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Analog Devices Inc. LT3761IMSE#PBF
- Part No.:
- LT3761IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761IMSE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,116
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Product details
Overview
LT3761IMSE#PBF from Analog Devices (formerly Linear Technology) 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 delivers ±3% constant-current regulation and ±2% constant-voltage regulation with rail-to-rail high-side or low-side current sensing up to 80V, supporting automotive headlamps and industrial lighting systems.
For engineers reviewing the LT3761IMSE#PBF datasheet, LT3761IMSE#PBF pinout, LT3761IMSE#PBF application, or LT3761IMSE#PBF equivalent, key selection considerations include its 100kHz–1MHz programmable switching frequency, integrated PWM dimming generator (4%–96% duty), 3000:1 True Color PWM™ dimming capability, and open-LED fault detection via dedicated OPENLED pin.
Technical Context
The LT3761IMSE#PBF implements fixed-frequency current-mode control with dual-loop regulation: the ISP/ISN differential input governs constant-current operation (full-scale threshold 250mV, adjustable via CTRL pin from 0V to 1.0V), while FB regulates output voltage at 1.25V nominal. Its transconductance error amplifier (VC pin) integrates loop compensation and stores demand state during PWM idle periods.
Internal protection includes ISP–ISN overcurrent detection at 600mV, FB overvoltage shutdown (>VFB + 60mV), open-LED latching (FB < VFB – 50mV & VISP–ISN < 25mV), and thermal shutdown at 165°C. The INTVCC LDO (7.85V, 36mA max) powers gate drivers and internal logic, with UVLO on EN/UVLO (1.22V falling, 20mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V - supports wide-input industrial and automotive power rails without external pre-regulation. |
| Current Sense Range | 0V to 80V rail-to-rail - enables high-side sensing of grounded-anode LED strings >100V. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor; allows optimization of efficiency, EMI, and magnetics size. |
| Constant-Current Accuracy | ±3% - tight regulation critical for uniform LED brightness and thermal management. |
| PWM Dimming Ratio | Up to 3000:1 - True Color PWM™ preserves color fidelity across full dimming range. |
| Shutdown Current | <1µA - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
| Package | 16-Lead MSOP with exposed pad - thermally enhanced for high-power LED driver applications. |
Pinout & Package
LT3761IMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP package (MSE) with an exposed GND pad (Pin 17) that must be soldered to the PCB ground plane for thermal and electrical integrity. θJA = 43°C/W, θJC = 4°C/W, TJMAX = 125°C (I-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output / FB overvoltage fault indicator | Drives NMOS disconnect FET; toggles low if FB exceeds VFB + 60mV to protect LEDs from overvoltage. |
| FB (2) | Voltage feedback input | Sets constant-voltage regulation point at 1.25V; enables open-LED detection when combined with ISP/ISN monitoring. |
| ISN (3) | Negative current sense input | Completes high-side or low-side current sense path; bias current varies with CTRL voltage and ISP level. |
| ISP (4) | Positive current sense input | Measures differential voltage across sense resistor; triggers overcurrent shutdown if ISP–ISN > 600mV. |
| VC (5) | Error amplifier output | High-impedance during PWM idle; stores demand current state; requires RC network for loop stability. |
| CTRL (6) | Analog dimming / current threshold adjust | Linearly scales ISP–ISN regulation threshold from 21mV to 250mV (0V–1.0V); disables analog dimming above 1.2V. |
| VREF (7) | 2.02V reference output | Supplies up to 185µA; used to bias CTRL divider for analog dimming or temperature compensation. |
| PWM (8) | Digital dimming input / oscillator enable | Accepts external PWM signal or self-oscillates with capacitor; sets dimming frequency and duty via DIM/SS current. |
| OPENLED (9) | Open-circuit fault indicator (LT3761 only) | Open-drain output pulled low when FB < VFB – 50mV AND VISP–ISN < 25mV; requires external pull-up. |
| DIM/SS (10) | Soft-start / PWM generator programming | 12µA internal pull-up sets PWMOUT duty ratio; capacitor value determines soft-start time and dimming frequency. |
| RT (11) | Frequency adjustment | Resistor to GND programs switching frequency from 100kHz to 1MHz per published curve. |
