APPLICATIONS
November 2004 LM3557 Step-Up Converter for White LED APPLICATIONS
GENERAL DESCRIPTION
Also, the LM3557 has a wide input voltage range to take advantage of multi-cell input applications. With small external components, high fixed frequency operation, and wide input voltage range, the LM3557 is the most optimal choice for LED lighting applications. 1.25 MHz Constant-Switching Frequency Output Over-Voltage Protection Input Under-Voltage Protection Cycle-By-Cycle Current Limit TRUE SHUTDOWN: No DC current paths to ground during shutdown n Low Profile Package: < 1 mm Height -8 Pin LLP n No External Compensation n n n n n APPLICATIONS
n White LED Display Lighting n Cellular Phones n PDAs FEATURES
n VIN Range: 2.7V–7.5V n Small External Components Typical Application Circuit 20131601 FIGURE 1. Backlight Configuration © 2004 National Semiconductor Corporation DS201316 LM3557 Connection Diagram Top View 20131602 8-Lead Thin Leadless Leadframe Package See NS Package Number SDA08A Or...
National Semiconductor
