ML22Q533 datasheet(167/178 Pages) ROHM

167 / 178 page

FEDL22Q53X-02

ML22Q53X

■ Limitation on the operation time (Playback operating time)

This LSI operating temperature is 105

OC (max). But the average ambient temperature at 1W playback (8ohm drive) for 10

years in the reliability design is Ta=65

OC. (max (the

package heat resistance θja=32.1[OC/W]))

When this LSI operates 1W playback (8ohm drive) consecutively, the product life changes by the package temperature rise

by the consumption. This limitation does not matter in the state that a speaker amplifier does not play.

The factors to decide the operation time (playback operating time) are the average ambient temperature (Ta), playback Watts

(at the speaker drive mode), the soldering area ratio, and so on. In addition, the limitation on the operation time changes by

the heat designs of the board.

■ Package Heat Resistance Value (Reference Value)

(θja)

The following table is the package heat resistance value θja (reference value).

This value changes the condition of the board (size, layer number, and so on).

Board

θja

Ψjc

Ψjb

Condition

JEDEC 4 layers

(W/L/t=76.2/114.5/1.6(mm))

32.1[

OC/W] 0.70[OC/W] 12.2[OC/W]

Air cooling condition:No wind

(0m/s)

JEDEC 2 layers

(W/L/t=76.2/114.5/1.6(mm))

38.3[

OC/W] 0.74[OC/W] 13.0[OC/W]

the soldering area ratio

*3:100%

*1 : The wiring density : 1st layer(Top) 60% / 2nd layer 100% / 3rd layer 100% / 4th layer(Bottom) 60%.

*2 : The wiring density : 1st layer(Top) 60% / 2nd layer(Bottom) 100%.

*3 : The soldering area ratio is the ratio that the heat sink area of this LSI and a land pattern on the board are soldered. 100%

mean that the heat sink area of this LSI is completely soldered to the land pattern on the board. About the land pattern on the

board, be sure to refer to the next clause (Package Dimensions).

The definition of each temperature is shown below.

Take measures to dissipate heat on the mounting board so that the maximum junction temperature does not exceed 125

OC.

Mounting board

1mm

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