MAS9162AST1-T データシートの表示（PDF） - Micro Analog systems

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MAS9162AST1-T

80 mALDO Voltage Regulator IC

Micro Analog systems 

DETAILED DESCRIPTION

Maximum power dissipation of the package may

limit output current or input voltage, which can be

used. The power dissipation can be calculated by

using the formula:

( ) Pd = VIN − VOUT * IOUT + VIN * IGND

It shall not exceed the maximum power dissipation,

allowed by the package:

PdMAX

=

TJ(MAX) − TA

R JA

where TJmax is maximum junction temperature

(TJmax = 125°C), TA is ambient temperature and RJA

is junction-to-ambient thermal resistance of the

package.

When assumed that:

TA = + 85 °C

VOUT = 2.5 V

VIN = 5.3 V

the equation results:

PdMAX

=

125°C − 85°C

255.9°C/W

=

0.156

W

from which can be calculated:

IOUTMAX

=

PdMAX

VIN − VOUT

= 55 mA

VIN * IGND is negligible and can be omitted.

So it can be seen that under these conditions the

average output current should not exceed 55 mA.

If higher power dissipation capability is needed,

contact Micro Analog Systems for TSOT 5

packaging option, see Ordering Information p. 10.

DA9162.003

13 March 2003

6 (10)

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