LM2735XSDEVAL National Semiconductor, LM2735XSDEVAL Datasheet - Page 13

• Manufacturer Part Number: LM2735XSDEVAL
• Description: BOARD EVAL LM2735 1.6MHZ 6LLP
• Manufacturer: National Semiconductor

Specifications of LM2735XSDEVAL

• Main Purpose: DC/DC, Step Up
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 12V
• Current - Output: 500mA
• Voltage - Input: 3 ~ 5.5V
• Regulator Topology: Boost
• Frequency - Switching: 1.6MHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM2735
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

and V
sible. However, making the traces wide increases radiated
noise, so the designer must make this trade-off. Radiated
noise can be decreased by choosing a shielded inductor. The
remaining components should also be placed as close as
possible to the IC. Please see Application Note AN-1229 for
further considerations and the LM2735 demo board as an ex-
ample of a four-layer layout.
Below is an example of a good thermal & electrical PCB de-
sign. This is very similar to our LM2735 demonstration boards
OUT
traces, so they should be as short and wide as pos-
13
that are obtainable via the National Semiconductor website.
The demonstration board consists of a two layer PCB with a
common input and output voltage application. Most of the
routing is on the top layer, with the bottom layer consisting of
a large ground plane. The placement of the external compo-
nents satisfies the electrical considerations, and the thermal
performance has been improved by adding thermal vias and
a top layer “Dog-Bone”.
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