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Analog Devices Inc. LT3756JMSE-2#PBF
- Part No.:
- LT3756JMSE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756JMSE-2#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,306
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Product details
Overview
LT3756JMSE-2#PBF from Analog Devices is a high-voltage, constant-current LED controller IC designed for automotive-grade LED driver applications. It operates as a current-mode DC/DC controller driving external N-channel MOSFETs, supports 6V–100V input and up to 100V output, delivers true-color PWM dimming up to 3000:1, and features high-side current sensing for boost/buck/buck-boost topologies. It is used in high-reliability white LED headlamp drivers.
For engineers reviewing the LT3756JMSE-2#PBF datasheet, LT3756JMSE-2#PBF pinout, LT3756JMSE-2#PBF application, or LT3756JMSE-2#PBF equivalent, key selection criteria include its AEC-Q100 qualification, –40°C to +150°C junction temperature rating, 100mV high-side current sense threshold, open LED protection with dedicated OPENLED pin, and programmable 100kHz–1MHz switching frequency via RT resistor.
Technical Context
The LT3756JMSE-2#PBF implements fixed-frequency current-mode control with internal 7.15V regulated INTVCC supply, ground-referenced FB pin enabling dual constant-current/constant-voltage regulation, and integrated transconductance error amplifier (VC) for loop stability. Its high-side ISP/ISN current sensing architecture decouples LED string grounding from power stage layout constraints.
It integrates programmable undervoltage lockout with hysteresis on SHDN/UVLO, soft-start via SS pin with 10µA pull-up, and enhanced open LED fault detection with latched status reporting on OPENLED - a feature specifically improved in the LT3756-2 variant versus earlier versions. The J-grade temperature range (–40°C to +150°C) confirms full specification compliance across automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide automotive battery transients including 100V load dump events without external clamping. |
| Output Voltage Capability | Up to 100V - enables direct drive of long LED strings in headlamp and signage applications without intermediate conversion. |
| Current Sense Threshold | 100mV (typical), ±2% over temp - enables precise, low-loss high-side current sensing with minimal PCB trace IR drop impact. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT pin resistor to optimize magnetic size, efficiency, and EMI performance per design requirements. |
| Operating Junction Temp | –40°C to +150°C - fully specified AEC-Q100 Grade 0 rating ensures reliability in engine compartment deployments. |
| Open LED Detection | Dedicated OPENLED pin with –50mV hysteresis vs FB reference - provides fail-safe status reporting without requiring external comparators or polling. |
| Dimming Interface | PWM input (3000:1 ratio) + CTRL analog dimming - supports both digital precision and smooth analog brightness control in same design. |
Pinout & Package
LT3756JMSE-2#PBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4.9mm) with exposed pad (Pin 17) soldered to PCB ground for thermal dissipation (θJC = 4°C/W). The package is rated for 150°C maximum junction temperature and supports automated optical inspection (AOI) compatible marking "37562".
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output / Overvoltage fault signal | Drives external disconnect FET; pulled low when FB exceeds VFB + 60mV to protect LEDs during overvoltage events. |
| FB (2) | Voltage feedback / Open LED detection input | Ground-referenced node regulating constant-voltage mode; triggers OPENLED assertion when below VFB – 50mV. |
| ISN (3) | Negative current sense input | Connects to low-side of high-side sense resistor; bias current <25µA minimizes measurement error at low currents. |
| ISP (4) | Positive current sense input | Connects to high-side of sense resistor; common-mode range extends to 100V, enabling direct high-side sensing in boost configurations. |
| VC (5) | Error amplifier output | High-impedance compensation node; stores demand state during PWM off-time for seamless dimming transitions. |
| CTRL (6) | Analog dimming / Current threshold control | Programs ISP–ISN threshold from 0 to 100mV linearly (0–1V) then holds full scale (>1.2V); enables temperature-compensated LED current control. |
| VREF (7) | 2.00V reference output | Stable 2V source (±1.5% over temp) capable of sourcing 100µA; used to bias CTRL divider or external temperature-sensing circuits. |
| PWM (8) | Digital dimming enable input | Active-high logic input with internal pull-down; low state disables switching, idles oscillator, and places GATE/PWMOUT in tri-state. |
| OPENLED (9) | Open-circuit fault indicator | Open-drain output asserted when FB < VFB – 50mV; requires external pull-up <1mA; latched behavior ensures fault visibility during PWM off periods. |
| SS (10) | Soft-start timing control | 10µA internal current source charges external capacitor; controls ramp rate of VC and oscillator frequency during startup. |
