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Analog Devices Inc. LT3756HMSE-2#TRPBF
- Part No.:
- LT3756HMSE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756HMSE-2#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,648
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Product details
Overview
LT3756HMSE-2#TRPBF 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, and features high-side current sensing for boost/buck/buck-boost topologies. It drives external N-channel MOSFETs with a regulated 7.15V gate drive supply and includes open-LED protection - used in headlamp drivers and industrial lighting systems.
For engineers reviewing the LT3756HMSE-2#TRPBF datasheet, LT3756HMSE-2#TRPBF pinout, LT3756HMSE-2#TRPBF application, or LT3756HMSE-2#TRPBF equivalent, key selection considerations include its AEC-Q100 qualification, –40°C to +150°C junction temperature rating, 100mV high-side current sense threshold, programmable 100kHz–1MHz switching frequency, and integrated open-LED status reporting via OPENLED pin.
Technical Context
The LT3756HMSE-2#TRPBF implements fixed-frequency current-mode control with an internal transconductance error amplifier (VC) and dual-loop regulation - supporting both constant-current (via ISP/ISN differential sensing) and constant-voltage (via FB) operation. Its high-side current sense architecture enables flexible topology selection including boost, buck, buck-boost, SEPIC, and flyback.
It integrates a 7.15V LDO for gate driving, programmable soft-start (SS), adjustable UVLO with hysteresis (SHDN/UVLO), and dedicated protection features: open-LED detection (FB < VFB – 50mV), overvoltage shutdown (FB > VFB + 60mV), short-circuit detection (ISP–ISN > 150mV at low common-mode), and thermal shutdown at 165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide-range automotive battery inputs including cold-crank and load-dump transients. |
| Output Voltage Capability | Up to 100V - enables driving long LED strings in headlamps and architectural lighting without cascading stages. |
| Current Sense Threshold | 100mV (typical) across ISP–ISN - enables precise, low-loss high-side LED current regulation with minimal power dissipation. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor to optimize efficiency, EMI, or magnetic component size. |
| Operating Junction Temp | –40°C to +150°C - H-grade qualification ensures reliability in under-hood automotive environments. |
| PWM Dimming Ratio | 3000:1 - enables true-color, flicker-free dimming for adaptive front-lighting systems (AFS). |
| Open-LED Detection | FB < VFB – 50mV (typ) - asserts OPENLED pin to signal fault condition while maintaining system-level diagnostics. |
Pinout & Package
LT3756HMSE-2#TRPBF 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. θJA = 43°C/W, θJC = 4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output / Overvoltage fault indicator | Drives external disconnect FET; pulled low when FB exceeds VFB + 60mV to isolate LED string during overvoltage events. |
| FB (Pin 2) | Voltage feedback input | Regulates output voltage to 1.25V nominal; enables CV mode and triggers OPENLED when below VFB – 50mV. |
| ISN (Pin 3) | Negative current sense input | High-side current sense return; bias current ≤25µA; participates in short-circuit detection when VISN < 3V. |
| ISP (Pin 4) | Positive current sense input | High-side current sense input; monitors LED string current; combined with ISN sets ILED = 100mV/RSENSE. |
| VC (Pin 5) | Error amplifier output | Integrates regulation error; connects to RC compensation network; high-impedance during PWM low for state retention. |
| CTRL (Pin 6) | Current threshold adjustment | Programs ISP–ISN threshold from 0V to 100mV linearly (0–1V), then clamps at full scale (>1.2V); enables analog dimming. |
| VREF (Pin 7) | 2.00V reference output | Stable 2V source (±2% over temp); supplies CTRL divider or temperature compensation circuitry; max 100µA load. |
| PWM (Pin 8) | Digital dimming enable | Active-high logic input; disables switching, idles oscillator, and forces GATE/PWMOUT low when low; internal pull-down. |
| OPENLED (Pin 9) | Open-LED status output | Open-collector output asserted when FB < VFB – 50mV; requires external pull-up <1mA; latched during PWM low. |
| SS (Pin 10) | Soft-start timing | 10µA internal current charges external capacitor; controls startup ramp rate and prevents inrush; reset by UVLO or thermal fault. |
| RT (Pin 11) | Frequency programming | Resistor-to-GND sets oscillator frequency (100kHz–1MHz); value determines slope of ramp generator and timing accuracy. |
