onsemi-FDMS3600S

Part #onsemi-FDMS3600S
Download 
onsemi-FDMS3600S
Is Now Part of  
To learn more about ON Semiconductor, please visit our website at  
Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers  
will need to change in order to meet ON Semiconductor’s system requirements. Since the ON Semiconductor  
product management systems do not have the ability to manage part nomenclature that utilizes an underscore  
(_), the underscore (_) in the Fairchild part numbers will be changed to a dash (-). This document may contain  
device numbers with an underscore (_). Please check the ON Semiconductor website to verify the updated  
email any questions regarding the system integration to

.  
ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number  
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. Buyer is responsible for its products and applications using ON  
Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON  
Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s  
technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA  
Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended  
or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out  
of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor  
is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.  

August 2011  
FDMS3600S  
PowerTrench

®

Power Stage  
25 V Asymmetric Dual N-Channel MOSFET  
Features  
General Description  
Q1: N-Channel  
This device includes two specialized N-Channel MOSFE
T
s
i
n 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.  
„
Max r

DS(on)

= 5.6 m
Ω
at V

GS

= 10 V, I

D

= 15 A  
„
Max r

DS(on)

= 8.1 m
Ω
at V

GS

= 4.5 V, I

D

= 14 A  
Q2: N-Channel  
„
Max r

DS(on)

= 1.6 m
Ω
at V

GS

= 10 V, I

D

= 30 A  
„
Max r

DS(on)

= 2.4 m
Ω
at V

GS

= 4.5 V, I

D

= 25 A  
Applications  
„
Low inductance packaging shortens rise/fall times, resulting in  
„
Computing  
lower switching losses  
„
MOSFET integration enables optimum layout for lower circuit  
inductance and reduced switch node ringing  
„
Communications  
„
General Purpose Point of Load  
„
Notebook VCORE  
„
Server  
„
RoHS Compliant  
G1  
Pin 1  
D1  
D1  
D1  
Q2  
D1  
S2  
D1  
5
6
7
8
4
3
2
1
PHASE  
(S1/D2)  
PHASE  
D1  
D1  
S2  
S2  
G2  
G2  
S2  
S2  
G1  
Q1  
S2  
Bottom  
Top  
Power 56  
MOSFET Maximum Ratings
T

A

= 25 °C unless otherwise noted  
Symbol  
V

DS  

V

GS  

Parameter  
Q1  
Q2  
Units  
Drain to Source Voltage  
Gate to Source Voltage  
25  
±20  
30  
25  
±20  
V
V
(Note 3)  
T

C

= 25 °C  
T

C

= 25 °C  
T

A

= 25 °C  
Drain Current  
-Continuous (Package
 
limited)  
-Continuous (Silicon
 
limited)  
-Continuous  
40  
65  
15

1a  

155  
30

1b  

100  
200

5  

2.5

1b  

1.0

1d  

I

D  

A
-Pulsed  
40  
E

AS  

Single Pulse Avalanche Energy  
50

4  

2.2

1a  

1.0

1c  

mJ  
W
Power Dissipation for Single Operation  
Power Dissipation for Single Operation  
Operating and Storage Junction
T
e
mperature Range  
T

A

= 25 °C  
T

A

= 25 °C  
P

D  

T

J

, T

STG  

-55 to +150  
°C  
Thermal Characteristics  
R

θ
JA  

R

θ
JA  

R

θ
JC  

Thermal Resistance, Junction to Ambient  
57

1a  

125

1c  

3.5  
50

1b  

120

1d  

2
Thermal Resistance, Junction to Ambient  
Thermal Resistance, Junction to Case  
°C/W  
Package Marking and Ordering Information  
Device Marking  
Device  
Package  
Reel Size  
13 ”  
Tape Width  
Quantity  
22OA  
N9OC  
FDMS3600S  
Power 56  
12 mm  
3000 units  
1
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  

Electrical Characteristics
T

J

= 25 °C unless otherwise noted  
Symbol  
Parameter  
Test Conditions  
Type  
Min  
Typ  
Max  
Units  
Off Characteristics  
I
I

D

= 250
μ
A, V

GS

= 0 V  

D

= 1 mA, V

GS

= 0 V  
Q1  
Q2  
25  
25  
BV

DSS  

Drain to Source Breakdown Voltage  
V
Δ
BV

DSS  

Δ
T

J  

Breakdown Voltage
T
e
mperature  
Coefficient  
I

D

= 250
μ
A, referenced to 25 °C  

D

= 10 mA, referenced to 25 °C  
Q1  
Q2  
20  
18  
mV/°C  
I
Q1  
Q2  
1
500  
μ
A  
μ
A  
I