| EN/UVLO (12) | Enable / input undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.3µA pull-down enables precise external hysteresis design. |
| INTVCC (13) | Internally regulated supply | 7.85V LDO (36mA max); powers gate drivers and logic; requires 1µF ceramic bypass to exposed GND pad. |
| VIN (14) | Main power input | Supplies INTVCC LDO; requires local 0.22µF+ low-ESR ceramic bypass near pin and exposed pad. |
| SENSE (15) | Switch current sense input | Kelvin-connected to source of external NFET; monitors peak switch current; clamped at 105mV typical limit. |
| GATE (16) | N-channel MOSFET driver output | Swings between INTVCC and GND; drives external power switch; forced low during fault or shutdown. |
| GND (17) | Power and signal ground / exposed pad | Common return for SENSE, ISN, and internal circuitry; must be soldered to PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 dimming ratio with no color shift-achieved via synchronized internal PWM generator and precise timing control. |
| Programmable switching frequency | 100kHz–1MHz via single RT resistor-enables EMI optimization and compact magnetics without changing layout. |
| High-side or low-side current sensing | Rail-to-rail 0V–80V common-mode range-supports grounded-anode LED strings and battery charging configurations. |
| Integrated open-LED protection | Dedicated OPENLED pin asserts low when FB drops below VFB – 50mV and VISP–ISN falls below 25mV-enables system-level fault reporting. |
| Low shutdown IQ | <1µA quiescent current-critical for always-on automotive lighting and energy-harvesting applications. |
| Thermally robust MSOP package | Exposed pad with θJC = 4°C/W-delivers reliable thermal performance in high-current LED driver designs. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving high-brightness LED arrays in 12V/24V/48V vehicle electrical systems with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Constant-current controller managing boost topology with 3000:1 PWM dimming and open-circuit fault signaling. Use Value: Maintains consistent lumen output across battery voltage swings (4.5V–60V) and enables adaptive front-lighting system (AFS) beam shaping. |
Use Scenario: Powering multi-string LED fixtures in warehouses and factories requiring long-life, high-efficiency illumination. IC Role / Device Role / Timing Role: SEPIC or buck-boost controller delivering stable current to parallel LED strings with C/10 battery charge indication capability. Use Value: Eliminates need for external current-sense amplifiers and provides built-in short-circuit and open-LED protection for unattended operation. |
| UV-C Disinfection Systems | Battery-Powered Portable Lighting |
|
Use Scenario: Driving high-voltage UV-C LED strings (≥100V) from 24V industrial supplies with precise current control. IC Role / Device Role / Timing Role: High-side current-sense controller enabling grounded-anode configuration for simplified thermal management of UV emitters. Use Value: Achieves >94% efficiency in boost mode while maintaining ±3% current accuracy critical for germicidal dose consistency. |
Use Scenario: Compact LED flashlights or inspection lamps powered by Li-ion or 18650 cells with runtime extension via analog + PWM dimming. IC Role / Device Role / Timing Role: Dual-dimming controller using CTRL pin for smooth analog dimming and PWM pin for high-ratio digital dimming. Use Value: Extends battery life with <1µA shutdown current and enables intuitive user interface with multi-level brightness control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EMSE#PBF | Wider VIN range (4.5V–100V), no integrated PWM generator, requires external oscillator; lacks OPENLED pin. | Preferred for ultra-high-voltage LED strings (>60V) where internal PWM generation is unnecessary. | Select when higher input voltage tolerance is required and external dimming control is already implemented. |
| LT3965EFE#PBF | 4-channel independent LED controller with I²C interface; fixed 500kHz frequency; no analog dimming via CTRL pin. | Targeted at RGBW or multi-zone lighting systems requiring digital addressability and channel synchronization. | Choose for complex color-mixing or smart lighting systems needing programmable per-channel current and fault reporting. |
Compared with LTC3783EMSE#PBF and LT3965EFE#PBF, the LT3761IMSE#PBF uniquely combines integrated True Color PWM™ generation, analog dimming via CTRL, and dedicated OPENLED fault signaling in a single 16-pin MSOP-making it optimal for cost-sensitive, high-reliability single-string LED drivers where board space and BOM count are constrained.
