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Analog Devices Inc. LT3761EMSE-1#PBF
- Part No.:
- LT3761EMSE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761EMSE-1#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,977
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Product details
Overview
LT3761EMSE-1#PBF from Analog Devices is a 4.5V–60V input, constant-frequency current-mode DC/DC controller optimized for high-current LED driving in boost, SEPIC, inverting, buck-boost, and flyback topologies. It integrates a programmable internal PWM dimming generator (3000:1 True Color PWM™), supports high-side or low-side current sensing up to 80V common-mode, delivers ±3% constant-current and ±2% constant-voltage regulation, and features frequency synchronization capability via SYNC pin - enabling automotive headlamp and industrial lighting systems requiring precise dimming and robust fault protection.
For engineers reviewing the LT3761EMSE-1#PBF datasheet, LT3761EMSE-1#PBF pinout, LT3761EMSE-1#PBF application, or LT3761EMSE-1#PBF equivalent, key selection considerations include its 100kHz–1MHz adjustable switching frequency, rail-to-rail ISP/ISN sensing (0V–80V), 16-lead MSOP package with exposed thermal pad, SYNC pin compatibility for multi-phase timing alignment, and distinction from LT3761 (OPENLED) vs. LT3761-1 (SYNC) variants.
Technical Context
The LT3761EMSE-1#PBF implements a fixed-frequency current-mode control architecture with dual-loop regulation: the ISP/ISN differential input governs constant-current mode (via CTRL-adjustable 242mV full-scale threshold), while FB regulates constant-voltage output (1.25V reference). Its internal oscillator supports external synchronization through the dedicated SYNC pin (1.5V logic-high threshold, 30kΩ pull-down), enabling deterministic phase alignment across multiple converters without jitter accumulation.
Current sensing operates across 0V–80V common-mode range using high-side or low-side configurations, with overcurrent detection triggered at 600mV ISP–ISN differential. The integrated PWM generator uses DIM/SS pin current to set duty ratio (4%–96%) and CPWM to set frequency (215–435Hz), decoupling dimming control from main switching operation for stable color fidelity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V - supports direct connection to 12V/24V/48V industrial and automotive supplies without pre-regulation. |
| ISP/ISN Common-Mode Range | 0V to 80V - enables ground-referred anode LED strings >100V and high-side current sensing in buck-boost/flyback. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor; allows optimization of magnetics size, efficiency, and EMI performance. |
| PWM Dimming Ratio | Up to 3000:1 - True Color PWM™ preserves chromaticity across full dimming range without color shift. |
| Constant-Current Accuracy | ±3% - tight regulation ensures consistent LED brightness and lifetime across temperature and line variations. |
| SYNC Input Compatibility | Logic-level sync (1.5V high, 0.4V low) - enables precise multi-converter timing alignment for reduced ripple and thermal stress. |
| Package | 16-Lead Plastic MSOP with exposed thermal pad - provides 43°C/W θJA for thermally demanding LED driver applications. |
Pinout & Package
LT3761EMSE-1#PBF is housed in a thermally enhanced 16-lead plastic MSOP package (MSE) with exposed pad (Pin 17) soldered to PCB ground for optimal thermal dissipation. Pin 9 functions as SYNC (not OPENLED), distinguishing it from LT3761 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output | Drives external NMOS disconnect switch or level shifter; toggles during FB overvoltage fault to protect LEDs. |
| FB (2) | Voltage feedback input | Sets constant-voltage regulation point at 1.25V; enables open-LED detection when combined with ISP/ISN <25mV. |
| ISN (3) | Negative current sense input | Completes high-side or low-side current sense path; bias current varies with CTRL voltage and ISP/ISN differential. |
| ISP (4) | Positive current sense input | Accepts up to 80V common-mode voltage; overcurrent triggers GATE/PWMOUT shutdown if ISP–ISN >600mV. |
| VC (5) | Error amplifier output | High-impedance node storing demand current state; requires RC compensation network for loop stability. |
| CTRL (6) | Current threshold adjust | Linearly scales ISP–ISN regulation threshold from 21mV (0.2V) to 250mV (≥1.2V); enables analog dimming and thermal derating. |
| VREF (7) | 2.02V reference output | Supplies up to 185µA; used to bias CTRL divider for analog dimming or temperature compensation networks. |
| PWM (8) | Digital dimming input | Accepts external PWM signal or self-oscillates with CPWM; supports 3000:1 dimming when driven externally. |
| SYNC (9) | External clock input | Replaces OPENLED on LT3761-1; synchronizes internal oscillator to external 50% duty-cycle logic signal. |
| DIM/SS (10) | Soft-start & PWM gen control | 12µA internal pull-up sets PWMOUT duty ratio; capacitor to GND defines soft-start time and dimming frequency. |
