LT3954

PRODUCTION

40VIN LED Converter with Internal PWM Generator

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Overview

  • 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

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
LT3954
40VIN LED Converter with Internal PWM Generator
95% Efiiciency 20W Boost LED Driver with Internal PWM Dimming PWM Dimming Waveforms at Various DIM Voltage Settings Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Protection Switches & Controllers 3
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
LTC4353
RECOMMENDED FOR NEW DESIGNS Dual Low Voltage Ideal Diode Controller
LT4320
LT4320-1
Ideal Diode Bridge Controller
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3954
LTspice

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.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC2079A

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

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Product Details

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.  


 
DC2079A
LT3954 Demo Board | Boost LED Driver with PWM Generator; 5V ≤ VIN ≤ 30V, VLED up to 32V @ 650mA
DC2079A Demo Board DC2079A Demo Board DC2079A Demo Board DC2079A Demo Board DC2079A - Schematic

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