onsemi-FDMS3604S

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onsemi-FDMS3604S
FDMS3604S  

MOSFET

– N-Channel,  
POWERTRENCH

)

, Power  
Stage, Asymetric Dual  
General Description  
This device includes two specialized N
−
Channel MOSFETs in a  
dual PQFN package. The switch node has been internally connected to  
enable easy placement and routing of synchronous buck converters.  
The control MOSFET (Q1) and synchronous SyncFET
™
(Q2) have  
been designed to provide optimal power efficiency.  
G1  
D1  
D1  
D1  
D1  
PHASE  
(S1/D2)  
Features  
Q1: N
−
Channel  
G2  
S2  
S2  
•
Max r  
•
Max r  
= 8 m
W
at V
 
= 10
V
, I
 
=
1
3 A  
GS D  
= 11 m
W
at V
 
= 4.5
V
, I
 
=
1
1 A  
S2  
DS(on)  
T
o
p  
Bottom  
DS(on)  
GS  
D
Q2: N
−
Channel  
PQFN8 5×6, 1.27P  
CASE 483AJ  
•
Max r  
= 2.6 m
W
at V
 
= 10
V
, I
 
=
2
3 A  
GS D  
DS(on)  
•
Max r  
= 3.5 m
W
at V
 
= 4.5
V
, I
 
=
2
1 A  
GS D  
DS(on)  
•
Low Inductance Packaging Shortens Rise/Fall Times, Resulting in  
Lower Switching Losses  
MARKING DIAGRAM  
•
MOSFET Integration Enables Optimum Layout for Lower Circuit  
Inductance and Reduced Switch Node Ringing  
•
This Device is Pb
−
Free and is RoHS Compliant  
$Y&Z&3&K  
22CA  
N7CC  
Applications  
•
Computing  
$Y  
&Z  
&3  
&K  
= ON Semiconductor Logo  
= Assembly Plant Code  
= Numeric Date Code  
= Lot Code  
•
Communications  
•
General Purpose Point of Load  
•
Notebook VCORE  
22CA N7CC  
= Specific Device Code  
PIN CONFIGURATION  
Q2  
S2  
S2  
S2  
G2  
5
6
7
8
4
3
2
1
D1  
D1  
D1  
G1  
PHASE  
Q1  
ORDERING INFORMATION  
this data sheet.  
©
Semiconductor Components Industries, LLC, 2011  
1
Publication Order Number:  
January, 2020
−
Rev. 3  
FDMS3604S/D  

FDMS3604S  
MOSFET MAXIMUM RATINGS
T =
 
25
°
C Unless Otherwise Noted  
A
Symbol  
V
DS  
Parameter  
Q1  
30  
33  
20  
Q2  
30  
33  
20  
Units  
Drain to Source Voltage  
V
V
V
A
V
DSt  
V
GS  
Drain to Source Transient Voltage ( t
 
< 100 ns)  
Transient  
Gate to Source Vo

I

D  

Drain Current  
−
Continuous (Package limited)  
T

C

= 25
°
C  
T

C

= 25
°
C  
T

A

= 25
°
C  
30  
60  
40  
130  
−
Continuous (Silicon limited)  
−
Continuous  
40  
100  
−
Pulsed  
E
AS  
P

D  

Single Pulse Avalanche Energy  
40 (Note

60 (Note

mJ  
W
Power Dissipation for Single Operation T

A

= 25
°
C  
Power Dissipation for Single Operation T

A

= 25
°
C  
Operating and Storage Junction
T
e
mperature Range  
T
J
, T
STG  
−
55 to +150  
°
C  
THERMAL CHARACTERISTICS  
Symbol  
Parameter  
Q1  
Q2  
Unit  
°
C/W  
50 (Note

R
θ
JA  
R
θ
JA  
R
θ
JC  
Thermal Resistance, Junction to Ambient  
Thermal Resistance, Junction to Ambient  
Thermal Resistance, Junction to Case  
125 (Note

