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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
SNVA100A–February 2005–Revised April 2013
AN-1350 LM2734 Evaluation Board
1 Introduction
The LM2734 demo board is configured to convert 5V input to 1.8V output at 1A load current using the
LM2734X 1.6MHz or the LM2734Y 550kHz 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 data sheet, 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. Please
see the LM2734 data sheet for more information regarding this requirement.
A bill of materials in Table 1 and Table 2 describes the parts used on this demo board. A schematic and
layout have also been included in Figure 1 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 LM2734 data sheet. 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
= 1.8V
I
O
= 1A
Figure 1. LM2734 Demo Board Schematic
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1
SNVA100A–February 2005–Revised April 2013 AN-1350 LM2734 Evaluation Board
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