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Analog Devices Inc. LT3756EMSE#TRPBF
- Part No.:
- LT3756EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756EMSE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,108
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Product details
Overview
LT3756EMSE#TRPBF from Analog Devices is a high-voltage constant-current LED controller IC designed for automotive and industrial LED drivers. It operates from 6V to 100V input, delivers up to 100V output, supports 3000:1 PWM dimming, features high-side current sensing, and drives external N-channel MOSFETs in boost/buck/buck-boost topologies - enabling robust white LED headlamp and streetlight designs.
For engineers reviewing the LT3756EMSE#TRPBF datasheet, LT3756EMSE#TRPBF pinout, LT3756EMSE#TRPBF application, or LT3756EMSE#TRPBF equivalent, key selection criteria include its 100mV high-side current sense threshold, 100kHz–1MHz adjustable switching frequency, AEC-Q100 qualification, 16-lead MSOP package with exposed thermal pad, and dual regulation (constant-current + constant-voltage) capability.
Technical Context
The LT3756EMSE#TRPBF implements fixed-frequency current-mode control with internal 7.15V INTVCC regulator, ground-referenced FB pin for voltage loop regulation, and dedicated ISP/ISN inputs for high-side LED current sensing. Its error amplifier (VC) integrates over cycles to stabilize current demand, while PWMOUT provides buffered PWM signal for LED disconnect FETs.
It supports programmable soft-start via SS pin, undervoltage lockout with hysteresis on SHDN/UVLO, open-LED detection via FB threshold monitoring (−50mV offset), and overvoltage protection triggering PWMOUT low when FB exceeds VFB + 60mV. The CTRL pin enables analog dimming by scaling the 100mV current sense threshold linearly below 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide-range DC supplies including 12V/24V/48V systems and transient-tolerant automotive battery rails. |
| Output Voltage Capability | Up to 100V - enables driving long LED strings in high-brightness applications like headlamps and area lighting. |
| Current Sense Threshold | 100mV (typical) at ISP–ISN - enables precise, low-loss high-side current sensing with minimal power dissipation in sense resistor. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor to optimize efficiency, EMI, and magnetic component size. |
| Dimming Ratio | 3000:1 true-color PWM dimming - preserves LED color fidelity across full brightness range without flicker. |
| Package & Thermal | 16-lead MSOP with exposed GND pad - θJA = 43°C/W; supports operation from −40°C to +125°C junction temperature. |
| AEC-Q100 Grade | Qualified for automotive applications (E-grade) - meets stress testing requirements for under-hood and exterior lighting. |
Pinout & Package
LT3756EMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4.9mm) with exposed GND pad (Pin 17) requiring PCB soldering for thermal and electrical integrity. Pin numbering follows standard MSOP top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output / Overvoltage fault indicator | Drives LED disconnect NMOS; pulled low during FB overvoltage (VFB + 60mV) to isolate load and prevent LED damage. |
| FB (Pin 2) | Voltage feedback input | Regulates output voltage to 1.25V reference; enables constant-voltage mode and open-LED detection (asserts OPENLED when FB < VFB − 50mV). |
| ISN (Pin 3) | Negative current sense input | High-side current sense return; bias current < 25µA; enables short-circuit detection when ISN < 3V and ISP–ISN > 150mV. |
| ISP (Pin 4) | Positive current sense input | High-side current sense input; common-mode range up to 100V; bias current varies with CTRL voltage (max 55µA). |
| VC (Pin 5) | Error amplifier output | Integrates current/voltage error; high-impedance during PWM low to retain state; requires RC compensation network to GND. |
| CTRL (Pin 6) | Analog dimming / current threshold control | Scales ISP–ISN threshold from 0–100mV linearly (0–1V), then holds at full scale (>1.2V); enables precise analog dimming and thermal derating. |
| VREF (Pin 7) | 2.0V reference output | Stable 2.0V source (±2%); supplies up to 100µA; used to bias CTRL divider or implement temperature-compensated LED current limits. |
| PWM (Pin 8) | Digital dimming enable | Active-high logic input; disables switching and idles oscillator when low; internal pull-down; PWMOUT follows PWM with delay. |
| OPENLED (Pin 9) | Open-circuit fault indicator | Open-drain output asserted when FB < VFB − 50mV; requires external pull-up < 1mA; latched during PWM low for reliable fault reporting. |
| 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 shutdown. |
| RT (Pin 11) | Frequency programming | Resistor-to-GND sets oscillator frequency (100kΩ → ~375kHz); no internal pull-up/down; must not be left floating. |
| SHDN/UVLO (Pin 12) | Shutdown & input undervoltage detect | 1.22V falling threshold with programmable hysteresis; sub-µA bias above threshold; 2.1µA pull-down below threshold for hysteresis design. |
| INTVCC (Pin 13) | Internal regulated supply | 7.15V LDO output (±150mV); powers gate driver, PWMOUT, and internal logic; requires 4.7µF ceramic bypass close to pin. |
