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 Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3783EDHD#PBF	5x4 DFN-16	E	$4.07	$2.85
LTC3783EDHD#TRPBF	5x4 DFN-16	E		$2.91
LTC3783EFE#PBF	TSSOP-16	E	$4.07	$2.85
LTC3783EFE#TRPBF	TSSOP-16	E		$2.97
LTC3783IDHD#PBF	5x4 DFN-16	I	$4.29	$3.00
LTC3783IDHD#TRPBF	5x4 DFN-16	I		$3.06
LTC3783IFE#PBF	TSSOP-16	I	$4.29	$3.00
LTC3783IFE#TRPBF	TSSOP-16	I		$3.06

Demo Boards

Part Number	Description	Price
DC850A	LTC3783 Demo Board \| Boost LED Driver Controller, 3V ≤ VIN ≤ 14.4V, VLED up to 25V @ 360mA	$125.00