LT3954
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LT3954

40VIN LED Converter with Internal PWM Generator

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $4.31
Features
  • 3000:1 True Color PWM Dimming for LEDs
  • Wide VIN Range: 4.5V to 40V
  • Rail-to-Rail Current Sense Range: 0V to 40V
  • Internal 40V/5A Switch
  • Programmable PWM Dimming Signal Generator
  • Constant Current (±3%) and Constant-Voltage (±2%) Regulation
  • Accurate Analog Dimming
  • Drives LEDs in Boost, SEPIC, CUK, Buck Mode, Buck-Boost Mode, or Flyback Configuration
  • Output Short-Circuit Protected Boost
  • Open LED Protection and Reporting
  • Adjustable Switching Frequency: 100kHz to 1MHz
  • Programmable VIN UVLO with Hysteresis
  • C/10 Indication for Battery Chargers
  • Low Shutdown Current: <1μA
  • Thermally Enhanced 5mm × 6mm QFN Package
Additional Details
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The LT3954 is a DC/DC converter designed to operate as a constant-current source and constant-voltage regulator. It features an internal low side N-channel MOSFET rated for 40V/5A. The LT3954 is ideally suited for driving high current LEDs, but also has features to make it suitable for charging batteries and supercapacitors. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A voltage feedback pin serves as the input for several LED protection features, and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize efficiency, performance or external component size.

The LT3954 senses output current at the high side or at the low side of the load. The internal PWM generator can be configured to self-oscillate at fixed frequency with duty ratio programmable from 4% to 96%. When driven by an external signal, the PWM input provides LED dimming ratios of up to 3000:1. The CTRL input provides additional analog dimming capability.

Applications

  • High Power LEDs
  • Output Short-Circuit Protected Boost
  • Battery and SuperCap Chargers
  • Accurate Current Limited Voltage Regulators
Part Models 4
1ku List Price Starting From $4.31

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3954EUHE#PBF
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LT3954EUHE#TRPBF
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LT3954IUHE#PBF
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LT3954IUHE#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2079A

LT3954 Demo Board | Boost LED Driver with PWM Generator; 5V ≤ VIN ≤ 30V, VLED up to 32V @ 650mA

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DC2079A

LT3954 Demo Board | Boost LED Driver with PWM Generator; 5V ≤ VIN ≤ 30V, VLED up to 32V @ 650mA

LT3954 Demo Board | Boost LED Driver with PWM Generator; 5V ≤ VIN ≤ 30V, VLED up to 32V @ 650mA

Product Detail

Demonstration circuit 2079A is a Boost LED driver featuring the LT3954. The LT3954 is a multitopology 40VIN/40VOUT LED driver with an internal device 40V, 5.4A power switch. It generates its own PWMOUT waveform from its internal PWM generator for accurate PWM dimming with up to 33:1 brightness ratio. The demo circuit accepts an input voltage from 5V to 30V and drives up to 32V of LEDs at 650mA (when PVIN is less than VLED). DC2079A features both PWM and analog dimming of the LED string. It has an OPENLED flag that indicates when the LED string has been removed.  


 


Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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