LTC3783 - PWM LED Driver and Boost, Flyback and SEPIC Converter

In applications where output load current must be returned to VIN, optional constant current/constant voltage regulation controls either output (or input) current or output voltage and provides a limit for the other. ILIM provides a 10:1 analog dimming ratio.

For low- to medium-power applications, No RSENSE mode can utilize the power MOSFET’s on-resistance to eliminate the current-sense resistor, thereby maximizing efficiency. The IC’s operating frequency can be set with an external resistor over a 20kHz to 1MHz range and can be synchronized to an external clock using the SYNC pin.

The LTC3783 is available in the 16-lead DFN and TSSOP packages.

Features
  • True Color PWM Delivers Constant Color with 3000:1 Dimming Ratio
  • Fully Integrated Load FET Driver for PWM Dimming Control of High Power LEDs
  • 100:1 Dimming from Analog Inputs
  • Wide FB Voltage Range: 0V to 1.23V
  • Constant Current or Constant Voltage Regulation
  • Low Shutdown Current: IQ = 20μA
  • 1% 1.23V Internal Voltage Reference
  • 2% RUN Pin Threshold with 100mV Hysteresis
  • Programmable Operating Frequency (20kHz to  1MHz) with One External Resistor
  • Synchronizable to an External Clock Up to 1.3fOSC
  • Internal 7V Low Dropout Voltage Regulator
  • Programmable Output Overvoltage Protection
  • Programmable Soft-Start
  • Can be Used in a No RSENSE Mode for VDS < 36V
  • 16-Lead DFN and TSSOP Packages
Typical Application

Applications
  • High Voltage LED Arrays
  • Telecom Power Supplies
  • 42V Automotive Systems
  • 24V Industrial Controls
  • IP Phone Power Supplies
Packaging

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC3783EDHD#PBF5x4 DFN-16E$4.07$2.85
LTC3783EDHD#TRPBF5x4 DFN-16E$2.91
LTC3783EFE#PBFTSSOP-16E$4.07$2.85
LTC3783EFE#TRPBFTSSOP-16E$2.97
LTC3783IDHD#PBF5x4 DFN-16I$4.29$3.00
LTC3783IDHD#TRPBF5x4 DFN-16I$3.06
LTC3783IFE#PBFTSSOP-16I$4.29$3.00
LTC3783IFE#TRPBFTSSOP-16I$3.06
Demo Boards
Part NumberDescriptionPrice
DC850ALTC3783 Demo Board | Boost LED Driver Controller, 3V ≤ VIN ≤ 14.4V, VLED up to 25V @ 360mA$125.00
Datasheet
Design Note
Reliability Data
LT Journal
Press Release
LTspice
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