AMC76386 ADDTEK [ADDtek Corp], AMC76386 Datasheet - Page 6

• Manufacturer Part Number: AMC76386
• Description: Dual 450mA LDO REGULATOR
• Manufacturer: ADDTEK [ADDtek Corp]

Application Note:
The maximum power dissipation of a single-output regulator:
Thermal consideration:
The AMC76386 series have internal power and thermal limiting circuitry designed to protect the device under overload
conditions. However maximum junction temperature ratings should not be exceeded under continuous normal load
conditions. The thermal protection circuit of AMC76386 series will prevent the device from damage due to excessive
power dissipation. When the device temperature rises to approximately 150
When power consumption is over about 487mW (SOP-8 package, at T
control the junction temperature below 125
The junction temperature is: T
If PC Board copper is going to be used as a heat sink, below table can be used to determine the appropriate size of
copper foil required. For multi-layered PCB, these layers can also be used as a heat sink. They can be connected with
several through hole vias.
Recommended figure of PCB area used as a heat sink.
Copyright © 2006 ADDtek Corp.
PCB heat sink size (mm
P
PCB θ
D(MAX)
P
θ
θ
θ
JT
SA
SA
D
CS
= [(V
: Total Dissipated power.
: T hermal resistance from the junction to the mounting tab of the package.
: T hermal resistance from the mounting surface to ambient (thermal resistance of the heat sink).
: T hermal resistance through the interface between the IC and the surface on which it is mounted.
(
O
C /W )
(typically, θ
(Top View)
IN(MAX)
V
I
I
V
OUT(NOM)
Q
OUT(NOM)
IN(MAX)
2
= the quiescent current the regulator consumes at I
) 500
59
- V
CS
J
< 1.0
OUT(NOM)
= P
= the maximum input voltage
= the nominal output current, and
= the nominal output voltage
D
O
(θ
C /W)
45
1000
JT
+ θ
)] × I
O
CS
C.
+ θ
OUT(NOM)
(Bottom View)
SA
38
1500
) + T
A
+ V
6
IN(MAX)
33
2000
through hole vias
A
× I
=70
Q
OUT(MAX)
O
O
C, the regulator will be turned off.
C), additional heat sink is required to
27
3000
24
4000
DD055_A -- JUNE 2006
AMC76386
21
5000