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LM3404 Constant Current Buck Regulators, Evaluation Tools


Monolithic switching regulators from National Semiconductor


LM3404 Constant Current Buck Regulators, Evaluation ToolsNational Semiconductor's LM3404/04HV monolithic switching regulators are designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, they contain ahigh-side N-channel MOSFET switch with a current limit of 1.5A (typical) for step-down (Buck) regulators. Hysteretic controlled on-time and external resistors allow the converters’ output voltage to adjust as needed to deliver a constant current to series and series-parallel connected LED arrays of varying number and type. LED dimming via pulse width modulation (PWM), broken/open LED protection, low-power shutdown, and thermal shutdown complete the feature set.

National’s WEBENCH® Buildit Board as well as its LM3404HVEVAL/NOPB, LM3404EVAL, and LM3404MREVAL evaluation boards demonstrate the enhanced thermal performance, fast dimming, and true constant LED current capabilities of the LM3404 devices.

Features

  • Integrated 1.0A MOSFET
  • VIN range 6V to 42V (LM3404)
  • VIN range 6V to 75V (LM3404HV)
  • 1.2A output current over temperature
  • Cycle-by-cycle current limit
  • No Control Loop Compensation Required
  • Separate PWM dimming and low power shutdown
  • Supports all-ceramic output capacitors and capacitor-less outputs
  • Thermal shutdown protection
  • SO-8 package, PSOP-8 package

Applications

  • LED driver
  • Constant current source
  • Automotive lighting
  • General illumination
  • Industrial lighting

Digi-Key P/N Manufacturer P/N Description Datasheet
LM3404MA-ND LM3404MA/NOPB IC LED DRVR HP CONST CURR 8-SOIC Datasheet
LM3404MR-ND LM3404MR/NOPB IC LED DRVR HP CONST CURR 8-PSOP Datasheet
LM3404HVMA-ND LM3404HVMA/NOPB IC LED DRVR HP CONST CURR 8-SOIC Datasheet
LM3404HVMR-ND LM3404HVMR/NOPB IC LED DRVR HP CONST CURR 8-PSOP Datasheet
LM3404HVEVAL-ND LM3404HVEVAL/NOPB BOARD EVALUATION LM3404HV Datasheet
LM3404EVAL-ND LM3404EVAL BOARD EVALUATION LM3404 Datasheet
LM3404MREVAL-ND LM3404MREVAL BOARD EVALUATION LM3404MR Datasheet

Please visit Digi-Key's Lighting Solutions Technology Zone to learn more about National Semiconductor's lighting products.