LM2623EV

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 Capacitor ( 20% 6.3V )) Vishay - Sprague 595D227X06R3C2 C2 Output Capacitor (100µF Tantalum Capacitor (10%, 6.3V)) Vishay - Sprague 293D107X96R3C2T 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 All trademarks are the property of their respective owners. SNVA063H – April 2003 – Revised April 2013 Submit Documentation Feedback AN-1274 LM2623 Evaluation Board Copyright © 2003–2013, Texas Instruments Incorporated 1 Application Circuit 3 www.ti.com Application Circuit Within the Application Board Circuit Diagram, Figure 1, there are many components shown that are not populated on the 5V output evaluation board. These component footprints are used in numerous other applications found in application note AN-1221. In addition, jumpers J1, J2, and J4 are closed on the twocell input to 5V output application board. D1 L1 V IN 2.3V to 5.5V 4.7PH R3 150k 3A C3 C1 + 220PF tant. 4.7pF 8 SW 3 BOOT FREQ LM2623 1 EN V DD PGND FB 7 5V 2 6 C2 100PF tant RF1 300k 4 SGND 5 RF2 100k Figure 1. Evaluation Board Application Circuit 2 AN-1274 LM2623 Evaluation Board SNVA063H – April 2003 – Revised April 2013 Submit Documentation Feedback Copyright © 2003–2013, Texas Instruments Incorporated Board Layers www.ti.com 4 Board Layers Figure 2. Typical Layout, Top View Figure 3. Bottom View Unmirrored SNVA063H – April 2003 – Revised April 2013 Submit Documentation Feedback AN-1274 LM2623 Evaluation Board Copyright © 2003–2013, Texas Instruments Incorporated 3 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. 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