| SHDN/UVLO (Pin 12) | Shutdown & undervoltage detect | 1.22V falling threshold with programmable hysteresis; sub-µA bias above threshold; enables/disables IC based on VIN health. |
| INTVCC (Pin 13) | Internal LDO output | 7.15V regulated supply (±150mV) for gate driver and logic; requires 4.7µF local ceramic bypass; current-limited to ~17mA. |
| VIN (Pin 14) | Main power input | Accepts 6–100V; powers INTVCC LDO and internal circuits; must be bypassed with ≥0.22µF ceramic near pin. |
| SENSE (Pin 15) | Low-side switch current sense | Kelvin-connected to source of external N-FET; senses peak switch current; limits at 108mV to prevent MOSFET overcurrent. |
| GATE (Pin 16) | N-FET gate driver output | Drives external MOSFET gate between INTVCC and GND; rise/fall time <35ns into 3.3nF; disabled during fault or shutdown. |
| GND (Pin 17) | Power & signal ground | Exposes thermal pad; serves as return for SENSE resistor and internal circuits; must be soldered to large PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified (H-grade) | Rated for –40°C to +150°C junction operation - validated for automotive under-hood deployment including headlamp modules. |
| High-side current sensing | Enables topology flexibility (boost/buck/buck-boost/SEPIC/flyback) without compromising ground-referenced LED cathode placement. |
| Integrated open-LED and overvoltage protection | OPENLED pin asserts on open load; PWMOUT pulls low on overvoltage - provides autonomous fault response without MCU intervention. |
| Programmable 100kHz–1MHz switching | RT resistor allows optimization of magnetics size, efficiency, and EMI profile - critical for space-constrained automotive designs. |
| 3000:1 true-color PWM dimming | Preserves LED chromaticity across full dimming range - essential for adaptive driving beam (ADB) and dynamic lighting systems. |
| Low shutdown current (<1µA) | Minimizes battery drain in always-on vehicle systems (e.g., daytime running lights) during ignition-off states. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 30W white LED arrays in vehicle headlamps with adaptive beam shaping and dynamic leveling. IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current with 3000:1 PWM dimming and open-LED fault signaling. Use Value: AEC-Q100 H-grade operation ensures reliability at 150°C junction; high-side sensing simplifies layout with grounded LED cathodes. |
Use Scenario: Powering multi-string 100W+ LED fixtures in warehouses and factories requiring stable light output over wide input voltage ranges. IC Role / Device Role / Timing Role: Primary DC/DC controller enabling boost topology to maintain regulation despite 277VAC-derived 300–400VDC bus sag. Use Value: 100V output capability eliminates need for series-connected controllers; programmable frequency reduces EMI filter size. |
| Streetlight LED Driver | Battery-Powered Emergency Lighting |
|
Use Scenario: Outdoor LED streetlights powered from 120/240VAC rectified bus with surge protection and wide ambient temperature variation. IC Role / Device Role / Timing Role: Constant-current regulator with open-LED detection and thermal foldback for unattended long-life operation. Use Value: 100VOUT capability supports long LED strings; –40°C to +150°C rating ensures performance in desert and arctic climates. |
Use Scenario: Portable or backup lighting systems using 12V/24V lead-acid or Li-ion batteries with limited capacity and voltage droop. IC Role / Device Role / Timing Role: Efficient buck-mode LED driver delivering stable current despite battery discharge from 12.8V down to 9V. Use Value: 6V minimum VIN enables deep discharge utilization; <1µA shutdown current extends standby runtime significantly. |
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 | Same functionality and pinout, but rated for –40°C to +125°C junction temperature (I-grade). | Suitable for non-automotive industrial or commercial lighting where ambient temperatures remain below 125°C. | Select when AEC-Q100 qualification and 150°C operation are not required - lower cost and broader distributor availability. |
| LT3756EUD-2#TRPBF | Identical electrical specs, but in 3mm × 3mm QFN package with θJA = 68°C/W (vs. 43°C/W for MSOP). | Better suited for space-constrained PCBs where thermal management uses copper area rather than airflow. | Choose for compact designs needing smaller footprint; verify thermal design meets 150°C junction limit under worst-case load. |
Compared with LT3756IMSE-2#TRPBF, the LT3756HMSE-2#TRPBF adds automotive-grade thermal margin and qualification; compared with LT3756EUD-2#TRPBF, it offers superior thermal resistance in MSOP form factor - making it optimal for high-power, high-ambient automotive LED drivers where reliability trumps board area.