Availability
LT3761IMSE#PBF is available at Aetrix Electronics and suitable for automotive lighting, industrial high-bay fixtures, UV-C disinfection systems, and portable battery-powered LED applications requiring stable component supply and long-term manufacturability.
Supply support for LT3761IMSE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, formed through the acquisition of Linear Technology in 2017.
The LT3761IMSE#PBF belongs to ADI's legacy Linear Technology LED controller product line, engineered specifically for high-efficiency, high-reliability constant-current LED driving in demanding automotive and industrial environments.
FAQ
What is the operating temperature range for the LT3761IMSE#PBF?
The LT3761IMSE#PBF is rated for an operating ambient temperature range of –40°C to +125°C. This I-grade specification ensures reliable performance in under-hood automotive applications and industrial enclosures without active cooling. Junction temperature must not exceed 125°C, and the exposed pad must be soldered to a thermal pad for effective heat dissipation.
Does the LT3761IMSE#PBF support synchronization to an external clock?
No-the LT3761IMSE#PBF does not support external clock synchronization. That feature is exclusive to the LT3761-1 variant (e.g., LT3761IMSE-1#PBF), which replaces the OPENLED pin with a SYNC pin. The LT3761IMSE#PBF uses the OPENLED pin for open-circuit LED fault reporting and relies solely on its internal RT-programmed oscillator.
How is analog dimming implemented on the LT3761IMSE#PBF?
Analog dimming on the LT3761IMSE#PBF is controlled via the CTRL pin (Pin 6), which linearly adjusts the ISP–ISN current sense threshold from 21mV to 250mV over 0V–1.0V input. At CTRL = 0.5V, for example, the regulation threshold is ~100mV, reducing LED current proportionally. For full-scale regulation, apply ≥1.2V to CTRL; below 0.1V, dimming becomes non-linear and unstable.
Can the LT3761IMSE#PBF drive LEDs in buck configuration?
Yes-the LT3761IMSE#PBF supports buck, boost, SEPIC, inverting, buck-boost, and flyback topologies. In buck mode, it regulates LED current using low-side current sensing (ISN tied to GND, ISP to sense resistor high side) and requires the LED cathode to be connected to VIN. The controller maintains ±3% current accuracy and provides open-LED detection via FB monitoring.
What protection features are integrated into the LT3761IMSE#PBF?
The LT3761IMSE#PBF integrates multiple hardware-based protections: ISP–ISN overcurrent shutdown (>600mV), FB overvoltage latch-off (>VFB + 60mV), open-LED detection (FB < VFB – 50mV & VISP–ISN < 25mV), thermal shutdown at 165°C, and EN/UVLO with programmable hysteresis. All protections trigger immediate GATE and PWMOUT shutdown and are active without firmware or external components.
LT3761IMSE#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
LT3761IMSE#PBF FAQ
1.How can I place an order for LT3761IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761IMSE#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 LT3761IMSE#PBF reliable?
The price and inventory of LT3761IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3761IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761IMSE#PBF?
LT3761IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761IMSE#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 LT3761IMSE#PBF?
For technical support, including LT3761IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761IMSE#PBF requirements.
6.How does Aetrix verify that LT3761IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3761IMSE#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 LT3761IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3761IMSE#PBF?
All LT3761IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761IMSE#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 LT3761IMSE#PBF part is unused and in its original packaging.
Return procedure for LT3761IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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