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User's Guide
SNVA063H–April 2003–Revised April 2013
AN-1274 LM2623 Evaluation Board
1 Introduction
The LM2623 is a general purpose, gated oscillator based, DC/DC boost converter that can run from low
input voltage and produce a regulated output voltage with low ripple. The LM2623 evaluation board is
programmed for a 5V output running off a two-cell power supply. For more information regarding the
LM2623, please refer to LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter
(SNVS188), AN-1258 LM2623 Boost Converter - A Simple Supply (SNVA061), and AN-1221 LM2623
General Purpose, Boost Converter Circuit (SNVA050) for more application configurations.
2 Bill of Materials
Table 1. Bill of Materials
Designator Description Manufacturer Model Number
U1 LM2623 DC-DC Converter VSSOP-8 Texas Instruments LM2623
L1 Inductor (4.7µH 20% 2A) Coilcraft DO1813P-472HC
C1 Input Capacitor (220µF Tantalum Vishay - Sprague 595D227X06R3C2
Capacitor ( 20% 6.3V ))
C2 Output Capacitor (100µF Tantalum Vishay - Sprague 293D107X96R3C2T
Capacitor (10%, 6.3V))
D1 Output Diode (40V 3A Schottky) OnSemi MBRS340T3
RF2 100 kΩ Feedback Resistor Vishay - Dale CRCW06031003F
RF1 300 kΩ Feedback Resistor Vishay - Dale CRCW06033003F
R3 150 kΩ Frequency Set Resistor Vishay - Dale CRCW06031503F
R5 0Ω Resistor Vishay - Dale CRCW0603000F
C3 4.7pF Ceramic Capacitor TDK C1608C0G1H4R7C
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SNVA063H–April 2003–Revised April 2013 AN-1274 LM2623 Evaluation Board
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