IR3840WMTR1PBF International Rectifier, IR3840WMTR1PBF Datasheet - Page 23

• Manufacturer Part Number: IR3840WMTR1PBF
• Description: IC REG SYNC BUCK 12A 15-QFN
• Manufacturer: International Rectifier
• Series: SupIRBuck™r
• Type: Step-Down (Buck)r

Specifications of IR3840WMTR1PBF

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.7 ~ 14.4 V
• Current - Output: 12A
• Frequency - Switching: 225kHz ~ 1.65MHz
• Voltage - Input: 1.5 ~ 16 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 15-PowerVQFN
• Power - Output: 2.5W
• Primary Input Voltage: 16V
• No. Of Outputs: 1
• Output Voltage: 14.4V
• Output Current: 12A
• No. Of Pins: 15
• Operating Temperature Range: -40°C To +125°C
• Output Voltage Adjustable Max, Vout: 14.4V
• Rohs Compliant: Yes
• Dc To Dc Converter Type: Step Down
• Pin Count: 15
• Input Voltage: 16V
• Switching Freq: 225 TO 1650KHz
• Package Type: Power QFN EP
• Output Type: Adjustable
• Switching Regulator: Yes
• Mounting: Surface Mount
• Input Voltage (min): 1.5V
• Operating Temperature Classification: Automotive
• Part Status: Preferred
• Package: PQFN / 5 x 6
• Circuit: Single Output
• Iout (a): 12
• Switch Freq (khz): 250 - 1500
• Input Range (v): 1.5 - 16
• Output Range (v): 0.7 - 0.9*Vin
• Ocp Otp Uvlo Pre-bias Soft Start And: PGOOD + EN + SEQ + OVD
• Design Tool: Yes
• Server Storage: Yes
• Routers Switches: Yes
• Base Station Telecom: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: IR3840WMTR1PBFTR

Detailed calculation of compensation TypeIII
Rev 9.0
C
C
Desired
F
F
Select
F
Select
Calculate
R
Select
Calculate
R
R
Select
R
Z
P
P
4
3
10
8
3
9
2
3
2
=
=
=
=
=
=
=
=
=
V
2
2
2
2
F
F
0.5
2
π
:
:
π
:
π
π
:
o
π
o
o
V
C
R
F
R
*
*
*
-
*
ref
*
7
Z
8
V
*
3
F
C
F
F
Phase
1
1
1
1
1
C
1
F
1
P
ref
=
o
Z
1
=
R
=
R
7
−
+
+
−
1
=
s
1
3
7
C
*
10
2.2
3
3.92
sin
sin
1.87
*
sin
sin
*
*
*
0
=
,
*
L
7
F
,
R
.
R
F
C
o
R
5
Z
300
*
R
nF
P
3
2
Θ
Θ
Θ
3
V
3
8
Θ
*
*
2
8
;
k
;
kΩ
F
C
in
;
-
R
Margin
and
C
;
C
Ω
=
R
=
Z
and
o
3
9
2
4
kHz
R
10
17.63
567.1
*
=
=
=
=
10
V
;
C
2.49
osc
283.7
9.65
R
8.82
R
=
4
8
9
128
:
;
kHz
kHz
Θ
=
R
:
kΩ
nF,
3.97
3
=
kHz
pF
, Ω
70
=
,
1.85
Select
o
Select
kΩ
Select
Select
and
,
kΩ
:
:
R
:
:
C
C
R
9
4
3
10
=
=
=
2.49
=
10
220
130
nF
kΩ
pF
Ω
Setting the Power Good Threshold
A window comparator internally sets a lower
Power Good threshold at 0.6V and an upper
Power Good threshold at 0.8V. When the voltage
at the FB pin is within the window set by these
thresholds, PGood is asserted.
The PGood is an open drain output. Hence, it is
necessary to use a pull up resistor R
PGood pin to Vcc.
resistor must be chosen such as to limit the
current flowing into the PGood pin, when the
output voltage is not in regulation, to less than 5
mA. A typical value used is 10kΩ.
Programming the Current-Limit
The Current-Limit threshold can be set by
connecting a resistor (R
to the OCSet pin. The resistor can be calculated
by using equation (4). This resistor R
be placed close to the IC.
The
coefficient and it should be considered for the
worst case operation.
I
I
(50%
I
R
R
SET
SET
OCSet
DS
OCSet
(
≅
on
=
=
R
)
I
=
I
( o
=
59.07
L
over
DS(on)
LIM
2.17
(
5
critical
.
)
7
=
mΩ
12
)
kΩ
μA
nominal
=
A
has
*
R
*
1.25
(at
Select
IR3840WMPbF
OCSet
1.5
R
F
DS
=
=
s
a
The value of the pull-up
18
∗
7.125
=
(
output
on
I
600
OCSET
R
OCSet
A
)
7
positive
=
kHz)
mΩ
2.15
) from the SW pin
current
..........
kΩ
..........
temperature
OCSET
)
PG
...
(32)
must
from
23