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Analog Devices Inc. LT3756HMSE-2#PBF
- Part No.:
- LT3756HMSE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756HMSE-2#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:108
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Product details
Overview
LT3756HMSE-2#PBF from Analog Devices is a high-voltage, constant-current LED controller IC designed for automotive-grade LED driver applications. It operates from 6V to 100V input, delivers up to 100V output, supports 3000:1 PWM dimming, features high-side current sensing, and regulates LED current with 100mV sense threshold. It drives external N-channel MOSFETs in boost, buck, or buck-boost topologies - used in white LED headlamp drivers requiring AEC-Q100 compliance and 150°C junction operation.
For engineers reviewing the LT3756HMSE-2#PBF datasheet, LT3756HMSE-2#PBF pinout, LT3756HMSE-2#PBF application, or LT3756HMSE-2#PBF equivalent, key selection criteria include its –40°C to 150°C operating junction range, 100mV high-side current sense accuracy, programmable 100kHz–1MHz switching frequency, open LED protection via OPENLED pin, and compatibility with thermally demanding automotive lighting systems.
Technical Context
The LT3756HMSE-2#PBF implements fixed-frequency current-mode control with internal 7.15V INTVCC regulator powering gate driver and logic. Its high-side ISP/ISN current sense architecture enables flexible topology support (boost/buck/buck-boost/SEPIC/flyback) without ground loop interference. The FB pin serves dual roles: voltage regulation reference (1.25V nominal) and open-LED fault detection (trip at VFB – 50mV).
It integrates analog dimming via CTRL pin (adjusts current sense threshold from 0 to 100mV), true-color PWM dimming (3000:1), programmable soft-start (SS pin), and improved OPENLED status reporting versus earlier variants. The H-grade variant guarantees full electrical performance across –40°C to 150°C junction temperature, with thermal shutdown at 165°C and AEC-Q100 qualification for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide automotive battery transients including 100V load dump. |
| Output Voltage Capability | Up to 100V - enables driving long LED strings in headlamp and signage applications. |
| Current Sense Threshold | 100mV (typical) at ISP–ISN - enables precise, low-loss high-side LED current regulation. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor to optimize efficiency, EMI, or magnetics size. |
| Operating Junction Temperature | –40°C to 150°C - H-grade rating ensures reliability in under-hood automotive environments. |
| Dimming Ratio | 3000:1 PWM - preserves LED color fidelity across full brightness range without flicker. |
| Open LED Detection | FB < 1.20V (VFB – 50mV) asserts OPENLED - provides fail-safe status signaling for lamp-out diagnostics. |
Pinout & Package
LT3756HMSE-2#PBF uses a thermally enhanced 16-lead plastic MSOP package (3mm × 4.9mm) with exposed pad (Pin 17) soldered to PCB ground for thermal dissipation. θJA = 43°C/W, θJC = 4°C/W. Maximum junction temperature is 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output / Overvoltage fault signal | Drives LED disconnect FET; pulled low when FB > VFB + 60mV to prevent LED overcurrent. |
| FB (2) | Voltage feedback / Open-LED detection input | Regulates to 1.25V; falling below VFB – 50mV asserts OPENLED (LT3756-2 feature). |
| ISN (3) | Negative current sense input | High-side sense return; bias current <25µA; enables short-circuit detection when ISN < 3V. |
| ISP (4) | Positive current sense input | High-side sense high side; common-mode range up to 100V; bias current varies with CTRL voltage. |
| VC (5) | Error amplifier output | Integrates ISP–ISN error; high-impedance during PWM low to retain state for next cycle. |
| CTRL (6) | Analog dimming / Current threshold control | Sets ISP–ISN threshold from 0 to 100mV linearly (0–1V) then clamps (1.2V+); enables temperature compensation. |
| VREF (7) | 2.00V reference output | Stable 2V source (±2%); supplies CTRL divider or external temp-sensing circuitry; 100µA drive capability. |
| PWM (8) | Digital dimming enable | Active-high; disables switching and idles oscillator when low; internal pull-down. |
| OPENLED (9) | Open-circuit fault indicator | Open-drain output asserted when FB < VFB – 50mV (LT3756-2 specific improvement over base LT3756). |
| SS (10) | Soft-start timing control | 10µA internal pull-up to 2.5V rail; external capacitor sets startup ramp time; reset by UVLO or thermal fault. |
| RT (11) | Frequency programming | Resistor-to-GND sets oscillator frequency (100kΩ → ~375kHz); no internal pull-up/down. |