3.5  
120 (Note

2
PACKAGE MARKING AND ORDERING INFORMATION  
Device Marking  
Device  
Package  
Reel Size  
Tape Width  
Quantity  
22CA N7CC  
FDMS3604S  
Power 56  
13”  
12 mm  
3000 Units  
2

FDMS3604S  
ELECTRICAL CHARACTERISTICS
T =
 
25
°
C Unless Otherwise Noted  
J
Column Head  
Symbol  
Parameter  
Test Conditions  
Type Min  
Typ  
Max  
Units  
OFF CHARACTERISTICS  
BV  
Drain to Source Breakdown  
Voltage  
I
= 250
m
A, V
 
= 0 V I
 
= 1 mA,  
GS  
Q1  
Q2  
30  
30  
V
mV/
°
C  
m
A  
DSS  
D
GS  
D
V
= 0 V  
D
BV  
D
T  
/
Breakdown Voltage
T
e
mperature  
Coefficient  
I
D
= 250
m
A, referenced to 25
°
C  
Q1  
Q2  
15  
12  
DSS  
J
D
I
= 10 mA, referenced to 25
°
C  
I
Zero Gate Voltage Drain Current  
V
V
= 24
V
, V
 
= 0 V  
Q1  
Q2  
1
DSS  
DS  
GS  
GS  
500  
I
Gate to Source Leakage Current,  
Forwad  
= 20
V
, V
 
= 0 V  
Q1  
Q2  
100  
100  
nA  
GSS  
DS  
ON CHARACTERISTICS  
V
GS(th)  
Gate to Source Threshold Voltage  
V
D
= V
 
, I
 
= 250
m
A V
 
= V
 
,  
DS  
Q1  
Q2  
1.1  
1.1  
2
1.8  
2.7  
3
V
GS  
DS  
D
GS  
I
= 1 mA  
D
V  
/
Gate to Source Threshold Voltage  
T
e
mperature Coefficient  
I
I
= 250
m
A, referenced to 25
°
C  
= 10 mA, referenced to 25
°
C  
Q1  
Q2  
−
6  
−
5  
mV/
°
C  
m
W  
GS(th)  
D
T  
D
D
J
r
Drain to Source On Resistance  
Forward Transconductance  
V
= 10 V, I
 
= 13 A V
 
= 4.5 V,  
Q1  
5.8  
8.5  
7.8  
8
DS(on)  
GS  
D
GS  
I
= 11 A  
11  
D
V
= 10 V, I
 
= 13 A , T
 
= 125
°
C  
10.8  
GS  
D
J
V
= 10 V, I
 
= 23 A V
 
= 4.5 V,  
Q2  
2.0  
3.0  
2.6  
2.6  
3.5  
4
GS  
D
GS  
I
= 21 A  
D
V
= 10 V, I
 
= 23 A , T
 
= 125
°
C  
GS  
D
J
g
V
= 5
V
, I
 
=
1
3 A V
 
= 5
V
, I
 
= 23 A  
Q1  
Q2  
61  
130  
S
FS  
DS  
D
DS  
D
DYNAMIC CHARACTERISTICS  
C
Input Capacitance  
Q1:  
DS  
Q2:  
Q1  
Q2  
1340 1785  
3240 4310  
pF  
pF  
pF  
W
iss  
V
= 15
V
, V
 
= 0 V, f = 1
M
Hz  
GS  
C
Output Capacitance  
Reverse Transfer Capacitance  
Gate Resistance  
Q1  
Q2  
485  
645  
oss  
V
= 15
V
, V
 
= 0 V, f = 1
M
Hz  
DS GS  
1230 1635  
C
Q1  
Q2  
53  
103  
80  
155  
rss  
R
Q1  
Q2  
0.2  
0.2  
0.6  
0.8  
2
3
g
SWITCHING CHARACTERISTICS  
t
Turn
−
On Delay Time  
Q1:  
DD  
Q2:  
Q1  
Q2  
8.2  
13  
16  
23  
ns  
ns  
d(on)  
V
= 15 V, I
 
