9

GM6250

300mA ULTRA LOW DROPOUT

POSITIVE VOLTAGE REGULATOR

Application Note

Notes on Usage

1.

It is recommended to operate the GM6250 series within the stipulated absolute maximum ratings

as the IC is liable to malfunction it is operated outside the ratings.

2.

There is a possibility of heat or oscillation as a result of the impedance present between the

power supply and the IC's input. Where impedance is greater 10Ω, it is recommend to use a

3.

4.

stipulated continuous for total power dissipation value (Pd) for the package.

CALCULATING POWER DISSIPATION

The GM6250 series precision linear regulators include thermal shutdown and current limit circuitry to

protect the devices. However, high power regulators normally operate at high junction temperatures so

it is important to calculate the power dissipation and junction temperatures accurately to be sure that

you use and adequate heat sink.

The thermal characteristics of an IC depend four factors:

1.

Maximum Ambient Temperature T

2.

Power Dissipation P

3.

Maximum Junction Temperature T

4.

Thermal Resistance Junction to ambient R

Maximum ambient temperature and power dissipation are determined by the design while the

maximum junction temperature and thermal resistance depend on the manufacturer and the package

type.