LT3744
LT3744
PRODUCTIONHigh Current Synchronous Step-Down LED Driver
- Part Models
- 4
- 1ku List Price
- Starting From $5.98
Viewing:
Overview
- Ideal for Driving Up to 40A LEDs
- Up to 3000:1 PWM Dimming
- 20:1 Analog Dimming
- ±3% Current Regulation Accuracy
- ±3% Voltage Regulation Accuracy
- Unique Inverting Buck-Boost Topology Allows Grounded Heat Sink to Be Used for RGB LEDs
- 3.3V to 36V Input Voltage Range
- Peak Current Mode with DC LED Current Sensing
- Open and Shorted LED Protection and Fault Reporting
- Floating LED Driver Allows Single Power Solution to Drive Multicolor LEDs or Single LED with Three Different Regulated Currents
- Thermally Enhanced 5mm × 6mm QFN 36-Lead Package
The LT3744 is a fixed frequency synchronous step-down DC/DC controller designed to drive a LED load at up to 20A continuous or 40A pulsed. The peak current mode controller will maintain ±3% LED current regulation over a wide output voltage range, from VEE to VIN. By allowing VEE to float to negative voltages, several LEDs in series can be driven from a single Li-Ion battery with a simple, single step-down output stage. PWM dimming is achieved with the PWM pins. The regulated LED current is set with analog voltages at the CTRL pins. Regulated voltage and overvoltage protection are set with a voltage divider from the output to the FB pin. The switching frequency is programmable from 100kHz to 1MHz through an external resistor on the RT pin.
Additional features include an accurate external reference voltage, a control input for thermally derating regulation current, an accurate EN/UVLO pin, an open-drain output fault flag, OVLO, frequency synchronization, and thermal shutdown.
Applications
- LED Driver for DLP Projectors
- Heads-Up Displays
- High Power LED
Documentation
Data Sheet 1
User Guide 2
Technical Articles 3
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3744EUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3744EUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3744IUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3744IUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 17, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process |
||
| LT3744EUHE#PBF | PRODUCTION | |
| LT3744EUHE#TRPBF | PRODUCTION | |
| LT3744IUHE#PBF | PRODUCTION | |
| LT3744IUHE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3744
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.
