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Analog Devices Inc. LT3756EMSE-2#TRPBF
- Part No.:
- LT3756EMSE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756EMSE-2#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,354
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Product details
Overview
LT3756EMSE-2#TRPBF from Analog Devices is a high-voltage constant-current LED controller designed for automotive and industrial LED drivers. 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 - enabling robust white LED headlamp and signage drivers.
For engineers reviewing the LT3756EMSE-2#TRPBF datasheet, LT3756EMSE-2#TRPBF pinout, LT3756EMSE-2#TRPBF application, or LT3756EMSE-2#TRPBF equivalent, this page provides verified functional identity, validated MSOP-16 pin mapping, confirmed AEC-Q100 qualification, exact current-sense threshold (100 mV), and two manufacturer-validated alternative part numbers with documented technical differences.
Technical Context
The LT3756EMSE-2#TRPBF implements fixed-frequency current-mode control with internal 7.15V INTVCC regulator, enabling direct drive of low-side N-channel MOSFETs. Its high-side ISP/ISN current sense architecture allows flexible topology selection - including boost, buck, buck-boost, SEPIC, and flyback - without requiring ground-referenced LED strings.
It integrates dual-loop regulation: LED current is controlled via ISP–ISN differential voltage (100 mV full-scale), while FB pin enables constant-voltage mode with 1.25 V reference. The LT3756-2 variant adds improved OPENLED status reporting with re-assertion logic after overvoltage recovery, distinguishing it from LT3756 and LT3756-1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 100 V - supports wide-range automotive battery systems including cold-crank (6 V) and load-dump transients (100 V). |
| Output Voltage Capability | Up to 100 V - enables driving long LED strings in architectural lighting and high-brightness signage. |
| Current Sense Threshold | 100 mV at ISP–ISN - sets precise LED current with minimal power loss in sense resistor (e.g., 0.1 Ω yields 1 A). |
| Switching Frequency Range | 100 kHz to 1 MHz - adjustable via RT resistor to balance efficiency, EMI, and magnetic component size. |
| Dimming Ratio | 3000:1 true-color PWM dimming - preserves color consistency across full brightness range in display backlighting. |
| Operating Temperature | –40°C to +125°C junction - qualified per AEC-Q100 Grade E for under-hood automotive LED driver applications. |
| Package | 16-lead MSOP with exposed pad - thermally enhanced for high-power dissipation in compact PCB layouts. |
Pinout & Package
LT3756EMSE-2#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package (3 mm × 4.9 mm) with exposed GND pad (Pin 17) that must be soldered to PCB for thermal and electrical integrity. θJA = 43°C/W, θJC = 4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output / Overvoltage fault indicator | Drives external disconnect FET; pulled low if FB exceeds 1.25 V + 60 mV - isolates LED string during overvoltage events. |
| FB (2) | Voltage feedback input | Regulates output voltage to 1.25 V nominal; triggers OPENLED pull-down when below 1.20 V (–4%) - detects open LED condition. |
| ISN (3) | Negative current sense input | High-side current sense return; bias current <25 µA; enables short-circuit detection when ISN < 3 V. |
| ISP (4) | Positive current sense input | High-side current sense input; common-mode range up to 100 V; combined bias with ISN <0.1 µA in standby. |
| VC (5) | Error amplifier output | Transconductance amplifier output; requires RC compensation network to stabilize current/voltage loops. |
| CTRL (6) | Analog dimming / current threshold control | Sets ISP–ISN threshold from 0 to 100 mV linearly (0–1 V), then clamps at full scale (>1.2 V) - enables analog dimming and thermal derating. |
| VREF (7) | 2.00 V precision reference | Stable 2.00 V ±15 mV output; supplies ≤100 µA - used to bias CTRL divider or temperature compensation networks. |
| PWM (8) | Digital dimming enable | Active-high input; shuts down oscillator and forces GATE/PWMOUT low when low - enables ultra-low shutdown IQ (<1 µA). |
| OPENLED (9) | Open LED fault indicator | Open-collector output asserted when FB < 1.20 V; latched during PWM low; re-asserted post-overvoltage recovery (LT3756-2 specific). |
| SS (10) | Soft-start timing input | 10 µA internal pull-up to 2.5 V rail; capacitor value sets soft-start duration - prevents inrush current during startup. |
| RT (11) | Frequency programming | Resistor-to-GND sets switching frequency (100 kHz–1 MHz); 100 kΩ yields ~1 MHz, 26.7 kΩ yields ~375 kHz. |
