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Analog Devices Inc. LT3756EUD#TRPBF
- Part No.:
- LT3756EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LT3756EUD#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,200
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Product details
Overview
LT3756EUD#TRPBF from Analog Devices is a high-voltage constant-current LED controller IC designed for automotive and industrial LED drivers. It operates from 6V to 100V input, delivers up to 100V output, supports 3000:1 PWM dimming, features 100mV high-side current sensing, and drives external N-channel MOSFETs in boost, buck, or buck-boost topologies - enabling 94% efficient 30W white LED headlamp designs.
For engineers reviewing the LT3756EUD#TRPBF datasheet, LT3756EUD#TRPBF pinout, LT3756EUD#TRPBF application, or LT3756EUD#TRPBF equivalent, key selection considerations include its 100VIN/100VOUT capability, programmable 100kHz–1MHz switching frequency, AEC-Q100 qualification (E-grade), thermally enhanced 3mm × 3mm QFN package, and dual-loop (constant-current + constant-voltage) regulation architecture.
Technical Context
The LT3756EUD#TRPBF implements fixed-frequency current-mode control with internal 7.15V INTVCC regulator, ground-referenced FB pin for voltage loop regulation and open-LED protection, and high-side ISP/ISN current sense inputs enabling topology flexibility. Its VC error amplifier integrates ISP–ISN error against CTRL-set threshold (100mV full-scale) or FB reference (1.25V nominal).
It supports true-color PWM dimming via dedicated PWM pin (3000:1 ratio), analog dimming via CTRL pin (0–1.1V range), programmable soft-start (SS pin), frequency adjustment (RT pin), and undervoltage lockout with hysteresis (SHDN/UVLO pin). The GATE driver delivers fast rise/fall times (<35ns) into 3300pF load and is internally clamped to INTVCC/GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide-range DC supplies including 12V/24V/48V systems and transient-tolerant automotive battery rails. |
| Output Voltage Capability | Up to 100V - enables driving long LED strings in series without cascading converters. |
| Current Sense Threshold | 100mV (typical) at ISP–ISN - enables precise, low-loss high-side LED current sensing with minimal power dissipation. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor to optimize efficiency, EMI, or magnetic component size. |
| FB Regulation Voltage | 1.25V (nominal) - provides stable constant-voltage feedback reference for CV mode or open-LED detection. |
| INTVCC Regulator | 7.15V (typical), 17mA current limit - powers gate driver and internal logic; dropout <1V at –10mA ensures robust operation down to VIN ≈ 7V. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and harsh industrial environments. |
| Package | 16-lead 3mm × 3mm QFN with exposed thermal pad - enables high-power density and efficient heat transfer to PCB ground plane. |
Pinout & Package
LT3756EUD#TRPBF is housed in a thermally enhanced 16-lead (3mm × 3mm) plastic QFN package with exposed GND pad (Pin 17), requiring soldering to PCB for thermal and electrical integrity. θJA = 68°C/W, θJC = 4.2°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output / FB overvoltage fault signal | Drives LED disconnect NMOS; pulled low when FB exceeds VFB + 60mV to protect LEDs from overcurrent. |
| FB (Pin 2) | Voltage feedback input | Regulates output voltage to 1.25V; asserts OPENLED when FB drops below VFB – 50mV (open-LED detection). |
| ISN (Pin 3) | Negative current sense input | High-side current sense return; enables short-circuit detection when ISN < 3V and ISP–ISN > 150mV. |
| ISP (Pin 4) | Positive current sense input | High-side current sense input; bias current varies with CTRL voltage; used with ISN for 100mV threshold sensing. |
| VC (Pin 5) | Error amplifier output | Integrates ISP–ISN vs. CTRL-set threshold or FB error; high-impedance during PWM low to retain state. |
| CTRL (Pin 6) | Current threshold programming | Sets LED current sense threshold: 100mV (full scale) when VCTRL > 1.2V; linearly adjustable down to ~0V. |
| VREF (Pin 7) | 2.0V reference output | Stable 2.0V source (±2%) for CTRL divider or temperature compensation networks; supplies ≤100µA. |
| PWM (Pin 8) | Digital dimming enable | Active-high input; disables switching, idles oscillator, and forces GATE/PWMOUT low when low. |
| SS (Pin 9) | Soft-start timing | 10µA pull-up to 2.5V rail; external capacitor sets startup ramp time; reset by UVLO or thermal fault. |
| RT (Pin 10) | Frequency programming | Resistor-to-GND sets oscillator frequency from 100kHz to 1MHz; RT = 100kΩ yields ~1MHz. |
| SHDN/UVLO (Pin 11) | Enable & undervoltage detection | 1.22V falling threshold with programmable hysteresis; pulls 2.1µA below threshold to set rising edge. |