= 13 A, R  
= 6
W  
= 6
W  
D
GEN  
t
r
Rise Time  
Q1  
Q2  
2.5  
4.8  
10  
10  
V
= 15 V, I
 
= 23 A, R  
DD D  
GEN  
t
Turn
−
Off Delay Time  
Fall Time  
Q1  
Q2  
20  
31  
32  
50  
ns  
d(off)  
t
f
Q1  
Q2  
2.2  
3.4  
10  
10  
ns  
Q
Q
T
o
tal Gate Charge  
T
o
tal Gate Charge  
Gate to Source Gate Charge  
Gate to Drain “Miller” Charge  
V
V
= 0 V to 10 V  
= 0 V to 4.5 V  
Q1  
DD  
Q1  
Q2  
21  
47  
29  
66  
nC  
nC  
nC  
nC  
g
g
GS  
V
= 15 V, I
 
= 13 A  
D
Q2  
Q1  
Q2  
10  
22  
14  
31  
GS  
V
DD  
= 15 V, I
 
= 23 A  
D
Q
Q1  
Q2  
3.9  
9
gs  
Q
Q1  
Q2  
3.1  
5.5  
gd  
3

FDMS3604S  
ELECTRICAL CHARACTERISTICS
T =
 
25
°
C Unless Otherwise Noted (continued)  
J
Column Head  
Symbol  
Parameter  
Test Conditions  
Type Min  
Typ  
Max  
Units  
DRAIN
−
SOURCE DIODE CHARACTERISTICS  
V
SD  
Source to Drain Diode Forward  
Voltage  
V
GS  
V
GS  
= 0
V
, I
 
=
1
3
A

Q1  
Q2  
0.8  
0.8  
1.2  
1.2  
V
S
= 0
V
, I
 
=
2
3
A

S
t
Reverse Recovery Time  
Q1  
F
Q2  
Q1  
Q2  
25  
32  
40  
51  
ns  
nC  
rr  
I =
 
13 A, di/dt = 100 A/
m
s  
Q
Reverse Recovery Charge  
Q1  
Q2  
9
39  
18  
62  
rr  
I =
 
23 A, di/dt = 300 A/
m
s  
F
1. R  
is determined with the device mounted on a 1 in2 pad 2 oz copper pad on a 1.5 x 1.5 in. board of FR
−
4 material. R  
is guaranteed  
JC  
q
q
JA  
by design while R  
is determined by the user’s board design.  
q
CA  
b. 50
°
C/W when mounted on  
a. 57
°
C/W when mounted on  
2
a 1 in
 
pad of
 
2 oz
 
copper  
2
a 1 in
 
pad of
 
2 oz
 
copper  
c. 125
°
C/W when mounted on a  
minimum pad of 2 oz copper  
d. 120
°
C/W when mounted on a  
minimum pad of 2 oz copper  
2. Pulse
 
T
e
st: Pulse Width < 300
m
s, Duty cycle < 2.0%.  
3. As
 
an N
−
ch device, the negative Vgs rating is for low duty cycle pulse ocurrence only. No continuous rating is implied.  
4. E
 