DSS  

I

GSS  

Zero Gate Voltage Drain Current  
V

DS

= 20 V, V

GS

= 0 V  
Gate to Source Leakage Current,  
Forward  
Q1  
Q2  
100  
100  
nA  
nA  
V

GS

= 20 V, V

DS

= 0 V  
On Characteristics  
V
V

GS

= V

DS

, I

D

= 250
μ
A  

GS

= V

DS

, I

D

= 1 mA  
Q1  
Q2  
1.1  
1
1.8  
1.5  
2.7  
3
V

GS(th)  

Gate to Source Threshold Voltage  
V
Δ
V

GS(th)  

Δ
T

J  

Gate to Source Threshold Voltage  
T
e
mperature Coefficient  
I

D

= 250
μ
A, referenced to 25 °C  

D

= 10 mA, referenced to 25 °C  
V

GS

= 10 V,
 
I

D

= 15 A  
Q1  
Q2  
-6  
-5  
mV/°C  
I
4.3  
6.2  
5.9  
5.6  
8.1  
8.7  
V
V

GS

= 4.5 V,
 
I

D

= 14 A  

GS

= 10 V,
 
I

D

= 15 A , T

J

= 125 °C  
Q1  
Q2  
r

DS(on)  

Drain to Source On Resistance  
m
Ω  
V
V
V

GS

= 10 V,
 
I

D

= 30 A  

GS

= 4.5 V,
 
I

D

= 25 A  

GS

= 10 V,
 
I

D

= 30 A , T

J

= 125 °C  
1.3  
1.7  
1.8  
1.6  
2.4  
2.7  
V
V

DS

= 5 V,
 
I

D

= 15 A  

DS

= 5 V,
 
I

D

= 30 A  
Q1  
Q2  
67  
171  
g

FS  

Forward Transconductance  
S
Dynamic Characteristics  
Q1  
Q2  
1264  
4042  
1680  
5375  
Q1:  
C

iss  

C

oss  

C

rss  

R

g  

Input Capacitance  
pF  
pF  
pF  
Ω
V

DS

= 13 V, V

GS

= 0
V
, f = 1
M
HZ  
Q1  
Q2  
340  
1207  
450  
1605  
Output Capacitance  
Reverse Transfer Capacitance  
Gate Resistance  
Q2:  
V

DS

= 13 V, V

GS

= 0
V
, f = 1
M
HZ  
Q1  
Q2  
58  
148  
90  
220  
Q1  
Q2  
0.2  
0.2  
0.6  
0.9  
2
3
Switching Characteristics  
Q1  
Q2  
7.9  
13  
16  
23  
t

d(on)  

t

r  

t

d(off)  

t

f  

Turn-On Delay Time  
Rise Time  
ns  
ns  
Q1:  
Q1  
Q2  
2
5.3  
10  
11  
V

DD

= 13 V, I

D

= 15 A, R

GEN

= 6
Ω  
Q1  
Q2  
19  
38  
34  
60  
Q2:  
Turn-Off Delay Time  
Fall Time  
ns  
V

DD

= 13 V, I

D

= 30 A, R

GEN

= 6
Ω  
Q1  
Q2  
1.8  
3.9  
10  
10  
ns  
Q1  
Q2  
19  
59  
27  
82  
Q

g  

T
o
tal Gate Charge  
T
o
tal Gate Charge  
Gate to Source Gate Charge  
Gate to Drain “Miller” Charge  
V

GS

= 0
 
V to 10 V  
Q1  
nC  
nC  
nC  
nC  
V

DD

= 13
V
,  
Q1  
Q2  
9
27  
13  
38  
Q

g  

V

GS

= 0
 
V to 4.5 V  
I

D

= 15 A  
Q1  
Q2  
3.9  
11  
Q2  
V

DD

= 13
V
,  
Q

gs  

Q

gd  

Q1  
Q2  
2.4  
5.8  
I

D

= 30 A  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
2

Electrical Characteristics
T

J

= 25 °C unless otherwise noted  
Symbol  
Parameter  
Test Conditions  
Type  
Min  
Typ  
Max  
Units  
Drain-Source Diode Characteristics  
V
V

GS

= 0 V, I

S

= 15 A  

GS

= 0 V, I

S

= 30 A  
(Note 2)
 