| RT (11) | Frequency programming input | Resistor-to-GND sets oscillator frequency; 100kΩ yields ~375kHz; supports precise EMI tuning and magnetics optimization. |
| SHDN/UVLO (12) | Shutdown and input UVLO input | 1.22V falling threshold with programmable hysteresis; enables robust start-up sequencing and brown-out protection in automotive systems. |
| INTVCC (13) | Internal 7.15V regulator output | Supplies gate driver and internal logic; requires 4.7µF local ceramic bypass; drops out at VIN – 1V, disabling GATE if INTVCC < 4.1V. |
| VIN (14) | Main power input | Accepts 6–100V; must be bypassed with ≥0.22µF ceramic capacitor near pin; powers INTVCC LDO and internal circuitry. |
| SENSE (15) | Low-side switch current sense | Kelvin-connected to source of external NMOS; monitors peak switch current; clamped at 108mV to prevent overcurrent damage. |
| GATE (16) | NMOS gate driver output | Switches between INTVCC and GND; drives external power FET; pulled low during shutdown/fault/idle for safe turn-off. |
| GND (17) | Power and signal ground / Exposed pad | Primary return path; exposed pad must be soldered to solid PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Fully tested and characterized for –40°C to +150°C operation, meeting automotive reliability and lifetime requirements without derating. |
| High-side current sensing (ISP/ISN) | Enables flexible topology selection (boost/buck/buck-boost/SEPIC/flyback) while maintaining common ground between controller and LED load. |
| Integrated OPENLED status pin | Provides immediate, latched fault indication for open-circuit LED strings - eliminates need for external monitoring circuitry or firmware polling. |
| Programmable 100kHz–1MHz switching | Allows trade-off between magnetic size (higher fSW → smaller inductors) and conduction losses (lower fSW → higher efficiency at high current). |
| True-color PWM dimming (3000:1) | Maintains consistent LED chromaticity across full dimming range by avoiding low-frequency current modulation artifacts. |
| Constant-current + constant-voltage dual regulation | Supports hybrid LED driver designs where voltage regulation protects against overvoltage during cold start or open-circuit conditions. |
Applications
| Automotive 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 LED controller managing high-side sensing, PWM dimming, and open-LED fault reporting in real time. Use Value: AEC-Q100 qualification and 150°C operation ensure uninterrupted function during engine bay thermal cycling; 100V input withstands ISO 7637-2 pulse 5a load dump events. |
Use Scenario: Powering multi-string high-lumen LED fixtures in warehouse and factory environments with unstable AC-DC front-end supplies. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing buck-boost topology to maintain regulated current despite wide input variation (e.g., 18–72V DC bus). Use Value: High-side current sensing simplifies PCB layout in high-power metal-core board designs; programmable frequency avoids audible noise in sensitive industrial zones. |
| UV-C Disinfection Systems | Avionics Exterior Lighting |
|
Use Scenario: Driving high-voltage UV-C LED strings (e.g., 40–80V forward) requiring precise current regulation and thermal derating feedback. IC Role / Device Role / Timing Role: Constant-current source with CTRL pin interfaced to temperature sensor for dynamic current reduction as heatsink temperature rises. Use Value: VREF output powers external NTC bias network; ISP/ISN common-mode range up to 100V accommodates series-connected UV-C diodes without level-shifting. |
Use Scenario: Certified exterior lighting (navigation, anti-collision) in commercial aircraft with strict DO-160 lightning-induced transient immunity requirements. IC Role / Device Role / Timing Role: Robust LED driver core supporting MIL-STD-704/DO-160-compliant input filtering and fault-safe OPENLED reporting to flight control systems. Use Value: 100V absolute max input rating and low shutdown current (<1µA) meet stringent avionics power budget and survivability mandates. |
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 temperature (I-grade), not 150°C. | Suitable for cabin-mounted or non-under-hood automotive modules where ambient temperature remains <125°C. | Select LT3756JMSE-2#PBF when full AEC-Q100 Grade 0 (150°C) operation is required; use I-grade for cost-sensitive interior lighting. |
| LT3762EMSE#PBF | Successor device with higher efficiency, lower IQ, and integrated boost diode driver; lacks OPENLED pin and uses different fault reporting scheme. | Targets next-gen designs prioritizing efficiency and integration over legacy fault-pin compatibility. | LT3756JMSE-2#PBF remains preferred where OPENLED status signaling, proven field reliability, and identical footprint are mandatory. |
Compared with LT3756IMSE-2#PBF, the LT3756JMSE-2#PBF adds guaranteed 150°C operation for under-hood deployment; compared with LT3762EMSE#PBF, it retains the dedicated OPENLED pin and mature control architecture essential for safety-critical fault reporting in certified lighting systems.
