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Analog Devices Inc. LT3756JMSE-2#WPBF
- Part No.:
- LT3756JMSE-2#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756JMSE-2#WPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,128
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Product details
Overview
LT3756JMSE-2#WPBF from Analog Devices is a high-voltage, constant-current LED controller 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 headlamp drivers and industrial lighting.
For engineers reviewing the LT3756JMSE-2#WPBF datasheet, LT3756JMSE-2#WPBF pinout, LT3756JMSE-2#WPBF application, or LT3756JMSE-2#WPBF equivalent, key selection criteria include its AEC-Q100 qualification, –40°C to +150°C junction temperature rating, open LED protection via OPENLED pin, adjustable 100kHz–1MHz switching frequency, and dual-loop (constant-current/constant-voltage) regulation capability.
Technical Context
The LT3756JMSE-2#WPBF implements fixed-frequency current-mode control with internal 7.15V INTVCC regulator, enabling stable operation across wide VIN (6V–100V) and VOUT (up to 100V) ranges. Its high-side ISP/ISN current sensing architecture supports flexible topology selection - including boost, buck, buck-boost, SEPIC, and flyback - without requiring ground-referenced LED strings.
It integrates dual feedback loops: one for LED current regulation (via ISP–ISN differential voltage referenced to CTRL pin), and another for voltage regulation (via FB pin at 1.25V nominal). The LT3756-2 variant adds improved OPENLED status reporting behavior versus LT3756/LT3756-1, with re-assertion logic after overvoltage recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports 12V/24V/48V systems with 100V transient tolerance for automotive cold-crank and load-dump immunity. |
| Output Voltage Capability | Up to 100V - enables driving long LED strings (e.g., >30 white LEDs in series) without cascading converters. |
| Current Sense Threshold | 100mV (typical) at ISP–ISN - enables precise, low-loss current regulation using standard 0.1Ω or lower sense resistors. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor; higher frequencies reduce inductor size but increase switching losses. |
| Operating Junction Temp | –40°C to +150°C - J-grade rating ensures reliability in under-hood automotive environments and high-power industrial enclosures. |
| Dimming Ratio | 3000:1 true-color PWM dimming - preserves LED chromaticity across full brightness range for premium lighting systems. |
| Protection Features | Open LED detection (via FB–50mV threshold), short-circuit detection (ISP–ISN >150mV), undervoltage lockout with hysteresis, thermal shutdown. |
Pinout & Package
LT3756JMSE-2#WPBF uses a thermally enhanced 16-lead plastic MSOP package (3mm × 4.9mm) with exposed pad (Pin 17 = GND) soldered to PCB for thermal management. θJA = 43°C/W, θJC = 4°C/W. Maximum junction temperature is 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output / Overvoltage fault signal | Drives external NMOS disconnect switch; pulled low when FB exceeds VFB +60mV to protect LEDs from overcurrent. |
| FB (Pin 2) | Voltage feedback input | Ground-referenced input for CV regulation or open-LED detection; regulated to 1.25V (J-grade: 1.215–1.275V). |
| ISN (Pin 3) | Negative current sense input | Connects to low side of high-side sense resistor; enables current regulation and short-circuit detection below 3V common mode. |
| ISP (Pin 4) | Positive current sense input | Connects to high side of sense resistor; bias current varies with CTRL voltage; participates in short-circuit detection. |
| VC (Pin 5) | Error amplifier output | High-impedance compensation node; stores demand state during PWM low; requires RC network for loop stability. |
| CTRL (Pin 6) | Current threshold adjustment | Sets ISP–ISN regulation point: 100mV when VCTRL ≥1.2V; linearly scaled below 1V (e.g., 50mV at 0.6V). |
| VREF (Pin 7) | 2.00V reference output | Stable 2.00V (J-grade: 1.965–2.045V) reference; supplies bias for CTRL divider or temperature compensation networks. |
| PWM (Pin 8) | Digital dimming input | Active-high enable; internal pull-down; controls PWM dimming ratio up to 3000:1; resets soft-start on rising edge. |
| OPENLED (Pin 9) | Open LED status output | Open-collector pull-down asserted when FB < VFB –50mV; latched during PWM low; re-asserted post-overvoltage recovery (LT3756-2 only). |
| SS (Pin 10) | Soft-start timing input | 10µA internal pull-up to 2.5V rail; external capacitor sets startup ramp time; reset by UVLO or thermal fault. |
| RT (Pin 11) | Frequency programming input | Resistor-to-GND sets oscillator frequency (100kHz–1MHz); RT = 100kΩ yields ~375kHz typical. |
