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Analog Devices Inc. LT3756IMSE#PBF
- Part No.:
- LT3756IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756IMSE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,562
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Product details
Overview
LT3756IMSE#PBF 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, regulates LED current via high-side sensing at 100mV threshold, and drives external N-channel MOSFETs using a 7.15V internal gate driver supply - deployed in headlamp and streetlight boost/buck-boost topologies.
For engineers reviewing the LT3756IMSE#PBF datasheet, LT3756IMSE#PBF pinout, LT3756IMSE#PBF application, or LT3756IMSE#PBF equivalent, key selection criteria include its AEC-Q100 qualification, 16-lead MSOP package with exposed thermal pad, programmable 100kHz–1MHz switching frequency, open-LED protection via FB-based fault detection, and dual regulation capability (constant-current + constant-voltage) for flexible LED system design.
Technical Context
The LT3756IMSE#PBF implements fixed-frequency current-mode control with slope compensation, enabling stable operation across wide VIN (6–100V) and VOUT (up to 100V) ranges. Its transconductance error amplifier (VC pin) integrates ISP/ISN differential voltage against CTRL-set threshold or FB-referenced 1.25V, supporting both LED current regulation and CV fallback.
High-side current sensing (ISP/ISN) enables topology flexibility - including boost, buck, buck-boost, SEPIC, and flyback - while the 100mV sense threshold minimizes power loss. The device features dedicated protection logic: open-LED detection (FB < VFB – 50mV), overvoltage shutdown (FB > VFB + 60mV), and short-circuit detection (ISP–ISN > 150mV when ISN < 3V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports 12V/24V/48V systems with 100V transient tolerance for automotive load-dump immunity. |
| Output Voltage Capability | Up to 100V - enables driving long LED strings in series without cascading stages. |
| Current Sense Threshold | 100mV (typical) - low-loss high-side sensing with ±10mV tolerance over temperature ensures precise LED current accuracy. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor to optimize efficiency, EMI, or magnetic component size. |
| Dimming Ratio | 3000:1 true-color PWM dimming - preserves color consistency across full brightness range for premium lighting applications. |
| Operating Temperature | –40°C to +125°C junction - qualified per AEC-Q100 Grade I for under-hood automotive use. |
| Package | 16-lead MSOP with exposed GND pad - thermally enhanced for >1W dissipation in compact layouts. |
Pinout & Package
LT3756IMSE#PBF is housed in a 16-lead plastic MSOP package (3mm × 4.9mm) with exposed thermal pad (Pin 17 = GND), rated for θJA = 43°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output / Overvoltage fault indicator | Drives LED disconnect FET; pulled low when FB exceeds VFB + 60mV to prevent LED overcurrent. |
| FB (Pin 2) | Voltage feedback / Open-LED detection input | Regulates to 1.25V nominal; asserts OPENLED when FB falls below VFB – 50mV (LT3756/LT3756-2 only). |
| ISN (Pin 3) | Negative current sense input | High-side current sense return; bias current ≤25µA; enables short-circuit detection if ISN < 3V. |
| ISP (Pin 4) | Positive current sense input | High-side current sense high side; common-mode range up to 100V; bias current varies with CTRL voltage. |
| VC (Pin 5) | Error amplifier output | Integrates ISP–ISN vs CTRL or FB error; high-impedance during PWM low to retain state for analog dimming hold. |
| CTRL (Pin 6) | Current threshold adjustment | Sets ISP–ISN threshold from 0–100mV linearly (0–1V) then clamps at 100mV (>1.2V); enables analog dimming. |
| VREF (Pin 7) | 2.00V reference output | Stable 2V source (±20mV) for CTRL divider or temperature compensation networks; supplies ≤100µA. |
| PWM (Pin 8) | Digital dimming enable | Active-high; internally pulled down; disables switching and idles VC when low; synchronizes PWMOUT. |
| OPENLED (Pin 9) | Open-LED status output | Open-drain pull-down asserted when FB < VFB – 50mV; requires external <1mA pull-up for fault reporting. |
| SS (Pin 10) | Soft-start timing | 10µA internal current charges external capacitor; resets on UVLO or thermal fault to prevent inrush. |
| RT (Pin 11) | Frequency programming | Resistor-to-GND sets oscillator frequency (100kΩ → ~100kHz; 10kΩ → ~1MHz); no internal pull-up. |
| SHDN/UVLO (Pin 12) | Enable / Input undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.1µA internal pull-down enables precise hysteresis setting. |
| INTVCC (Pin 13) | Internal LDO supply | 7.15V regulated output (±150mV); powers gate driver and logic; requires 4.7µF local ceramic bypass. |