Availability
LT3756JMSE-2#PBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-bay LED drivers, UV-C disinfection equipment, and avionics exterior lighting requiring stable component supply with full AEC-Q100 compliance and extended temperature support.
Supply support for LT3756JMSE-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing (DSP) semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3756 family is part of Analog Devices' Power by Linear™ portfolio, engineered specifically for high-reliability, high-voltage LED driver applications demanding precision current regulation, wide input range, and automotive-grade robustness.
FAQ
What is the maximum operating junction temperature for LT3756JMSE-2#PBF?
The LT3756JMSE-2#PBF is rated for a maximum junction temperature of +150°C and is fully specified across –40°C to +150°C. This Grade J rating meets AEC-Q100 stress test requirements for automotive under-hood applications, unlike the I-grade (125°C) or E-grade (125°C) variants. Thermal design must ensure θJA and board copper area keep TJ ≤ 150°C under worst-case load and ambient conditions.
Does LT3756JMSE-2#PBF support both constant-current and constant-voltage regulation?
Yes, the LT3756JMSE-2#PBF supports dual regulation modes. Constant-current is set via high-side ISP/ISN sensing and CTRL pin programming; constant-voltage is implemented using the ground-referenced FB pin referenced to 1.25V. Both loops operate simultaneously, with priority given to current regulation unless an open-LED condition forces FB-based voltage control - a key safety feature built into the LT3756JMSE-2#PBF architecture.
How does the OPENLED pin function on LT3756JMSE-2#PBF?
The OPENLED pin on LT3756JMSE-2#PBF is an open-drain output that asserts (pulls low) when the FB voltage falls below VFB – 50mV, indicating an open LED string. It remains latched during PWM low periods and updates only when PWM goes high again. This behavior - enhanced in the LT3756-2 variant - ensures reliable fault capture even in pulsed-dimming operation, distinguishing LT3756JMSE-2#PBF from earlier LT3756 and LT3756-1 versions.
Can LT3756JMSE-2#PBF drive a buck-boost LED topology?
Yes, the LT3756JMSE-2#PBF explicitly supports buck-boost, boost, buck, SEPIC, and flyback topologies due to its high-side current sensing architecture (ISP/ISN inputs) and floating GATE driver. Unlike controllers requiring low-side sensing, LT3756JMSE-2#PBF decouples the LED string ground from the power switch source, enabling flexible layout and topology selection - a documented capability confirmed in the datasheet's Applications section and Typical Application circuits.
What is the purpose of the CTRL pin on LT3756JMSE-2#PBF?
The CTRL pin on LT3756JMSE-2#PBF adjusts the ISP–ISN current sense threshold from 0 mV to 100 mV. For 0 V < VCTRL < 1 V, the threshold scales linearly as (VCTRL – 0.1 V)/10; above 1.2 V, it holds at 100 mV full scale. This enables analog dimming, temperature compensation (e.g., via NTC to VREF), and dynamic current derating - all directly supported in the LT3756JMSE-2#PBF's electrical characteristics and pin function descriptions.
LT3756JMSE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- True Color PWM™
- 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:
- LED Lighting
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3756JMSE-2#PBF FAQ
1.How can I place an order for LT3756JMSE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756JMSE-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 LT3756JMSE-2#PBF reliable?
The price and inventory of LT3756JMSE-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 LT3756JMSE-2#PBF is usually 5 days.
3.What payment methods are accepted for LT3756JMSE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756JMSE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756JMSE-2#PBF?
LT3756JMSE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756JMSE-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 LT3756JMSE-2#PBF?
For technical support, including LT3756JMSE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756JMSE-2#PBF requirements.
6.How does Aetrix verify that LT3756JMSE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT3756JMSE-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 LT3756JMSE-2#PBF meets industry standards.
7.What is the process for return or replacement of LT3756JMSE-2#PBF?
All LT3756JMSE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756JMSE-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 LT3756JMSE-2#PBF part is unused and in its original packaging.
Return procedure for LT3756JMSE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3756JMSE-2#PBF Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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BCR420UW6-7
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