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Analog Devices Inc. LT3756JMSE-2#TRPBF
- Part No.:
- LT3756JMSE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756JMSE-2#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,391
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Product details
Overview
LT3756JMSE-2#TRPBF 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#TRPBF datasheet, LT3756JMSE-2#TRPBF pinout, LT3756JMSE-2#TRPBF application, or LT3756JMSE-2#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 100mV high-side current sense threshold, –40°C to 150°C junction temperature range, programmable 100kHz–1MHz switching frequency, and improved OPENLED status reporting specific to the -2 variant.
Technical Context
The LT3756JMSE-2#TRPBF implements fixed-frequency current-mode control with an internal 7.15V regulated INTVCC supply for gate driving. Its error amplifier (VC) regulates either LED current via ISP/ISN differential sensing or output voltage via FB, with dual-loop interaction managed by transconductance amplifiers and dedicated comparators.
It integrates open-LED detection (FB < VFB – 50mV), overvoltage protection (FB > VFB + 60mV), short-circuit detection (ISP–ISN > 150mV at low common-mode), and programmable soft-start via SS pin. The LT3756-2 variant adds enhanced OPENLED latching behavior during PWM idle states and reassertion logic after overvoltage recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide automotive battery transients including 100V load-dump events. |
| Output Voltage Capability | Up to 100V - enables single-stage boost for high-string-count LED arrays without cascaded stages. |
| Current Sense Threshold | 100mV nominal (J-grade: 95.5–103mV) - sets LED current ILED = 100mV/RSENSE, minimizing power loss in sense resistor. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT pin resistor; higher frequencies reduce inductor size but increase switching losses. |
| Operating Junction Temp | –40°C to +150°C - J-grade rating ensures functionality 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 (–40°C to +150°C) - meets automotive reliability and stress-test requirements for safety-critical lighting. |
Pinout & Package
LT3756JMSE-2#TRPBF is housed in a thermally enhanced 16-lead MSOP package (3mm × 4.9mm) with exposed GND pad (Pin 17) requiring PCB soldering for thermal and electrical integrity. θJA = 43°C/W, θJC = 4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output / Overvoltage fault indicator | Drives LED disconnect FET; pulled low when FB exceeds VFB + 60mV to isolate load and prevent LED overcurrent. |
| FB (Pin 2) | Voltage feedback input | Regulates output voltage to 1.25V (J-grade: 1.215–1.275V); also triggers OPENLED when below VFB – 50mV for open-circuit detection. |
| ISN (Pin 3) | Negative current sense input | High-side current sense return; bias current ≤25µA; enables short-circuit detection when ISP–ISN > 150mV and VISN < 3V. |
| ISP (Pin 4) | Positive current sense input | High-side current sense input; common-mode range 2.9V–100V; bias current varies with CTRL voltage (≤55µA). |
| VC (Pin 5) | Error amplifier output | Integrates ISP–ISN vs. CTRL-set threshold; high-impedance during PWM low to retain state for next cycle. |
| CTRL (Pin 6) | Current threshold programming | Sets ISP–ISN regulation point: linearly scales from 0–100mV (0V < VCTRL < 1V), then clamps at 100mV above 1.2V. |
| VREF (Pin 7) | 2.00V reference output | Stable 2.00V (J-grade: 1.965–2.045V) reference; supplies ≤100µA for CTRL divider or thermal compensation networks. |
| PWM (Pin 8) | Primary dimming control | Active-high digital dimming input; internal pull-down; forces GATE/PWMOUT low and disables oscillator when low. |
| OPENLED (Pin 9) | Open-LED status output | Open-collector pull-down asserted when FB < VFB – 50mV; latched during PWM idle and reasserted post-overvoltage on LT3756-2. |
| 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 (100kHz–1MHz); 100kΩ yields ~1MHz, 10kΩ yields ~100kHz. |
| SHDN/UVLO (Pin 12) | Enable & undervoltage lockout | Falling threshold 1.159V (J-grade); 2.1µA internal pull-down enables hysteresis programming with external divider. |
| INTVCC (Pin 13) | Internal LDO output | 7.15V regulated supply (6.9–7.3V) for gate/PWMOUT drivers; requires 4.7µF local ceramic bypass; current-limited to 14–23mA. |
| VIN (Pin 14) | Main power input | Accepts 6–100V; must be bypassed with ≥0.22µF ceramic cap near pin; powers INTVCC LDO and internal logic. |
