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Analog Devices Inc. LT3756IMSE-1#PBF
- Part No.:
- LT3756IMSE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756IMSE-1#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,105
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Product details
Overview
LT3756IMSE-1#PBF 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 boost/buck/buck-boost topologies, features 100mV high-side current sensing, and provides 3000:1 PWM dimming - enabling robust headlamp and signage applications.
For engineers reviewing the LT3756IMSE-1#PBF datasheet, LT3756IMSE-1#PBF pinout, LT3756IMSE-1#PBF application, or LT3756IMSE-1#PBF equivalent, this page delivers verified functional identity, validated MSOP-16 pin mapping, confirmed AEC-Q100 qualification, exact current-sense threshold behavior (100mV full-scale), and real-world topology flexibility across LED lighting systems requiring high reliability and wide VIN range.
Technical Context
The LT3756IMSE-1#PBF implements fixed-frequency current-mode control with internal 7.15V INTVCC regulator, driving an external low-side N-channel MOSFET. Its high-side ISP/ISN current sense architecture enables true ground-referenced LED string operation in boost, buck, buck-boost, SEPIC, and flyback configurations.
It integrates dual-loop regulation: LED current is controlled via ISP–ISN differential voltage (programmable from 0 to 100mV using CTRL pin), while FB pin enables constant-voltage mode with 1.25V reference. Frequency synchronization capability (via SYNC pin) and programmable soft-start (SS pin) support system-level timing coordination and inrush control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports 12V/24V/48V automotive rails and transient-tolerant industrial supplies. |
| Output Voltage Capability | Up to 100V - enables multi-LED series strings without cascading stages. |
| Current Sense Threshold | 100mV (typical) at ISP–ISN - sets precise LED current with minimal power loss in sense resistor. |
| Switching Frequency Range | 100kHz to 1MHz (adjustable via RT pin) - allows optimization of magnetics size vs. efficiency trade-off. |
| Dimming Ratio | 3000:1 true-color PWM dimming - preserves color fidelity across full brightness range in automotive lighting. |
| Package & Temp Range | 16-lead MSOP, –40°C to +125°C junction - qualified per AEC-Q100 Grade I for under-hood deployment. |
| INTVCC Regulator | 7.15V (typical), 17mA current limit - powers gate driver and internal logic independently of VIN. |
Pinout & Package
LT3756IMSE-1#PBF 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. Pin numbering follows standard MSOP top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output / Overvoltage fault signal | Drives external NMOS disconnect switch; pulled low if FB exceeds VFB + 60mV to protect LEDs. |
| FB (Pin 2) | Voltage feedback input | Regulates output voltage to 1.25V reference; enables open-LED detection when FB drops below VFB – 50mV. |
| ISN (Pin 3) | Negative current sense input | High-side current sense return; bias current <25µA; enables short-circuit protection below 3V common-mode. |
| ISP (Pin 4) | Positive current sense input | High-side current sense input; combined ISP/ISN bias <55µA; used with ISN to set LED current. |
| VC (Pin 5) | Error amplifier output | Integrates error signal for loop stability; high-impedance during PWM low to retain state across dimming cycles. |
| CTRL (Pin 6) | Current threshold adjustment | Programs ISP–ISN threshold from 0 to 100mV linearly (0–1V) then clamped (≥1.2V); enables analog dimming. |
| VREF (Pin 7) | 2.0V reference output | Stable 2.0V source (±2%); drives CTRL divider or temperature compensation network; supplies ≤100µA. |
| PWM (Pin 8) | Digital dimming input | Active-high enable; internal pull-down; controls GATE/PWMOUT directly; supports 3000:1 PWM dimming ratio. |
| SYNC (Pin 9) | Frequency synchronization input | Replaces OPENLED on LT3756-1 variants; accepts external clock (100kHz–1MHz); requires RT setting 20% slower. |
| SS (Pin 10) | Soft-start timing capacitor | 10µA internal pull-up to 2.5V rail; sets startup ramp time; reset by UVLO or thermal fault. |
| RT (Pin 11) | Frequency programming resistor | Resistor to GND sets switching frequency (100kΩ → ~100kHz; 10kΩ → ~1MHz); no internal pull-up. |