of 40 mJ is based on starting T
 
= 25
°
C; N
−
ch: L = 1 mH, I
 
= 9 A, V
 
= 27
V
, V
 
=
1
0
V
.
1
00% test at L = 0.3 mH, I
 
= 14 A.  
AS  
J
AS  
DD  
GS  
AS  
5. E
 
of 60 mJ is based on starting T
 
= 25
°
C; N
−
ch: L = 1 mH, I
 
= 11 A, V
 
= 27 V, V
 
= 10 V. 100% test at L = 0.3 mH, I
 
= 18 A.  
AS  
J
AS  
DD  
GS  
AS  
4
 

FDMS3604S  
TYPICAL CHARACTERISTICS (Q1 N
−
CHANNEL)  
T =
 
25
°
C Unless Otherwise Noted  
J
40  
30  
20  
10  
0
4
3
2
1
V

GS

= 3.5 V  
m
s  
PULSE DURATION = 80  
DUTY CYCLE = 0.5% MAX  
10 V  
V

GS  

=
= 6 V  
V

GS  

V

GS

= 4.5
 
V  
V

GS

= 4
 
V  
4 V  
=
V

GS  

V

GS

= 4.5 V  
V

GS

= 6 V  
3.5 V  
=
V

GS  

10 V  
=
V

GS  

m
s  
PULSE DURATION = 80  
DUTY CYCLE = 0.5% MAX  
0
0
10  
20  
30  
40  
0.0  
0.2  
0.4  
0.6  
0.8  
1.0  
,
DRAIN TO SOURCE VOLTAGE (V)  
V

DS  

I

D

,
DRAIN CURRENT (A)  
Figure 2. Normalized On
−
Resistance vs Drain  
Figure 1. On
−
Region Characteristics  
Current and Gate Voltage  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
20  
I

D

= 13 A  
m
s  
PULSE DURATION = 80  
DUTY CYCLE = 0.5% MAX  
V

GS

= 10 V  
16  
12  
8
I

D

= 13 A  
T

J

= 125

o

C  
4
T

J

= 25

o

C  
0
−
75
−
50
−
25  
0
25 50 75
 
100 125 150  
2
4
6
8
10  
,
JUNCTION TEMPERATURE
(

o

C
)  
T

J  

,
GATE TO SOURCE VOLTAGE (V)  
V

GS  

Figure 3. Normalized On Resistance  
vs Junction Temperature  
Figure 4. On
−
Resistance vs Gate to Source  
Voltage  
1000  

100  
SINGLE PULSE  
R

q

JA

= 125
5
C/W  
10  
m
s  
100  

100  

T

A

= 25
5
C  

1 ms  

1
10  
10 ms  
100 ms  
1 s  

THIS AREA IS  
LIMITED BY r  
DS(on)  

1
SINGLE PULSE  
0.1  

T

J

= MAX RATED  
10 s  

JA

= 125

o

C/W  
R
q
DC  
T

A

= 25

o

C  
100  
10

−
2  

t, PULSE WIDTH (sec)  
0.01  
0.01  
0.1  
10

−
4  

0

.
1

−

3

−

1

100 1000  
1
10  
200  
10  
10  
1
10  

V

D

S

,

D
R

A

I
N

t

o

S

O

U
R

C

E

V

O

L

T

A

G

E

(

V

)  

Figure 5. Transfer Characteristics  
Figure 6. Source to Drain Diode  
Forward Voltage vs Source Current  
5

FDMS3604S  
TYPICAL CHARACTERISTICS (Q1 N
−
CHANNEL)  
T =
 
25
°
C Unless Otherwise Noted (continued)  
J
10  
8
2000  
1000  
I

D

= 13 A  
V

DD

= 10 V  
C

iss  

V

DD

= 15 V  
C

oss  

6
V

DD

=
20 V  
100  
4
C

rss  

2
f = 1 MHz  

GS

= 0 V  
V
0
10  
0
5
10  
15  
20  
25  
0.1  
1
10  
30  
V

DS

, DRAIN TO SOURCE VOLTAGE (V)  
Q

g

, GATE CHARGE (nC)  
Figure 8. Capacitance vs Drain to Source Voltage  
Figure 7. Gate Charge Characteristics  
20  
100  
R

q
JC

= 3.5

o

C/W  
80  
60  
40  
20  
0
10  
V

GS

= 10 V  
T

J

= 25

o

C  
V

GS

= 4.5 V  
T

J

= 10
0

o

C  
T

J

=
12
5

o

C  
Limited by Package  
1
0.01  
0.1  
1
10  
100  
25  
50  
75  
100  
125  
150  
T
,
CASE TEMPERATURE

o

(
C
)  
t

AV

, TIME IN AVALANCHE (ms)  
C
Figure 9. Unclamped Inductive Switching  
Capability  
Figure 10. Maximum Continuous Drain Current  
vs Case Temperature  
100  
1000  
SINGLE PULSE  

q
JA

= 12
5

o

C/W  
100  
R
10  
1
100  
10  
1
T

A

= 2
5

o

C  
1 ms  
10 ms  
THIS AREA IS  
r
LIMITED BY  
100 ms  
DS(on)  
SINGLE PULSE  
T