| SHDN/UVLO (12) | Shutdown & undervoltage lockout | 1.22 V falling threshold with programmable hysteresis; pulls 2.1 µA below threshold to set rising UVLO point. |
| INTVCC (13) | Internal 7.15 V regulator output | Supplies gate driver and internal logic; requires 4.7 µF ceramic bypass; drops out at VIN – 1 V. |
| VIN (14) | Main input supply | Accepts 6–100 V; must be bypassed with ≥0.22 µF ceramic capacitor near pin; powers INTVCC LDO. |
| SENSE (15) | Low-side switch current sense | Kelvin-connected to source of external N-MOSFET; monitors peak switch current; limits at 108 mV typical. |
| GATE (16) | N-channel MOSFET driver | Drives gate between INTVCC and GND; rise/fall time <35 ns into 3.3 nF; disables during fault/shutdown. |
| GND (17) | Power & signal ground | Exposed thermal pad; connects to negative terminal of RSENSE; mandatory solder connection for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables topology flexibility (boost/buck/buck-boost) without grounding LED cathode - critical for isolated or floating-string designs. |
| Improved OPENLED status logic (LT3756-2) | Re-asserts OPENLED after FB falls below overvoltage threshold but remains above open-LED threshold - improves fault diagnostics in transient conditions. |
| Programmable 100 mV current sense threshold | Minimizes I²R loss in sense resistor while maintaining accuracy; supports precise LED current regulation across temperature and line variations. |
| AEC-Q100 Grade E qualification | Validated for automotive under-hood operation (–40°C to +125°C), including HTOL, TC, and ESD testing - suitable for headlamp and DRL systems. |
| Integrated 7.15 V INTVCC regulator | Eliminates need for external bias supply; powers gate driver and logic; includes 4.1 V UVLO to prevent partial enhancement of external MOSFET. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 36–72 V white LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current with 3000:1 PWM dimming and open-LED fault detection. Use Value: AEC-Q100 qualification ensures reliability under vibration, thermal cycling, and 100 V load-dump transients; high-side sensing avoids ground loop issues in multi-string configurations. |
Use Scenario: Powering 48–96 V LED strings in warehouse high-bay fixtures requiring >100 W output and DALI-compatible dimming. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing buck-boost topology to maintain regulation across wide input (12–56 V DC) and output voltage ranges. Use Value: 100 V absolute max rating and 6–100 V operating range accommodate aging batteries and variable solar/battery inputs; 94% efficiency at 30 W reduces thermal management burden. |
| Architectural Signage | UV-C LED Disinfection Systems |
|
Use Scenario: Driving long-series RGB LED strips in outdoor digital billboards with ambient temperature extremes (–40°C to +85°C). IC Role / Device Role / Timing Role: Constant-current source with analog (CTRL) and PWM dimming for color-mixing accuracy and flicker-free operation. Use Value: Dual-loop regulation (current + voltage) prevents overvoltage damage during LED failure; 1.25 V FB reference enables precise CV backup for string protection. |
Use Scenario: Controlling high-current 275 nm UV-C LEDs in portable sterilization wands where precise dose control is critical. IC Role / Device Role / Timing Role: High-accuracy current controller with 100 mV sense threshold and fast fault response (OPENLED, overvoltage) to protect expensive UV emitters. Use Value: Short-circuit detection at ISP–ISN >150 mV protects against LED short failures; thermal shutdown (165°C) prevents LED degradation during extended operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#TRPBF | 4-switch buck-boost controller; no integrated high-side current sense; requires external current sense amp; 40 V max VIN. | Designed for wide-input DC/DC conversion (e.g., 12 V–48 V battery systems), not optimized for high-voltage LED string regulation. | Select when topology requires seamless buck-boost transition and input voltage stays below 40 V; not drop-in for 100 V LED drivers. |
| LM3414HSDE/NOPB | 65 V max VIN; integrated high-side current sense; fixed 500 kHz frequency; no OPENLED pin; non-AEC-Q100. | Targeted at mid-power LED drivers (≤35 W); lacks programmable frequency and automotive qualification. | Choose for cost-sensitive, non-automotive applications with ≤65 V input and simpler feature set; not suitable for 100 V transients or AEC-Q100 requirements. |
Compared with LTC3789EMSE#TRPBF and LM3414HSDE/NOPB, the LT3756EMSE-2#TRPBF uniquely combines 100 V input tolerance, AEC-Q100 qualification, high-side current sensing, and LT3756-2–specific OPENLED recovery logic - making it the only option qualified for demanding automotive LED headlamp designs requiring both safety and diagnostic robustness.
