APL5301-14KC-TRL Ver la hoja de datos (PDF) - Anpec Electronics

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APL5301-14KC-TRL

Low IQ, Low Dropout 300mA Fixed Voltage Regulator

Anpec Electronics 

APL5301/2

Thermal Protection

Thermal protection limits total power dissipation in the

device. When the junction temperature exceeds

TJ=+150°C, the thermal sensor generates a logic sig-

nal to turn off the pass transistor and allows IC to

cool. When the IC’s junction temperature is down by

10°C, the thermal sensor will turn the pass transistor

on again, resulting in a pulsed output during continu-

ous thermal protection. Thermal protection is designed

to protect the APL5301/2 in the event of fault

conditions. For continuous operation, do not exceed

the absolute maximum junction temperature of

TJ=+150°C.

Operating Region and Power Dis-

sipation

The thermal resistance of the case to circuit board,

and the rate of air flow all control the APL5301/2’s

maximum power dissipation. The power dissipation

across the device is PD = IOUT (VIN-VOUT) and the maxi-

mum power dissipation is:

P

DMAX

=

(T -T )

JA

/

(θJC

+θCA)

where TJ-TA is the temperature difference between the

junction and ambient air, θJC is the thermal resistance

of the package, and θCA is the thermal resistance

through the printed circuit board, copper traces, and

other materials to the ambient air.

The GND pin of the APL5301 and APL5302 that the

packages ard SOT-23-5, SOT-89-5 AND SOP-8 pro-

vide an electrical connection to ground and channel-

ing heat away. If power dissipation is large, connect

the GND pin to ground using a large pad or ground

plane, can improve the problem of over heat of IC.

Copyright  ANPEC Electronics Corp.

11

Rev. B.1 - Mar., 2004

www.anpec.com.tw

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