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Analog Devices Inc. LT3761AIMSE#PBF
- Part No.:
- LT3761AIMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761AIMSE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,209
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Product details
Overview
LT3761AIMSE#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, buck-boost, inverting, and flyback topologies. It delivers ±3% constant-current regulation and ±2% constant-voltage regulation, features internal PWM dimming with 4%–96% programmable duty cycle, supports rail-to-rail current sense (0V–80V), and operates across –40°C to 125°C ambient temperature.
For engineers reviewing the LT3761AIMSE#PBF datasheet, LT3761AIMSE#PBF pinout, LT3761AIMSE#PBF application, or LT3761AIMSE#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed LED driver specifications including 3000:1 True Color PWM™ dimming, and real-world implementation constraints for automotive headlamps, battery chargers, and high-voltage LED strings.
Technical Context
The LT3761AIMSE#PBF implements a fixed-frequency current-mode control architecture with dual-loop regulation: the ISP/ISN differential input governs constant-current operation via a transconductance error amplifier (VC), while FB regulates constant-voltage output using a 1.25V reference. Its internal PWM generator uses DIM/SS current to set PWMOUT duty ratio (4%–96%) and frequency (215–400Hz), independent of main switching frequency (100kHz–1MHz).
Protection logic integrates open-LED detection (FB < VFB – 50mV AND VISP–ISN < 25mV), FB overvoltage shutdown (FB > VFB + 60mV), and ISP/ISN overcurrent latch-off (VISP–ISN > 600mV), all triggering GATE and PWMOUT low with 15mA DIM/SS pull-down for ≥4µs. The IC powers internal drivers from an internally regulated 7.85V INTVCC supply with 36mA current limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V - supports wide-input automotive, industrial, and battery-powered systems without external pre-regulation. |
| Current Sense Range | Rail-to-rail 0V to 80V - enables high-side or low-side sensing for grounded-anode LEDs or >100V LED strings. |
| Constant-Current Accuracy | ±3% - ensures precise LED brightness control across temperature and line/load variations. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor to balance efficiency, EMI, and external component size. |
| PWM Dimming Ratio | 3000:1 True Color PWM™ - preserves color fidelity in LED applications when driven by external signal. |
| Internal PWM Duty Range | 4% to 96% - programmable via DIM/SS current for self-oscillating dimming without external clock. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and harsh industrial environments. |
| Package | 16-Lead Plastic MSOP with exposed pad - thermally enhanced for high-power LED driver thermal management. |
Pinout & Package
LT3761AIMSE#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 performance (θJA = 43°C/W). The exposed pad is electrically connected to GND and serves as the current-sense return for the SENSE pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output / Fault indicator | Drives external NMOS disconnect FET; toggles low during FB overvoltage (>VFB + 60mV) to isolate LED load. |
| 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 voltage drop across external sense resistor; triggers overcurrent protection if >600mV above ISN. |
| VC (5) | Error amplifier output | Integrates demand current state; high-impedance during PWM low to retain compensation capacitor charge. |
| CTRL (6) | Current threshold adjustment | Linearly scales VISP–ISN target from 21mV (0.2V) to 250mV (≥1.2V); sets analog dimming range. |
| 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; first rising edge after start-up initiates switching. |
| OPENLED (9) | Open-load status indicator | Open-drain output pulled low when FB < VFB – 50mV AND VISP–ISN < 25mV; requires external pull-up. |
| DIM/SS (10) | Soft-start / PWM generator control | Charging current sets PWMOUT duty/frequency; resets on UVLO, overcurrent, or thermal fault. |
| RT (11) | Frequency programming | Resistor to GND sets switching frequency from 100kHz to 1MHz; values specified in datasheet curves. |
| EN/UVLO (12) | Enable / input undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.3µA pull-down enables precise hysteresis resistor selection. |
| INTVCC (13) | Internal LDO output | 7.85V regulated supply for gate drivers; requires 1µF ceramic bypass close to pin and exposed pad. |
| VIN (14) | Main power input | Supplies INTVCC regulator and internal circuitry; requires local 0.22µF+ low-ESR ceramic bypass. |
| SENSE (15) | Switch current sense input | Kelvin-connected to source of external N-FET; monitors peak switch current for current-mode control. |
| GATE (16) | N-channel MOSFET driver | Drives external power FET between INTVCC and GND; forced low during shutdown, fault, or idle. |
| GND (17) | Power and signal ground | Exposed pad must be soldered to PCB ground plane; serves as SENSE return and current-sense reference. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 external dimming ratio preserves LED chromaticity without color shift, critical for automotive lighting. |
| Programmable internal PWM generator | DIM/SS current sets PWMOUT duty (4%–96%) and frequency (215–400Hz), eliminating need for external oscillator. |
| High-voltage current sense | Rail-to-rail 0V–80V ISP/ISN common-mode range supports >100V LED strings with ground-referred sensing. |
| Dual-loop protection architecture | Independent open-LED (FB + ISP/ISN), FB overvoltage, and ISP/ISN overcurrent detection with coordinated latch-off. |
| Thermally robust MSOP package | Exposed pad GND connection achieves θJA = 43°C/W, enabling reliable operation at full load in compact layouts. |
| C/10 charging indication | Integrated C/10 threshold (25mV typical) on ISP/ISN enables accurate end-of-charge detection for Li-ion and supercapacitor chargers. |
Applications
| Automotive Headlamp Driver | Battery & Supercapacitor Charger |
|---|---|
|
Use Scenario: Driving high-brightness white LED arrays in vehicle forward lighting with adaptive beam control. IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current up to several amps in boost topology; PWMOUT controls external disconnect FET for safety-critical load isolation. Use Value: 94% efficient operation at 350kHz, 3000:1 True Color PWM™ dimming, and open-LED reporting meet OEM functional safety and photometric requirements. |
