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Analog Devices Inc. LT3755JMSE-2#WTRPBF
- Part No.:
- LT3755JMSE-2#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3755JMSE-2#WTRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,497
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Product details
Overview
LT3755JMSE-2#WTRPBF from Analog Devices is a constant-frequency, current-mode DC/DC LED controller optimized for automotive-grade high-power LED drivers. It drives an external low-side N-channel MOSFET, supports 4.5V–40V input, delivers up to 75V output, features 100kHz–1MHz adjustable switching frequency, and provides true-color PWM dimming up to 3000:1 in boost/buck/buck-boost topologies.
For engineers reviewing the LT3755JMSE-2#WTRPBF datasheet, LT3755JMSE-2#WTRPBF pinout, LT3755JMSE-2#WTRPBF application, or LT3755JMSE-2#WTRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed AEC-Q100 qualification, and real-world design meaning for high-reliability LED headlamp and industrial lighting systems.
Technical Context
The LT3755JMSE-2#WTRPBF implements a fixed-frequency current-mode control architecture with internal 7.15V INTVCC regulator, ground-referenced FB pin for CV/CC dual-loop regulation, and high-side current sensing via ISP/ISN inputs. Its PWMOUT pin provides fault-driven LED disconnect capability, while OPENLED status reporting is enhanced versus earlier variants.
It integrates programmable soft-start, undervoltage lockout with hysteresis, open-LED protection with latched fault reporting, and short-circuit detection active below 3V ISN common-mode voltage. The CTRL pin enables analog dimming by scaling the 100mV current-sense threshold linearly up to 1V, then holding full-scale at >1.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide automotive battery range including cold-crank (4.5V) and load-dump transients (up to 40V) |
| Output Voltage Capability | Up to 75V - enables driving long LED strings in headlamp and signage applications |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor to balance efficiency, EMI, and magnetics size |
| Current Sense Threshold | 100mV nominal (95.5–103mV, J-grade) - sets LED current accuracy with minimal power loss in sense resistor |
| FB Regulation Voltage | 1.215V to 1.275V (J-grade) - defines precision voltage feedback point for CV operation or overvoltage protection |
| Operating Junction Temp | –40°C to +150°C - qualified per AEC-Q100 Grade J for under-hood automotive use |
| Shutdown Current | <1µA - enables ultra-low-power standby in always-on vehicle systems |
Pinout & Package
LT3755JMSE-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 thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output | Drives external NMOS disconnect switch; forced low during FB overvoltage (>VFB+60mV) to isolate LED load |
| FB (Pin 2) | Voltage feedback input | Regulates output voltage to 1.25V nominal; triggers OPENLED pull-down when <VFB−50mV (open-LED detection) |
| ISN (Pin 3) | Negative current sense input | High-side current sensing node; enables short-circuit detection when ISN <3V and |ISP−ISN| >150mV |
| ISP (Pin 4) | Positive current sense input | High-side current sensing node; bias current varies with CTRL voltage; part of differential sense pair |
| VC (Pin 5) | Error amplifier output | Integrates error signal for loop stability; high-impedance during PWM low to retain state across dimming cycles |
| CTRL (Pin 6) | Analog dimming control | Scales current-sense threshold from 0 to 100mV (0–1.1V input); enables precise analog brightness control |
| 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 input | Active-high enable; controls switching and resets VC storage; internal pull-down allows direct MCU connection |
| OPENLED (Pin 9) | Open-LED fault indicator | Open-collector output asserted when FB < VFB−50mV; latched during PWM low; re-asserted after FB drops below overvoltage threshold (LT3755-2 feature) |
| SS (Pin 10) | Soft-start timing | 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 oscillator frequency; 100kΩ = ~375kHz; supports 100kHz–1MHz range |
| SHDN/UVLO (Pin 12) | Enable & undervoltage detect | 1.159V falling threshold (J-grade); 20mV hysteresis; sub-µA bias above threshold; enables shutdown & UVLO |
| INTVCC (Pin 13) | Internal LDO output | 7.15V regulated supply (±150mV) for gate driver and logic; requires 4.7µF local ceramic bypass |
