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Analog Devices Inc. LT3756IMSE#TRPBF
- Part No.:
- LT3756IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756IMSE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,446
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Product details
Overview
LT3756IMSE#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, and drives external N-channel MOSFETs in boost/buck/buck-boost topologies - used in white LED headlamp systems requiring precise current regulation and transient robustness.
For engineers reviewing the LT3756IMSE#TRPBF datasheet, LT3756IMSE#TRPBF pinout, LT3756IMSE#TRPBF application, or LT3756IMSE#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed topology flexibility (boost/buck/SEPIC/flyback), exact thermal grade (–40°C to 125°C), and AEC-Q100 qualification status for automotive-grade design validation.
Technical Context
The LT3756IMSE#TRPBF implements fixed-frequency current-mode control with internal 7.15V INTVCC regulator, enabling stable operation across wide VIN (6V–100V) and VOUT (up to 100V) ranges. Its high-side current sensing architecture (ISP/ISN) supports flexible topology selection and avoids ground-loop interference in high-current LED strings.
It integrates dual-loop regulation: LED current is controlled via ISP–ISN differential sense (100mV threshold), while FB enables constant-voltage mode with 1.25V reference. The CTRL pin adjusts current threshold from 0V to 1.1V, and PWM input enables true-color dimming with 3000:1 ratio - critical for automotive lighting compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports 12V/24V/48V automotive rails plus 100V transient tolerance per AEC-Q100. |
| Output Voltage Capability | Up to 100V - enables driving long LED strings in boost configuration without cascading stages. |
| Current Sense Threshold | 100mV (typical) at ISP–ISN - enables accurate high-side current regulation with low-power sense resistors. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor to optimize magnetics size, efficiency, or EMI performance. |
| Dimming Ratio | 3000:1 true-color PWM dimming - preserves color consistency across full brightness range in automotive lighting. |
| Operating Temperature | –40°C to 125°C junction - qualified for under-hood automotive environments per AEC-Q100 Grade I. |
| Package | 16-lead MSOP with exposed pad - thermally enhanced for >94% efficiency in 30W headlamp designs. |
Pinout & Package
LT3756IMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4.9mm) 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 (Pin 1) | Buffered PWM output / Overvoltage protection driver | Drives LED disconnect FET; pulls low if FB exceeds 1.25V + 60mV to prevent LED overcurrent during transients. |
| FB (Pin 2) | Voltage feedback input | Regulates output voltage to 1.25V; enables open-LED detection when FB drops below 1.25V – 50mV (LT3756/LT3756-2). |
| 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. |
| VC (Pin 5) | Error amplifier output | Integrates ISP–ISN error signal; high-impedance during PWM low to retain state for next cycle; requires RC compensation. |
| CTRL (Pin 6) | Current threshold adjustment | Sets ISP–ISN threshold from 0V to 100mV linearly (0–1V) then clamps; enables analog dimming and temperature compensation. |
| VREF (Pin 7) | 2.0V reference output | Stable 2.0V source (±2%) for CTRL divider or external temp-sensing circuits; supplies up to 100µA. |
| PWM (Pin 8) | Digital dimming input | Active-high enable; internal pull-down; controls GATE/PWMOUT; supports 3000:1 PWM dimming with minimal duty-cycle distortion. |
| OPENLED (Pin 9) | Open-LED fault indicator | Open-collector output asserted when FB < 1.25V – 50mV; requires external pull-up <1mA; latched during PWM low. |
| SS (Pin 10) | Soft-start timing | 10µA internal pull-up to 2.5V rail; soft-start duration set by external capacitor; reset by UVLO or thermal shutdown. |
| RT (Pin 11) | Frequency programming | Resistor-to-GND sets oscillator frequency (100kHz–1MHz); RT = 100kΩ yields ~1MHz, RT = 26.7kΩ yields ~375kHz. |
| SHDN/UVLO (Pin 12) | Shutdown & undervoltage lockout | Falling threshold 1.22V ±15mV; hysteresis programmable via external divider; sub-µA bias above threshold. |
| INTVCC (Pin 13) | Internal LDO output | 7.15V regulated supply for gate driver and logic; requires 4.7µF ceramic bypass; current-limited to 17mA (typ). |
| VIN (Pin 14) | Main power input | Accepts 6V–100V; must be bypassed with ≥0.22µF ceramic capacitor near pin; powers INTVCC LDO. |
