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Analog Devices Inc. LT3744EUHE#PBF
- Part No.:
- LT3744EUHE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 36-WFQFN Exposed Pad
- Datasheet:
-
LT3744EUHE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:969
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Product details
Overview
LT3744EUHE#PBF from Analog Devices (formerly Linear Technology) is a fixed-frequency synchronous step-down LED driver controller designed for high-current RGB LED systems. It delivers up to 20A continuous or 40A pulsed LED current with ±3% regulation accuracy, programmable 100kHz–1MHz switching frequency, and supports inverting buck-boost topology to drive multicolor LEDs from a single Li-ion battery. It is used in DLP projectors and heads-up displays requiring precise multi-channel current control.
For engineers reviewing the LT3744EUHE#PBF datasheet, LT3744EUHE#PBF pinout, LT3744EUHE#PBF application, or LT3744EUHE#PBF equivalent, key selection considerations include its triple analog/digital dimming inputs (CTRL1/2/3 + PWM1/2/3), VEE-referenced floating ground architecture, 36-lead 5mm × 6mm QFN package with exposed thermal pad, and integrated open/short LED protection with fault flag reporting.
Technical Context
The LT3744EUHE#PBF implements peak current mode control with dual sensing paths: LED current via differential amplifier on LED_ISP/LED_ISN (regulated sense voltage = 60mV at full scale), and inductor current via ISP/ISN (OC threshold = 110mV). Its unique VEE-referenced signal domain enables grounded heat sink operation for RGB LEDs by allowing VEE to float negative relative to SGND.
It integrates three independent PWM output drivers (PWM_OUT1/2/3) with VFNEG-biased gate control for external NMOS dimming FETs, synchronized switching via RT resistor or external SYNC clock, and thermally derated current limiting via CTRLT pin. Voltage regulation is implemented through FB pin with 1.205V reference and ±3% accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports wide-input industrial and automotive LED power rails. |
| Max Continuous LED Current | 20A - enables high-brightness projection and display applications without external current sharing. |
| Current Regulation Accuracy | ±3% over temperature - ensures stable luminance across operating conditions without recalibration. |
| Switching Frequency Range | 100kHz to 1MHz - selectable via RT resistor; higher frequencies reduce inductor size, lower frequencies improve efficiency at high current. |
| Dimming Capability | 3000:1 PWM + 20:1 analog - supports flicker-free video-grade dimming and fine brightness control. |
| Package | 36-lead 5mm × 6mm QFN with exposed VEE pad - provides low thermal resistance (θJC = 3°C/W) for high-power dissipation. |
| Operating Temperature | –40°C to +125°C junction - qualified for automotive cabin and industrial ambient environments. |
Pinout & Package
LT3744EUHE#PBF is housed in a thermally enhanced 36-lead plastic QFN (5mm × 6mm) with exposed VEE pad (Pin 37) that must be soldered to PCB for thermal and electrical integrity. Pin functions are fully VEE-referenced for floating-ground operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable / Undervoltage Lockout Input | Turns on internal bias core at 1.30V rising threshold; full shutdown below 0.5V; referenced to SGND. |
| CTRL1/2/3 (2,4,5) | Analog Current Set Inputs | Select regulated LED current (60mV sense voltage at 1.5V input); each maps to corresponding PWM_OUT channel. |
| PWM1/2/3 (7,8,9) | Digital Channel Select Inputs | Choose which CTRL pin governs current regulation and activates PWM_OUT1/2/3 for RGB or multi-state LED control. |
| LED_ISP/LED_ISN (16,15) | LED Current Sense Differential Inputs | Regulate LED current by controlling voltage drop across external sense resistor; referenced to VEE. |
| ISP/ISN (22,21) | Inductor Current Sense Inputs | Monitor switch-node current for overcurrent protection (110mV threshold); common-mode range up to 36V. |
