LM3502 - National Semiconductor

LM3502 Step-Up Converter

The LM3502 is a white LED driver for lighting applications. For dual display or large single white LED string backlighting applications, the LM3502 provides a complete solution. The LM3502 contains two internal white LED current bypass FET(Field Effect Transitor) switches that are ideal for controlling dual display applications. The white LED current can be .

Features

n Drive up to 4, 6, 8 or 10 white LEDs for Dual Display Backlighting n > 80% efficiency n Output Voltage Options: 16V , 25V , 35V, and 44V n Input Under-Voltage Protection n Internal Soft Start Eliminating Inrush Current n 1 MHz Constant Switching Frequency n Wide Input Voltage: 2.5V to 5.5V n Small External Components n Low Profile Packages: < 1 mm Height -10 Bump MicroSMD -16 Pin LLP Applications n Dual Display Backlighting in Portable Devices n Cellular Phones and PDAs Typical Application 20131701 FIGURE 1. Blacklight Configuration with 10 White LEDs © 2006 National Semiconductor Corpo.