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LX8415-25CST Datasheet(PDF) 6 Page - Microsemi Corporation

Part # LX8415-25CST
Description  0.5 A LOW DROPOUT POSITIVE REGULATORS
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

LX8415-25CST Datasheet(HTML) 6 Page - Microsemi Corporation

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0.5A L OW D ROPOUT P OSITIVE R EGULA TORS
LX8415-xx
PRODUCT DA T ABOOK 1996/1997
Copyright © 1999
Rev. 0.4
1/99
6
P RELIMINAR Y D AT A S HEET
APPLICA TION NOTES
THERMAL CONSIDERATIONS (continued)
Example
Given: V
IN = 5.0V ±5%, VOUT = 2.5V ±3%
I
OUT = 0.5A, TA = 55°C, TJ = 125°C
Rθ
JT = 15°C/W, R
θTS = 5°C/W
Find: The size of a square area of 1oz. copper circuit-
board trace-foil that will serve as a heatsink,
adequate to maintain the junction temperature of the
LX8415 in the ST (SOT-223) package within
specified limits.
Solution: The junction temperature is:
T
J = PD (R
θJT + RθCS + RθSA) + TA
where: P
D
Dissipated power.
Rθ
JT
≡ Thermal resistance from the junction to the
mounting tab of the package.
Rθ
TS ≡ Thermal resistance through the interface
between the IC and the surface on which
it is mounted.
Rθ
SA ≡ Thermal resistance from the mounting surface
of the heatsink to ambient.
T
S
≡ Heat sink temperature.
T
J
T
C
T
S
T
A
Rq JT
Rq CS
Rq SA
T
J - TA
P
D
3.1°C/W
Rθ
SA - 22.3°C/W
First, find the maximum allowable thermal resistance of the
heat sink:
P
D
=
[[V
IN * (1 + TolVIN )] - [VOUT * (1 - TolVOUT)]] * IOUT
P
D
= 1.4W
Rθ
SA =
- (Rθ
JT + R
θTS) ,
Rθ
SA = 29.6°C/W
A test was conducted to determine the thermal characteristics of
1 oz. copper circuit-board trace material. The following equation
describes the observed relationship between the area of a square
copper pad, and the thermal resistance from the tab of a SOT-223
package soldered at the center of the pad to ambient.
Area
SINK =
in2
Substituting the value for Rθ
SA calculated above, we find that a
square pad with area:
Area
SINK = 0.43 in
2 (0.66" x 0.66"), 280mm2 (17 x 17 mm)
will be required to maintain the LX8415 junction temperature
within specified limits.


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