| TG/BG (29,32) | High-Side / Low-Side Gate Drivers | Drive external N-channel MOSFETs; TG pull-up/down RON = 3Ω/1.5Ω; BG = 2.5Ω/1.5Ω. |
| PWM_OUT1/2/3 (27,25,23) | External Dimming FET Drivers | Control NMOS switches in series with LED cathodes; require VFNEG bias for negative gate swing. |
| VEE (26,28,33,35,37) | Internal Ground Reference | All analog/digital outputs and drivers referenced to VEE; allows VEE to float –20V below SGND in inverting topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent current channels | Enables simultaneous or time-multiplexed RGB LED control using CTRL1/2/3 + PWM1/2/3 without external multiplexers. |
| Inverting buck-boost topology support | Allows VEE to float negative, enabling grounded heatsink for high-power RGB LEDs driven from single-cell Li-ion (3.3V–4.2V). |
| Fault detection and reporting | Open/short LED, overvoltage, and overcurrent events pull FAULT pin low with 50Ω impedance for system-level monitoring. |
| Thermal derating via CTRLT | Accepts NTC-based voltage to dynamically reduce regulated LED current as temperature rises-prevents thermal runaway. |
| Integrated 5V INTVCC regulator | Supplies internal circuitry and BOOST capacitor charging; 50mA current limit with UVLO ensures robust startup under load. |
Applications
| RGB Laser Projection Systems | DLP-Based Cinema Projectors |
|---|---|
Use Scenario: Driving red/green/blue laser diodes with independent current control and nanosecond-level dimming transitions. IC Role / Device Role / Timing Role: Synchronous step-down controller with triple analog/digital dimming inputs and PWM_OUT drivers for per-color current regulation and blanking. Use Value: Enables 5000:1 flicker-free dimming and precise color mixing via 20A pulsed current capability and ±3% regulation accuracy. |
Use Scenario: Powering high-lumen DMD illumination engines requiring stable, fast-settling LED current under dynamic video loads. IC Role / Device Role / Timing Role: Fixed-frequency peak current mode controller with voltage regulation loop and fault reporting for system reliability. Use Value: Maintains ±3% LED current accuracy across 3.3V–36V input and –40°C to +125°C, critical for consistent image brightness and color fidelity. |
| Automotive Heads-Up Displays (HUD) | High-Power Stage Lighting |
Use Scenario: Illuminating combiner optics with high-intensity white or colored LEDs in vehicle cockpit environments. IC Role / Device Role / Timing Role: Inverting buck-boost LED driver with floating VEE reference to enable grounded heatsink mounting on metal chassis. Use Value: Eliminates need for isolated gate drivers or complex DC/DC stages-reduces BOM count and improves thermal management in space-constrained HUD modules. |
Use Scenario: Controlling high-power theatrical LED arrays requiring rapid strobing, color blending, and thermal derating. IC Role / Device Role / Timing Role: Multi-channel LED current controller with CTRLT-based thermal foldback and 3000:1 PWM dimming resolution. Use Value: Prevents LED degradation during extended high-output operation while supporting smooth intensity ramping and scene transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EUHE#PBF | Single-channel synchronous boost/buck-boost LED controller; no integrated PWM_OUT drivers or triple CTRL inputs. | Limited to monochrome or externally multiplexed RGB; lacks native 3-channel dimming logic. | Choose when only one LED string is needed and external FET control is acceptable. |
| LM3409QMHX/NOPB | Single-channel buck LED controller with analog dimming only; no PWM_OUT pins, no VEE floating capability. | Not suitable for RGB or inverting topologies; max 5A output; no thermal derating input. | Choose for cost-sensitive, single-color automotive lighting where 20A capability is unnecessary. |
Compared with LTC3783EUHE#PBF and LM3409QMHX/NOPB, the LT3744EUHE#PBF uniquely integrates triple analog/digital dimming, VEE-referenced floating ground, and dedicated PWM_OUT drivers-making it the only solution capable of direct RGB LED control from a single Li-ion cell without external logic or isolation.