| SHDN/UVLO (Pin 12) | Shutdown & input UVLO input | Falling threshold = 1.159V (J-grade); hysteresis enabled by 2.1µA internal pull-down; disables IC below threshold. |
| INTVCC (Pin 13) | Internal LDO output | 7.15V (6.9–7.3V) regulated supply for gate driver and logic; requires 4.7µF local ceramic bypass; current-limited to 14–23mA. |
| VIN (Pin 14) | Main power input | Accepts 6V–100V; must be locally bypassed with ≥0.22µF ceramic capacitor near pin; powers INTVCC LDO. |
| SENSE (Pin 15) | Switch current sense input | Kelvin-connected to source of external N-MOSFET; monitors peak switch current; clamped at 108mV (typ) for overcurrent protection. |
| GATE (Pin 16) | N-MOSFET gate driver output | Drives external FET gate between INTVCC and GND; rise/fall time ≤35ns (CL = 3300pF); disabled during shutdown/fault. |
| GND (Pin 17) | Power & signal ground | Exposed pad must be soldered to PCB ground plane; serves as return for SENSE, ISN, and internal circuits; critical for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified (Grade 0) | Validated for automotive under-hood use with guaranteed operation from –40°C to +150°C junction temperature. |
| High-side current sensing | Enables topology flexibility - boost, buck, buck-boost, SEPIC, flyback - without grounding the LED string. |
| Improved OPENLED status logic | LT3756-2 re-asserts OPENLED after FB falls below overvoltage threshold while remaining above open-LED threshold. |
| Programmable 100kHz–1MHz switching | RT resistor allows optimization of magnetic size vs. efficiency; supports compact designs with minimal EMI filtering. |
| Dual-loop regulation | Simultaneous constant-current (ISP–ISN) and constant-voltage (FB) control enables robust LED protection and system-level voltage compliance. |
| Low shutdown current | <1µA shutdown IQ enables always-on automotive modules (e.g., daytime running lights) with negligible battery drain. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Adaptive front-lighting system (AFS) with matrix LED arrays requiring precise current control and fast PWM dimming. IC Role / Device Role / Timing Role: Constant-current LED controller managing individual LED segments; provides 3000:1 PWM dimming and open-circuit fault signaling. Use Value: Enables dynamic beam shaping and glare-free illumination while meeting ISO 11452-2 EMC and AEC-Q100 reliability requirements. |
Use Scenario: 100W+ LED fixtures for warehouse or factory floor lighting operating from 24VDC or 48VDC industrial rails. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating high-current LED strings in buck-boost configuration for wide input voltage tolerance. Use Value: Delivers >94% efficiency at 30W output and supports programmable UVLO hysteresis for brown-out resilience in unstable plant power. |
| Streetlight Drivers | UV-C Disinfection Systems |
|
Use Scenario: Outdoor LED streetlights powered by solar-charged batteries or PoE++ infrastructure with wide VIN variation. IC Role / Device Role / Timing Role: High-voltage boost controller driving 40–60V LED strings; uses high-side sensing to isolate LED cathode from ground. Use Value: Eliminates need for isolated gate drivers; simplifies layout and improves reliability in humid, high-voltage outdoor environments. |
Use Scenario: Pulsed UV-C LED arrays for surface disinfection requiring precise current pulses and thermal derating control. IC Role / Device Role / Timing Role: Current-regulated pulsed driver with analog dimming (CTRL) and digital PWM for duty-cycle control. Use Value: Maintains consistent UV photon output across temperature drift; integrated short-circuit protection safeguards expensive UV LEDs. |
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#WPBF | I-grade (-40°C to +125°C), same pinout and electrical specs except lower max junction temperature. | Suitable for non-under-hood automotive or industrial applications where ambient temperature remains below 125°C. | Select LT3756IMSE-2#WPBF if thermal margin allows and cost sensitivity favors I-grade qualification. |
| LT3756HMSE-2#WPBF | H-grade (-40°C to +150°C), identical thermal spec to J-grade but with different process qualification and test screening. | Approved for automotive use but lacks J-grade's extended reliability testing per AEC-Q100 Grade 0. | Choose LT3756HMSE-2#WPBF when AEC-Q100 Grade 0 is not mandated but 150°C operation is required. |
Compared with LT3756IMSE-2#WPBF, the LT3756JMSE-2#WPBF offers extended reliability validation for Grade 0 automotive use; compared with LT3756HMSE-2#WPBF, it provides tighter parametric limits and enhanced lifetime testing - critical for safety-critical headlamp systems.
