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Analog Devices Inc. LT3761AEMSE#TRPBF
- Part No.:
- LT3761AEMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761AEMSE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,786
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Product details
Overview
LT3761AEMSE#TRPBF 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 ratio, and supports rail-to-rail high-side or low-side current sensing up to 80V common-mode range. It is deployed in automotive headlamps requiring 25:1 internal PWM dimming and >100V LED strings.
For engineers reviewing the LT3761AEMSE#TRPBF datasheet, LT3761AEMSE#TRPBF pinout, LT3761AEMSE#TRPBF application, or LT3761AEMSE#TRPBF equivalent, key selection criteria include its 100kHz–1MHz adjustable switching frequency, 3000:1 external PWM dimming ratio, C/10 battery charge termination capability, open-LED fault reporting via OPENLED pin, and thermally enhanced 16-lead MSOP package with exposed GND pad.
Technical Context
The LT3761AEMSE#TRPBF implements a fixed-frequency, current-mode control architecture with dual-loop regulation: the ISP/ISN differential input governs constant-current mode via a transconductance error amplifier (VC), while FB regulates constant-voltage mode with 1.25V reference. Its internal PWM generator uses DIM/SS pin current to set pull-up/pull-down currents on the PWM pin, enabling self-oscillating dimming at 215–400Hz with 3.2%–97% duty ratio.
Protection logic integrates multiple independent fault responses: ISP–ISN overcurrent (>600mV) forces GATE/PWMOUT low for ≥4µs; FB overvoltage (>VFB + 60mV) toggles PWMOUT regardless of PWM state; and open-LED detection asserts OPENLED when FB < VFB – 50mV AND ISP–ISN < 25mV. The INTVCC LDO (7.85V, 42mA max) powers gate drivers and internal circuitry, with UVLO hysteresis set by EN/UVLO pin bias current (2.3µA typical pull-down).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V - supports wide-input industrial and automotive power rails without pre-regulation. |
| Current Sense Range | 0V to 80V common-mode - enables high-side sensing for grounded-anode LED strings or battery chargers. |
| Constant-Current Accuracy | ±3% - ensures precise LED brightness control and battery charge current limiting. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor to balance efficiency, EMI, and external component size. |
| PWM Dimming Ratio | Up to 3000:1 - achieved with external signal; preserves LED color fidelity via True Color PWM™. |
| Thermal Package | 16-Lead MSOP with exposed GND pad (θJC = 4°C/W) - enables high-power operation up to 125°C ambient. |
| Shutdown Current | <1µA - meets ultra-low-power requirements in always-on automotive or IoT systems. |
Pinout & Package
LT3761AEMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed GND pad (Pin 17), requiring soldering to PCB ground plane for thermal and electrical integrity (θJA = 43°C/W, θJC = 4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output / FB overvoltage fault indicator | Drives NMOS disconnect switch; 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 Kelvin connection to current-sense resistor; bias current varies with CTRL voltage and ISP level. |
| ISP (4) | Positive current sense input | High-side or low-side sensing node; overcurrent detection triggers at ISP–ISN > 600mV. |
| VC (5) | Error amplifier output | Integrates current/voltage error; high-impedance during PWM low to retain state across cycles. |
| CTRL (6) | Current threshold adjustment | Linearly scales ISP–ISN regulation threshold from 21mV to 258mV (0–1V input); full-scale at >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 | Self-oscillates with external capacitor; duty ratio set by DIM/SS current; first rising edge enables startup. |
| OPENLED (9) | Open-drain fault status output | Pulled low when FB < VFB – 50mV AND ISP–ISN < 25mV; requires external pull-up to INTVCC. |
| DIM/SS (10) | Soft-start / PWM generator programming | 14µA internal pull-up sets PWM duty; capacitor to GND defines 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 / undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.3µA pull-down enables precise external hysteresis design. |
| INTVCC (13) | Internal LDO output | 7.85V, 42mA regulated supply for gate drivers; bypass with 1µF ceramic capacitor near IC. |
| VIN (14) | Main power input | Supplies INTVCC LDO and internal circuitry; requires local 0.22µF low-ESR ceramic bypass. |
| SENSE (15) | Switch current sense input | Kelvin-connected to source of external NMOS; monitors peak switch current with 105mV limit threshold. |
| GATE (16) | NMOS gate driver output | Drives external power FET between INTVCC and GND; pulled low during shutdown/fault/idle. |
| GND (17) | Power and signal ground | Exposed pad must be soldered to PCB ground plane for thermal management and current sense return path. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | Preserves LED chromaticity at dim levels via synchronized, high-resolution external PWM control up to 3000:1. |
| Rail-to-rail current sense | Supports 0V–80V common-mode range - enables direct high-side sensing for grounded-anode LED strings >100V. |
| Integrated C/10 charge termination | Asserts OPENLED when ISP–ISN drops below 25mV during battery charging - provides reliable end-of-charge signal. |
| Output short-circuit protection | Forces GATE/PWMOUT low for ≥4µs upon ISP–ISN > 600mV - protects external FET and inductor from destructive current. |
| Programmable soft-start | DIM/SS pin capacitor sets controlled ramp-up of output current - prevents inrush stress on LEDs and capacitors. |
| Thermally robust MSOP package | Exposed GND pad reduces junction-to-case thermal resistance to 4°C/W - sustains 125°C ambient operation with proper layout. |
Applications
| Automotive Headlamp Driver | Battery Charger with C/10 Termination |
|---|---|
Use Scenario: Driving high-brightness LED arrays in vehicle forward lighting with adaptive beam control. IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current; internal PWM generator provides 25:1 dimming for DRL and low-beam modes. Use Value: Enables compliance with ECE R149 photometric requirements using single IC, eliminating need for external dimming controllers. |