| RT (11) | Frequency programming | Resistor to GND sets switching frequency from 100kHz to 1MHz; critical for EMI filtering and inductor selection. |
| EN/UVLO (12) | Enable & undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.3µA pull-down enables precise UVLO hysteresis programming. |
| INTVCC (13) | Internal LDO output | 7.85V regulated supply powers gate drivers; requires 1µF ceramic bypass close to pin and exposed pad. |
| VIN (14) | Main power input | Supplies INTVCC LDO and internal circuitry; requires 0.22µF local bypass for transient immunity. |
| SENSE (15) | Switch current sense | Kelvin-connected to source of external NFET; monitors peak switch current with 105mV limit threshold. |
| GATE (16) | NFET gate driver | Drives external power MOSFET between INTVCC and GND; 25ns rise/fall times support high-frequency operation. |
| GND (17) | Power & signal ground | Exposed thermal pad must be soldered to PCB ground plane; serves as Kelvin return for SENSE and ISN paths. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 ratio with no perceptible color shift - achieved via synchronized internal PWM generator and fast gate driver response. |
| Rail-to-rail current sense | 0V–80V common-mode range - supports grounded-anode LED strings and high-voltage industrial lighting without level-shifting circuits. |
| Frequency synchronization | Dedicated SYNC pin accepts external clock - eliminates beat frequencies in multi-channel LED systems and simplifies EMI filter design. |
| Integrated C/10 battery charge indicator | Monitors ISP–ISN differential to assert OPENLED-equivalent status - enables termination signaling in supercapacitor/battery charging applications. |
| Output short-circuit protection | Automatic GATE/PWMOUT shutdown when ISP–ISN >600mV - protects external FET and inductor during load faults without external sensing. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 60W+ white LED arrays in vehicle forward lighting with adaptive beam shaping and dynamic dimming. IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current while synchronizing switching frequency across multiple channels via SYNC pin. Use Value: Enables 94% efficient boost conversion at 60VIN, 3000:1 flicker-free dimming, and fault-safe open-LED detection for ASIL-B compliance. | Use Scenario: Powering 100–200V LED strings in warehouse high-bay fixtures with DALI-compatible analog dimming interface. IC Role / Device Role / Timing Role: High-side current-sense LED controller operating in buck-boost topology with programmable CTRL-based thermal derating. Use Value: Supports 80V common-mode sensing for grounded-anode strings, ±3% current accuracy over –40°C to 125°C, and seamless integration with 0–10V analog dimming inputs. |
| UV-C Disinfection Module | Li-ion Battery Charger |
Use Scenario: Driving high-power 275nm UV-C LEDs requiring precise current regulation and rapid on/off pulsing for germicidal cycles. IC Role / Device Role / Timing Role: Fast-response current-mode controller using PWM pin for microsecond-level LED enable/disable control and VC loop for stable current hold. Use Value: Delivers 180ns minimum on-time and 160ns minimum off-time for sub-millisecond pulsing, with 105mV SENSE current limit preventing LED overstress. | Use Scenario: Charging 3S–6S Li-ion packs with CC/CV profile and C/10 termination detection in portable medical equipment. IC Role / Device Role / Timing Role: Dual-loop regulator using FB for voltage regulation and ISP/ISN for current regulation, with C/10 threshold monitoring via VISP-ISN. Use Value: Integrates C/10 charge termination flag (25mV threshold), ±2% CV accuracy, and open-LED-like fault signaling for safe battery cutoff without external comparators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | Fixed 500kHz frequency, no internal PWM generator, requires external dimming IC; supports 4.5V–60V VIN but lacks SYNC pin. | Best suited for simpler constant-current LED drivers where external PWM control is acceptable and synchronization is not required. | Select LTC3783EFE#PBF when system-level dimming is handled by MCU and board space constraints favor smaller SO-16 package. |
| LT3756EMSE#PBF | Same 4.5V–60V range and 16-MSOP package, but lacks internal PWM generator and SYNC; offers higher 100V ISP/ISN rating and 1.5MHz max frequency. | Ideal for ultra-high-voltage LED strings (>100V) where internal dimming is unnecessary and higher switching frequency reduces magnetics size. | Choose LT3756EMSE#PBF for >100V LED strings requiring minimal external components and maximum switching frequency flexibility. |
Compared with LTC3783EFE#PBF and LT3756EMSE#PBF, LT3761EMSE-1#PBF uniquely combines internal 3000:1 PWM generation, SYNC capability for multi-channel coherence, and integrated C/10 battery charge signaling - making it optimal for automotive lighting and intelligent charging systems where timing precision and feature integration reduce BOM count.