Availability
LT3756HMSE-2#TRPBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-bay lighting, outdoor streetlight drivers, and battery-backed emergency lighting requiring stable component supply and extended temperature operation.
Supply support for LT3756HMSE-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 precision instrumentation, industrial automation, communications, and automotive markets.
The LT3756 family is engineered specifically for high-reliability, high-voltage LED driver applications - emphasizing robust protection, wide input/output range, and AEC-Q100 compliance for automotive lighting systems.
FAQ
What is the maximum operating junction temperature for LT3756HMSE-2#TRPBF?
The LT3756HMSE-2#TRPBF is rated for a maximum junction temperature of +150°C and is qualified per AEC-Q100 Grade 0. This specification enables reliable operation in under-hood automotive environments where ambient temperatures exceed 105°C. Thermal design must ensure θJA × PD + TA ≤ 150°C, with the exposed pad properly soldered to a thermal plane.
Does LT3756HMSE-2#TRPBF support both constant-current and constant-voltage regulation?
Yes, the LT3756HMSE-2#TRPBF supports dual-loop regulation: constant-current via ISP/ISN differential sensing (targeting 100mV) and constant-voltage via the FB pin (regulated to 1.25V). The two loops interact - the current loop dominates during normal LED operation, while the voltage loop activates during open-LED conditions or CV-mode applications like battery charging.
How does the OPENLED pin function on LT3756HMSE-2#TRPBF?
The OPENLED pin on LT3756HMSE-2#TRPBF is an open-collector output that pulls low when FB falls below VFB – 50mV (typically 1.20V), indicating an open LED string. It remains latched during PWM low periods and updates only when PWM goes high. An external pull-up resistor (<1mA) is required; this pin is unique to LT3756 and LT3756-2 variants - absent on LT3756-1.
Can LT3756HMSE-2#TRPBF drive a buck configuration?
Yes, the LT3756HMSE-2#TRPBF supports buck topology through high-side current sensing - unlike traditional low-side controllers. In buck mode, the LED string connects between input and switch node, with ISP/ISN sensing current upstream of the inductor. This configuration maintains ground-referenced LED cathodes and avoids floating return paths, simplifying EMI and safety compliance.
What is the purpose of the CTRL pin on LT3756HMSE-2#TRPBF?
The CTRL pin on LT3756HMSE-2#TRPBF adjusts the ISP–ISN current sense threshold from 0mV to 100mV: linearly proportional to VCTRL (0–1V), then clamped above 1.2V. This enables analog dimming, temperature compensation (e.g., reducing current as LED junction temperature rises), or programmable current limiting - all without modifying the sense resistor.
LT3756HMSE-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3756HMSE-2#TRPBF FAQ
1.How can I place an order for LT3756HMSE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756HMSE-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 LT3756HMSE-2#TRPBF reliable?
The price and inventory of LT3756HMSE-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 LT3756HMSE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3756HMSE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756HMSE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756HMSE-2#TRPBF?
LT3756HMSE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756HMSE-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 LT3756HMSE-2#TRPBF?
For technical support, including LT3756HMSE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756HMSE-2#TRPBF requirements.
6.How does Aetrix verify that LT3756HMSE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3756HMSE-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 LT3756HMSE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3756HMSE-2#TRPBF?
All LT3756HMSE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756HMSE-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 LT3756HMSE-2#TRPBF part is unused and in its original packaging.
Return procedure for LT3756HMSE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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