N-Channel Logic Level PWM Optimized UltraFET® Trench Power MOSFETs
General Description
This device employs a new advanced trench MOSFET
Features
• Fast switching
technology and features low gate charge while maintaining
low on-resistance.
Optimized for switching applications, this device improves
the overall efficiency of DC/DC converters and allows
operation to higher switching frequencies.
Applications
• DC/DC converters
DRAIN
(FLANGE)
GATE
SOURCE
•r
•r
•Q
•Q
•C
DRAIN
(FLANGE)
= 0.018Ω (Typ), V
DS(ON)
= 0.028Ω (Typ), V
DS(ON)
(Typ) = 9nC, V
g
(Typ) = 3nC
gd
(Typ) = 970pF
ISS
SOURCE
DRAIN
GATE
GS
= 5V
GS
GS
= 10V
= 4.5V
D
G
S
TO-263ABTO-220AB
MOSFET Maximum Ratings
T
= 25°C unless otherwise noted
A
SymbolParameterRatingsUnits
V
DSS
V
GS
Drain to Source Voltage30V
Gate to Source Voltage
Drain Current
Continuous (T
I
D
Continuous (T
Continuous (T
= 25
C
= 100
C
= 25
C
o
C, V
o
C, V
= 10V)
GS
o
C, V
= 4.5V) 20A
GS
= 10V, R
GS
o
= 43
C/W)9A
JA
PulsedFigure 4A
P
D
T
, T
J
STG
Power dissipation
Derate above 25
o
C
Operating and Storage Temperature-55 to 175
20V
35A
50
0.33
W/
W
o
C
o
C
Thermal Characteristics
R
JC
R
JA
R
JA
Thermal Resistance Junction to Case TO-220, TO-2633
Thermal Resistance Junction to Ambient TO-220, TO-26362
Thermal Resistance Junction to Ambient TO-263, 1in
The maximum rated junction temperature, TJM, and the
thermal resistance of the heat dissipating path determines
the maximum allowable device power dissipation, PDM, in an
application. Therefore the application’s ambient
temperature, TA (oC), and thermal resistance R
must be reviewed to ensure that TJM is never exceeded.
Equation 1 mathematically represents the relationship and
serves as the basis for establishing the rating of the part.
TJMTA–()
P
-------------------------------=
DM
Z
θJA
In using surface mount devices such as the TO-263
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 PDM is
complex and influenced by many factors:
1. Mounting pad area onto which the device is attached and
whether there is copper on one side or both sides of the
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.
(oC/W)
θJA
(EQ. 1)
C/W)
o
(
θJA
R
Figure 21. Thermal Resistance vs Mounting
ISL9N322AP3/ISL9N322AS3ST
80
R
= 26.51+ 19.84/(0.262+Area)
θJA
60
40
20
0.1
AREA, TOP COPPER AREA (in2)
Pad Area
110
Displayed on the curve are R
Electrical Specifications table. The points were chosen to
values listed in the
θJA
depict the compromise between the copper board area, the
thermal resistance and ultimately the power dissipation,
PDM.
Thermal resistances corresponding to other copper areas
can be obtained from Figure 21 or by calculation using
Equation 2. R
times a coefficient added to a constant. The area, in square
is defined as the natural log of the area
θJA
inches is the top copper area including the gate and source
pads.
Note: For further discussion of the PSPICE model, consult A New PSPICE Sub-Circuit for the Power MOSFET Featuring Global Temperature Options; IEEE Power Electronics Specialist Conference Records, 1991, written by William J. Hepp and C. Frank
Wheatley.
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not intended to be an exhaustive list of all such trademarks.
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER
NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD
DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT
OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT
RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, or (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in significant injury to the
user.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet IdentificationProduct StatusDefinition
Advance Information
Preliminary
No Identification Needed
Formative or
In Design
First Production
Full Production
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
Obsolete
Not In Production
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Rev. H4
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