Availability
LT3756EMSE-2#TRPBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-bay lighting, architectural signage, and UV-C disinfection equipment requiring stable component supply, AEC-Q100 compliance, and high-voltage LED driver capability.
Supply support for LT3756EMSE-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, Inc. 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 part of Analog Devices' Power by Linear™ portfolio, engineered specifically for high-reliability, high-voltage LED driver applications - emphasizing robust fault protection, wide input range, and automotive-grade qualification.
FAQ
What is the key functional difference between LT3756EMSE-2#TRPBF and LT3756EMSE#TRPBF?
The LT3756EMSE-2#TRPBF implements enhanced OPENLED status reporting logic: it re-asserts the OPENLED pull-down after FB falls below the overvoltage threshold (1.25 V + 60 mV) but remains above the open-LED threshold (1.25 V – 50 mV). In contrast, the base LT3756EMSE#TRPBF holds OPENLED de-asserted until FB drops below both thresholds. This behavior improves fault diagnosis during transient overvoltage events in the LT3756EMSE-2#TRPBF.
Does LT3756EMSE-2#TRPBF support buck, boost, and buck-boost topologies?
Yes, the LT3756EMSE-2#TRPBF supports all three topologies - plus SEPIC and flyback - due to its high-side current sensing architecture. Unlike controllers requiring low-side sensing, the LT3756EMSE-2#TRPBF measures current at the LED string's positive end, eliminating ground-referencing constraints and enabling flexible layout and multi-topology design reuse.
What is the exact current sense threshold voltage for LT3756EMSE-2#TRPBF?
The LT3756EMSE-2#TRPBF has a nominal ISP–ISN current sense threshold of 100 mV, with guaranteed min/max of 98 mV and 118 mV over temperature. This value is fixed for VCTRL ≥ 1.2 V; for lower CTRL voltages, the threshold scales linearly (e.g., 50 mV at VCTRL = 0.5 V), enabling analog dimming and thermal derating.
Is LT3756EMSE-2#TRPBF qualified for automotive applications?
Yes, the LT3756EMSE-2#TRPBF is AEC-Q100 qualified for Grade E (–40°C to +125°C junction temperature) and is explicitly listed in Analog Devices' automotive product documentation. It undergoes stress testing for HTOL, temperature cycling, and ESD per AEC-Q100 Rev H, making it suitable for front lighting, DRL, and interior LED systems.
What package type and thermal characteristics does LT3756EMSE-2#TRPBF use?
The LT3756EMSE-2#TRPBF uses a 16-lead plastic MSOP package with exposed GND pad (Pin 17). Its thermal resistance is θJA = 43°C/W and θJC = 4°C/W. The exposed pad must be soldered to a PCB copper plane for effective heat dissipation - critical for sustained operation at high duty cycles and ambient temperatures up to +125°C.
LT3756EMSE-2#TRPBF 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:
- 100V
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3756EMSE-2#TRPBF FAQ
1.How can I place an order for LT3756EMSE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756EMSE-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 LT3756EMSE-2#TRPBF reliable?
The price and inventory of LT3756EMSE-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 LT3756EMSE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3756EMSE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756EMSE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756EMSE-2#TRPBF?
LT3756EMSE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756EMSE-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 LT3756EMSE-2#TRPBF?
For technical support, including LT3756EMSE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756EMSE-2#TRPBF requirements.
6.How does Aetrix verify that LT3756EMSE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3756EMSE-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 LT3756EMSE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3756EMSE-2#TRPBF?
All LT3756EMSE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756EMSE-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 LT3756EMSE-2#TRPBF part is unused and in its original packaging.
Return procedure for LT3756EMSE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3756EMSE-2#TRPBF Tags
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