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LM3557 Datasheet Step-Up Converter

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: LM3557 Step-Up Converter for White LED Applications November 2004 LM3557 Step-Up Converter for White LED.

Download the LM3557 datasheet PDF. This datasheet also includes the LM3 variant, as both parts are published together in a single manufacturer document.

General Description

The LM3557 is a complete solution for white LED drive applications.

With minimal external component 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 component implementations.

The LM3557 switches at a fixed-frequency of 1.25 MHz, which allows for the use of small external components.

Key Features

  • n VIN Range: 2.7V.
  • 7.5V n Small External Components Typical.