| INTVCC (Pin 12) | Internal regulated supply | 7.15V LDO output powering gate driver and logic; requires 4.7µF local ceramic bypass capacitor. |
| VIN (Pin 13) | Main power input | Accepts 6V–100V; must be locally bypassed with ≥0.22µF ceramic capacitor near IC. |
| SENSE (Pin 14) | Low-side switch current sense | Kelvin-connected to source of external N-MOSFET; monitors peak switch current for current-mode control. |
| GATE (Pin 15) | N-MOSFET gate driver | Drives external FET gate between INTVCC and GND; fast 35ns rise/fall into 3300pF; disabled during shutdown. |
| GND (Pin 16) | Power & signal ground | Reference for SENSE, ISN, and exposed thermal pad; must be solidly connected to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables flexible boost/buck/buck-boost/SEPIC/flyback configurations without compromising ground-referenced load or controller layout. |
| True-color PWM dimming | 3000:1 dimming ratio with minimal color shift - achieved via dedicated PWM pin controlling duty cycle without altering current regulation setpoint. |
| Dual-loop regulation | Simultaneous constant-current (via ISP/ISN) and constant-voltage (via FB) control - supports LED string regulation and open-circuit protection in one IC. |
| AEC-Q100 Grade E qualification | Validated for automotive applications across –40°C to +125°C junction temperature - includes HTOL, TC, ESD, and AC/DC stress testing. |
| Programmable frequency & soft-start | RT pin adjusts switching frequency (100kHz–1MHz); SS pin controls startup dI/dt and inrush current via external capacitor. |
| Integrated protection suite | Includes open-LED detection (FB-based), short-circuit detection (ISP–ISN >150mV at low ISN), overvoltage shutdown (PWMOUT forced low), and thermal shutdown. |
Applications
| Automotive LED Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 30W+ white LED arrays in vehicle front lighting with strict EMI, thermal, and reliability requirements. IC Role / Device Role / Timing Role: Constant-current controller managing boost converter topology; regulates LED current while monitoring open-circuit faults via FB pin. Use Value: 94% efficiency at 30W reduces heatsink size; AEC-Q100 qualification ensures lifetime compliance; 3000:1 PWM dimming enables adaptive driving beam control. |
Use Scenario: Powering multi-string high-lumen LED fixtures in warehouses and factories with 24–48V DC distribution buses. IC Role / Device Role / Timing Role: High-voltage buck-boost LED driver IC supporting variable input (24–60V) and fixed-output current for parallel LED strings. Use Value: 100VOUT capability allows long LED strings; 100mV current sense minimizes I²R loss; programmable frequency avoids audible noise in sensitive environments. |
| UV-C Disinfection Systems | Outdoor Streetlight Drivers |
|
Use Scenario: Driving high-current UVC LEDs (265nm–285nm) requiring precise current regulation and thermal derating. IC Role / Device Role / Timing Role: Constant-current source with analog dimming (CTRL pin) for intensity control and temperature compensation using VREF output. Use Value: CTRL pin enables real-time current scaling based on temperature sensor feedback; high-side sensing avoids ground loop interference in isolated systems. |
Use Scenario: Outdoor LED streetlights powered from 12–48V solar/battery or PoE++ infrastructure with surge immunity requirements. IC Role / Device Role / Timing Role: Robust LED controller handling 100V transients (e.g., load dump) while maintaining stable current regulation across wide temperature range. Use Value: 100VIN rating withstands automotive-grade transients; –40°C to +125°C operation ensures reliability in uncontrolled enclosures; exposed QFN pad improves thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#TRPBF | Lower max input (60V), no integrated 2V reference, uses external VREF; supports only boost/buck-boost; lacks OPENLED status pin. | Better suited for non-automotive, lower-voltage industrial LED drivers where 100V tolerance is unnecessary. | Select when cost sensitivity outweighs 100V input need and AEC-Q100 is not required. |
| LM3410XSDX/NOPB | Fixed 1.6MHz frequency, max 40V input, no high-side sensing, no CV mode, no SYNC or OPENLED pins. | Targeted at compact, low-power portable LED applications (e.g., flashlights) with simple boost-only topology. | Choose only for space-constrained, low-power (<5W), single-topology designs where advanced protection and flexibility are not needed. |
Compared with LTC3783EFE#TRPBF and LM3410XSDX/NOPB, the LT3756EUD#TRPBF uniquely combines 100VIN/100VOUT capability, AEC-Q100 qualification, high-side current sensing, dual-loop regulation, and integrated 2V reference - making it the only option among the three qualified for demanding automotive headlamp and industrial high-power LED systems.
