LM3434 High-Brightness LED Driver


National Semiconductor's high-brightness LED driver from the PowerWise® family

National Semiconductor's LM3434 is an adaptive, constant on-time DC/DC buck (step-down) constant current controller (a true current source). The LM3434 provides a constant current for illuminating high power LEDs. The output configuration allows the anodes of multiple LEDs to be tied directly to the ground referenced chassis for maximum heat sink efficacy. The high frequency capable architecture allows the use of small external passive components and no output capacitor while maintaining low LED ripple current.    LM3434 Datasheet
National Semiconductor LM3434 High Brightness LED Driver

  • Overview
  • Features & Applications
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Overview

Two control inputs are used to modulate LED brightness. An analog current control input is provided so the LM3434 can be adjusted to compensate for LED manufacturing variations and/or color temperature correction. The other input is a logic level PWM control of LED current. The PWM functions by shorting out the LED with a parallel switch allowing high PWM dimming frequencies. High frequency PWM dimming allows digital color temperature control, interference blanking, field sequential illumination, and brightness control. Additional features include thermal shutdown, VCC under-voltage lockout, and logic level shutdown mode. The LM3434 is available in a low profile LLP-24 package.


Features
  • Operating input voltage range of -9V to -30V w.r.t. LED anode
  • Control inputs are referenced to the LED anode
  • Output current greater than 6A
  • Greater than 30kHz PWM frequency capable
  • Negative output voltage capability allows LED anode to be tied
    directly to chassis for maximum heat sink efficacy
  • No output capacitor required
  • Up to 1MHz switching frequency
  • Low IQ, 1mA typical
  • Soft start
  • Adaptive programmable ON time allows for constant ripple current
  • LLP-24 package

Applications
  • Projection systems
  • Solid-state lighting
  • Automotive lighting

  • RoHS Compliant


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 Available in Tape & Reel (TR-ND), Cut Tape (CT-ND), and custom Digi-Reel® (DKR-ND)
Digi-Key
Part Number
National Semi
Part Number
Frequency
Voltage -
Supply
Operating
Temperature
Package /
Case
LM3434SQ/NOPB
1MHz
9V ~ 30V
-40°C ~ 125°C
24-LLP

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