J

= MAX RATED  
1 s  
0.1  
10 s  
= 125

o  

R
C/W  
q
JA  
DC  
T

A

= 25

o  

C
0.01  
0.01  
0.1  
10

−
4  

10

−
3  

10

−
2  

t, PULSE WIDTH (sec)  
10

−
1  

1
10  
0.1  
1
10  
100  
200  
100 1000  
V

DS

, DRAIN to SOURCE VOLTAGE (V)  
Figure 11. Forward Bias Safe Operating Area  
Figure 12. Single Pulse Maximum Power  
Dissipation  
6

FDMS3604S  
TYPICAL CHARACTERISTICS (Q1 N
−
CHANNEL)  
T =
 
25
°
C Unless Otherwise Noted (continued)  
J
2
1
DUTY CYCLE
−
DESCENDING ORDER  
D = 0.5  
0.2  
0.1  
0.05  
0.02  
0.01  
0.1  
0.01  
P
DM  
t
1
t
2
SINGLE PULSE  

q
JA

= 125

o

C/W  
NOTES:  
DUTY FACTOR: D = t
/t  
R
1
2
PEAK T
 
= P  
J
x Z  
x R  
+ T  
DM  
q
JA  
q
JA
A  
0.001  
10

−
4  

10

−
3  

10

−
2  

10

−
1  

t, RECTANGULAR PULSE DURATION (sec)  
11  
0
100  
1000  
Figure 13. Junction
−
to
−
Ambient Transient Thermal Response Curve  
7

FDMS3604S  
TYPICAL CHARACTERISTICS (Q2 N
−
CHANNEL)  
T =
 
25
°
C Unless Otherwise Noted  
J
100  
80  
60  
40  
20  
0
8
6
4
m
s  
PULSE DURATION = 80  
V

GS

=
10 V  
V

GS

= 4.5
 
V  
V

GS

= 4
 
V  
DUTY CYCLE = 0.5% MAX  
V

GS

= 3 V  
V

GS

= 3.5 V  
V
= 3.5 V  
GS  
m
s  
PULSE DURATION = 80  
DUTY CYCLE = 0.5% MAX  
V

GS

= 4.5 V  
V

GS

=
4 V  
2
0
V

GS

=
3 V  
V

GS

=
10 V  
0
20  
40  
60  
80  
100  
0.0  
0.2  
0.4  
0.6  
0.8  
1.0  
V

DS

,
DRAIN TO SOURCE VOLTAGE (V)  
I

D

,
DRAIN CURRENT (A)  
Figure 15. Normalized On
−
Resistance vs Drain  
Figure 14. On
−
Region Characteristics  
Current and Gate Voltage  
1.6  
1.4  
1.2  
1.0  
0.8  
12  
I

D

= 23 A  
V

GS

= 10 V  
PULSE DURATION = 80
m
s  
DUTY CYCLE = 0.5% MAX  
9
I

D

= 23 A  
6
T

J

= 125

o

C  
3
T

J

= 25

o  

C
0
2
4
6
8
1
0  
−
75
−
50
−
25  
0
25 50 75
 
100 125 150  
T

J

,
JUNCTION TEMPERATURE

o

(
C
)  
V

GS

,
GATE TO SOURCE VOLTAGE (V)  
Figure 16. Normalized On
−
Resistance vs Junction  
Figure 17. On
−
Resistance vs Gate to Source  
Temperature  
Voltage  
100  
100  
PULSE DURATION = 80
m
s  
DUTY CYCLE = 0.5% MAX  
V

