amc7585 ETC-unknow, amc7585 Datasheet - Page 7

• Manufacturer Part Number: amc7585
• Description: Dropout Regulator
• Manufacturer: ETC-unknow

Feb 2005
AMC DOC. #: AMC7585_E (LF)
Application Note:
The maximum power dissipation of a single-output regulator:
Thermal consideration:
The AMC7585 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 AMC7585 series will prevent the device from damage due
to excessive power dissipation. When the device temperature rises to approximately 150
turned off.
When power consumption is over about 1.2W (for TO-220/ TO-263 package, 687mW for TO-252 package,
at T
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 © 2002, ADD Microtech Corp.
PCB heat sink size (mm
P
PCB θ
D(MAX)
A
=70
θ
P
θ
θ
o
CS
JT
SA
SA
C), additional heat sink is required to control the junction temperature below 125
D
= [(V
: Dissipated power.
: Thermal resistance from the junction to the mounting tab of the package.
: Thermal resistance through the interface between the IC and the surface on which it is mounted.
: Thermal resistance from the mounting surface to ambient (thermal resistance of the heat sink).
(°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 °C / W)
OUT(NOM)
= the maximum input voltage
= P
= the nominal output current, and
= the nominal output voltage
D
(θ
45
1000
JT
)] × I
+ θ
CS
+ θ
OUT(NOM)
(Bottom View)
SA
38
1500
) + T
+ V
A
7
IN(MAX)
33
2000
through hole vias
× I
5A L
Q
OUT(MAX)
27
3000
OW
D
ROPOUT
O
C, the regulator will be
24
4000
O
C.
AMC7585
www.addmtek.com
R
EGULATOR
21
5000