Q1  
(Note 2)
 
Q2  
0.8  
0.8  
1.2  
1.2  
V

SD  

t

rr  

Source to Drain Diode
 
Forward Voltage  
Reverse Recovery Time  
V
Q1  
Q2  
21  
32  
34  
51  
Q1  
ns  
nC  
I

F

= 15 A, di/dt = 100 A/
μ
s  
Q2  
I

F

= 30 A, di/dt = 300 A/
μ
s  
Q1  
Q2  
6.6  
36  
13  
58  
Q

rr  

Reverse Recovery Charge  
Notes:  
2
1:
R  
is determined with the device mounted on a 1 in
 
pad 2 oz copper pad on a 1.5 x 1.5 in. board of FR-4 material. R  
is guaranteed by design while R
 
is determined  
θ
CA  
θ
JA  
θ
JC  
by the user’s board design.  
b. 50 °C/W when mounted on  
a 1 in
 
pad of
 
2 oz
 
copper  
a. 57 °C/W when mounted on  
a 1 in
 
pad of
 
2 oz
 
copper  
2
2
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
μ
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.  
o
4:
E of
 
50 mJ is based on starting T
 
= 25
 
C; N-ch: L = 1 mH, I
 
= 10 A, V
 
= 23 V, V
 
= 10 V. 100% test at L=0.3
 
mH, I
 
= 15 A.  
AS  
J
AS  
DD  
GS  
AS  
o
5:
E of
 
200 mJ is based on starting T
 
= 25
 
C; N-ch: L = 1 mH, I
 
= 20 A, V
 
= 23 V, V
 
= 10 V. 100% test at L=0.3
 
mH, I
 
= 30 A.  
AS  
J
AS  
DD  
GS  
AS  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
3

Typical Characteristics (Q1 N-Channel)
T

J

= 25 °C unless otherwise noted  
40  
30  
20  
10  
0
6
5
4
3
2
1
0
PULSE DURATION = 80
μ
s  
DUTY CYCLE = 0.5% MAX  
V

GS

= 10 V  
V

GS

= 4.5
 
V  
V

GS

= 3 V  
V

GS

= 4
 
V  
V

GS

= 3.5 V  
V

GS

= 3.5 V  
V

GS

= 4.5 V  
V

GS

= 4 V  
PULSE DURATION = 80
μ
s  
DUTY CYCLE = 0.5% MAX  
V
= 3 V  
GS  
V

GS

= 10 V  
0
10  
20  
30  
40  
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 1.
 
On Region Characteristics  
F i g u r e 2 .
 
No rma li zed O n-Re si stan ce  
vs Drain Current and Gate Voltage  
1.6  
25  
I

D

= 15 A  
PULSE DURATION = 80
μ
s  
DUTY CYCLE = 0.5% MAX  
20  
V

GS

= 10 V  
1.4  
1.2  
1.0  
0.8  
0.6  
I

D

= 15 A  
15  
T

J

= 125

o

C  
10  
5
T

J

= 25

o  

C
0
-75 -50 -25  
0
25 50 75
 
100 125 150  
2
4
6
8
10  
T

J

,
JUNCTION TEMPERATURE
(

o

C
)  
V

GS

,
GATE TO SOURCE VOLTAGE (V)  
Figure 3. Normalized On Resistance  
vs Junction Temperature  
Figur
e
4
. On-Resistance
 
vs Gate to  
Source Voltage  
40  
40  
V

GS

= 0 V  
PULSE DURATION = 80
μ
s  
DUTY CYCLE = 0.5% MAX  
10  
30  
20  
10  
0
T

J

= 150

o  

C
T

J

= 25

o

C  
V

DS

= 5 V  
1
T

J

= 150

o  

C
T

J

= -55

o  

C
0.1  
T

J

= 25

o  

C
0.01  
0.001  
T

J

= -55

o  

C
1
2
3
4
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 5.
 
Transfer Characteristics  
Figur
e
6
. Source
 
to Drain Diode  
Forward Voltage vs Source Current  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
4

Typical Characteristics (Q1 N-Channel)
T

J

= 25 °C unless otherwise noted  
10  
8
2000  
1000  
V

DD

= 10 V  
I

D

= 15 A  
C

iss  

V

DD

= 13 V  
C

oss  

6
V

DD

=
16 V  
100  
4
C

rss  

2
f = 1 MHz  

GS

= 0 V  
V
0
10  
0
5
10  
Q

g

, GATE CHARGE (nC)  
15  
20  
0.1  
1
10  
25  
V

DS

, DRAIN TO SOURCE VOLTAGE (V)  
Figure 7.
 
