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Analog Devices Inc. LT3756JMSE-2#WTRPBF
- Part No.:
- LT3756JMSE-2#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756JMSE-2#WTRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,993
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Product details
Overview
LT3756JMSE-2#WTRPBF from Analog Devices is a high-voltage, constant-current LED controller optimized for automotive-grade high-power lighting. It operates from 6V to 100V input, delivers up to 100V output, supports 3000:1 PWM dimming, and features high-side current sensing for boost/buck/buck-boost topologies - deployed in white LED headlamp drivers achieving 94% efficiency at 30W.
For engineers reviewing the LT3756JMSE-2#WTRPBF datasheet, LT3756JMSE-2#WTRPBF pinout, LT3756JMSE-2#WTRPBF application, or LT3756JMSE-2#WTRPBF equivalent, key selection considerations include its AEC-Q100 qualification, J-grade (–40°C to +150°C) thermal rating, 100mV high-side current sense threshold, open LED protection via OPENLED pin, and programmable 100kHz–1MHz switching frequency.
Technical Context
The LT3756JMSE-2#WTRPBF implements fixed-frequency current-mode control with an internal 7.15V regulated INTVCC supply driving an N-channel MOSFET gate. Its dual-loop architecture simultaneously regulates LED current via ISP/ISN differential sensing and supports constant-voltage operation through FB feedback referenced to 1.25V.
It integrates dedicated protection logic: OPENLED asserts on FB < 1.20V (–4% of VFB), PWMOUT forces low on FB > 1.31V (+5% of VFB), and short-circuit detection activates when ISP–ISN > 150mV below 3V common-mode voltage - all validated across its full –40°C to +150°C junction range.
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 long LED strings in headlamps and industrial lighting without cascading stages. |
| Current Sense Threshold | 100mV (typical) at ISP–ISN - enables precise, low-loss high-side sensing with minimal resistor power dissipation. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor to balance efficiency, EMI, and magnetic size. |
| Operating Junction Temp | –40°C to +150°C - J-grade rating ensures reliability in under-hood automotive environments. |
| Dimming Ratio | 3000:1 true-color PWM - preserves LED chromaticity across full brightness range without color shift. |
| AEC-Q100 Qualification | Qualified per Grade 0 - meets automotive stress testing requirements for mission-critical lighting systems. |
Pinout & Package
LT3756JMSE-2#WTRPBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4.9mm) with exposed pad (Pin 17) soldered to PCB ground for optimal thermal performance (θJA = 43°C/W, θJC = 4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output / Overvoltage fault signal | Drives external NMOS disconnect switch; pulled low if FB exceeds 1.31V to isolate LED string during overvoltage events. |
| FB (Pin 2) | Voltage loop feedback input | Regulates to 1.25V nominal; enables CV mode and triggers OPENLED assertion when < 1.20V (open LED detection). |
| ISN (Pin 3) | Negative current sense input | High-side current sense return; bias current < 25µA; enables short-circuit detection below 3V common-mode. |
| ISP (Pin 4) | Positive current sense input | High-side current sense input; combined ISP/ISN bias < 55µA; used with CTRL to scale current threshold. |
| VC (Pin 5) | Error amplifier output | High-impedance during PWM low; stores demand state; requires RC compensation network for loop stability. |
| CTRL (Pin 6) | Current threshold programming | Sets ISP–ISN threshold from 0–100mV linearly (0–1V) then clamps at 100mV (>1.2V); enables analog dimming. |
| VREF (Pin 7) | 2.00V reference output | Stable 2V source (±1.75%) for CTRL divider or temperature compensation networks; supplies ≤100µA. |
| PWM (Pin 8) | Digital dimming enable | Active-high; internal pull-down; disables switching and idles oscillator when low; synchronizes PWMOUT. |
| OPENLED (Pin 9) | Open LED status indicator | Open-collector output; pulls down when FB < 1.20V; latched during PWM low; reasserts after FB recovers (LT3756-2 behavior). |
| SS (Pin 10) | Soft-start timing control | 10µA internal pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO or thermal fault. |
| RT (Pin 11) | Frequency programming | Resistor-to-GND sets switching frequency (100kΩ → ~100kHz; 10kΩ → ~1MHz); no internal pull-up/down. |
