LM3500TL-16EV

User's Guide SNVA081A – May 2004 – Revised April 2013 AN-1309 LM3500 Evaluation Board 1 Introduction The LM3500 is a synchronous step-up DC/DC converter designed for white LED applications. The evaluation board is set up to drive 3 standard VF white LEDs from a single Li-Ion battery. A fourth LED pad (D4) is included for testing of up to 4 low VF white LEDs. The LED current is set using the resistor R2 and the equation ILED = 0.5V/R2. The evaluation board comes set up for approximately 20 mA LED current. Please note that for correct operation the SHDN pin must have a voltage greater than 1.1V applied to it. 2 Schematic L 22 PH VIN 2.7V - 5.5V B1 VIN A3 CIN 1PF Ceramic >1.1V