| VIN (Pin 14) | Main power input | Accepts 6–100V; must be bypassed with ≥0.22µF ceramic capacitor near IC; powers INTVCC LDO and internal circuitry. |
| SENSE (Pin 15) | Low-side switch current sense | Kelvin-connected to source of external N-MOSFET; monitors switch current for slope-compensated current-mode control. |
| GATE (Pin 16) | N-MOSFET gate driver output | Drives external N-channel FET gate between INTVCC and GND; fast rise/fall times (~35ns into 3.3nF); clamped during fault/shutdown. |
| GND (Pin 17) | Power & signal ground / thermal pad | Reference for SENSE, ISN, and internal circuits; exposed pad must be soldered to PCB ground plane for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables flexible topology selection (boost/buck/buck-boost/SEPIC/flyback) without compromising ground-referenced load or controller isolation. |
| 100mV precision current sense threshold | Minimizes I²R losses in sense resistor while maintaining ±2% accuracy over temperature - critical for stable LED current regulation. |
| Integrated 7.15V INTVCC regulator | Eliminates need for external bias supply; supports gate drive for high-Qg MOSFETs; includes UVLO (4.1V) to prevent partial enhancement and shoot-through. |
| True-color 3000:1 PWM dimming | Preserves chromaticity across full dimming range by avoiding low-frequency modulation artifacts - essential for automotive and architectural lighting. |
| Open-LED and overvoltage protection | Dual independent fault responses: OPENLED asserts for open-circuit detection; PWMOUT forces low for FB overvoltage - protects LEDs and system reliability. |
| AEC-Q100 qualified (Grade E) | Validated for automotive under-hood environments (−40°C to +125°C), including HTOL, TC, and ESD testing - suitable for OEM headlamp modules. |
Applications
| Automotive LED Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 30W+ white LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping and diagnostics. IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current while supporting PWM dimming, open-circuit fault reporting, and thermal derating via CTRL pin. Use Value: Enables AEC-Q100-compliant, high-efficiency (94%) headlamp drivers with 3000:1 dimming and built-in safety protections - reducing BOM count and validation effort. |
Use Scenario: Powering multi-string 100V LED fixtures in warehouses and factories where line voltage varies and reliability is mission-critical. IC Role / Device Role / Timing Role: High-input-voltage buck-boost LED controller delivering stable current despite 6–100V input swings and ambient temperatures up to 125°C. Use Value: Eliminates need for pre-regulators or multiple converters; supports single-stage 100V output with integrated UVLO hysteresis and thermal shutdown - simplifying thermal design. |
| Streetlight LED Drivers | Battery-Powered Emergency Lighting |
|
Use Scenario: Outdoor LED streetlights powered from 12–48V DC solar/battery banks or PoE++ infrastructure with surge immunity requirements. IC Role / Device Role / Timing Role: Boost-mode LED controller with 100V transient tolerance, programmable soft-start, and open-LED status for remote monitoring. Use Value: Survives 100V transients per IEC 61000-4-5; enables predictive maintenance via OPENLED reporting; reduces field failure rates in unattended installations. |
Use Scenario: Self-contained emergency exit signs and egress lighting using Li-ion or lead-acid batteries with wide discharge curves (10–30V). IC Role / Device Role / Timing Role: Wide-input constant-current driver supporting analog dimming (CTRL) and digital on/off (PWM) for energy-efficient standby and full-brightness activation. Use Value: Achieves <1µA shutdown current to extend battery life; maintains consistent LED flux across battery voltage drop; eliminates need for separate voltage regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3756IMSE#TRPBF | Same functionality and pinout; rated for −40°C to +125°C industrial temperature range (vs. E-grade's automotive qualification). | Lacks AEC-Q100 certification; suitable for non-automotive industrial LED drivers where extended temp range is needed but automotive qualification is not required. | Select when automotive qualification is unnecessary and cost sensitivity favors industrial-grade variant. |
| LT3756EMSE-2#TRPBF | Includes improved OPENLED status pin behavior (re-asserts after overvoltage clears) and adds SYNC pin for frequency synchronization - replaces OPENLED on LT3756-1. | Supports synchronized multi-channel LED systems and more robust fault recovery; not drop-in compatible due to pin function reassignment (Pin 9 = OPENLED vs. SYNC). | Select when multi-controller synchronization or enhanced open-LED latching behavior is required; requires PCB layout revision. |
Compared with LT3756IMSE#TRPBF, the LT3756EMSE#TRPBF offers automotive qualification but identical electrical specs; compared with LT3756EMSE-2#TRPBF, it provides baseline open-LED reporting without synchronization capability - making it optimal for cost-sensitive, single-channel AEC-Q100-compliant designs.