| SHDN/UVLO (Pin 12) | Shutdown & input undervoltage detect | 1.22V falling threshold with 20mV hysteresis; 2.1µA pull-down enables programmable hysteresis via external divider. |
| INTVCC (Pin 13) | Internal LDO output (7.15V) | Supplies gate driver and logic; requires 4.7µF local ceramic bypass; shuts down if < 4.1V to protect external FET. |
| VIN (Pin 14) | Main power input | Accepts 6–100V; must be bypassed with ≥0.22µF ceramic capacitor near pin; powers INTVCC LDO. |
| SENSE (Pin 15) | Low-side switch current sense | Kelvin-connected to source of external N-MOSFET; monitors peak switch current for current-mode control. |
| GATE (Pin 16) | N-MOSFET gate driver | Drives external FET between INTVCC and GND; high-Z during shutdown/fault; 35ns rise/fall into 3.3nF. |
| GND (Pin 17) | Power & signal ground | Exposed thermal pad; connects to PCB ground plane; serves as SENSE return and current sense reference. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables flexible topology selection (boost/buck/buck-boost/SEPIC/flyback) without ground-referenced LED constraints. |
| Programmable open LED detection | OPENLED pin asserts when FB drops below 1.20V (–4% of 1.25V), providing fail-safe status for disconnected loads. |
| Integrated overvoltage protection | PWMOUT forces low if FB exceeds 1.31V (+5%), isolating LEDs before overcurrent damage occurs. |
| Automotive-grade thermal rating | J-grade operation up to +150°C junction temperature ensures robustness in engine compartment deployments. |
| True-color PWM dimming | 3000:1 dimming ratio preserves LED spectral integrity - critical for automotive adaptive front-lighting systems (AFS). |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 30W white LED arrays in vehicle forward lighting with transient immunity and thermal resilience. IC Role / Device Role / Timing Role: Constant-current controller managing high-side sensing, PWM dimming, and open-circuit fault signaling. Use Value: Achieves 94% efficiency at 30W while meeting AEC-Q100 Grade 0 and surviving 100V load-dump transients. |
Use Scenario: Powering multi-string 100V LED fixtures in warehouse ceilings with long cable runs and variable line voltage. IC Role / Device Role / Timing Role: High-voltage boost controller regulating current across varying input (12–48V DC) and output (up to 100V) conditions. Use Value: Enables single-stage architecture eliminating intermediate converters - reducing BOM cost and improving system MTBF. |
| UV-C Disinfection Module | Stage & Architectural Accent Lighting |
|
Use Scenario: Driving high-current UV-C LEDs requiring precise current regulation and rapid thermal response in portable sterilization units. IC Role / Device Role / Timing Role: Current-mode controller with fast transient response and programmable soft-start to prevent inrush stress on fragile UV LEDs. Use Value: Maintains ±2% current accuracy over –40°C to +150°C, ensuring consistent germicidal irradiance despite ambient shifts. |
Use Scenario: Dimmable RGBW architectural lighting where color fidelity and flicker-free operation are mandatory. IC Role / Device Role / Timing Role: PWM dimming controller synchronized with building management systems via external clock or analog CTRL input. Use Value: Delivers 3000:1 true-color PWM dimming without hue shift - preserving designer-intended chromaticity at all brightness levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | Fixed 200kHz–2MHz frequency; no OPENLED pin; lower max VIN (60V); non-AEC-Q100. | Suitable for industrial LED drivers where automotive qualification and open-LED reporting are not required. | Select LTC3783EFE#PBF only for cost-sensitive non-automotive designs needing higher frequency flexibility but sacrificing fault visibility. |
| LM3410XSDX/NOPB | Single-ended boost-only; max VIN 42V; no high-side sensing; no programmable dimming; no AEC-Q100. | Targeted at low-power (<5W), non-automotive portable LED applications with simple topology needs. | Choose LM3410XSDX/NOPB only for compact, low-cost consumer lighting where 100V capability and diagnostic features are unnecessary. |
Compared with LTC3783EFE#PBF and LM3410XSDX/NOPB, LT3756JMSE-2#WTRPBF uniquely combines AEC-Q100 qualification, 100V operation, high-side sensing, and integrated OPENLED/PWMOUT fault signaling - making it the sole choice for safety-critical automotive LED systems requiring full diagnostics and thermal resilience.
