EN
BOOST
SW
FB
GND
V
OUT
L1
R1
R2
D1
D2
D3
R3
C1
R5
R4
GND
GND
C4
C3
C2
V
IN
V
IN
V
EN
User's Guide
SNVA135A – October 2005 – Revised April 2013
AN-1418 LM2736 Evaluation Board
1
Introduction
The LM2736 demo board is configured to convert 5V input to 1.5V output at 750 mA load current using
the LM2736X 1.6 MHz or the LM2736Y 550 kHz step down DC-DC regulator. The tiny low profile thin
SOT23 package allows the demo board to be manufactured using less than 1 square inch of a 4-layer
printed circuit board.
The circuit is configured with the boost diode connected to V
IN
, and according to the datasheet, V
IN
must
not exceed the maximum operating limit of 5.5V + V
fD2
using this configuration. This will ensure that the
voltage between the Boost and SW pins, V
BOOST
- V
SW
, does not exceed 5.5V for proper operation. For
more information regarding this requirement, see the LM2736 Thin SOT 750mA Load Step-Down DC-DC
Regulator Data Sheet (
SNVS316
).
A bill of materials below describes the parts used on this demo board. A schematic and layout have also
been included below along with measured performance characteristics. The schematics at the end of this
document show how to re-configure this demo board for various input and output conditions as discussed
in the LM2736 datasheet. Short or leave open the indicated connection as indicated in the schematics.
The above restrictions for the input voltage are valid only for the demo board as shipped with the demo
board schematic below.
2
Operating Conditions
V
IN
= 5V
V
O
= 1.5V
I
O
= 750 mA
Figure 1. LM2736 Demo Board Schematic
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1
SNVA135A – October 2005 – Revised April 2013
AN-1418 LM2736 Evaluation Board
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