
www.irf.com
1
06/02/05
IRF6635
Power MOSFET
d
Typical values (unless otherwise specified)
V
DSS
V
GS
R
DS(on)
30V max
±20V max
1.3m
@ 10V
Q
g tot
Q
gd
Q
gs2
47nC
17nC
4.7nC
Description
The IRF6635 combines the latest HEXFET Power MOSFET Silicon technology with the advanced DirectFET
TM
packaging to
achieve the lowest on-state resistance in a package that has the footprint of a SO-8 and only 0.7 mm profile. The DirectFET
package is compatible with existing layout geometries used in power applications, PCB assembly equipment and vapor phase,
infra-red or convection soldering techniques, when application note AN-1035 is followed regarding the manufacturing meth-
ods and processes. The DirectFET package allows dual sided cooling to maximize thermal transfer in power systems, improv-
ing previous best thermal resistance by 80%.
The IRF6635 balances industry leading on-state resistance while minimizing gate charge along with ultra low package induc-
tance to reduce both conduction and switching losses. The reduced losses make this product ideal for high frequency/high
efficiency DC-DC converters that power high current loads such as the latest generation of microprocessors. The IRF6635 has
been optimized for parameters that are critical in synchronous buck converter’s SyncFET sockets.
Absolute Maximum Ratings
Parameter
V
DS
Drain-to-Source Voltage
V
GS
Gate-to-Source Voltage
I
D
@ T
A
= 25°C
Continuous Drain Current, V
GS
@ 10V
h
I
D
@ T
A
= 70°C
Continuous Drain Current, V
GS
@ 10V
h
I
D
@ T
C
= 25°C
Continuous Drain Current, V
GS
@ 10V
k
I
DM
Pulsed Drain Current
e
E
AS
Single Pulse Avalanche Energy
f
I
AR
Avalanche Current
e
Applicable DirectFET Outline and Substrate Outline (see p.7,8 for details)
c
SQ
SX
ST
Fig 1.
Typical On-Resistance vs. Gate-to-Source Voltage
Notes:
Fig 2.
Total Gate Charge vs. Gate-to-Source Voltage
z
RoHs compliant containing no lead or bromide
c
z
Low Profile (<0.7 mm)
z
Dual Sided Cooling Compatible
c
z
Ultra Low Package Inductance
z
Optimized for High Frequency Switching
c
z
Ideal for CPU Core DC-DC Converters
z
Optimized for for SyncFET socket of Sync. Buck Converter
c
z
Low Conduction and Switching Losses
z
Compatible with existing Surface Mount Techniques
c
c
Click on this section to link to the appropriate technical paper.
d
Click on this section to link to the DirectFET MOSFETs.
e
Repetitive rating; pulse width limited by max. junction temperature.
f
Starting T
J
= 25°C, L = 0.63mH, R
G
= 25
, I
AS
= 25A.
h
Surface mounted on 1 in. square Cu board, steady state.
k
T
C
measured with thermocouple mounted to top (Drain) of part.
MQ
MX
MT
DirectFET
ISOMETRIC
MX
0
10
20
30
40
50
60
QG Total Gate Charge (nC)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
VG
VDS= 24V
VDS= 15V
ID= 25A
Units
V
A
mJ
A
Max.
30
25
180
250
200
25
±20
32
R
DS(on)
1.8m
@ 4.5V
Q
oss
V
gs(th)
29nC
0
1
2
3
4
5
6
7
8
9
10
VGS, Gate -to -Source Voltage (V)
0
2
4
6
8
10
TD
)
ID = 32A
TJ = 25°C
TJ = 125°C
Q
rr
48nC
1.8V
PD - 96981B