| SENSE (Pin 15) | Low-side switch current sense | Kelvin-connected to source of external NMOS; monitors peak switch current; clamped at 108mV typical to limit MOSFET stress. |
| GATE (Pin 16) | NMOS gate driver output | Switches between INTVCC and GND; drives external power FET; forced low during shutdown/fault/idle. |
| GND (Pin 17) | Power & signal ground | Exposed thermal pad; serves as current sense return (SENSE–GND resistor); must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables flexible topology selection (boost/buck/buck-boost/SEPIC/flyback) without compromising ground-referenced LED cathode placement. |
| Improved OPENLED status logic (LT3756-2) | Latches open-LED condition during PWM idle and reasserts it after overvoltage recovery-critical for reliable fault reporting in pulsed automotive lighting. |
| Programmable 100kHz–1MHz switching | Allows optimization of magnetic size vs. efficiency: 500kHz reduces inductor volume by ~4× vs. 100kHz while maintaining >94% efficiency in 30W headlamp designs. |
| 100mV precision current sense threshold | Minimizes I²R loss in sense resistor; enables use of 0.01Ω–0.1Ω resistors for 1A–10A LED currents with <1% gain error over temperature. |
| AEC-Q100 Grade 0 qualification | Validated for operation from –40°C to +150°C junction temperature with HTOL, TC, ESD, and mechanical stress testing per automotive standards. |
| Integrated open-LED and overvoltage protection | Automatically isolates LED string via PWMOUT-driven disconnect FET if FB exceeds VFB + 60mV-prevents catastrophic LED failure during regulator faults. |
Applications
| Automotive LED Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving multi-string white LEDs in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current controller regulating 3–7A LED strings at 40–80V output; manages PWM dimming synchronized to vehicle CAN bus commands. Use Value: 3000:1 true-color PWM dimming preserves D65 white point across entire intensity range; AEC-Q100 qualification ensures 15-year under-hood reliability. |
Use Scenario: Powering 100W+ high-lumen LED fixtures in warehouse ceilings with 277VAC line-derived DC bus. IC Role / Device Role / Timing Role: Boost-mode LED driver converting 30–60V DC bus to 80–100V for series-connected COB LEDs; uses RT-programmed 375kHz for compact magnetics. Use Value: 100V output capability eliminates need for stacked converters; high-side sensing allows direct cathode grounding for EMC compliance and thermal management. |
| UV-C LED Disinfection Systems | Stage & Architectural LED Wash Lights |
|
Use Scenario: Driving pulsed 275nm UV-C LEDs requiring precise current control and rapid on/off cycling for surface sterilization. IC Role / Device Role / Timing Role: Constant-current source with fast transient response; CTRL pin used for analog current scaling during duty-cycle modulation. Use Value: 100mV sense threshold enables accurate sub-amp current control; OPENLED status confirms LED continuity before each pulse burst-critical for safety interlocks. |
Use Scenario: RGBW LED wash fixtures requiring independent current regulation per channel with synchronized PWM dimming. IC Role / Device Role / Timing Role: Four-channel implementation using one LT3756JMSE-2#TRPBF per channel; shared SYNC not used; individual RT pins set identical frequencies. Use Value: Matched 100mV sense thresholds ensure channel-to-channel current matching <±2%; J-grade temp range maintains color consistency across fixture thermal gradients. |
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#TRPBF | I-grade (–40°C to +125°C), same pinout/functionality, lower max junction temperature. | Suitable for non-under-hood automotive modules or industrial lighting where ambient < 105°C. | Select when AEC-Q100 Grade 0 is not required and cost sensitivity outweighs extended temperature margin. |
| LT3756HMSE-2#TRPBF | H-grade (–40°C to +150°C), identical electrical specs and thermal performance to J-grade. | Same automotive under-hood use cases; differs only in test screening and qualification documentation. | Choose when full AEC-Q100 documentation traceability is mandated but J-grade availability is constrained. |
Compared with LT3756IMSE-2#TRPBF, the LT3756JMSE-2#TRPBF provides guaranteed operation up to +150°C junction temperature with full AEC-Q100 Grade 0 validation, while LT3756HMSE-2#TRPBF offers identical thermal capability with alternative automotive qualification reporting-making the J-grade optimal for new high-temp designs requiring documented compliance.