| SHDN/UVLO (12) | Enable / Input undervoltage lockout | 1.22V falling threshold with programmable hysteresis; sub-µA quiescent current in shutdown. |
| INTVCC (13) | Internal 7.15V LDO output | Powers gate driver and logic; requires 4.7µF local ceramic bypass; UVLO at 4.1V protects FET enhancement. |
| VIN (14) | Main power input | Accepts 6–100V; must be locally bypassed with ≥0.22µF ceramic capacitor near pin. |
| SENSE (15) | Low-side switch current sense | Kelvin-connected to source of external NMOS; monitors peak switch current for current-mode stability. |
| GATE (16) | NMOS gate driver output | Swings between GND and INTVCC; drives external power FET; forced low during fault/shutdown. |
| GND (17) | Power and signal ground / Exposed pad | Reference for SENSE and ISN; exposed thermal pad must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables topology flexibility (boost/buck/buck-boost) without compromising ground-referenced LED cathode/anode routing. |
| AEC-Q100 qualified (H-grade) | Validated for automotive under-hood use with guaranteed operation from –40°C to 150°C junction temperature. |
| Improved OPENLED status logic | LT3756-2 variant reasserts OPENLED after overvoltage event clears - enables robust fault recovery in dynamic lighting systems. |
| 100mV current sense threshold | Minimizes power loss in sense resistor while maintaining 1% current regulation accuracy over temperature. |
| Programmable 100kHz–1MHz frequency | Allows trade-off between EMI filtering cost, magnetics size, and efficiency in space-constrained headlamp modules. |
| 3000:1 true-color PWM dimming | Preserves chromaticity across full dimming range - critical for adaptive driving beam (ADB) and DLP-based automotive lighting. |
Applications
| Automotive LED Headlamps | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 30W+ white LED arrays in adaptive front-lighting systems (AFS) with transient-heavy 12V/24V vehicle electrical systems. IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current via high-side sensing; manages PWM dimming and open-circuit fault reporting. Use Value: AEC-Q100 H-grade rating ensures reliable operation at 150°C junction; 100V input withstands 100V load-dump transients per ISO 7637-2. |
Use Scenario: Powering multi-string high-lumen LED fixtures in warehouses and factories with unstable AC-DC converted supplies. IC Role / Device Role / Timing Role: Primary DC/DC controller enabling boost-mode operation from 12–48V DC bus to drive 72V LED strings. Use Value: Adjustable frequency avoids audible noise in large fixtures; open LED detection enables predictive maintenance alerts. |
| UV-C LED Disinfection Systems | Avionics Cabin Lighting |
Use Scenario: Driving pulsed UV-C LEDs (265nm) requiring precise current control and thermal derating at elevated ambient temperatures. IC Role / Device Role / Timing Role: Constant-current source with analog dimming (CTRL) for intensity tuning and soft-start (SS) to limit inrush into capacitive LED loads. Use Value: 100mV sense threshold minimizes self-heating in high-current UV LED drivers; 150°C rating supports sealed, convection-limited enclosures. |
Use Scenario: Retrofit LED lighting in aircraft cabins where EMI, weight, and reliability are critical, and input voltage varies from 18–32V DC. IC Role / Device Role / Timing Role: Buck-boost LED driver IC supporting wide VIN range and providing diagnostic OPENLED signaling for FAA-mandated fault logging. Use Value: Integrated open-LED and overvoltage protection meets DO-160 Section 22 lightning surge requirements; MSOP package reduces board area vs. QFN. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3756IMSE-2#PBF | Same functionality and pinout; rated for –40°C to 125°C junction (vs. 150°C for H-grade). | Suitable for non-under-hood automotive or industrial applications with lower ambient thermal stress. | Select when AEC-Q100 qualification is required but 150°C junction operation is not needed - lower cost than H-grade. |
| LT3756EUD-2#PBF | Identical electrical specs; uses 3mm × 3mm QFN package (vs. MSOP) with θJA = 68°C/W (less efficient thermal transfer). | Better suited for space-constrained PCBs where footprint matters more than thermal margin. | Choose for compact designs with adequate airflow or heatsinking; verify thermal performance at max load and ambient. |
Compared with LT3756IMSE-2#PBF, the LT3756HMSE-2#PBF adds guaranteed 150°C operation and tighter parametric limits at temperature extremes; compared with LT3756EUD-2#PBF, it offers superior thermal resistance (θJA = 43°C/W) and mechanical robustness in vibration-prone automotive mounting.