Gate Charge Characteristics  
Figur
e
8
. C
 
a p a c i t a n c e v s D r a i n  
to Source Voltage  
20  
80  
60  
40  
20  
0
R

θ
JC

= 3.5

o

C/W  
10  
V

GS

= 10 V  
T

J

= 25

o

C  
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  
25  
50  
75  
100  
125  
150  
T

C

,
CASE TEMPERATURE
(

o

C
)  
t

AV

, TIME IN AVALANCHE (ms)  
Figur
e
9. U
 
n c l a m p e d I n d u c t i v e  
Switching Capability  
Figure 10.
 
Maximum Continuous Drain  
Current vs
 
Case Temperature  
100  
10  
1000  
SINGLE PULSE  
R

θ
JA

= 125

o

C/W  
100
μ
s  
T

A

= 25

o

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

J

= MAX RATED  
0.1  
R

θ
JA

= 125

o

C/W  

A

= 25

o

C  
DC  
1
T
0.01  
0.01  
0.5  
10

-4  

10

-3  

10

-2  

t, PULSE WIDTH (sec)  
10

-1  

1
10  
100 1000  
0.1  
1
10  
100  
200  
V

DS

, DRAIN to SOURCE VOLTAGE (V)  
Figure 11.
 
Forward Bias Safe  
Operating Area  
Figur
e
1
2. Single Pulse Maximum  
Power Dissipation  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
5

Typical Characteristics (Q1 N-Channel)
T

J

= 25 °C unless otherwise noted  
2
DUTY CYCLE-DESCENDING ORDER  
1
D = 0.5  
0.2  
0.1  
0.01  
0.1  
P
DM  
0.05  
0.02  
0.01  
t
1
t
2
SINGLE PULSE  

θ
JA

= 125

o

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

-4  

10

-3  

10

-2  

10

-1  

1
10  
100  
1000  
t, RECTANGULAR PULSE DURATION (sec)  
Figure 13.
 
Junction-to-Ambient Transient Thermal Response Curve  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
6

Typical Characteristics (Q2 N-Channel)
T

J

= 25
 

o

C unlenss otherwise noted  
100  
80  
60  
40  
20  
0
4
3
2
1
0
V

GS

= 10 V  
V

GS

= 4.5
 
V  
V

GS

= 4
 
V  
V

GS

= 3 V  
V

GS

= 4.5 V  
V

GS

= 4 V  
V

GS

= 3.5 V  
V
= 3.5 V  
GS  
V

GS

= 3 V  
V

GS

= 10 V  
PULSE DURATION = 80
μ
s  
DUTY CYCLE = 0.5% MAX  
PULSE DURATION = 80
μ
s  
DUTY CYCLE = 0.5% MAX  
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 14. On-Region Characteristics  
Figure 15. Normalized on-Resistance vs Drain  
Current and Gate
 
Voltage  
1.6  
8
I

D

= 30 A  
PULSE DURATION = 80
μ
s  
DUTY CYCLE = 0.5% MAX  
V

GS

= 10 V  
1.4  
1.2  
1.0  
0.8  
6
I

D

= 30 A  
4
T

J

= 125

o

C  
2
T

J

= 25

o  

C
0
2
4
6
8
10  
-75 -50 -25  
0
25 50 75
 
100 125 150  
T

J

,
JUNCTION TEMPERATURE
(

o

C
)  
V

GS

,
GATE TO SOURCE VOLTAGE (V)  
Figure 17. On-Resistance vs Gate to  
Source Voltage  
Figure 16. Normalized On-Resistance  
vs Junction Temperature  
100  
200  
100  
PULSE DURATION = 80
μ
s  
DUTY CYCLE = 0.5% MAX  
V

GS

= 0 V  
80  
60  
40  
20  
0
V

DS

= 5 V  
T

J

= 125

o  

C
T

J

= 125

o  

C
10  
1
T

J

= 25

o  

C
T

J

= 25

o

C  
T

J

= -55

o  

C
T

J

= -55

o  

C
0.1  
1.0  
1.5  
2.0  
2.5  
3.0  
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  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
7

