LM3557 Datasheet | National Semiconductor

LM3557 Step-Up Converter for White LED Applications November 2004 LM3557 Step-Up Converter for White LED Applications General Description The LM3557 is a plete solution for white LED drive applications. With minimal external ponent count, no DC current leakage paths to ground, cycle-by-cycle current limit protection, and output over-voltage protection circuitry, the LM3557 offer superior performance and cost savings over standard DC/DC boost ponent implementations. The LM3557 switches at a fixed-frequency of 1.25 MHz, which allows for the use of small external ponents. Also, the LM3557 has a wide input voltage range to take advantage of multi-cell input applications. With...