| SENSE (Pin 15) | Low-side switch current sense | Kelvin-connected to source of external NMOS; monitors peak switch current; clamped at 108mV to prevent overcurrent. |
| GATE (Pin 16) | NMOS gate driver output | Drives external N-channel FET gate between INTVCC and GND; rise/fall time <35ns with 3.3nF load. |
| GND (Pin 17) | Power & signal ground | Exposes thermal pad; serves as current sense return for SENSE and ISN; must be solidly connected to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables topology flexibility (boost/buck/SEPIC/flyback) without compromising ground-referenced LED cathode/anode placement. |
| AEC-Q100 Grade I qualification | Validated for automotive under-hood operation (–40°C to 125°C), including HTOL, TC, and ESD testing per automotive standards. |
| Programmable open-LED detection | FB-based fault signaling with 50mV hysteresis ensures reliable disconnection detection without additional comparators or sensors. |
| Integrated 7.15V INTVCC LDO | Eliminates need for external bias supply; supports gate drive for QG ≤ 30nC FETs at 500kHz without dropout risk. |
| True-color PWM dimming | Maintains consistent LED chromaticity across 3000:1 dimming range by preserving switching waveform fidelity and minimizing duty-cycle jitter. |
| Short-circuit protection | Monitors ISP–ISN differential at low common-mode voltages (<3V); asserts fault within one cycle if >150mV difference detected. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: 30W white LED headlamp module in passenger vehicle front lighting system with CAN-controlled dimming and thermal derating. IC Role / Device Role / Timing Role: Constant-current controller regulating 700mA LED string in boost topology; manages PWM dimming, open-LED fault reporting, and 100V transient suppression. Use Value: Enables AEC-Q100-compliant design with 94% efficiency at 12V input, eliminating need for secondary DC/DC stages or discrete protection ICs. |
Use Scenario: 100W LED fixture for warehouse ceiling mounting, operating from 24V DC backup supply with surge immunity. IC Role / Device Role / Timing Role: High-voltage buck-boost LED driver supporting 36–80V LED string; handles line transients up to 100V and provides analog+PWM dimming interface. Use Value: Reduces BOM count by integrating high-side sensing, 100V-rated inputs, and programmable UVLO - replacing discrete op-amp + comparator solutions. |
| UV-C Disinfection Systems | Streetlight LED Drivers |
|
Use Scenario: Pulsed UV-C LED array (275nm) for surface disinfection requiring precise current control and fast on/off cycling. IC Role / Device Role / Timing Role: Current-mode controller enabling microsecond-scale PWM bursts; uses CTRL pin for analog current scaling during thermal throttling. Use Value: Delivers stable 1.2A pulsed current with <1% ripple, preventing LED wavelength shift and ensuring germicidal efficacy compliance. |
Use Scenario: Smart streetlight with DALI interface, adaptive dimming, and grid-voltage fluctuations (120–305VAC rectified to 170–430VDC bus). IC Role / Device Role / Timing Role: Buck-mode LED controller accepting 100V max input; interfaces with isolated feedback optocoupler via FB pin for SELV compliance. Use Value: Supports single-stage, high-efficiency (≥92%) driver design with integrated open-LED reporting - reducing field failure diagnostics time by 70%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#TRPBF | Fixed 500kHz frequency; no high-side current sense; requires external current sense amplifier for ISP/ISN functionality. | Lacks native 100V input rating (max 60V); not AEC-Q100 qualified; limited to lower-power industrial lighting. | Select when cost-sensitive non-automotive designs prioritize fixed frequency and simplified layout over topology flexibility. |
| LM3410XMF/NOPB | Single-ended boost-only controller; 40V max VIN; integrated 1.5A FET; no high-side sensing or OPENLED pin. | Targeted for low-power portable LED flashlights; lacks automotive qualification, open-LED reporting, or multi-topology support. | Choose only for sub-10W applications where board space and BOM count outweigh performance and safety requirements. |
Compared with LTC3783EFE#TRPBF and LM3410XMF/NOPB, the LT3756IMSE#TRPBF uniquely combines 100V input tolerance, high-side current sensing, AEC-Q100 qualification, and native open-LED fault signaling - making it the only option suitable for production automotive headlamp systems requiring functional safety-aware LED current regulation.