Availability
LT3756EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive LED headlamps, industrial high-bay lighting, and outdoor streetlight drivers requiring stable component supply, AEC-Q100 compliance, and high-voltage DC/DC control.
Supply support for LT3756EMSE#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 DSP technologies, serving industrial, automotive, communications, and healthcare markets with precision power management solutions.
The LT3756 product line was engineered specifically for high-reliability, high-voltage LED current regulation in demanding environments - emphasizing wide input range, robust fault protection, and automotive-grade qualification.
FAQ
What is the maximum input voltage rating for the LT3756EMSE#TRPBF?
The LT3756EMSE#TRPBF has an absolute maximum input voltage rating of 100V on the VIN pin, and it operates continuously from 6V to 100V. This makes the LT3756EMSE#TRPBF suitable for automotive battery systems with load-dump transients and industrial DC bus applications where input voltage stability cannot be guaranteed.
Does the LT3756EMSE#TRPBF support both constant-current and constant-voltage regulation?
Yes, the LT3756EMSE#TRPBF supports dual regulation modes. It regulates LED current via high-side ISP/ISN sensing for constant-current operation, and uses the FB pin to regulate output voltage to 1.25V for constant-voltage applications such as battery charging or current-limited CV supplies - both modes can coexist with priority logic preventing overvoltage.
What package type and thermal characteristics does the LT3756EMSE#TRPBF use?
The LT3756EMSE#TRPBF is supplied in a 16-lead plastic MSOP package with an 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 the PCB ground plane to achieve rated performance and ensure safe operation up to +125°C junction temperature.
How does the LT3756EMSE#TRPBF implement open-LED fault detection?
The LT3756EMSE#TRPBF detects open-LED conditions by monitoring the FB pin voltage. When FB falls below VFB − 50mV (i.e., 1.20V typical), the OPENLED pin is actively pulled low. This signal remains latched during PWM low periods and updates only when PWM goes high - ensuring reliable fault reporting in pulsed dimming applications using the LT3756EMSE#TRPBF.
Can the LT3756EMSE#TRPBF drive a P-channel MOSFET instead of an N-channel MOSFET?
No, the LT3756EMSE#TRPBF is designed exclusively to drive low-side N-channel MOSFETs via its GATE pin, which swings between INTVCC and GND. It does not provide high-side gate drive or level-shifting capability required for P-channel or high-side N-channel configurations. Topology flexibility is achieved through external circuit design (e.g., boost, buck-boost), not FET type substitution - the LT3756EMSE#TRPBF requires an N-channel switch.
LT3756EMSE#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#TRPBF FAQ
1.How can I place an order for LT3756EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756EMSE#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#TRPBF reliable?
The price and inventory of LT3756EMSE#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3756EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756EMSE#TRPBF?
LT3756EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756EMSE#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#TRPBF?
For technical support, including LT3756EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3756EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3756EMSE#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3756EMSE#TRPBF?
All LT3756EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756EMSE#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#TRPBF part is unused and in its original packaging.
Return procedure for LT3756EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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