Availability
LT3756JMSE-2#WPBF is available at Aetrix Electronics and suitable for automotive headlamp drivers, industrial high-bay lighting, outdoor streetlight systems, and UV-C disinfection equipment requiring stable component supply with AEC-Q100 compliance and extended temperature operation.
Supply support for LT3756JMSE-2#WPBF 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 family was designed specifically for high-reliability, high-voltage LED driver applications - emphasizing automotive-grade robustness, flexible topology support, and precision current regulation in harsh environments.
FAQ
What is the maximum operating junction temperature for LT3756JMSE-2#WPBF?
The LT3756JMSE-2#WPBF is rated for a maximum junction temperature of +150°C, confirmed by its J-grade qualification and specified operating range of –40°C to +150°C. This rating is validated per AEC-Q100 Grade 0 requirements and supported by thermal metrics θJA = 43°C/W and θJC = 4°C/W. Proper PCB thermal design - especially soldering the exposed pad to a large ground plane - is essential to maintain this rating in continuous operation.
How does the OPENLED functionality differ in LT3756JMSE-2#WPBF versus earlier variants?
The LT3756JMSE-2#WPBF implements the LT3756-2 variant's improved OPENLED logic: it re-asserts the OPENLED pull-down after FB falls below the overvoltage threshold (VFB +60mV) while remaining above the open-LED threshold (VFB –50mV). In contrast, the base LT3756 holds OPENLED de-asserted until FB drops below both thresholds. This behavior enables faster fault recovery and more accurate open-LED status reporting in transient overvoltage conditions.
Can LT3756JMSE-2#WPBF operate in buck mode with an input voltage lower than the LED string voltage?
No - the LT3756JMSE-2#WPBF cannot regulate LED current in buck mode when VIN is lower than the forward voltage of the LED string. As a controller (not a converter), it requires external power stage components. In buck configuration, VIN must exceed the sum of LED string VF plus diode drop and sense resistor loss. For step-down applications with VIN < VLED, boost or buck-boost topologies are required - both fully supported by LT3756JMSE-2#WPBF's high-side sensing and dual-loop architecture.
What is the purpose of the CTRL pin on LT3756JMSE-2#WPBF, and how is it typically used?
The CTRL pin on LT3756JMSE-2#WPBF adjusts the ISP–ISN current sense threshold from 0mV to 100mV. When VCTRL ≥1.2V, the threshold is fixed at 100mV for full-scale current regulation. Below 1V, it scales linearly (e.g., 50mV at 0.6V), enabling analog dimming or temperature compensation. It is commonly driven by a resistor divider from VREF (2.00V) or an external DAC. Leaving CTRL unconnected is not allowed - it must be tied to a defined voltage.
Is LT3756JMSE-2#WPBF pin-compatible with LT3756EMSE-2#WPBF?
Yes - LT3756JMSE-2#WPBF is pin-compatible with all other MSOP-packaged LT3756-2 variants, including LT3756EMSE-2#WPBF and LT3756IMSE-2#WPBF. All share identical 16-lead MSOP footprint, pin numbering, electrical interface, and functional block diagram. The only differences are temperature grade (J-grade = –40°C to +150°C), AEC-Q100 qualification level, and minor parametric limits (e.g., VREF tolerance tightened for J-grade).
LT3756JMSE-2#WPBF 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:
- 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#WPBF FAQ
1.How can I place an order for LT3756JMSE-2#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756JMSE-2#WPBF 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#WPBF reliable?
The price and inventory of LT3756JMSE-2#WPBF 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#WPBF is usually 5 days.
3.What payment methods are accepted for LT3756JMSE-2#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756JMSE-2#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756JMSE-2#WPBF?
LT3756JMSE-2#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756JMSE-2#WPBF 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#WPBF?
For technical support, including LT3756JMSE-2#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756JMSE-2#WPBF requirements.
6.How does Aetrix verify that LT3756JMSE-2#WPBF is sourced from the original manufacturer or authorized distributors?
All LT3756JMSE-2#WPBF 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#WPBF meets industry standards.
7.What is the process for return or replacement of LT3756JMSE-2#WPBF?
All LT3756JMSE-2#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756JMSE-2#WPBF, 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#WPBF part is unused and in its original packaging.
Return procedure for LT3756JMSE-2#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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