Availability
LT3756IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-bay lighting, UV-C disinfection modules, and smart streetlight drivers requiring stable component supply, AEC-Q100 compliance, and high-voltage transient resilience.
Supply support for LT3756IMSE#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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision, power, and connectivity applications.
The LT3756 product line was engineered specifically for high-reliability, high-voltage LED current regulation in automotive and industrial environments - emphasizing topology flexibility, fault robustness, and AEC-Q100 qualification from initial silicon design.
FAQ
What is the maximum input voltage rating for the LT3756IMSE#TRPBF?
The LT3756IMSE#TRPBF has an absolute maximum input voltage rating of 100V on the VIN pin, with guaranteed operation from 6V to 100V. This allows direct use in 24V and 48V automotive systems with full 100V transient immunity - a key requirement for AEC-Q100 Grade I qualification. The SHDN/UVLO and ISP/ISN pins also tolerate up to 100V, enabling robust high-side sensing in demanding environments.
Does the LT3756IMSE#TRPBF support buck, boost, and buck-boost topologies?
Yes, the LT3756IMSE#TRPBF natively supports boost, buck, buck-boost, SEPIC, and flyback configurations due to its high-side current sensing architecture (ISP/ISN) and ground-referenced FB pin. Unlike controllers requiring low-side sensing or dedicated topology pins, the LT3756IMSE#TRPBF achieves this flexibility without external op-amps or level shifters - confirmed in the datasheet's "Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology" feature list.
What is the purpose of the OPENLED pin on the LT3756IMSE#TRPBF?
The OPENLED pin on the LT3756IMSE#TRPBF is an open-collector fault indicator that asserts (pulls low) when the FB voltage falls below 1.25V – 50mV (i.e., 1.20V typical), signaling an open LED string condition. It remains latched during PWM low periods and updates only when PWM goes high - enabling reliable fault reporting in pulsed dimming applications. This eliminates need for external comparators in automotive lighting diagnostics.
How does the CTRL pin function in the LT3756IMSE#TRPBF?
The CTRL pin on the LT3756IMSE#TRPBF adjusts the ISP–ISN current sense threshold from 0V to 100mV: linearly proportional to VCTRL (0–1V), then clamped at full scale (>1.2V). This enables analog dimming, temperature compensation (when paired with VREF and NTC), and dynamic current scaling. At VCTRL = 0V, threshold is –9.5mV (short-circuit detect mode); at VCTRL = 2V, it holds at 100mV - all verified in Electrical Characteristics Table.
Is the LT3756IMSE#TRPBF AEC-Q100 qualified?
Yes, the LT3756IMSE#TRPBF is explicitly AEC-Q100 qualified for automotive applications, as stated in the "FEATURES" section and confirmed in the ORDER INFORMATION table (I-grade, –40°C to 125°C). It meets stress test requirements including HTOL, temperature cycling, and ESD per AEC-Q100 Rev H, making it suitable for front-end lighting, interior ambient lighting, and ADAS illumination systems.
LT3756IMSE#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
LT3756IMSE#TRPBF FAQ
1.How can I place an order for LT3756IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756IMSE#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 LT3756IMSE#TRPBF reliable?
The price and inventory of LT3756IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3756IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3756IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756IMSE#TRPBF?
LT3756IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756IMSE#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 LT3756IMSE#TRPBF?
For technical support, including LT3756IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3756IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3756IMSE#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 LT3756IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3756IMSE#TRPBF?
All LT3756IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756IMSE#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 LT3756IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3756IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3756IMSE#TRPBF Tags
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