Typical Characteristics (Q2 N-Channel)
T

J

= 25

o

C unless otherwise noted  
10  
10000  
1000  
100  
I

D

= 30 A  
C

iss  

8
V

DD

= 10 V  
C

oss  

6
V

DD

= 13 V  
4
C

rss  

V

DD

=
16 V  
2
f = 1 MHz  
V

GS

= 0 V  
0
10  
25  
0.1  
1
10  
0
10  
20  
30  
40  
50  
60  
V

DS

, DRAIN TO SOURCE VOLTAGE (V)  
Q ,
 
GATE CHARGE (nC)  
g
Figure 21. Capacitance vs Drain  
to Source Voltage  
Figure 20. Gate Charge Characteristics  
40  
200  
150  
100  
50  
R

θ
JC

= 2

o

C/W  
T

J

= 25

o

C  
V

GS

= 10 V  
10  
T

J

= 100

o

C  
V

GS

= 4.5 V  
T

J

= 125

o  

C
Limited by Package  
1
0.01  
0
0.1  
1
10  
100 300  
25  
50  
75  
100  
125  
150  
T

C

,
CASE TEMPERATURE
(

o

C
)  
t

AV

, TIME IN AVALANCHE (ms)  
Figure 22. Unclamped
 
Inductive  
Switching Capability  
Figure 23.Maximun Continuous Drain  
Current vs Case Temperature  
200  
10000  
100  
SINGLE PULSE  
R

θ
JA

= 120

o

C/W  
T

A

= 25

o

C  
1000  
100  
10  
1 ms  
10  
10 ms  
THIS AREA IS  
LIMITED BY r  
100 ms  
1
DS
(
on
)  
1s  
SINGLE PULSE  
T

J

= MAX RATED  
R

θ
JA

= 120

o

C/W  
T

A

= 25

o

C  
10s  
DC  
0.1  
0.01  
1
10

-4  

10

-3  

10

-2  

t, PULSE WIDTH (sec)  
10

-1  

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  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
8

Typical Characteristics (Q2 N-Channel)
T

J

= 25

o

C unless otherwise noted  
2
DUTY CYCLE-DESCENDING ORDER  
1
D = 0.5  
0.2  
0.1  
0.1  
P
DM  
0.05  
0.02  
0.01  
0.01  
0.001  
t
1
t
2
SINGLE PULSE  
R

θ
JA

= 120

o

C/W  
(Note 1d)  
NOTES:  
DUTY FACTOR: D = t
 
/t  
1
2
PEAK T
 
= P  
J
x Z  
x R  
+ T  
DM  
θ
JA  
θ
JA
A  
0.0001  
10

-4  

10

-3  

10

-2  

10

-1  

1
10  
100  
1000  
t, RECTANGULAR PULSE DURATION (sec)  
Figure26. Junction-to-Ambient
 
Transient Thermal Response Curve  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
9

Typical Characteristics
(continued)  
SyncFET Schottky body diode  
Characteristics  
Schottky barrier diodes exhibit significant leakage at high tem-  
perature and high reverse voltage. This will increase the power  
in the device.  
Fairchild’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. Figure 27 shows the reverse recovery  
characteristic of the FDMS3600S.  
10

-2  

35  
30  
25  
20  
15  
10  
5
T

J

= 125

o  

C
10

-3  

10

-4  

10

-5  

10

-6  

T

J

= 100

o  

C
didt = 300 A/
μ
s  
T

J

= 25

o  

C
0
-5  
0
5
10  
15  
20  
25  
0
50  
100  
150  
200  
250  
300  
V

DS

, REVERSE VOLTAGE (V)  
TIME (ns)  
Figure 27. FDMS3600S SyncFET body  
diode reverse recovery characteristic  
Figure 28. SyncFET body diode reverse  
leakage versus
 
drain-source voltage  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
10  

Application Information  
1. Switch Node Ringing Suppression  
Fairchild’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 29, the Power Stage  
solution rings significantly less than competitor solutions under the same set of test conditions.  
Power Stage Device  
Competitors solution  
Figure 29.
 
Power Stage phase node rising edge, High Side Turn on  
*Patent Pending  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
11  

Figure 30.
 
Shows the Power Stage in a buck converter topology  
2. 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. A recommended layout proce-  
dure is discussed below to maximize the electrical and thermal performance of the part.  
Figure 31.
 