Availability
LT3756JMSE-2#WTRPBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-bay lighting, UV-C disinfection modules, and architectural accent lighting requiring stable component supply with guaranteed long-term availability.
Supply support for LT3756JMSE-2#WTRPBF 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets since 1965.
The LT3756 family is designed specifically for high-reliability, high-voltage LED current regulation in demanding environments - emphasizing AEC-Q100 compliance, wide input/output ranges, and integrated fault protection for automotive lighting systems.
FAQ
What is the maximum operating junction temperature for LT3756JMSE-2#WTRPBF?
The LT3756JMSE-2#WTRPBF is rated for a maximum junction temperature of +150°C, confirmed by its J-grade qualification and thermal specifications in the official Analog Devices datasheet Rev. C. This rating enables deployment in under-hood automotive locations where ambient temperatures exceed 125°C. The device incorporates overtemperature protection that temporarily suspends switching above this limit to preserve reliability. All electrical characteristics in the datasheet are guaranteed across the full –40°C to +150°C range.
Does LT3756JMSE-2#WTRPBF support both constant-current and constant-voltage regulation?
Yes, LT3756JMSE-2#WTRPBF supports dual-loop regulation: constant-current via ISP/ISN differential sensing (with CTRL-adjustable threshold) and constant-voltage via FB feedback referenced to 1.25V. The two loops interact - the current loop dominates during normal LED operation, while the voltage loop activates during open-circuit faults. Connecting FB to GND disables CV mode; tying ISP/ISN together and CTRL to VREF disables CC mode. This flexibility allows use in LED drivers and battery charging applications.
How does the OPENLED pin function on LT3756JMSE-2#WTRPBF?
The OPENLED pin on LT3756JMSE-2#WTRPBF is an open-collector output that asserts (pulls low) when the FB voltage falls below 1.20V - indicating an open LED string. It remains latched during PWM low periods and updates upon next PWM high transition. Unlike the base LT3756, the LT3756-2 variant reasserts OPENLED once FB recovers above the open-LED threshold but stays below the overvoltage threshold (1.31V), enabling more responsive fault recovery. An external pull-up resistor < 1mA is required.
What is the purpose of the CTRL pin on LT3756JMSE-2#WTRPBF?
The CTRL pin on LT3756JMSE-2#WTRPBF programs the ISP–ISN current sense threshold: from 0–100mV linearly as VCTRL rises from 0–1V, then clamping at 100mV for VCTRL > 1.2V. This enables analog dimming by varying CTRL voltage, complements PWM dimming, and supports temperature compensation when driven from a thermistor-based divider off VREF. Leaving CTRL unconnected risks undefined current regulation; it must be tied to a defined voltage or VREF.
Is LT3756JMSE-2#WTRPBF pin-compatible with other LT3756 variants?
Yes, LT3756JMSE-2#WTRPBF shares identical pinout and footprint with all LT3756-x variants in the MSOP-16 package, including LT3756EMSE-2#PBF and LT3756HMSE-2#PBF. Differences lie solely in temperature grade (J-grade = –40°C to +150°C), AEC-Q100 qualification (present in #W suffix parts), and minor parameter tolerances - not pin function or assignment. No PCB redesign is needed when upgrading from E/I/H to J-grade within the -2 family.
LT3756JMSE-2#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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:
- 2.9V ~ 100V
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- LED Lighting
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3756JMSE-2#WTRPBF FAQ
1.How can I place an order for LT3756JMSE-2#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756JMSE-2#WTRPBF 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#WTRPBF reliable?
The price and inventory of LT3756JMSE-2#WTRPBF 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#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT3756JMSE-2#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756JMSE-2#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756JMSE-2#WTRPBF?
LT3756JMSE-2#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756JMSE-2#WTRPBF 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#WTRPBF?
For technical support, including LT3756JMSE-2#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756JMSE-2#WTRPBF requirements.
6.How does Aetrix verify that LT3756JMSE-2#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT3756JMSE-2#WTRPBF 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#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT3756JMSE-2#WTRPBF?
All LT3756JMSE-2#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756JMSE-2#WTRPBF, 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#WTRPBF part is unused and in its original packaging.
Return procedure for LT3756JMSE-2#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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