This N-Channel MOSFET has been designed specifically to
improve the overall efficiency of DC/DC converters using
either synchronous or conventional switching PWM
controllers. It has been optimized for low gate charge, low
r
and fast switching speed.
DS(ON)
Applications
• DC/DC converters
D
G
S
D-PAK
TO-252
(TO-252)
MOSFET Maximum RatingsT
SymbolParameterRatingsUnits
V
V
I
E
P
T
D
DSS
GS
AS
D
, T
J
STG
Drain to Source Voltage30V
Gate to Source Voltage±20V
Drain Current
Continuous (T
Continuous (T
Continuous (T
PulsedFigure 4A
Single Pulse Avalanche Energy (Note 2)53mJ
Power dissipation55W
Derate above 25
Operating and Storage Te mperature-55 to 175
= 25oC, VGS = 10V) (Note 1)
C
= 25oC, VGS = 4.5V) (Note 1)51A
C
= 25oC, VGS = 10V, with R
amb
o
C0.37W/
= 25°C unless otherwise noted
C
Features
•r
•r
• High performance trench technology for extremely low
• Low gate charge
• High power and current handling capability
• RoHS Compliant
= 52oC/W)13A
θJA
DS(ON)
DS(ON)
r
DS(ON)
= 9mΩ, V
= 12mΩ, V
= 10V, ID = 35A
GS
= 4.5V, ID = 35A
GS
G
D
S
58A
tm
o
C
o
C
Thermal Characteristics
R
θJC
R
θJA
R
θJA
Thermal Resistance Junction to Case TO-2522.73
Thermal Resistance Junction to Ambient TO-252100
Thermal Resistance Junction to Ambient TO-252, 1in2 copper pad area52
The maximum rated junction temperature, TJM, and the
thermal resistance of the heat dissipating path determines
the maximum allowable device power dissipation, P
application. Therefore the application’s ambient
temperature, T
must be reviewed to ensure that T
Equation 1 mathematically represents the relationship and
(oC), and thermal resistance R
A
is never exceeded.
JM
DM
θJA
, in an
(oC/W)
serves as the basis for establishing the rating of the part.
P
DM
TJMTA–()
------------------- ----------=
R
θJA
(EQ. 1)
125
100
C/W)
o
(
75
θJA
R
50
R
= 33.32+ 23.84/(0.268+Area) EQ.2
θJA
R
= 33.32+ 154/(1.73+Area) EQ.3
θJA
FDD8880
In using surface mount devices such as the TO-252
package, the environment in which it is applied will have a
significant influence on the part’s current and maximum
power dissipation ratings. Precise determination of P
complex and influenced by many factors:
DM
is
1. Mounting pad area onto which the device is attached and
whether there is copper on one side or both sides of t he
board.
2. The number of copper layers and the thickness of the
board.
3. The use of external heat sinks.
4. The use of thermal vias.
5. Air flow and board orientation.
6. For non steady state applications, the pulse width, the
duty cycle and the transient thermal response of the part,
the board and the environment they are in.
Fairchild provides thermal information to assist the
designer’s preliminary application evaluation. Figure 21
defines the R
copper (component side) area. This is for a horizontally
for the device as a function of the top
θJA
positioned FR-4 board with 1oz copper after 1000 seconds
of steady state power with no air flow. This graph provides
the necessary information for calculation of the steady state
junction temperature or power dissipation. Pulse
applications can be evaluated using the Fairchild device
Spice thermal model or manually utilizing the normalized
maximum transient thermal impedance curve.
25
0.010.1110
(0.645)(6.45)(64.5)(0.0645)
AREA, TOP COPPER AREA in2 (cm2)
Figure 21. Thermal Resistance vs Mounting
Pad Area
Thermal resistances corresponding to other copper area s
can be obtained from Figure 21 or by calculation using
Equation 2 or 3. Equation 2 is used for copper area defined
in inches square and equation 3 is for area in centimeters
square. The area, in square inches or square centimeters is
the top copper area including the gate and source pads.
Note: For further discussio n of the PSP ICE mode l, consul t A New PSPICE Sub-Circuit for the Power MOSFET Featuring Global Temperature Options; IEEE Power Electronics Specialist Confere nce Records, 1991, written by William J. Hepp and C. Frank
Wheatley.
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in the labeling, can be reasonably expected to result in a
significant injury of the user.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet IdentificationProduct StatusDefinition
Advance InformationFormative or In Design
This datasheet contains the design specifications for product development.
Specifications may change in any manner without notice.
This datasheet contains preliminary data; supplementary data will be pub-
PreliminaryFirst Production
lished at a later date. Fairchild Semiconductor reserves the right to make
changes at any time without notice to improve design.
No Identification NeededFull Production
ObsoleteNot In Production
@2008 Fairchild Semiconductor Corporation
This datasheet contains final specifications. Fairchild Semiconductor reserves
the right to make changes at any time without notice to improve the design.
This datasheet contains specifications on a product that is discontinued by
Fairchild Semiconductor. The datasheet is for reference information only.
FDD8880 Rev. B3
Rev. I34
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