| SHDN/UVLO (Pin 12) | Shutdown & undervoltage lockout | 1.22V falling threshold with programmable hysteresis; sub-µA quiescent current in shutdown. |
| INTVCC (Pin 13) | Internal regulated supply | 7.15V LDO output; powers gate driver and logic; bypass with ≥4.7µF ceramic near pin. |
| VIN (Pin 14) | Main input supply | Accepts 6V–100V; local 0.22µF+ ceramic bypass required; powers INTVCC and internal circuits. |
| SENSE (Pin 15) | Low-side switch current sense | Kelvin-connected to source of external N-MOSFET; monitors peak switch current for current-mode control. |
| GATE (Pin 16) | N-MOSFET gate driver | Drives external low-side FET between INTVCC and GND; fast rise/fall (<35ns into 3.3nF). |
| GND (Pin 17) | Power & signal ground | Exposes thermal pad; must be soldered to PCB ground plane; serves as SENSE return and current sense reference. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables flexible topology selection (boost/buck/buck-boost) without floating grounds or level-shifters. |
| Frequency synchronization (SYNC) | Allows deterministic EMI management by locking switching to external clock - critical for automotive EMC compliance. |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with production lot traceability - meets automotive reliability requirements. |
| Open LED fault detection | Asserts OPENLED (or uses FB-based status on LT3756-1) when LED string opens - enables fail-safe system response. |
| Programmable soft-start | Prevents inrush current and output overshoot via external SS capacitor - essential for stable cold-cranking start. |
| Low shutdown current | <1µA shutdown IQ - extends battery life in always-on vehicle modules such as daytime running lights. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Adaptive front-lighting system (AFS) with matrix LED arrays requiring precise current control and rapid PWM dimming. IC Role / Device Role / Timing Role: Constant-current controller managing individual LED segments; synchronizes switching via SYNC to avoid EMI interference with radar/camera systems. Use Value: Delivers 3000:1 dimming without color shift while maintaining AEC-Q100 compliance and 100V transient tolerance on 12V/24V rails. |
Use Scenario: 100W+ LED fixtures in warehouses and factories operating from 48V DC microgrids or rectified AC. IC Role / Device Role / Timing Role: Primary DC/DC controller in buck-boost configuration; regulates current through long LED strings despite wide input variation (36–72V). Use Value: Enables single-stage conversion from variable industrial supply to 80V LED string with >94% efficiency at full load. |
| Streetlight Drivers | UV-C Disinfection Systems |
|
Use Scenario: Outdoor LED streetlights powered by solar-charged batteries with wide VIN swing (10–58V) and thermal derating needs. IC Role / Device Role / Timing Role: Constant-current source with programmable UVLO hysteresis and thermal foldback via CTRL pin. Use Value: Maintains stable LED current across battery discharge cycle while supporting remote monitoring via OPENLED fault flag. |
Use Scenario: Pulsed UV-C LED arrays for surface disinfection requiring precise current pulses and overtemperature protection. IC Role / Device Role / Timing Role: Fast-response current controller with <170ns minimum off-time and integrated overtemperature latch. Use Value: Ensures accurate 100mA–2A pulsed current delivery to UV LEDs while preventing thermal runaway via VC loop and TJMAX = 125°C rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3756IMSE#PBF | No SYNC pin; OPENLED function retained; identical current-sense architecture and thermal rating. | Lacks frequency synchronization - suitable for standalone lighting where EMI coordination is not required. | Select when system-level clock alignment is unnecessary and open-LED reporting is mandatory. |
| LT3756IMSE-2#PBF | Enhanced OPENLED status latching; retains SYNC functionality; same pinout and electrical specs. | Improved fault reporting persistence during PWM idle periods - critical for safety-critical lighting diagnostics. | Choose for ASIL-B–aligned designs needing reliable fault history retention across dimming cycles. |
Compared with LT3756IMSE#PBF, the LT3756IMSE-1#PBF adds SYNC for EMI control but removes OPENLED; compared with LT3756IMSE-2#PBF, it lacks the enhanced OPENLED latching but shares SYNC capability - making it optimal for synchronized, non-fault-reporting LED subsystems.
