IR3842WMTR1PBF International Rectifier, IR3842WMTR1PBF Datasheet - Page 23

• Manufacturer Part Number: IR3842WMTR1PBF
• Description: IC REG SYNC BUCK 4A 15-QFN
• Manufacturer: International Rectifier
• Series: SupIRBuck™r
• Type: Step-Down (Buck)r

Specifications of IR3842WMTR1PBF

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.7 ~ 14.4 V
• Current - Output: 4A
• 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: 640mW
• Primary Input Voltage: 16V
• No. Of Outputs: 1
• Output Voltage: 14.4V
• Output Current: 4A
• No. Of Pins: 15
• Operating Temperature Range: -40°C To +125°C
• Output Voltage Adjustable Max, Vout: 14.4V
• Rohs Compliant: Yes
• Part Status: Preferred
• Package: PQFN / 5 x 6
• Circuit: Single Output
• Iout (a): 4
• 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: IR3842WMTR1PBFTR

Detailed calculation of compensation TypeIII
Rev 11.0
Desired
F
F
Select
F
Select
Calculate
R
Select
C
C
Calculate
R
R
Select
R
P
P
Z
3
10
3
4
8
9
2
2
3
=
=
=
=
=
=
=
=
=
2
V
2
2
2
F
0.5
F
2
π
π
π
π
:
:
:
:
o
π
o
o
V
C
R
F
R
*
*
*
*
-
ref
7
*
Z
8
*
V
F
C
F
3
F
1
1
Phase
1
1
1
1
C
F
1
P
ref
=
o
Z
1
=
R
=
R
−
+
7
+
−
1
=
s
1
3
7
C
*
10
2.2
3
*
3.92
sin
sin
sin
sin
3.09
*
*
*
0
,
=
*
L
7
F
,
.
R
R
F
C
R
o
5
Z
300
*
R
P
nF
3
2
Θ
Θ
V
Θ
Θ
3
3
8
*
*
2
8
;
;
k
C
;
F
in
k
-
R
C
;
Margin
and
C
Ω
Ω
=
=
Z
R
and
o
9
3
2
4
kHz
R
17.63
10
567.1
*
=
=
=
=
10
V
;
171.69
C
2.49
osc
. 5
R
8.82
R
=
4
8
84
9
128
:
;
Θ
=
kHz
kHz
R
:
k
nF,
3.97
3
=
Ω
kHz
Ω
=
pF
70
,
3.08
Select
,
o
Select
k
Select
and
Ω
Select
,
k
Ω
:
:
R
:
C
R
:
9
C
4
10
=
3
=
2.49
=
=
5.6
130
150
nF
k
Ω
Ω
pF
Setting the Power Good Threshold
A window comparator internally sets a lower
Power Good threshold at 0.595V and an upper
Power Good threshold at 0.805V. 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
SET
R
I
(50%
I
R
OCSet
SET
=
R
DS
OCSet
I
DS(on)
L
(
on
(
≅
critical
)
=
I
over
=
o
=
59.07
(
LIM
1.82
14.3
)
=
)
has
R
=
nominal
IR3842WMPbF
k
μA
OCSet
m
4
Ω
R
Ω
A
DS
*
Select
a
*
(at
The value of the pull-up
∗
1.25
1.5
(
on
OCSET
I
OCSet
F
)
positive
output
s
=
=
6
=
17.87
R
) from the SW pin
A
600
..........
7
=
current
kHz)
1.82
m
temperature
..........
Ω
OCSET
k
Ω
PG
)
...
must
(32)
23
from