Use Scenario: Charging 12V–48V Li-ion packs or large supercapacitors from variable automotive or solar inputs. IC Role / Device Role / Timing Role: Constant-current/constant-voltage regulator with C/10 termination detection; CTRL pin adjusts charge current, FB regulates float voltage. Use Value: ±3% current accuracy and ±2% voltage accuracy ensure cell-level consistency; rail-to-rail current sense accommodates wide battery voltage ranges. |
| Industrial High-Voltage LED String | Grounded-Anode LED Lighting System |
|
Use Scenario: Powering >100V LED strings in streetlight or horticultural lighting using high-side current sensing. IC Role / Device Role / Timing Role: Boost controller with ISP/ISN inputs referenced to VIN; GATE drives external N-FET; OPENLED reports string integrity. Use Value: 0V–80V ISP/ISN common-mode range eliminates need for isolated sense amplifiers, reducing BOM cost and complexity. |
Use Scenario: Architecting cost-sensitive LED fixtures where LEDs are connected anode-to-ground for simplified thermal management. IC Role / Device Role / Timing Role: Inverting or buck-boost controller with low-side current sensing at ISN; PWMOUT drives cathode-side NMOS for dimming. Use Value: Ground-referenced current sense simplifies PCB layout and reduces component count versus high-side solutions. |
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 | Wider VIN range (4.5V–100V), no integrated PWM generator, requires external oscillator for dimming. | Better suited for ultra-high-input industrial systems; lacks self-oscillating dimming and C/10 charging function. | Select when input exceeds 60V or when external timing control is preferred over internal PWM generation. |
| LT3965EFE#PBF | 4-channel synchronized LED driver with I²C interface; fixed 200kHz–2MHz frequency; no analog CTRL dimming. | Designed for multi-string RGBW systems with digital addressability; not suitable for single-string high-current charging. | Select for digitally controlled multi-string architectures requiring channel synchronization and diagnostics. |
Compared with LTC3783EFE#PBF and LT3965EFE#PBF, the LT3761AIMSE#PBF uniquely combines internal PWM dimming, C/10 charging indication, and rail-to-rail current sense in a single 16-pin MSOP-making it optimal for cost-sensitive, high-reliability LED driver and charger designs where analog control and self-contained timing are required.
Availability
LT3761AIMSE#PBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial LED lighting, battery charging modules, and high-voltage power supplies requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for LT3761AIMSE#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) acquired Linear Technology in 2017 and maintains its legacy precision analog and power management product lines with full datasheet, simulation model, and application support.
The LT3761A product line was designed specifically for high-efficiency, high-reliability LED current regulation and battery charging in demanding environments-emphasizing accuracy, protection integration, and thermal robustness over generic DC/DC conversion.
FAQ
What is the maximum input voltage rating for the LT3761AIMSE#PBF?
The LT3761AIMSE#PBF has an absolute maximum VIN rating of 60V, with guaranteed operation from 4.5V to 60V. Exceeding 60V on VIN may cause permanent damage. The device's EN/UVLO pin allows programmable undervoltage lockout with hysteresis, and its internal INTVCC regulator operates stably across this full input range.
How does the LT3761AIMSE#PBF achieve 3000:1 dimming ratio?
The LT3761AIMSE#PBF achieves 3000:1 True Color PWM™ dimming when driven by an external PWM signal applied to the PWM pin. This high ratio preserves LED color fidelity by maintaining consistent current amplitude during each PWM on-cycle, unlike analog dimming which shifts chromaticity. Internal PWM generation offers up to 96:4 duty ratio but not 3000:1.
Can the LT3761AIMSE#PBF drive LEDs in buck configuration?
Yes, the LT3761AIMSE#PBF supports buck, boost, SEPIC, inverting, buck-boost, and flyback configurations per its datasheet. In buck mode, it regulates LED current using low-side sensing at ISN and SENSE, with GATE driving the high-side switch. Layout must maintain Kelvin connections and proper compensation for stability in each topology.
What is the purpose of the exposed pad (Pin 17) on the LT3761AIMSE#PBF?
The exposed pad (Pin 17) on the LT3761AIMSE#PBF is electrically connected to GND and serves as the primary thermal dissipation path and current-sense return node. It must be soldered to a PCB ground plane to achieve θJA = 43°C/W and ensure stable operation under full load. Leaving it unconnected degrades thermal performance and may cause malfunction.
Does the LT3761AIMSE#PBF support constant-voltage regulation for non-LED loads?
Yes, the LT3761AIMSE#PBF supports accurate constant-voltage regulation via the FB pin, with ±2% tolerance over temperature and line. When configured for CV mode (e.g., battery charging), it uses the same current-mode architecture but regulates FB to 1.25V. Open-LED detection and C/10 thresholds remain active, enabling smart charger implementations.
LT3761AIMSE#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
LT3761AIMSE#PBF FAQ
1.How can I place an order for LT3761AIMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761AIMSE#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 LT3761AIMSE#PBF reliable?
The price and inventory of LT3761AIMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761AIMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3761AIMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761AIMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761AIMSE#PBF?
LT3761AIMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761AIMSE#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 LT3761AIMSE#PBF?
For technical support, including LT3761AIMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761AIMSE#PBF requirements.
6.How does Aetrix verify that LT3761AIMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3761AIMSE#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 LT3761AIMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3761AIMSE#PBF?
All LT3761AIMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761AIMSE#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 LT3761AIMSE#PBF part is unused and in its original packaging.
Return procedure for LT3761AIMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3761AIMSE#PBF Tags
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