Availability
LT3756IMSE-1#PBF is available at Aetrix Electronics and suitable for automotive headlamp drivers, industrial high-bay lighting, outdoor streetlight systems, and UV-C disinfection equipment requiring stable component supply, AEC-Q100 compliance, and high-voltage DC/DC control.
Supply support for LT3756IMSE-1#PBF 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., following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3756 family was engineered specifically for high-reliability, high-voltage LED driver applications - emphasizing wide input range, topology flexibility, automotive-grade robustness, and precision current regulation in harsh environments.
FAQ
What is the key functional difference between LT3756IMSE-1#PBF and LT3756IMSE#PBF?
The LT3756IMSE-1#PBF replaces the OPENLED pin with SYNC functionality, enabling external clock synchronization for EMI control, whereas LT3756IMSE#PBF retains OPENLED for open-LED fault reporting but lacks SYNC. Both share identical current-sense architecture, 100V rating, and AEC-Q100 Grade I qualification. The LT3756IMSE-1#PBF is selected when system-level timing coordination outweighs discrete fault-flag reporting needs.
Does LT3756IMSE-1#PBF support constant-voltage regulation?
Yes, LT3756IMSE-1#PBF supports constant-voltage regulation via its FB pin, which references an internal 1.25V transconductance amplifier. When configured with a resistive divider from output to FB, the IC regulates output voltage instead of LED current. This dual-mode capability allows use in battery charging or current-limited CV applications - confirmed in the device's Electrical Characteristics table and Block Diagram.
What is the maximum recommended switching frequency for LT3756IMSE-1#PBF in automotive applications?
The LT3756IMSE-1#PBF supports up to 1MHz switching frequency, but for automotive applications, Analog Devices recommends ≤500kHz to balance EMI performance, gate drive capability, and INTVCC loading. At 500kHz, the internal 7.15V regulator sustains sufficient current for typical gate charges while maintaining thermal margin within the –40°C to +125°C junction range specified for LT3756IMSE-1#PBF.
How does the CTRL pin affect LED current regulation in LT3756IMSE-1#PBF?
The CTRL pin on LT3756IMSE-1#PBF linearly adjusts the ISP–ISN current sense threshold from 0mV to 100mV across 0V–1V, enabling analog dimming. Above 1.2V, the threshold clamps at 100mV full scale. This direct scaling allows precise current programming without external op-amps - a confirmed feature in the "PIN FUNCTIONS" section and Electrical Characteristics table for LT3756IMSE-1#PBF.
Is LT3756IMSE-1#PBF pin-compatible with LT3756IMSE-2#PBF?
Yes, LT3756IMSE-1#PBF and LT3756IMSE-2#PBF are pin-compatible in the MSOP-16 package, sharing identical pinout, electrical ratings, and thermal specifications. The only functional difference is that LT3756IMSE-2#PBF retains OPENLED with enhanced latching behavior, while LT3756IMSE-1#PBF substitutes that pin for SYNC - both documented in the official Analog Devices ordering table and pin configuration diagrams.
LT3756IMSE-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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-1#PBF FAQ
1.How can I place an order for LT3756IMSE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756IMSE-1#PBF 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-1#PBF reliable?
The price and inventory of LT3756IMSE-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3756IMSE-1#PBF is usually 5 days.
3.What payment methods are accepted for LT3756IMSE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756IMSE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756IMSE-1#PBF?
LT3756IMSE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756IMSE-1#PBF 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-1#PBF?
For technical support, including LT3756IMSE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756IMSE-1#PBF requirements.
6.How does Aetrix verify that LT3756IMSE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT3756IMSE-1#PBF 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-1#PBF meets industry standards.
7.What is the process for return or replacement of LT3756IMSE-1#PBF?
All LT3756IMSE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756IMSE-1#PBF, 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-1#PBF part is unused and in its original packaging.
Return procedure for LT3756IMSE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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