APL5502-29U5C-TR View Datasheet(PDF) - Anpec Electronics

Part Name

Description

Manufacturer

APL5502-29U5C-TR

low Iq, low dropout 500 mA fixed voltage regulator

Anpec Electronics 

APL5501/2/3

Thermal Protection

Thermal protection limits total power dissipation in the

device. When the junction temperature exceeds

TJ=+150℃, 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℃, 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 APL5501/2/3 in the event of fault

conditions. For continuous operation, do not exceed

the absolute maximum junction temperature of

T =+150℃.

J

Operating Region and Power Dis-

sipation

The thermal resistance of the case to circuit board,

and the rate of air flow all control the APL5501/2/3’s

maximum power dissipation. The power dissipation

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

mum power dissipation is:

PDMAX = (TJ-TA) / (θ JC + θ CA)

where TJ-TA is the temperature difference between the

junction and ambient air, θ is the thermal resis-

JC

tance

of

the

package,

and

θ

CA

is

the

thermal

resis-

tance through the printed circuit board, copper traces,

and other materials to the ambient air.

The GND pin of the APL5501/3 provide an electrical

connection to ground and channeling heat away. If

power dissipation is large, connect the GND pin to

ground using a large pad or ground plane, can im-

prove the problem of over heat of IC.

Copyright © ANPEC Electronics Corp.

12

Rev. B.2 - May., 2005

www.anpec.com.tw

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