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Analog Devices Inc. LT3756EMSE-1#TRPBF
- Part No.:
- LT3756EMSE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756EMSE-1#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,430
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Product details
Overview
LT3756EMSE-1#TRPBF from Analog Devices is a constant-current, constant-voltage LED controller IC designed for high-power automotive and industrial LED drivers. It operates from 6V to 100V input, delivers up to 100V output, supports 3000:1 PWM dimming, drives external N-channel MOSFETs via a 7.15V gate driver, and enables boost/buck/buck-boost/SEPIC/flyback topologies - exemplified in 30W white LED headlamp drivers.
For engineers reviewing the LT3756EMSE-1#TRPBF datasheet, LT3756EMSE-1#TRPBF pinout, LT3756EMSE-1#TRPBF application, or LT3756EMSE-1#TRPBF equivalent, key selection criteria include high-side current sensing (100mV threshold), frequency synchronization capability (LT3756-1 variant), AEC-Q100 qualification, open LED protection, and thermally enhanced MSOP-16 packaging with exposed GND pad.
Technical Context
The LT3756EMSE-1#TRPBF implements fixed-frequency current-mode control with internal slope compensation, enabling stable regulation across wide VIN (6–100V) and VOUT (up to 100V) ranges. Its dual-loop architecture simultaneously manages LED current via ISP/ISN differential sensing and output voltage via FB feedback, with independent thresholds (100mV for current, 1.25V for voltage).
As the LT3756-1 variant, it features a dedicated SYNC pin (replacing OPENLED) for external oscillator synchronization - requiring RT-programmed internal frequency 20% lower than sync signal - and retains all core protections: programmable UVLO with hysteresis, overvoltage fault response (PWMOUT low at FB > VFB + 60mV), short-circuit detection (ISP–ISN > 150mV below 3V common mode), and thermal shutdown at 165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports 12V/24V/48V systems and handles 100V transients without clamping. |
| Output Voltage Capability | Up to 100V - enables long LED strings (e.g., 30× white LEDs @ 3.3V) in boost configuration. |
| Current Sense Threshold | 100mV (typical) - sets LED current ILED = 100mV/RSENSE, minimizing power loss in sense resistor. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor; LT3756-1 adds external synchronization capability. |
| Dimming Ratio | 3000:1 true-color PWM dimming - preserves color consistency across full brightness range. |
| Package & Thermal | 16-lead MSOP with exposed GND pad (θJA = 43°C/W) - rated for –40°C to 125°C junction temperature. |
| AEC-Q100 Grade | Qualified for automotive applications - meets stress test requirements for reliability in vehicle environments. |
Pinout & Package
LT3756EMSE-1#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4.9mm) with exposed GND pad (Pin 17), requiring soldering to PCB for thermal and electrical integrity. Pin numbering follows standard MSOP top-view layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output / Fault indicator | Drives LED disconnect FET; pulled low during FB overvoltage (> VFB + 60mV) to isolate load. |
| FB (Pin 2) | Voltage feedback input | Sets constant-voltage regulation point at 1.25V; triggers OPENLED (not used on -1) or disables PWMOUT on overvoltage. |
| ISN (Pin 3) | Negative current sense input | High-side current sense return; bias current <25µA; enables short-circuit detection when ISP–ISN > 150mV below 3V. |
| ISP (Pin 4) | Positive current sense input | High-side current sense input; bias current varies with CTRL voltage; part of differential pair with ISN. |
| VC (Pin 5) | Error amplifier output | Integrates error signal for loop stability; high-impedance during PWM low to retain state; requires RC compensation network. |
| CTRL (Pin 6) | Current threshold adjustment | Programs ISP–ISN threshold: 100mV (VCTRL > 1.2V), linear scaling (0–1V), or transition region (1–1.2V). |
| VREF (Pin 7) | 2.0V reference output | Stable 2.0V source (±2%) for CTRL biasing or analog dimming; supplies up to 100µA. |
| PWM (Pin 8) | Digital dimming input | Active-high enable; internal pull-down; controls oscillator, GATE, and PWMOUT; low state reduces IQ to <1µA. |
| SYNC (Pin 9) | Frequency synchronization input | Replaces OPENLED on LT3756-1; accepts external clock (50% duty); requires RT setting 20% slower than sync frequency. |
| SS (Pin 10) | Soft-start timing input | 10µA pull-up to 2.5V rail; external capacitor sets soft-start interval; reset by UVLO or thermal fault. |
| RT (Pin 11) | Frequency programming | Resistor-to-GND sets switching frequency (100kΩ → ~100kHz; 10kΩ → ~1MHz); no internal pull-up/down. |
