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LM273X
SW
FB
GND
V
IN
U1
R1
SHDN
V
IN
C1
R3
C3
D1
R2
L1
C2
SHDN
V
OUT
User's Guide
SNVA066B–April 2003–Revised April 2013
AN-1280 LM2731/LM2733 Evaluation Board
1 Introduction
The LM2731 and LM2733 are high frequency switching boost regulators that offer small size and high
power conversion efficiency. The "X" version of the part operates at 1.6MHz switching frequency and the
"Y" version at 600kHz. The primary difference between the LM2731 and LM2733 is that the LM2731 has a
higher current internal switch FET (with lower breakdown voltage), while the LM2733 has a higher voltage
FET that handles less current. The LM2733 targets applications with higher output voltages, while the
LM2731 is intended for applications requiring higher load currents at lower output voltages. This user's
guide will describe the evaluation board supplied to demonstrate the operation of these parts and give
information on its usage.
2 Basic Application Circuit
The basic application circuit shown in Figure 1 provides the component designators used on the
evaluation board.
Figure 1. Evaluation Board Basic Application Circuit
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SNVA066B–April 2003–Revised April 2013 AN-1280 LM2731/LM2733 Evaluation Board
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