Symbol
V
DS
V
GS
I
DM
T
J
, T
STG
Symbol
Typ
Max
50
62.5
82
110
R
JL
41
50
Maximum Junction-to-Lead
C
Steady-State
C/W
Parameter
Units
Maximum Junction-to-Ambient
A
t 10s
R
JA
C/W
Maximum Junction-to-Ambient
A
Steady-State
C/W
Junction and Storage Temperature Range
-55 to 150
C
Thermal Characteristics
T
A
=70C
1.44
W
Power Dissipation
T
A
=25C
P
D
2
A
T
A
=70C
5.8
Pulsed Drain Current
B
30
Continuous Drain
Current
A
T
A
=25C
I
D
6.9
Drain-Source Voltage
30
V
Gate-Source Voltage
20
V
Absolute Maximum Ratings T
A
=25C unless otherwise noted
Parameter
Maximum
Units
AO4812A
Dual N-Channel Enhancement Mode Field Effect Transistor
Features
V
DS
(V) = 30V
I
D
= 6.9A (V
GS
= 10V)
R
DS(ON)
< 28m
(V
GS
= 10V)
R
DS(ON)
< 42m
(V
GS
= 4.5V)
General Description
The AO4812A uses advanced trench technology to
provide excellent R
DS(ON)
and low gate charge. The
two MOSFETs make a compact and efficient switch
and synchronous rectifier combination for use in buck
converters.
AO4812A is Pb-free (meets ROHS &
Sony 259 specifications). AO4812AL is a Green
Product ordering option. AO4812A and AO4812AL
are electrically identical.
G1
S1
G2
S2
D1
D1
D2
D2
1
2
3
4
8
7
6
5
G1
D1
S1
G2
D2
S2
SOIC-8
Alpha & Omega Semiconductor, Ltd.
AO4812A
Symbol
Min
Typ
Max
Units
BV
DSS
30
V
0.004
1
T
J
=55C
5
I
GSS
100
nA
V
GS(th)
1
1.8
3
V
I
D(ON)
20
A
19
28
T
J
=125C
24
30
28
42
m
g
FS
10
24
S
V
SD
0.77
1
V
I
S
4.3
A
C
iss
621
820
pF
C
oss
118
pF
C
rss
85
pF
R
g
0.8
1.5
Q
g
(10V)
11.3
17
nC
Q
g
(4.5V)
5.7
8
nC
Q
gs
2.1
nC
Q
gd
3
nC
t
D(on)
4.5
6.5
ns
t
r
3.1
5
ns
t
D(off)
15.1
23
ns
t
f
2.7
5
ns
t
rr
15.5
20
ns
Q
rr
7.1
10
nC
THIS PRODUCT HAS BEEN DESIGNED AND QUALIFIED FOR THE CONSUMER MARKET. APPLICATIONS OR USES AS CRITICAL
COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS ARE NOT AUTHORIZED. AOS DOES NOT ASSUME ANY LIABILITY ARISING
OUT OF SUCH APPLICATIONS OR USES OF ITS PRODUCTS. AOS RESERVES THE RIGHT TO IMPROVE PRODUCT DESIGN,
FUNCTIONS AND RELIABILITY WITHOUT NOTICE.
Body Diode Reverse Recovery Time
Body Diode Reverse Recovery Charge I
F
=6.9A, dI/dt=100A/
s
Drain-Source Breakdown Voltage
On state drain current
I
D
=250
A, V
GS
=0V
V
GS
=4.5V, V
DS
=5V
V
GS
=10V, I
D
=6.9A
Reverse Transfer Capacitance
I
F
=6.9A, dI/dt=100A/
s
Electrical Characteristics (T
J
=25C unless otherwise noted)
STATIC PARAMETERS
Parameter
Conditions
I
DSS
A
Gate Threshold Voltage
V
DS
=V
GS
I
D
=250
A
V
DS
=24V, V
GS
=0V
V
DS
=0V, V
GS
= 20V
Zero Gate Voltage Drain Current
Gate-Body leakage current
R
DS(ON)
Static Drain-Source On-Resistance
Forward Transconductance
Diode Forward Voltage
m
V
GS
=4.5V, I
D
=5A
I
S
=1A,V
GS
=0V
V
DS
=5V, I
D
=6.9A
Total Gate Charge
Gate Source Charge
Gate resistance
V
GS
=0V, V
DS
=0V, f=1MHz
Turn-On Rise Time
Turn-Off DelayTime
V
GS
=10V, V
DS
=15V, R
L
=2.2
,
R
GEN
=3
Turn-Off Fall Time
Maximum Body-Diode Continuous Current
Input Capacitance
Output Capacitance
Turn-On DelayTime
DYNAMIC PARAMETERS
V
GS
=10V, V
DS
=15V, I
D
=6.9A
Total Gate Charge
Gate Drain Charge
V
GS
=0V, V
DS
=15V, f=1MHz
SWITCHING PARAMETERS
A: The value of R
JA
is measured with the device mounted on 1in
2
FR-4 board with 2oz. Copper, in a still air environment with T
A
=25C. The value in
any given application depends on the user's specific board design. The current rating is based on the t 10s thermal resistance rating.
B: Repetitive rating, pulse width limited by junction temperature.
C. The R
JA
is the sum of the thermal impedence from junction to lead R
JL
and lead to ambient.
D. The static characteristics in Figures 1 to 6 are obtained using 80
s pulses, duty cycle 0.5% max.