Availability
LT3756EUD#TRPBF is available at Aetrix Electronics and suitable for automotive LED headlamps, industrial high-bay lighting, UV-C disinfection systems, and outdoor streetlight drivers requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3756EUD#TRPBF 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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT3756 product line was engineered specifically for high-reliability, high-voltage LED current regulation in automotive and industrial environments - emphasizing topology flexibility, fault resilience, and thermal robustness in compact packages.
FAQ
What is the maximum input voltage supported by the LT3756EUD#TRPBF?
The LT3756EUD#TRPBF supports an absolute maximum input voltage of 100V, with guaranteed operation from 6V to 100V. This makes it suitable for automotive battery systems subject to load-dump transients and industrial DC bus applications up to 100V. The device includes internal protection to withstand 100V continuously without degradation.
Does the LT3756EUD#TRPBF support both constant-current and constant-voltage regulation?
Yes, the LT3756EUD#TRPBF supports dual-loop regulation: constant-current via high-side ISP/ISN sensing (100mV threshold), and constant-voltage via the FB pin referenced to 1.25V. Both loops operate simultaneously - the current loop dominates during normal LED operation, while the voltage loop activates during open-LED conditions or CV-mode applications like battery charging.
What package type and thermal characteristics does the LT3756EUD#TRPBF use?
The LT3756EUD#TRPBF uses a 16-lead 3mm × 3mm plastic QFN package with exposed thermal pad (Pin 17 = GND). Its thermal resistance is θJA = 68°C/W and θJC = 4.2°C/W. The exposed pad must be soldered to a PCB ground plane for effective heat dissipation and optimal performance in high-current LED driver applications.
How does the LT3756EUD#TRPBF implement open-LED detection?
The LT3756EUD#TRPBF detects open-LED conditions using the FB pin: when FB voltage falls below (VFB – 50mV), the OPENLED pin (Pin 9) is actively pulled low. This status signal remains latched during PWM low periods and updates when PWM goes high. The function is enabled only on LT3756 and LT3756-2 variants - confirmed for LT3756EUD#TRPBF per Analog Devices' ordering matrix.
Is the LT3756EUD#TRPBF AEC-Q100 qualified, and for which grade?
Yes, the LT3756EUD#TRPBF is AEC-Q100 qualified for Grade E (–40°C to +125°C junction temperature). This qualification covers stress tests including HTOL, temperature cycling, ESD, and AC/DC life testing - confirming suitability for automotive under-hood LED lighting applications such as headlamps and daytime running lights.
LT3756EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 100V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LT3756EUD#TRPBF FAQ
1.How can I place an order for LT3756EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756EUD#TRPBF 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 LT3756EUD#TRPBF reliable?
The price and inventory of LT3756EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3756EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3756EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756EUD#TRPBF?
LT3756EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756EUD#TRPBF 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 LT3756EUD#TRPBF?
For technical support, including LT3756EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756EUD#TRPBF requirements.
6.How does Aetrix verify that LT3756EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3756EUD#TRPBF 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 LT3756EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3756EUD#TRPBF?
All LT3756EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756EUD#TRPBF, 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 LT3756EUD#TRPBF part is unused and in its original packaging.
Return procedure for LT3756EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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