LT3478

PRODUCTION

4.5A Monolithic LED Drivers with True Color PWM Dimming

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Part Models
8
1ku List Price
Starting From $4.31
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Part Details

  • True Color PWM™ Dimming Delivers Constant LED Color with Up to 3000:1 Range
  • Wide Input Voltage Range: 2.8V to 36V
  • 4.5A, 60mΩ, 42V Internal Switch
  • Drives LEDs in Boost, Buck-Boost or Buck Modes
  • Integrated Resistors for Inductor and LED Current Sensing
  • Program LED Current:
    • 100mA to 1050mA (LT3478-1)
    • (10mV to 105mV)/RSENSE (LT3478)
  • Program LED Current De-Rating vs Temperature
  • Separate Inductor Supply Input
  • Inrush Current Protection
  • Programmable Soft-Start
  • Fixed Frequency Operation from 200kHz to 2.25MHz
  • Open LED Protection (Programmable OVP)
  • Accurate Shutdown/UVLO Threshold with Programmable Hysteresis
  • 16-Pin Thermally Enhanced TSSOP Package
LT3478
4.5A Monolithic LED Drivers with True Color PWM Dimming
Automotive TFT LCD Backlight Efficiency vs VIN Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Digital Temperature Sensors 1
LTC2991
RECOMMENDED FOR NEW DESIGNS Octal I2C Voltage, Current, and Temperature Monitor
Multichannel Voltage Output D/A Converters 1
LTC2657
PRODUCTION Octal I2C 16-/12-Bit Rail-to-Rail DACs with 10ppm/°C Max Reference
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
TimerBlox 1
LTC6992
TimerBlox: Voltage-Controlled Pulse Width Modulator (PWM)
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT3478
  • LT3478-1
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
DC949A-A

LT3478EFE-1 Demo Board | Boost LED Driver, Internal RSENSE, 2.8V ≤ VIN ≤ 25V, VLED up to 36V @ 350mA

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Product Details

Demonstration circuit 949A is a 4.5A peak switch current boost LED driver with PWM dimming featuring the LT3478/LT3478-1. The LT3478 can be used for boost, buck mode, and buck-boost mode LED drivers. DC949A-A includes the LT3478-1, a fixed 1A boost LED driver with the LED current sense resistor inside the IC. DC949A-B features the LT3478 adjustable current boost LED driver; it requires an external sense resistor (R11). Both circuits are optimized to drive a 350mA LED string with a total LED voltage above the input voltage and below 40V (overvoltage protection is set between 36V and 40V).


The IC's input voltage range is 2.8V to 16V and the LED power input voltage range is 2.8V to 25V (for VLED >25V). With an internal 4.5A NPN power switch, floating current sense amplifier, LED current PWM dimming control, inrush current protection, programmable switching frequency, soft-start, and overvoltage protection, the LT3478-1/LT3478 are extremely powerful and versatile LED driving

eval board
schematic 2
DC949A-B

LT3478EFE Demo Board | Boost LED Driver, Adjustable LED Current, 2.8V ≤ VIN ≤ 25V, VLED up to 36V @ 350mA

Buy Now View Details

Product Details

Demonstration circuit 949A is a 4.5A peak switch current boost LED driver with PWM dimming featuring the LT3478/LT3478-1. The LT3478 can be used for boost, buck mode, and buck-boost mode LED drivers. DC949A-A includes the LT3478-1, a fixed 1A boost LED driver with the LED current sense resistor inside the IC. DC949A-B features the LT3478 adjustable current boost LED driver; it requires an external sense resistor (R11). Both circuits are optimized to drive a 350mA LED string with a total LED voltage above the input voltage and below 40V (overvoltage protection is set between 36V and 40V).


The IC's input voltage range is 2.8V to 16V and the LED power input voltage range is 2.8V to 25V (for VLED > 25V). With an internal 4.5A NPN power switch, floating current sense amplifier, LED current PWM dimming control, inrush current protection, programmable switching frequency, soft-start, and overvoltage protection, the LT3478-1/LT3478 are extremely powerful and versatile LED driving ICs.
DC949A-A
LT3478EFE-1 Demo Board | Boost LED Driver, Internal RSENSE, 2.8V ≤ VIN ≤ 25V, VLED up to 36V @ 350mA
DC949A-A - Schematic
DC949A-B
LT3478EFE Demo Board | Boost LED Driver, Adjustable LED Current, 2.8V ≤ VIN ≤ 25V, VLED up to 36V @ 350mA
DC949A-A - Schematic

Latest Discussions

3 Years Ago
RE: LT3478-1 Application Question
3 Years Ago
RE: LT3478-1 Voltage and Current Level
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