Availability
LT3744EUHE#PBF is available at Aetrix Electronics and suitable for DLP projectors, automotive heads-up displays, and high-power stage lighting requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +125°C.
Supply support for LT3744EUHE#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its high-performance analog IC portfolio, including precision power management and LED control solutions.
The LT3744EUHE#PBF belongs to Linear's high-current LED driver controller product line, designed specifically for RGB projection, DLP illumination, and multi-channel solid-state lighting systems demanding tight current regulation and flexible topology support.
FAQ
What is the maximum pulsed LED current supported by the LT3744EUHE#PBF?
The LT3744EUHE#PBF supports up to 40A pulsed LED current, verified in typical application circuits with appropriate external MOSFETs, inductor, and thermal design. This capability enables high-brightness flash modes in projection and stage lighting. The LT3744EUHE#PBF achieves this using peak current mode control with fast-response current sensing on LED_ISP/LED_ISN and robust gate drivers (TG/BG) rated for high dI/dt.
How does the LT3744EUHE#PBF support inverting buck-boost topology?
The LT3744EUHE#PBF supports inverting buck-boost by referencing all analog and gate drive signals to VEE, which can float up to –20V below SGND. This allows the LED string to be connected between VEE and SGND, enabling a grounded heatsink while driving from a single Li-ion battery. The LT3744EUHE#PBF's block diagram confirms VEE as the internal ground for SW, BOOST, TG, BG, and all sense amplifiers.
Can the LT3744EUHE#PBF drive multiple LED strings independently?
Yes-the LT3744EUHE#PBF provides three independent current regulation paths via CTRL1/2/3 and corresponding PWM1/2/3 inputs, each activating dedicated PWM_OUT1/2/3 drivers. This allows true simultaneous or time-multiplexed control of red, green, and blue LED strings without external multiplexers. Each path maintains ±3% current accuracy and supports 20:1 analog + 3000:1 PWM dimming.
What protection features are integrated into the LT3744EUHE#PBF?
The LT3744EUHE#PBF integrates open/short LED detection, overvoltage protection (via FB pin), inductor overcurrent protection (110mV ISP–ISN threshold), thermal shutdown, and fault flag reporting on the FAULT pin. When FB falls below 250mV or exceeds 1.1V (with LED_ISP–LED_ISN < 6mV), FAULT pulls low with 50Ω impedance-enabling immediate system-level response. The LT3744EUHE#PBF also disables BG during severe overcurrent to prevent damage.
Is the LT3744EUHE#PBF pin-compatible with other Linear LED controllers?
No-the LT3744EUHE#PBF uses a proprietary 36-lead QFN layout optimized for VEE-referenced operation and triple-channel control. Its pinout differs significantly from single-channel controllers like LT3756 or LTC3783. Pin compatibility is not claimed in the datasheet, and substitution requires full schematic and layout revision. The LT3744EUHE#PBF's unique VEE-exposed pad configuration and signal referencing make mechanical or electrical drop-in replacement infeasible.
LT3744EUHE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 3.3V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LT3744EUHE#PBF FAQ
1.How can I place an order for LT3744EUHE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3744EUHE#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT3744EUHE#PBF reliable?
The price and inventory of LT3744EUHE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3744EUHE#PBF is usually 5 days.
3.What payment methods are accepted for LT3744EUHE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3744EUHE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3744EUHE#PBF?
LT3744EUHE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3744EUHE#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT3744EUHE#PBF?
For technical support, including LT3744EUHE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3744EUHE#PBF requirements.
6.How does Aetrix verify that LT3744EUHE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3744EUHE#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT3744EUHE#PBF meets industry standards.
7.What is the process for return or replacement of LT3744EUHE#PBF?
All LT3744EUHE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3744EUHE#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT3744EUHE#PBF part is unused and in its original packaging.
Return procedure for LT3744EUHE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3744EUHE#PBF Tags
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BCR402RE6327HTSA1
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BCR420UE6433HTMA1
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