| VIN (Pin 14) | Main input supply | Accepts 4.5V–40V; powers INTVCC LDO and internal circuitry; requires ≥0.22µF local bypass |
| SENSE (Pin 15) | Low-side current sense | Kelvin-connected to FET source; monitors switch current for slope-compensated current-mode control |
| GATE (Pin 16) | NMOS gate driver | Drives external low-side FET between INTVCC and GND; clamped to GND during shutdown/fault |
| Exposed Pad (Pin 17) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane for thermal dissipation and current-sense return path |
Key Features
| Feature | Design Value |
|---|---|
| True-color PWM dimming | 3000:1 ratio enabled by dedicated PWM input and synchronized gate control-preserves LED color consistency across full brightness range |
| AEC-Q100 Grade J qualification | Validated for −40°C to +150°C operation-meets automotive reliability requirements for under-hood LED headlamp drivers |
| Enhanced OPENLED status logic | LT3755-2-specific latched fault reporting with automatic re-assertion after overvoltage recovery-reduces false fault alarms in transient conditions |
| High-side current sensing | ISP/ISN differential inputs support boost, buck, buck-boost, SEPIC, and flyback topologies-maximizes design flexibility without ground-loop compromises |
| Programmable soft-start | External capacitor on SS pin controls startup dI/dt and inrush-prevents input voltage sag and protects external FET during power-up |
Applications
| Automotive LED Headlamps | Industrial High-Bay Lighting |
|---|---|
Use Scenario: 50W white LED headlamp module operating from 8V–16V vehicle battery with dynamic load-dump immunity. IC Role / Device Role / Timing Role: Constant-current LED controller managing boost topology with high-side current sensing and open-LED fault reporting. Use Value: AEC-Q100 Grade J rating ensures reliable operation at 150°C junction temperature; 3000:1 PWM dimming enables adaptive driving beam control without color shift. | Use Scenario: 100W high-bay fixture using 32V LED string powered from 24V industrial DC bus with surge protection. IC Role / Device Role / Timing Role: Buck-mode LED driver with analog dimming via CTRL pin and programmable frequency for EMI compliance. Use Value: Adjustable 100kHz–1MHz switching frequency allows optimization for low-noise operation in factory environments; 75V output headroom accommodates long LED chains. |
| UV-C Sterilization Systems | Stage & Architectural LED Fixtures |
Use Scenario: Pulsed UV-C LED array (275nm) requiring precise current regulation and fast on/off switching for germicidal duty cycles. IC Role / Device Role / Timing Role: High-frequency current-mode controller enabling microsecond-level PWM edge control and accurate peak current limiting. Use Value: 100mV current-sense threshold minimizes power loss in sense resistor; fast gate driver (35ns rise/fall) supports high-duty-cycle pulsing without thermal runaway. | Use Scenario: RGBW tunable architectural fixture with independent channel dimming and thermal derating based on ambient temperature. IC Role / Device Role / Timing Role: Multi-channel LED driver IC using VREF output to feed temperature-compensated CTRL dividers per channel. Use Value: Stable 2.0V VREF (±2%) enables accurate analog dimming across temperature; FB pin supports auxiliary CV monitoring for safety-critical overvoltage cutoff. |
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#WTRPBF | Higher 60V ISP/ISN rating (vs 75V), identical pinout and control architecture; adds spread-spectrum frequency modulation | Better EMI performance in noise-sensitive environments; same AEC-Q100 Grade I temp range (−40°C to +125°C) | Select when EMI compliance is critical and 125°C max junction suffices; not suitable for 150°C under-hood placement |
| LM3410XMY/NOPB | Single-stage boost-only controller; no high-side sensing, no OPENLED, lower 36V VIN max, no AEC-Q100 qualification | Limited to low-power (<15W), non-automotive, cost-sensitive applications; lacks fault reporting and multi-topology support | Choose only for simple, low-cost boost LED drivers where automotive qualification and topology flexibility are unnecessary |
Compared with LT3755JMSE-2#WTRPBF, LT3756IMSE-2#WTRPBF offers superior EMI control but sacrifices 25°C of junction temperature margin, while LM3410XMY/NOPB provides basic functionality at lower cost but omits critical automotive and protection features required for robust high-power designs.