Recommended PCB Layout  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
12  

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 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.  
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 31) 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 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.  
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.  
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.  
©2011 Fairchild Semiconductor Corporation  
FDMS3600S Rev.C3  
13  

4.00  
C
L
5.10  
4.90  
0.10 C  
A
1.27 TYP  
0.65 TYP  
(2X)  
PKG  
B
C
L
8
5
8
6
7
5
0.63  
2.15  
2.52  
1.60  
KEEP OUT AREA  
6.25  
5.90  
C
PKG  
C
L
0.00  
L
4.16  
1.21  
2.13  
2.31  
3.15  
1
4
0.10 C  
(2X)  
2
4
1
3
PIN # 1  
INDICATOR  
0.63  
0.59  
TOP VIEW  
3.18  
5.10  
SEE  
DETAIL A  
RECOMMENDED LAND PATTERN  
FOR SAWN / PUNCHED TYPE  
SIDE VIEW  
0.10  
0.05  
C A B  
C
0.10 C  
3.16  
2.80  
0.65  
0.38  
0.70  
0.36  
8X  
0.45  
0.25  
(6X)  
0.08 C  
1.34  
1.12  
C
0.05  
0.00  
1
2
3
0.35  
0.15  
4
1.10  
0.90  
SEATING  
PLANE  
0.66±.05  
(SCALE: 2X)  
2.25  
2.05  
4.08  
3.70  
1.02  
0.82  
0.65  
0.38  
8
7
6
5
0.44  
0.24  
0.61  
0.31

(8X)  

1.27  
3.81  
BOTTOM VIEW  

5.10  
4.90  
0.10 C  
(2X)  
SEE  
0.35  
0.15  
PKG  
DETAIL B  
C
L
5
8
0.28  
0.08  
10°  
6.25  
5.90  
5.90  
5.70  
PKG  
C
L
(SCALE: 2X)  
0.10 C  
1
4
(2X)  
0.41  
0.21  
(8X)  
TOP VIEW  
5.00  
4.80  
SEE  
0.10 C  
0.08 C  
DETAIL C  
0.35  
0.15  
8X  
C
SIDE VIEW  
SEATING  
PLANE  
1.10  
0.90  
(SCALE: 2X)  
0.10  
0.05  
C A B  
3.16  
2.80  
0.70  
0.36  
0.65  
0.38  
C
0.45  
0.25  
(6X)  
1
2
3
1.34  
1.12  
4
NOTES: UNLESS OTHERWISE SPECIFIED  
A) PACKAGE STANDARD REFERENCE:  
0.66±.05  
JEDEC REGISTRATION, MO-240, VARIATION AA.  
B) ALL
 
DIMENSIONS ARE IN MILLIMETERS.  
C) DIMENSIONS
 
DO NOT INCLUDE BURRS OR  
MOLD FLASH. MOLD FLASH OR BURRS DOES  
NOT EXCEED 0.10MM.  
2.25  
2.05  
4.08  
3.70  
D) DIMENSIONING
 
AND TOLERANCING PER  
ASME Y14.5M-1994.  
E) IT
 
IS RECOMMENDED TO HAVE NO TRACES  
OR VIAS WITHIN THE KEEP OUT AREA.  
F) DRAWING
 
FILE NAME: PQFN08EREV6.  
G) FAIRCHILD SEMICONDUCTOR  
1.02  
0.82  
0.65  
0.38  
6
8
7
5
0.61  
0.44  
0.24  
(8X)  
0.31  
1.27  
3.81  
BOTTOM VIEW  

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 owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent  
coverage may be accessed at

. 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.  
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,  
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or  
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer  
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not  
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification  
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized  
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and  
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such  
claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This  
literature is subject to all applicable copyright laws and is not for resale in any manner.  
PUBLICATION ORDERING INFORMATION  
LITERATURE FULFILLMEN
T
:  
N. American Technical Support
: 800
−
282
−
9855
T
o
ll Free  
USA/Canada  
Europe, Middle East and Africa Technical Support:  
Phone: 421 33 790 2910  
Japan Customer Focus Center  
Phone: 81
−
3
−
5817
−
1050  
ON Semiconductor Website
:

Literature Distribution Center for ON Semiconductor  
19521 E. 32nd Pkwy, Aurora, Colorado 80011 USA  
Phone
: 303
−
675
−
2175 or 800
−
344
−
3860
T
o
ll Free USA/Canada  
Fax
: 303
−
675
−
2176 or 800
−
344
−
3867
T
o
ll Free USA/Canada  
Email
: orderlit@onsemi.com  
For additional information, please contact your local  
Sales Representative  
©
Semiconductor Components Industries, LLC