GS

= 0 V  
T

J

= 125

o  

80  
10  
1
C
V

DS

= 5 V  
60  
T

J

= 125

o  

C
T

J

= 25

o

C  
40  
20  
0
0.1  
T

J

= 25

o  

C
T

J

=
−
55

o

C  
0.01  
T

J

=
−
55

o

C  
0.001  
1.5  
2.0  
2.5  
3.0  
3.5  
4.0  
0.0  
0.2  
0.4  
0.6  
0.8  
1.0  
1.2  
V

GS

, GATE TO SOURCE VOLTAGE (V)  
V

SD

, BODY DIODE FORWARD VOLTAGE (V)  
Figure 18. Transfer Characteristics  
Figure 19. Source to Drain Diode Forward Voltage  
vs Source Current  
8

FDMS3604S  
TYPICAL CHARACTERISTICS (Q2 N
−
CHANNEL)  
T =
 
25
°
C Unless Otherwise Noted (continued)  
J
10  
8
10000  
1000  
I

D

= 23 A  
C

iss  

V

DD

= 10 V  
C

oss  

6
V

DD

= 15 V  
4
100  
10  
V

DD

=
20 V  
C

rss  

2
f = 1 MHz  
= 0 V  
V
GS  
0
0.1  
1
10  
30  
0
10  
20  
30  
40  
50  
V

DS

, DRAIN TO SOURCE VOLTAGE (V)  
Q

g

, GATE CHARGE (nC)  
Figure 21. Capacitance vs Drain to Source Voltage  
Figure 20. Gate Charge Characteristics  
50  
10  
160  
R

q
JC

= 2

o

C/W  
120  
80  
40  
0
T

J

= 25

o

C  
V

GS

= 10 V  
T

J

= 100

o

C  
V

GS

= 4.5 V  
T

J

= 125

o  

C
Limited by Package  
1
0.01  
0.1  
1
10  
100  
1000  
25  
50  
75  
100  
125  
150  
T
,
CASE TEMPERATURE

o

(
C
)  
t

AV

, TIME IN AVALANCHE (ms)  
C
Figure 22. Unclamped Inductive Switching  
Capability  
Figure 23. Maximum Continuous Drain Current  
vs Case Temperature  
1000  
200  
100  
SINGLE PULSE  

q
JA

= 12
0

o

C/W  
R
100  
10  
1
1 ms  
T

A

= 2
5

o

C  
10  
10 ms  
THIS AREA IS  
LIMITED BY r  
1
100 ms  
DS

(

on
)  
1s  
SINGLE PULSE  
T

J

= MAX RATED  
0.1  
0.01  
10s  
R

q
JA

= 120

o

C/W  
DC  
T

A

= 25

o

C  
0.1  
10

−
3  

10

−
2  

10

−
1  

t, PULSE WIDTH (sec)  
1
10  
100  
1000  
0.01  
0.1  
1
10  
100200  
V

DS

, DRAIN to SOURCE VOLTAGE (V)  
Figure 24. Forward Bias Safe Operating Area  
Figure 25. Single Pulse Maximum Power  
Dissipation  
9

FDMS3604S  
TYPICAL CHARACTERISTICS (Q2 N
−
CHANNEL)  
T =
 
25
°
C Unless Otherwise Noted (continued)  
J
2
1
DUTY CYCLE
−
DESCENDING ORDER  
D = 0.5  
0.2  
0.1  
0.05  
0.02  
0.01  
P
0.1  
0.01  
DM  
t
1
t
2
SINGLE PULSE  

q
J
A

= 120

o  

NOTES:  
DUTY FACTOR: D = t
/t  
R
C/W  
1
2
PEAK T
 
= P
 
x Z  
x R  
+ T  
q
JA
A  
J
DM  
q
JA  
0.001  
10

−
3  

10

−
2  

10

−
1  

t, RECTANGULAR PULSE DURATION (sec)  
1
10  
100  
1000  
Figure 26. Junction
−
to
−
Ambient Transient Thermal Response Curve  
SyncFET Schottky Body Diode Characteristics  
ON Semiconductor’s SyncFET process embeds a  
Schottky diode in parallel with PowerTrench MOSFET.  
This diode exhibits similar characteristics to a discrete  
external Schottky diode in parallel with a MOSFET.  
FDMS3604S.  
Schottky barrier diodes exhibit significant leakage at high  
temperature and high reverse voltage. This will increase the  
power in the device.  
10