Availability
LT3755JMSE-2#WTRPBF is available at Aetrix Electronics and suitable for automotive LED headlamps, industrial high-bay lighting, and UV-C sterilization systems requiring stable component supply, AEC-Q100 compliance, and extended temperature operation.
Supply support for LT3755JMSE-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.
The LT3755 family was designed specifically for high-reliability, high-power LED driver applications demanding wide input range, flexible topology support, and automotive-grade robustness-LT3755JMSE-2#WTRPBF extends that with Grade J qualification and enhanced OPENLED behavior.
FAQ
What is the maximum junction temperature rating for LT3755JMSE-2#WTRPBF?
The LT3755JMSE-2#WTRPBF is rated for operation from –40°C to +150°C junction temperature and is qualified per AEC-Q100 Grade J. This makes it suitable for under-hood automotive applications where ambient temperatures exceed 125°C. Thermal derating guidelines apply above 125°C to ensure long-term reliability, and the exposed pad must be soldered to a sufficient copper area for effective heat dissipation.
How does the OPENLED pin behavior differ on LT3755JMSE-2#WTRPBF versus earlier versions?
The LT3755JMSE-2#WTRPBF implements improved OPENLED status logic: when FB falls below the overvoltage threshold (VFB+60mV) and remains above the OPENLED threshold (VFB−50mV), the OPENLED pull-down is automatically re-asserted. Earlier LT3755 and LT3755-1 variants require FB to drop below both thresholds before re-assertion, making LT3755JMSE-2#WTRPBF more responsive to intermittent open-LED faults in dynamic lighting systems.
Can LT3755JMSE-2#WTRPBF operate in buck mode with high-side current sensing?
Yes - LT3755JMSE-2#WTRPBF supports buck, boost, buck-boost, SEPIC, and flyback topologies using high-side current sensing via the ISP and ISN pins. In buck configuration, the LED string connects between input and switch node, with ISP/ISN placed across a sense resistor on the high side of the LED string. This preserves ground-referenced control and avoids ground-loop issues common in low-side sensing.
What is the purpose of the CTRL pin on LT3755JMSE-2#WTRPBF, and how is it used?
The CTRL pin on LT3755JMSE-2#WTRPBF adjusts the current-sense threshold from 0mV to 100mV: for 0V < VCTRL < 1V, threshold = 0.1 × VCTRL; above 1.2V, it holds at 100mV. This enables precise analog dimming or temperature-based current derating. A resistor divider from VREF (2.0V) to GND is commonly used, allowing smooth brightness control or thermal foldback without PWM artifacts.
Is LT3755JMSE-2#WTRPBF pin-compatible with other LT3755 variants in the MSOP package?
Yes - all LT3755-xMSE variants (including LT3755EMSE-2#WTRPBF, LT3755IMSE-2#WTRPBF, and LT3755JMSE-2#WTRPBF) share identical 16-lead MSOP pinouts and footprint. The J-grade variant differs only in guaranteed temperature range (–40°C to +150°C) and tighter FB/VREF tolerances; no layout changes are needed when upgrading from I- or E-grade to J-grade for higher thermal margin.
LT3755JMSE-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):
- 4.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3755JMSE-2#WTRPBF FAQ
1.How can I place an order for LT3755JMSE-2#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3755JMSE-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 LT3755JMSE-2#WTRPBF reliable?
The price and inventory of LT3755JMSE-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 LT3755JMSE-2#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT3755JMSE-2#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3755JMSE-2#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3755JMSE-2#WTRPBF?
LT3755JMSE-2#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3755JMSE-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 LT3755JMSE-2#WTRPBF?
For technical support, including LT3755JMSE-2#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3755JMSE-2#WTRPBF requirements.
6.How does Aetrix verify that LT3755JMSE-2#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT3755JMSE-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 LT3755JMSE-2#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT3755JMSE-2#WTRPBF?
All LT3755JMSE-2#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3755JMSE-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 LT3755JMSE-2#WTRPBF part is unused and in its original packaging.
Return procedure for LT3755JMSE-2#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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