| SHDN/UVLO (Pin 12) | Shutdown & undervoltage detect | 1.22V falling threshold with programmable hysteresis; 2.1µA internal pull-down enables precise UVLO hysteresis design. |
| INTVCC (Pin 13) | Internal LDO output | 7.15V regulated supply (±0.15V) for gate driver and 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 pin; powers INTVCC LDO. |
| 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 N-channel FET between INTVCC and GND; fast rise/fall (<35ns into 3.3nF); sinks/source limited. |
| GND (Pin 17) | Power & signal ground | Exposed pad must be soldered to PCB ground plane; serves as current sense return and thermal path. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables flexible topology selection (boost/buck/buck-boost/SEPIC/flyback) without ground-referenced LED string constraints. |
| Frequency synchronization | Allows precise EMI control by locking switching frequency to external clock - unique to LT3756-1 variant. |
| True-color PWM dimming | 3000:1 ratio preserves LED chromaticity across full intensity range, critical for automotive lighting compliance. |
| Open LED & overvoltage protection | FB-based fault detection asserts OPENLED (LT3756/LT3756-2) or forces PWMOUT low (all variants) to prevent LED damage. |
| Programmable soft-start | External capacitor on SS pin prevents inrush current and stabilizes startup in high-power LED systems. |
| AEC-Q100 qualification | Validated for automotive underhood and headlamp use, ensuring reliability across –40°C to 125°C operating range. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 30W+ white LED arrays in vehicle forward lighting with strict thermal and EMI requirements. IC Role / Device Role / Timing Role: Constant-current controller managing boost converter with external MOSFET, providing synchronized PWM dimming and fault reporting. Use Value: AEC-Q100 qualification ensures operation at 125°C junction; 100V rating withstands load-dump transients; SYNC pin enables EMI spread-spectrum alignment. | Use Scenario: Powering multi-string 100–200W LED fixtures in warehouses and factories with 24–48V DC distribution. IC Role / Device Role / Timing Role: High-efficiency buck-boost LED driver supporting wide input range and long LED strings via high-side sensing. Use Value: 6–100V input range accommodates aging batteries or variable bus voltages; 100mV current sense minimizes power loss; thermally robust MSOP package sustains continuous operation. |
| UV-C Sterilization System | Stage & Studio Lighting |
Use Scenario: Driving high-voltage UV-C LED arrays (e.g., 365nm, 70V strings) for medical-grade disinfection equipment. IC Role / Device Role / Timing Role: Constant-current regulator in flyback topology delivering precise current to sensitive UV LEDs with overvoltage lockout. Use Value: 100V output capability enables direct drive of long UV LED strings; FB overvoltage protection prevents catastrophic LED failure during transient events. | Use Scenario: Programmable RGBW LED luminaires requiring flicker-free dimming and color fidelity across intensity levels. IC Role / Device Role / Timing Role: Dual-loop controller managing both current (for color consistency) and voltage (for auxiliary circuitry) with independent regulation paths. Use Value: 3000:1 true-color PWM dimming maintains CIE coordinates; CTRL pin enables analog dimming for smooth transitions; VREF output simplifies bias network design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#TRPBF | Four-switch buck-boost controller; no integrated gate driver; requires external high-side/lower-side drivers; supports 4–36V input only. | Targeted at mid-power DC-DC conversion with bidirectional voltage regulation; lacks dedicated LED protection features (open LED, overvoltage). | Select when system requires true buck-boost with input/output crossover and higher efficiency at moderate power; not drop-in for LED-specific designs. |
| LM3414HSDE/NOPB | Constant-current buck LED driver with integrated 1.5A MOSFET; max 42V output; no high-side sensing; no SYNC or programmable frequency. | Optimized for single-string, lower-power (<25W) LED applications; lacks topology flexibility and automotive qualification. | Choose for cost-sensitive, space-constrained designs where input ≤42V and topology is fixed buck; not suitable for 100V systems or AEC-Q100 needs. |
Compared with LTC3789EMSE#TRPBF and LM3414HSDE/NOPB, the LT3756EMSE-1#TRPBF uniquely combines 100V operation, high-side current sensing, AEC-Q100 qualification, and frequency synchronization - making it the only option qualified for high-power automotive LED headlamps requiring EMI control and transient robustness.