Availability
LT3756JMSE-2#TRPBF is available at Aetrix Electronics and suitable for automotive LED headlamps, industrial high-bay lighting, and UV-C disinfection systems requiring stable component supply with long-term lifecycle support.
Supply support for LT3756JMSE-2#TRPBF 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 industrial, automotive, communications, and healthcare markets.
The LT3756 family is designed specifically for high-reliability, high-voltage LED driver applications-emphasizing precision current regulation, robust fault protection, and automotive-grade thermal and reliability performance.
FAQ
What is the maximum operating junction temperature for LT3756JMSE-2#TRPBF?
The LT3756JMSE-2#TRPBF is rated for a maximum junction temperature of +150°C, validated per AEC-Q100 Grade 0. This specification is guaranteed across the full –40°C to +150°C operating range, with thermal derating applied above 125°C to maintain long-term reliability. The exposed pad (Pin 17) must be soldered to a thermal pad on the PCB to achieve the specified θJC = 4°C/W.
How does the OPENLED function differ on LT3756JMSE-2#TRPBF versus earlier variants?
The LT3756JMSE-2#TRPBF implements improved OPENLED status logic: during PWM idle periods, the open-LED condition is latched and remains asserted; after an overvoltage event (FB > VFB + 60mV), OPENLED is de-asserted but reasserted automatically once FB falls below the overvoltage threshold while remaining above the open-LED threshold. This behavior is unique to the -2 variant and enhances fault reporting fidelity in pulsed automotive lighting.
Can LT3756JMSE-2#TRPBF operate in buck mode with high-side current sensing?
Yes, LT3756JMSE-2#TRPBF supports buck-mode operation with high-side current sensing-enabling the LED cathode to remain grounded for simplified thermal management and EMC filtering. In buck configuration, ISP connects to the LED anode, ISN connects to the current sense resistor's low side, and the controller regulates current through the upper switch. The 2.9V–100V ISP/ISN common-mode range accommodates this topology directly.
What is the purpose of the CTRL pin on LT3756JMSE-2#TRPBF?
The CTRL pin on LT3756JMSE-2#TRPBF programs the ISP–ISN current sense threshold: for 0V < VCTRL < 1V, the threshold scales linearly as (VCTRL – 0.1V)/10; above 1.2V, it clamps at 100mV nominal. This enables analog dimming, temperature compensation (e.g., reducing LED current as heatsink temperature rises), or dynamic current adjustment without interrupting PWM dimming.
Is LT3756JMSE-2#TRPBF pin-compatible with LT3756EMSE-2#TRPBF?
Yes, LT3756JMSE-2#TRPBF is pin-compatible with all other LT3756-2 variants in the MSOP package, including LT3756EMSE-2#TRPBF and LT3756IMSE-2#TRPBF. All share identical pinout, electrical interface, and functional behavior-the only differences are temperature grade (J-grade = –40°C to +150°C), AEC-Q100 qualification level, and minor parameter tolerances (e.g., VREF min/max).
LT3756JMSE-2#TRPBF 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:
- 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:
- 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#TRPBF FAQ
1.How can I place an order for LT3756JMSE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756JMSE-2#TRPBF 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#TRPBF reliable?
The price and inventory of LT3756JMSE-2#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3756JMSE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756JMSE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756JMSE-2#TRPBF?
LT3756JMSE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756JMSE-2#TRPBF 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#TRPBF?
For technical support, including LT3756JMSE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756JMSE-2#TRPBF requirements.
6.How does Aetrix verify that LT3756JMSE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3756JMSE-2#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3756JMSE-2#TRPBF?
All LT3756JMSE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756JMSE-2#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT3756JMSE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3756JMSE-2#TRPBF Tags
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