
www.irf.com
1
2/15/05
IRF6637
DirectFETDescription
The IRF6637 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 MICRO-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 methods and processes. The DirectFET package allows
dual sided cooling to maximize thermal transfer in power systems, improving previous best thermal resistance by 80%.
The IRF6637 balances both low resistance and low charge along with ultra low package inductance to reduce both conduction and switching
losses. The reduced total losses make this product ideal for high efficiency DC-DC converters that power the latest generation of processors
operating at higher frequencies. The IRF6637 has been optimized for parameters that are critical in synchronous buck operating from 12 volt
buss converters including Rds(on) and gate charge to minimize losses in the control FET socke
t.
Applicable DirectFET Outline and Substrate Outline (see p.7,8 for details)
SQ
SX
ST
Fig 1.
Typical On-Resistance Vs. Gate Voltage
Fig 2.
Typical Total Gate Charge vs Gate-to-Source Voltage
Lead and Bromide Free
Low Profile (<0.7 mm)
Dual Sided Cooling Compatible
Ultra Low Package Inductance
Optimized for High Frequency Switching
Ideal for CPU Core DC-DC Converters
Optimized for both Sync.FET and some Control FET
application
Low Conduction and Switching Losses
Compatible with existing Surface Mount Techniques
Click on this section to link to the appropriate technical paper.
Click on this section to link to the DirectFET Website.
Surface mounted on 1 in. square Cu board, steady state.
T
C
measured with thermocouple mounted to top (Drain) of part.
Repetitive rating; pulse width limited by max. junction temperature.
Starting T
J
= 25°C, L = 0.52mH, R
G
= 25
, I
AS
= 11A.
0
4
8
12
16
20
24
QG Total Gate Charge (nC)
0
2
4
6
8
10
12
VG
VDS= 24V
VDS= 15V
ID= 11A
DirectFET
ISOMETRIC
MQ
MX
MT
MP
V
DSS
30V max
Q
g tot
V
GS
R
DS(on)
5.7m
@ 10V
Q
gs2
R
DS(on)
8.2m
@ 4.5V
Q
oss
V
gs(th)
±20V max
Q
gd
Q
rr
11nC
4.0nC
1.0nC
20nC
9.9nC
1.8V
2.0
4.0
6.0
8.0
10.0
VGS, Gate-to-Source Voltage (V)
5
10
15
20
25
T
)
TJ = 25°C
TJ = 125°C
ID = 14A
Absolute Maximum Ratings
Parameter
Units
V
V
DS
V
GS
I
D
@ T
A
= 25°C
I
D
@ T
A
= 70°C
I
D
@ T
C
= 25°C
I
DM
E
AS
I
AR
Drain-to-Source Voltage
Gate-to-Source Voltage
Continuous Drain Current, V
GS
@ 10V
Continuous Drain Current, V
GS
@ 10V
Continuous Drain Current, V
GS
@ 10V
Pulsed Drain Current
Single Pulse Avalanche Energy
Avalanche Current
A
mJ
A
Max.
30
11
59
110
31
11
±20
14