IR3623MPBF International Rectifier, IR3623MPBF Datasheet - Page 23

• Manufacturer Part Number: IR3623MPBF
• Description: IC CTLR 2PH SYNC STEPDOWN 32MLPQ
• Manufacturer: International Rectifier
• Type: Step-Down (Buck)r

Specifications of IR3623MPBF

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 2
• Voltage - Output: Adj to 0.8V
• Current - Output: 200mA
• Frequency - Switching: 200kHz ~ 1.2MHz
• Voltage - Input: 8.5 ~ 14.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-MLPQ
• Package: 32-Lead MLPQ
• Circuit: 2 Channel or 2 Phase Sync PWM Controller
• Vcc (min): 8.5
• Vcc (max): 14.5
• Switch Freq (khz): 200kHz to 1.2MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

Programming the Current-Limit
The Current-Limit threshold can be set by
connecting a resistor (R
side MOSFET to the OCSet pin. The resistor
can be calculated by using equation (7).
The
coefficient and it should be considered for the
worse case operation. This resistor must be
placed close to the IC, place a small ceramic
capacitor from this pin to ground for noise
rejection purposes.
www.irf.com
R
I
SET
DS(on)
(50%
R
R
I
SET
=
DS
OCSet
I
(
L
on
≅
(
critical
)
over
I
=
=
o
(
has
R
2
)
LIM
3 .
3
=
nominal
=
)
m
R
=
R
Ω
OCSet
20
4
R
∗
a
=
DS
1
A
5 .
. 5
∗
(
∗
on
SET
I
output
11
positive
OCSet
=
1
)
5 .
. 3
K
) from drain of low
=
Ω
45
30
m
current)
Ω
A
-
- -
temperature
( -
) 7
Layout Consideration
The layout is very important when designing high
frequency switching converters. Layout will affect
noise pickup and can cause a good design to
perform with less than expected results.
Start to place the power components, make all
the connection in the top layer with wide, copper
filled areas. The inductor, output capacitor should
be close to each other as possible. This helps to
reduce the EMI radiated by the power traces due
to the high switching currents through them.
Place input capacitors as close as possible to the
power module’s input pin.
necessary to reduce the ESR to desired levels.
The feedback part of the system should be kept
away from the inductor and other noise sources,
and be placed close to the IC. In multilayer PCB
use one layer as power ground plane and have a
control circuit ground (analog ground), to which
all signals are referenced. The goal is to localize
the high current path to a separate loop that does
not interfere with the more sensitive analog
control function. These two grounds must be
connected together on the PC board layout at a
single point. The exposed pad of IC should be
connected to analog ground. Layout guidelines
for IP2005A can be found in the product data
sheet.
IR3623MPbF
Add capacitors as
23