Availability
LT3761EMSE-1#PBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-bay lighting, UV-C disinfection modules, and Li-ion battery chargers requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term production continuity.
Supply support for LT3761EMSE-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3761/LT3761-1 product line was designed specifically for high-efficiency, high-reliability LED current regulation in harsh environments - emphasizing wide input range, robust fault protection, and advanced dimming capabilities for next-generation lighting and power conversion systems.
FAQ
What is the key functional difference between LT3761EMSE-1#PBF and LT3761EMSE#PBF?
The LT3761EMSE-1#PBF features a SYNC pin (Pin 9) for external clock synchronization, replacing the OPENLED pin found on LT3761EMSE#PBF. This enables deterministic phase alignment across multiple converters - critical for reducing EMI in multi-channel LED drivers. LT3761EMSE#PBF uses Pin 9 for open-LED fault reporting, making it suitable for single-channel systems requiring fault diagnostics. Both share identical electrical specs, package, and temperature range.
Can LT3761EMSE-1#PBF drive LED strings with anode grounded to chassis?
Yes, LT3761EMSE-1#PBF supports grounded-anode LED configurations via its rail-to-rail ISP/ISN current sense inputs (0V–80V common-mode range). When used in boost or SEPIC topologies, the ISN pin connects to system ground while ISP senses the cathode-side current sense resistor, enabling direct measurement of LED current without level-shifting circuitry - a key advantage for automotive and industrial chassis-grounded systems.
What is the minimum external capacitor required on the DIM/SS pin for stable PWM generator operation in LT3761EMSE-1#PBF?
The DIM/SS pin requires a minimum 560pF capacitor to GND when used with the internal PWM generator function. This capacitor, combined with the internal 12µA pull-up current, sets the charging time that determines PWMOUT frequency (215–435Hz typical). For reliable soft-start and dimming waveform stability, Analog Devices recommends ≥1nF ceramic capacitor placed close to the pin, as smaller values may cause erratic startup or inconsistent dimming duty ratios in production environments.
How does the SYNC pin on LT3761EMSE-1#PBF affect switching frequency selection?
When using the SYNC pin on LT3761EMSE-1#PBF, the RT resistor must be selected to program an internal oscillator frequency ~20% slower than the external SYNC signal frequency. Gate turn-on occurs after a fixed delay following the SYNC rising edge. This ensures reliable locking without cycle skipping. If SYNC is unused, it must be tied to PWMOUT; leaving it floating risks erratic operation due to noise coupling into the high-impedance input.
Does LT3761EMSE-1#PBF support both constant-current and constant-voltage regulation simultaneously?
Yes, LT3761EMSE-1#PBF implements dual-loop regulation: ISP/ISN differential controls constant-current mode (±3% accuracy), while FB regulates constant-voltage output (±2% accuracy at 1.25V). The loops interact such that FB will not exceed its reference unless ISP/ISN falls below the C/10 threshold (25mV), enabling seamless transition between CC and CV modes - essential for battery charging and LED driver applications with overvoltage protection requirements.
LT3761EMSE-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- True Color PWM™
- 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):
- 4.5V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3761EMSE-1#PBF FAQ
1.How can I place an order for LT3761EMSE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761EMSE-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 LT3761EMSE-1#PBF reliable?
The price and inventory of LT3761EMSE-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 LT3761EMSE-1#PBF is usually 5 days.
3.What payment methods are accepted for LT3761EMSE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761EMSE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761EMSE-1#PBF?
LT3761EMSE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761EMSE-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 LT3761EMSE-1#PBF?
For technical support, including LT3761EMSE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761EMSE-1#PBF requirements.
6.How does Aetrix verify that LT3761EMSE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT3761EMSE-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 LT3761EMSE-1#PBF meets industry standards.
7.What is the process for return or replacement of LT3761EMSE-1#PBF?
All LT3761EMSE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761EMSE-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 LT3761EMSE-1#PBF part is unused and in its original packaging.
Return procedure for LT3761EMSE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3761EMSE-1#PBF Tags
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