Use Scenario: Charging 12V/24V lead-acid or LiFePO₄ batteries in backup power systems with precise end-of-charge detection. IC Role / Device Role / Timing Role: Constant-current/constant-voltage regulator with C/10 threshold monitoring on ISP/ISN to signal full charge. Use Value: Eliminates separate fuel-gauge IC by using built-in current-sense comparator to assert OPENLED at C/10 current level. |
| Industrial High-Voltage LED String Supply | Capacitor Charger for Pulsed Power Systems |
Use Scenario: Powering >100V LED strings in signage or horticultural lighting where anode is grounded for safety. IC Role / Device Role / Timing Role: High-side current sense controller in boost configuration; FB loop maintains output voltage during dimming transients. Use Value: Achieves grounded-anode topology without level-shifting circuitry - simplifies EMI filtering and improves system reliability. |
Use Scenario: Charging high-voltage supercapacitors in energy harvesting or pulse-laser power supplies. IC Role / Device Role / Timing Role: Constant-current source with programmable voltage limit; OPENLED signals capacitor voltage threshold crossing. Use Value: Integrates precision current regulation and voltage clamping in one device - replaces discrete op-amp/comparator solutions. |
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 | 4-phase synchronous buck-boost controller; no integrated PWM generator; requires external MOSFETs and gate drivers. | Targets higher-efficiency, multi-phase battery-powered systems; lacks C/10 termination and OPENLED reporting. | Select when >95% efficiency at 5A+ is required and external PWM dimming is acceptable. |
| LT3965EFE#TRPBF | 8-channel 3.5A LED driver with I²C interface; fixed 2MHz switching; no high-side current sense or >60V VIN support. | Designed for RGBW architectural lighting with digital addressability; unsuitable for >100V strings or battery charging. | Select for distributed, digitally controlled LED arrays where channel count and I²C simplicity outweigh voltage range needs. |
Compared with LTC3789EMSE#TRPBF and LT3965EFE#TRPBF, the LT3761AEMSE#TRPBF uniquely combines 60V VIN, 80V current sense, internal PWM generation, C/10 battery termination, and OPENLED fault reporting in a single 16-pin MSOP - making it optimal for cost-sensitive, high-voltage LED and charger designs requiring minimal external components.
Availability
LT3761AEMSE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial LED signage, battery charging modules, and supercapacitor charging circuits requiring stable component supply across extended temperature ranges.
Supply support for LT3761AEMSE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3761A product line was designed specifically for high-reliability LED current regulation and battery charging applications requiring wide input voltage range, precise current accuracy, and integrated fault protection - targeting automotive lighting and industrial power systems.
FAQ
What is the maximum input voltage rating for LT3761AEMSE#TRPBF?
The LT3761AEMSE#TRPBF has an absolute maximum VIN rating of 60V, with guaranteed operation from 4.5V to 60V. Exceeding 60V may cause permanent damage. The device's rail-to-rail current sense inputs (ISP/ISN) tolerate up to 80V common-mode voltage, enabling safe high-side sensing in boost configurations delivering >100V output.
How does LT3761AEMSE#TRPBF achieve 3000:1 PWM dimming?
The LT3761AEMSE#TRPBF achieves 3000:1 dimming ratio using external PWM signals applied to the PWM pin, not its internal generator. When driven by a clean digital signal capable of sourcing/sinking 200µA, the IC modulates switcher duty cycle directly. Its True Color PWM™ architecture preserves LED color consistency across the full range, unlike analog dimming which shifts chromaticity.
Can LT3761AEMSE#TRPBF be used for battery charging applications?
Yes, the LT3761AEMSE#TRPBF is explicitly designed for battery and supercapacitor charging. Its constant-current/constant-voltage regulation, C/10 current threshold detection (asserting OPENLED at ~10% charge current), and ISP/ISN overcurrent protection make it suitable for lead-acid, LiFePO₄, and NiMH charging systems - confirmed in the official datasheet Applications section.
What is the purpose of the exposed pad (Pin 17) on LT3761AEMSE#TRPBF?
The exposed pad (Pin 17) on LT3761AEMSE#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve specified thermal performance (θJC = 4°C/W) and provide the return path for current-sense resistor current. Leaving it unconnected degrades thermal dissipation and compromises current-sense accuracy and reliability.
Does LT3761AEMSE#TRPBF support both high-side and low-side current sensing?
Yes, the LT3761AEMSE#TRPBF supports both configurations. High-side sensing connects the current-sense resistor between LED cathode and ISP/ISN, enabling grounded-anode LED strings. Low-side sensing places the resistor between ISN and GND. The datasheet confirms rail-to-rail 0V–80V common-mode range and specifies bias current behavior for both cases across CTRL voltage and ISP/ISN voltage conditions.
LT3761AEMSE#TRPBF 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:
- 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):
- 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
LT3761AEMSE#TRPBF FAQ
1.How can I place an order for LT3761AEMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761AEMSE#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 LT3761AEMSE#TRPBF reliable?
The price and inventory of LT3761AEMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761AEMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3761AEMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761AEMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761AEMSE#TRPBF?
LT3761AEMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761AEMSE#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 LT3761AEMSE#TRPBF?
For technical support, including LT3761AEMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761AEMSE#TRPBF requirements.
6.How does Aetrix verify that LT3761AEMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3761AEMSE#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 LT3761AEMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3761AEMSE#TRPBF?
All LT3761AEMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761AEMSE#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 LT3761AEMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3761AEMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3761AEMSE#TRPBF Tags
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