Availability
LT3756HMSE-2#PBF is available at Aetrix Electronics and suitable for automotive LED headlamps, industrial high-bay lighting, and UV-C disinfection systems requiring stable component supply, AEC-Q100 compliance, and extended temperature operation.
Supply support for LT3756HMSE-2#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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and connectivity applications.
The LT3756 family is engineered for high-reliability LED driver systems - particularly automotive lighting - where wide input range, high-side sensing, and integrated fault protection reduce system complexity and improve safety.
FAQ
What is the maximum junction temperature rating for LT3756HMSE-2#PBF?
The LT3756HMSE-2#PBF is rated for continuous operation from –40°C to 150°C junction temperature. This H-grade specification is validated per AEC-Q100 and enables deployment in under-hood automotive environments where ambient temperatures exceed 125°C. Thermal shutdown activates at 165°C to protect the device during overload conditions.
How does the OPENLED function differ on LT3756HMSE-2#PBF versus the base LT3756?
The LT3756HMSE-2#PBF implements the LT3756-2 variant's improved OPENLED logic: it reasserts the OPENLED pull-down after an overvoltage event (FB > VFB + 60mV) clears, provided FB remains above the open-LED threshold (VFB – 50mV). This enables faster fault recovery in dynamic lighting systems, unlike the base LT3756 which requires FB to drop below both thresholds before reasserting.
Can LT3756HMSE-2#PBF operate in buck mode with a 12V input driving a 5V LED string?
Yes - the LT3756HMSE-2#PBF supports buck-mode operation when configured with appropriate external components (e.g., diode, inductor, sense resistor). Its high-side current sensing and constant-current regulation remain fully functional. For 12V-to-5V conversion, ensure the output voltage does not fall below the minimum regulated output dictated by topology constraints and duty cycle limits.
What is the purpose of the CTRL pin on LT3756HMSE-2#PBF, and how is it used?
The CTRL pin on LT3756HMSE-2#PBF adjusts the ISP–ISN current sense threshold from 0 to 100mV. When VCTRL is 0–1V, threshold = 0.1 × VCTRL + offset; above 1.2V, it clamps at 100mV. This enables analog dimming, temperature compensation (e.g., using NTC), or current derating - all without modifying the main feedback loop.
Is LT3756HMSE-2#PBF pin-compatible with other LT3756-2 variants like LT3756EUD-2#PBF?
No - LT3756HMSE-2#PBF uses a 16-lead MSOP package, while LT3756EUD-2#PBF uses a 16-lead 3mm × 3mm QFN. Although electrically identical and sharing the same pin numbering convention, the physical footprints, thermal pads, and soldering requirements differ. PCB layout must match the specific package variant selected.
LT3756HMSE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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:
- 100V
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3756HMSE-2#PBF FAQ
1.How can I place an order for LT3756HMSE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756HMSE-2#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 LT3756HMSE-2#PBF reliable?
The price and inventory of LT3756HMSE-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3756HMSE-2#PBF is usually 5 days.
3.What payment methods are accepted for LT3756HMSE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756HMSE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756HMSE-2#PBF?
LT3756HMSE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756HMSE-2#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 LT3756HMSE-2#PBF?
For technical support, including LT3756HMSE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756HMSE-2#PBF requirements.
6.How does Aetrix verify that LT3756HMSE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT3756HMSE-2#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 LT3756HMSE-2#PBF meets industry standards.
7.What is the process for return or replacement of LT3756HMSE-2#PBF?
All LT3756HMSE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756HMSE-2#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 LT3756HMSE-2#PBF part is unused and in its original packaging.
Return procedure for LT3756HMSE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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