device application

environment.

Protection Feature

In order to prevent overloading or thermal condition

from damaging the device, FP6131 regulator has

internal thermal and current limit functions designed

to protect the device.

It will rapidly shut off PMOS

pass element during over temperature condition.

Thermal Consideration

The power handling capability of the device will be

limited by allowable operation junction temperature

(125

C). The power dissipated by the device will

be estimated by PD = IOUT  (VIN-VOUT).

The power

dissipation should be lower than the maximum

power dissipation listed in “Absolute Maximum

Ratings” section.

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