| VIN (Pin 14) | Main input supply | Accepts 6–100V; must be bypassed with ≥0.22µF ceramic near pin; powers INTVCC LDO and UVLO circuitry. |
| SENSE (Pin 15) | Low-side switch current sense | Kelvin-connected to source of external NMOS; monitors peak switch current; limits at 108mV (typ). |
| GATE (Pin 16) | NMOS gate driver output | Swings between GND and INTVCC (7.15V); drives external FET; forced low during shutdown/fault/idle. |
| GND (Pin 17) | Power and signal ground | Exposes thermal pad; serves as SENSE return and ISN reference; must be solidly connected to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables topology-agnostic LED driving (boost/buck/buck-boost/SEPIC/flyback) without ground-referenced string limitations. |
| AEC-Q100 Grade I qualification | Validated for automotive under-hood operation from –40°C to +125°C junction, meeting stress test requirements for reliability. |
| Integrated 7.15V gate driver supply | Eliminates need for external bias rail; supports fast turn-on of standard logic-level N-channel MOSFETs with minimal external components. |
| Dual regulation mode | Simultaneous constant-current (via ISP/ISN) and constant-voltage (via FB) loops allow seamless transition during open-LED faults. |
| Programmable soft-start | External capacitor on SS pin controls ramp rate of VC and oscillator frequency, preventing inrush current and output overshoot. |
| Open-LED and overvoltage protection | Dedicated OPENLED pin and PWMOUT-driven disconnect provide hardware-level fault response without MCU intervention. |
Applications
| Automotive Headlamps | Industrial Street Lighting |
|---|---|
|
Use Scenario: High-brightness white LED arrays in adaptive front-lighting systems (AFS) requiring precise current control and thermal derating. IC Role / Device Role / Timing Role: Constant-current LED controller managing boost converter stage; regulates 3–5A string current with 3000:1 PWM dimming for dynamic beam shaping. Use Value: AEC-Q100 qualification ensures reliability in vibration-prone, high-temperature environments; 100V rating withstands ISO 7637-2 load dump transients. |
Use Scenario: Outdoor LED luminaires powered from 48V DC or rectified AC, operating continuously in harsh ambient conditions. IC Role / Device Role / Timing Role: Primary controller in buck-boost topology driving 40–80V LED strings; uses FB loop for CV fallback during partial string failure. Use Value: High-side sensing allows direct connection to floating LED anodes; 100mV sense threshold reduces heat generation in high-current designs. |
| Commercial Signage | Battery-Powered Emergency Lighting |
|
Use Scenario: RGB LED video walls requiring consistent color point across thousands of pixels with analog + PWM dimming. IC Role / Device Role / Timing Role: Per-channel LED driver in constant-current mode; CTRL pin enables analog dimming for fine-grained brightness tuning alongside PWM. Use Value: Dual dimming interface preserves color fidelity; 16-pin MSOP footprint enables dense PCB layout for multi-channel modules. |
Use Scenario: Self-contained emergency exit signs powered by sealed lead-acid or LiFePO₄ batteries with wide discharge range (10–14V). IC Role / Device Role / Timing Role: Buck-mode LED driver maintaining 350mA string current across battery voltage decay; uses SHDN/UVLO for graceful shutdown at 10.5V. Use Value: 6V minimum start-up enables operation down to deeply discharged batteries; <1µA shutdown IQ extends backup runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3756-1IMSE#PBF | Replaces OPENLED with SYNC pin for oscillator synchronization; identical current/voltage regulation and protection features. | Required where master clock sync is needed across multiple LED drivers to reduce EMI; not suitable if open-LED status reporting is mandatory. | Select LT3756-1IMSE#PBF only when external frequency synchronization is prioritized over fault signaling. |
| LT3756-2IMSE#PBF | Enhanced OPENLED latching behavior: reasserts after FB drops below overvoltage threshold but remains above open-LED threshold. | Preferred in systems requiring robust fault recovery during transient overvoltage events (e.g., lightning-induced surges on outdoor lighting lines). | Choose LT3756-2IMSE#PBF when reliable open-LED reporting under intermittent overvoltage conditions is critical. |
Compared with LT3756IMSE#PBF, the LT3756-1IMSE#PBF trades fault reporting for timing coordination, while the LT3756-2IMSE#PBF improves fault-state persistence - all share identical thermal, electrical, and packaging specs, enabling drop-in replacement in most non-synchronized, non-transient-critical designs.