Availability
LT3756EMSE-1#TRPBF is available at Aetrix Electronics and suitable for automotive headlamp drivers, industrial high-bay lighting, UV-C sterilization systems, and stage lighting requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3756EMSE-1#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-power LED driving - emphasizing wide input/output voltage range, topology flexibility, robust fault protection, and automotive-grade qualification.
FAQ
What is the key functional difference between LT3756EMSE-1#TRPBF and the base LT3756EMSE#TRPBF?
The LT3756EMSE-1#TRPBF replaces the OPENLED pin with a SYNC pin for external oscillator synchronization - enabling precise EMI control by locking switching frequency to an external clock. This differs from the base LT3756EMSE#TRPBF, which uses Pin 9 for open LED fault reporting. Both share identical current/voltage regulation, 100V ratings, and AEC-Q100 qualification.
Does LT3756EMSE-1#TRPBF support constant-voltage regulation in addition to constant-current mode?
Yes, LT3756EMSE-1#TRPBF supports dual-loop regulation: constant-current via ISP/ISN differential sensing (100mV threshold) and constant-voltage via FB pin (1.25V reference). The FB loop can regulate output voltage independently or provide overvoltage protection while current regulation remains active - critical for LED string safety and auxiliary circuit powering.
What is the recommended minimum capacitor value for the INTVCC pin on LT3756EMSE-1#TRPBF?
The recommended minimum capacitor for the INTVCC pin on LT3756EMSE-1#TRPBF is 4.7µF - a low-ESR X7R or X5R ceramic capacitor rated for 10V, placed as close as possible to the pin. This ensures stable gate driver operation, handles peak switching currents, and prevents INTVCC droop that could trigger the 4.1V UVLO and disable the GATE driver.
Can LT3756EMSE-1#TRPBF drive LED strings in buck configuration with high-side current sensing?
Yes, LT3756EMSE-1#TRPBF supports buck configuration with high-side current sensing - achieved by placing the current sense resistor between the LED string anode and input supply, with ISP connected to the resistor's high side and ISN to the LED cathode. This preserves ground-referenced LED return while enabling accurate current measurement independent of output voltage polarity.
Is LT3756EMSE-1#TRPBF pin-compatible with other variants like LT3756EMSE-2#TRPBF?
No, LT3756EMSE-1#TRPBF is not pin-compatible with LT3756EMSE-2#TRPBF. While both use the same MSOP-16 package, Pin 9 is SYNC on the -1 variant but OPENLED on the -2 variant. Swapping them requires PCB layout changes to accommodate the different pin functions and associated external circuitry (e.g., sync clock vs. open-drain fault indicator).
LT3756EMSE-1#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-1#TRPBF FAQ
1.How can I place an order for LT3756EMSE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756EMSE-1#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-1#TRPBF reliable?
The price and inventory of LT3756EMSE-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3756EMSE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756EMSE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756EMSE-1#TRPBF?
LT3756EMSE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756EMSE-1#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-1#TRPBF?
For technical support, including LT3756EMSE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756EMSE-1#TRPBF requirements.
6.How does Aetrix verify that LT3756EMSE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3756EMSE-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3756EMSE-1#TRPBF?
All LT3756EMSE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756EMSE-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3756EMSE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3756EMSE-1#TRPBF Tags
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