−
2  

25  
T

J

= 125

o

C  
20  
10

−
3  

didt = 300 A
/
m
s  
T

J

= 100

o

C  
15  
10  
5
10

−
4  

10

−
5  

T

J

= 25

o

C  
0
10

−
6  

−
5  
0
50  
100  
TIME (ns)  
150  
200  
0
5
10  
15  
20  
25  
30  
V

DS

, REVERSE VOLTAGE (V)  
Figure 27. FDMS3604S SyncFET Body  
Diode Reverse Recovery Characteristics  
Figure 28. SyncFET Body Diode Reverse  
Leakage versus Drain
−
source Voltage  
10  
 

FDMS3604S  
APPLICATION INFORMATION  
Switch Node Ringing Suppression  
ON Semiconductor’s Power Stage products incorporate a  
proprietary design* that minimizes the peak overshoot,  
ringing voltage on the switch node (PHASE) without the  
need of any external snubbing components in a buck  
converter. As shown in the Figure 2

, the Power Stage  
solution rings significantly less than competitor solutions  
under the same set of test conditions.  
Power Stage Device  
*Patent Pending  
Competitorrs Solution  
Figure 29. Power Stage Phase Node Rising Edge, High Turn On  
Figure 30. Shows the Power Stage in a Buck Converter Topology  
11  
 

FDMS3604S  
Recommended PCB Layout Guidelines  
As a PCB designer, it is necessary to address critical issues  
in layout to minimize losses and optimize the performance  
of the power train. Power Stage is a high power density  
solution and all high current flow paths, such as VIN (D1),  
PHASE (S1/D2) and GND (S2), should be short and wide  
for better and stable current flow, heat radiation and system  
performance. recommended
 
layout procedure is  
discussed below to maximize the electrical and thermal  
performance of the part.  
A
Figure 31. Recommended PCB Layout  
Following is a guideline, not a requirement which the PCB designer should consider:  
1. Input ceramic bypass capacitors C1 and C2 must  
be placed close to the D1 and S2 pins of Power  
Stage to help reduce parasitic inductance and High  
Frequency conduction loss induced by switching  
operation. C1 and C2 show the bypass capacitors  
placed close to the part between D1 and S2. Input  
capacitors should be connected in parallel close to  
the part. Multiple input caps can be connected  
depending upon the application  
2. The PHASE copper trace serves two purposes; In  
addition to being the current path from the Power  
Stage package to the output inductor (L), it also  
serves as heat sink for the lower FET in the Power  
Stage package. The trace should be short and wide  
enough to present a low resistance path for the  
high current flow between the Power Stage and the  
inductor. This is done to minimize conduction  
losses and limit temperature rise. Please note that  
the PHASE node is a high voltage and high  
frequency switching node with high noise  
3. Output inductor location should be as close as  
possible to the Power Stage device for lower  
power loss due to copper trace resistance. A  
shorter and wider PHASE trace to the inductor  
reduces the conduction loss. Preferably the Power  
Stage should be directly in line (as shown in  
Figure 32) with the inductor for space savings and  
compactness  
4. The POWERTRENCH Technology MOSFETs  
used in the Power Stage are effective at  
minimizing phase node ringing. It allows the part  
to operate well within the breakdown voltage  
limits. This eliminates the need to have an external  
snubber circuit in most cases. If the designer  
chooses to use an RC snubber, it should be placed  
close to the part between the PHASE pad and S2  
pins to dampen the high
−
frequency ringing  
5. The driver IC should be placed close to the Power  
Stage part with the shortest possible paths for the  
High Side gate and Low Side gates through a wide  
trace connection. This eliminates the effect of  
parasitic inductance and resistance between the  
driver and the MOSFET and turns the devices on  
and off as efficiently as possible. At  
potential. Care should be taken to minimize  
coupling to adjacent traces. The reference layout  

in Figure 31

shows a good balance between the  
thermal and electrical performance of Power Stage  
12  
 