E. These tests are performed with the device mounted on 1 in
2
FR-4 board with 2oz. Copper, in a still air environment with T
A
=25C. The SOA curve
provides a single pulse rating.
Rev 0: December 2005
Alpha & Omega Semiconductor, Ltd.
AO4812A
TYPICAL ELECTRICAL AND THERMAL CHARACTERISTICS
V
GS
=10V, V
DS
=15V, I
D
=7.4A
V
GS
=10V, V
DS
=15V, R
L
=2.0
, R
GEN
=3
I
F
=7.4A, dI/dt=100A/
s
I
F
=7.4A, dI/dt=100A/
s
THIS PRODUCT HAS BEEN DESIGNED AND QUALIFIED FOR THE CONSUMER MARKET. APPLICATIONS OR USES AS CRITICAL
COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS ARE NOT AUTHORIZED. AOS DOES NOT ASSUME ANY LIABILITY ARISING
OUT OF SUCH APPLICATIONS OR USES OF ITS PRODUCTS. AOS RESERVES THE RIGHT TO IMPROVE PRODUCT DESIGN,
FUNCTIONS AND RELIABILITY WITHOUT NOTICE.
0
5
10
15
20
25
30
0
1
2
3
4
5
V
DS
(Volts)
Fig 1: On-Region Characteristics
I
D
(A
)
V
GS
=3V
3.5V
4V
4.5V
10V
0
4
8
12
16
20
1.5
2
2.5
3
3.5
4
4.5
V
GS
(Volts)
Figure 2: Transfer Characteristics
I
D
(A
)
15
20
25
30
35
0
5
10
15
20
I
D
(A)
Figure 3: On-Resistance vs. Drain Current and Gate
Voltage
R
DS
(
O
N)
(m
)
1.0E-05
1.0E-04
1.0E-03
1.0E-02
1.0E-01
1.0E+00
1.0E+01
0.0
0.2
0.4
0.6
0.8
1.0
V
SD
(Volts)
Figure 6: Body-Diode Characteristics
I
S
(A
)
25C
125C
0.6
0.8
1
1.2
1.4
1.6
-50
-25
0
25
50
75
100 125 150 175
Temperature (C)
Figure 4: On-Resistance vs. Junction Temperature
No
rmal
i
z
ed
O
n
-
R
esi
st
an
ce
V
GS
=10V
V
GS
=4.5V
I
D
=6.9A
10
20
30
40
50
60
2
4
6
8
10
V
GS
(Volts)
Figure 5: On-Resistance vs. Gate-Source Voltage
R
DS
(
O
N)
(m
)
25C
125C
V
DS
=5V
V
GS
=4.5V
V
GS
=10V
I
D
=6.9A
25C
125C
5V
6V
Alpha & Omega Semiconductor, Ltd.
AO4812A
TYPICAL ELECTRICAL AND THERMAL CHARACTERISTICS
V
GS
=10V, V
DS
=15V, I
D
=7.4A
V
GS
=10V, V
DS
=15V, R
L
=2.0
, R
GEN
=3
I
F
=7.4A, dI/dt=100A/
s
I
F
=7.4A, dI/dt=100A/
s
THIS PRODUCT HAS BEEN DESIGNED AND QUALIFIED FOR THE CONSUMER MARKET. APPLICATIONS OR USES AS CRITICAL
COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS ARE NOT AUTHORIZED. AOS DOES NOT ASSUME ANY LIABILITY ARISING
OUT OF SUCH APPLICATIONS OR USES OF ITS PRODUCTS. AOS RESERVES THE RIGHT TO IMPROVE PRODUCT DESIGN,
FUNCTIONS AND RELIABILITY WITHOUT NOTICE.
0
2
4
6
8
10
0
2
4
6
8
10
12
Q
g
(nC)
Figure 7: Gate-Charge Characteristics
V
GS
(Vo
l
ts
)
0
200
400
600
800
1000
0
5
10
15
20
25
30
V
DS
(Volts)
Figure 8: Capacitance Characteristics
Cap
aci
t
an
ce (
p
F
)
C
iss
0
10
20
30
40
50
0.001
0.01
0.1
1
10
100
1000
Pulse Width (s)
Figure 10: Single Pulse Power Rating Junction-to-
Ambient (Note E)
Po
w
e
r
(W
)
0.01
0.1
1
10
0.00001
0.0001
0.001
0.01
0.1
1
10
100
1000
Pulse Width (s)
Figure 11: Normalized Maximum Transient Thermal Impedance
Z
JA
No
rmal
i
z
ed
T
ran
si
en
t
T
h
ermal
Resi
st
an
ce
C
oss
C
rss
0.1
1.0
10.0
100.0
0.1
1
10
100
V
DS
(Volts)
I
D
(A
m
p
s
)
Figure 9: Maximum Forward Biased Safe
Operating Area (Note E)
100
s
10ms
1ms
0.1s
1s
10s
DC
R
DS(ON)
limited
T
J(Max)
=150C
T
A
=25C
V
DS
=15V
I
D
=6.9A
Single Pulse
D=T
on
/T
T
J,PK
=T
A
+P
DM
.Z
JA
.R
JA
R
JA
=62.5C/W
T
on
T
P
D
In descending order
D=0.5, 0.3, 0.1, 0.05, 0.02, 0.01, single pulse
T
J(Max)
=150C
T
A
=25C
10
s
Alpha & Omega Semiconductor, Ltd.
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