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AP1155ADU Datasheet(PDF) 17 Page - Asahi Kasei Microsystems

Part No. AP1155ADU
Description  15V Input / 1A Output Adjustable Voltage LDO Regulator
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Maker  AKM [Asahi Kasei Microsystems]
Homepage  http://www.akm.com
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AP1155ADU Datasheet(HTML) 17 Page - Asahi Kasei Microsystems

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[AP1155ADU]
Rev.0.0
- 17 -
2014/07
11.8
Operating Region and Power Dissipation
Power dissipation capability is limited by the junction temperature that triggers the built-in overheat
protection circuit. Therefore, power dissipation capability is regarded as an internal limitation. The package
itself does not offer high heat dissipation because of its small size. The package is, however, designed to
release heat effectively when mounted on the PCB. Therefore, the heat-dissipation value will vary depending
on the material, copper pattern, etc. of the PCB on which the package is mounted.
When the regulator loss is large (high ambient temperature, poor heat radiation), the overheat protection
circuit is activated. When this occurs, output current cannot be obtained, and an output voltage drop is
observed. When the junction temperature reaches the set value, the IC stops operating. However, after the IC
has stopped operation and the junction temperature lowers sufficiently, the IC restarts operation immediately.
・How to determine the thermal resistance when installation on PCB
The chip junction temperature during operation is expressed by
25
P
θ
T
D
ja
j
The junction temperature of the AP1155ADU is limited to approximately 145C by the overheat protection
circuit. PD is the value observed when the overheat protection circuit is activated. The following example is
based on an ambient temperature of 25C.
25
P
θ
145
D
ja
120
P
θ
D
ja
D
ja
P
120
θ 
(°C/W)
Fb
V
Out
V
Cont
V
In
GND
GND
Figure 4. Example of AP1155ADU installation on circuit board
Glass epoxy substrate with double-layer wiring (copper pattern thickness: 35m)
In the above installation example, PD is 2200mW. If the temperature exceeds 25C, be sure to derate at
-18.3mW/C.


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