FDMS3604S  
higher
−
frequency operation this impedance can  
limit the gate current trying to charge the  
MOSFET input capacitance. This will result in  
slower rise and fall times and additional switching  
losses. Power Stage has both the gate pins on the  
same side of the package which allows for back  
mounting of the driver IC to the board. This  
provides a very compact path for the drive signals  
and improves efficiency of the part  
7. Use multiple vias on each copper area to  
interconnect top, inner and bottom layers to help  
smooth current flow and heat conduction. Vias  
should be relatively large, around 8 mils to 10  
mils, and of reasonable inductance. Critical high  
frequency components such as ceramic bypass  
caps should be located close to the part and on the  
same side of the PCB. If not feasible, they should  
be connected from the backside via a network of  
low inductance vias  
6. S2 pins should be connected to the GND plane  
with multiple vias for a low impedance grounding.  
Poor grounding can create a noise transient offset  
voltage level between S2 and driver ground. This  
could lead to faulty operation of the gate driver  
and MOSFET  
SyncFET IS trademark of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries.  
POWERTRENCH is registered trademark of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other  
countries.  
13  

MECHANICAL CASE OUTLINE  
PACKAGE DIMENSIONS  
PQFN8 5X6, 1.27P (SAWN TYPE)  
CASE 483AJ  
ISSUE A  
DATE 08 FEB 2021  
Electronic versions are uncontrolled except when accessed directly from the Document Repository.  
Printed versions
 
are uncontrolled
 
except when stamped
 
“CONTROLLED COPY” in red.  
DOCUMENT NUMBER:  
DESCRIPTION:  
98AON13659G  
PQFN8 5X6, 1.27P  
PAGE 1 OF 2  
ON Semiconductor and  
are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.  
ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding  
the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically  
disclaims any and all liability, including without limitation special, consequential or incidental damages. ON Semiconductor does not convey any license under its patent rights nor the  
rights of others.  
©
Semiconductor Components Industries, LLC, 2019  

MECHANICAL CASE OUTLINE  
PACKAGE DIMENSIONS  
PQFN8 5X6, 1.27P (PUNCHED TYPE)  
CASE 483AJ  
ISSUE A  
DATE 08 FEB 2021  
0.10  
(2X)  
C
D
SEE  
DETAIL B  
PKG  
c
C
L
5
8
L2  
PKG  
C
L
E
E1  
(SCALE: 2X)  
0.10  
(2X)  
C
1
4
b1 (8X)  
TOP VIEW  
0.10  
0.08  
C
C
D1  
c
SEE  
DETAIL C  
A
8X  
C
SEATING  
PLANE  
SIDE VIEW  
D2  
(SCALE: 2X)  
0.10  
0.05  
C
C
A B  
e/2  
z1  
L1 (3X)  
1
2
3
4
E3 (6X)  
E4  
k
e4  
E2  
k1  
e3  
D3  
6
8
7
5
L (5X)  
z (3X)  
b (8X)  
e
e1  
BOTTOM VIEW  
Electronic versions are uncontrolled except when accessed directly from the Document Repository.  
Printed versions
 
are uncontrolled
 
except when stamped
 
“CONTROLLED COPY” in red.  
DOCUMENT NUMBER:  
DESCRIPTION:  
98AON13659G  
PQFN8 5X6, 1.27P  
PAGE 2 OF 2  
ON Semiconductor and  
are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.  
ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding  
the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically  
disclaims any and all liability, including without limitation special, consequential or incidental damages. ON Semiconductor does not convey any license under its patent rights nor the  
rights of others.  
©
Semiconductor Components Industries, LLC, 2019  

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