isl8036 Intersil Corporation, isl8036 Datasheet - Page 24

• Manufacturer Part Number: isl8036
• Description: Dual 3a 1mhz/2.5mhz High Efficiency Synchronous Buck Regulator
• Manufacturer: Intersil Corporation

output voltage relative to the internal reference voltage
and feed it back to the inverting input of the error
amplifier. Refer to Figure 2.
The output voltage programming resistor, R
Channel 2), will depend on the desired output voltage of
the regulator. The value for the feedback resistor is
typically between 0Ω and 750kΩ. Let R
R
For better performance, add 12pF in parallel with R
the output voltage desired is 0.8V, then leave R
unpopulated and short R
Input Capacitor Selection
The main functions for the input capacitor are to provide
decoupling of the parasitic inductance and to provide
filtering function to prevent the switching current flowing
back to the battery rail. One 22µF X5R or X7R ceramic
capacitor is a good starting point for the input capacitor
selection per channel.
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information page on intersil.com: ISL8036,
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Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to
web to make sure you have the latest Rev.
R
3
3
will be:
=
10/12/10
9/28/10
DATE
----------------------------------
V
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
OUT
R
2
x0.8V
–
0.8V
For information regarding Intersil Corporation and its products, see
REVISION
FN6853.1
FN6853.0
in the quality certifications found at
2
24
.
www.intersil.com/products
For additional products, see
In Table 3 on page 3, corrected F
Initial release.
2
http://rel.intersil.com/reports/sear
= 124kΩ, then
2
ISL8036A
ISL8036, ISL8036A
(or R
3
(EQ. 3)
5
2
in
. If
for a complete list of Intersil product families.
www.intersil.com/product_tree
PCB Layout Recommendation
The PCB layout is a very important converter design step
to make sure the designed converter works well. For
ISL8036, ISL8036A, the power loop is composed of the
output inductor L’s, the output capacitor C
C
to make the power loop as small as possible and the
connecting traces among them should be direct, short
and wide. The switching node of the converter, the LX_
pins, and the traces connected to the node are very
noisy, so keep the voltage feedback trace away from
these noisy traces. The FB network should be as close as
possible to its FB pin. SGND should have one single
connection to PGND. The input capacitor should be placed
as closely as possible to the VIN pin. Also, the ground of
the input and output capacitors should be connected as
closely as possible. The heat of the IC is mainly
dissipated through the thermal pad. Maximizing the
copper area connected to the thermal pad is preferable.
In addition, a solid ground plane is helpful for better EMI
performance. It is recommended to add at least 5 vias
ground connection within the pad for the best thermal
relief.
www.intersil.com/design/quality
SW
OUT2
www.intersil.com/askourstaff
for ISL8036 from 1Hz to 1MHz.
, the LX’s pins, and the PGND pin. It is necessary
CHANGE
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OUT1
October 18, 2010
and
FN6853.1