Availability
LT3756IMSE#PBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial street lighting, commercial signage, and battery-powered emergency lighting requiring stable component supply and AEC-Q100 compliance.
Supply support for LT3756IMSE#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, 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 was engineered specifically for high-reliability, high-voltage LED driver applications - emphasizing topology flexibility, fault resilience, and automotive-grade robustness in compact packages.
FAQ
What is the maximum input voltage rating for the LT3756IMSE#PBF?
The LT3756IMSE#PBF has an absolute maximum input voltage rating of 100V on the VIN pin, and it operates continuously from 6V to 100V. This rating enables compatibility with 48V industrial buses and automotive systems subject to ISO 7637-2 load-dump transients, making the LT3756IMSE#PBF suitable for demanding high-voltage LED driver applications.
Does the LT3756IMSE#PBF support both constant-current and constant-voltage regulation?
Yes, the LT3756IMSE#PBF supports dual regulation modes: constant-current via high-side ISP/ISN sensing and constant-voltage via the FB pin referenced to 1.25V. When an open-LED fault occurs, the FB loop takes over to limit output voltage, preventing damage - a key safety feature implemented in the LT3756IMSE#PBF architecture.
How does the LT3756IMSE#PBF implement open-LED detection?
The LT3756IMSE#PBF detects open-LED conditions by monitoring the FB pin voltage: when FB falls below VFB – 50mV (i.e., <1.20V), the OPENLED pin pulls low to signal the fault. This behavior is active only on LT3756 and LT3756-2 variants - the LT3756-1IMSE#PBF replaces OPENLED with SYNC functionality, so open-LED reporting is unavailable in that variant.
What package type and thermal characteristics apply to the LT3756IMSE#PBF?
The LT3756IMSE#PBF uses a 16-lead MSOP package with an exposed thermal pad (Pin 17 = GND). Its thermal resistance is θJA = 43°C/W and θJC = 4°C/W. The exposed pad must be soldered to a PCB ground plane to achieve rated performance and ensure safe operation at full load in automotive and industrial environments.
Can the LT3756IMSE#PBF drive LEDs in buck configuration?
Yes, the LT3756IMSE#PBF supports buck-mode operation using high-side current sensing - unlike traditional buck controllers that require low-side sensing. This allows the LED cathode to remain grounded while regulating current through the upper switch, simplifying layout and improving noise immunity. The LT3756IMSE#PBF's architecture explicitly lists buck mode among its supported topologies.
LT3756IMSE#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#PBF FAQ
1.How can I place an order for LT3756IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756IMSE#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#PBF reliable?
The price and inventory of LT3756IMSE#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#PBF is usually 5 days.
3.What payment methods are accepted for LT3756IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756IMSE#PBF?
LT3756IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756IMSE#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#PBF?
For technical support, including LT3756IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756IMSE#PBF requirements.
6.How does Aetrix verify that LT3756IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3756IMSE#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#PBF meets industry standards.
7.What is the process for return or replacement of LT3756IMSE#PBF?
All LT3756IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756IMSE#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#PBF part is unused and in its original packaging.
Return procedure for LT3756IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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