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Analog Devices Inc. LT3761EMSE#TRPBF
- Part No.:
- LT3761EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761EMSE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,326
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Product details
Overview
LT3761EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 4.5V–60V input, constant-current/constant-voltage DC/DC controller for high-power LED drivers and battery chargers. It integrates a programmable internal PWM dimming generator (4%–96% duty), rail-to-rail high-side/low-side current sensing (0V–80V), and ±3% current regulation accuracy. It operates in boost, SEPIC, inverting, buck-boost, or flyback topologies - used in automotive headlamps requiring >25:1 internal PWM dimming and 94% efficiency.
For engineers reviewing the LT3761EMSE#TRPBF datasheet, LT3761EMSE#TRPBF pinout, LT3761EMSE#TRPBF application, or LT3761EMSE#TRPBF equivalent, key selection criteria include its 100kHz–1MHz adjustable switching frequency, open-LED protection with dedicated OPENLED pin, thermally enhanced 16-lead MSOP package, and support for True Color PWM™ dimming up to 3000:1 when driven externally.
Technical Context
The LT3761EMSE#TRPBF employs fixed-frequency current-mode control with slope compensation, enabling stable operation across wide VIN (4.5V–60V) and output voltage ranges. Its dual-loop architecture simultaneously regulates LED current via ISP/ISN differential sensing (full-scale threshold 250mV) and output voltage via FB (1.25V reference), with automatic loop dominance management.
It features an integrated INTVCC LDO (7.85V, 36mA), programmable soft-start via DIM/SS pin, and fault protection including overcurrent (600mV ISP–ISN), FB overvoltage (VFB + 60mV), and thermal shutdown (>165°C). The LT3761 variant (not LT3761-1) includes OPENLED status reporting and lacks SYNC capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V - supports direct connection to automotive battery (12V/24V/48V systems) without pre-regulation |
| Current Sense Range | Rail-to-rail 0V to 80V - enables high-side sensing of grounded-anode LED strings >100V |
| Switching Frequency | 100kHz to 1MHz (RT-programmable) - allows optimization of efficiency vs. size using 10nH–10µH inductors |
| Current Regulation Accuracy | ±3% - ensures consistent LED brightness across temperature and line/load variations |
| Internal PWM Dimming | 4% to 96% duty, 300Hz typical - provides flicker-free analog-like dimming without external oscillator |
| Open LED Detection | FB < VFB – 50mV AND ISP–ISN < 25mV - latched OPENLED pin assertion for system-level fault signaling |
| Shutdown Current | <1µA - enables ultra-low-power standby in always-on lighting or battery backup systems |
Pinout & Package
LT3761EMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4mm) with exposed pad (Pin 17) soldered to PCB ground 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 external NMOS disconnect switch; toggles low if FB > VFB + 60mV to protect LEDs from overvoltage |
| FB (2) | Voltage feedback input | Sets constant-voltage regulation point at 1.25V; enables open-LED detection and overvoltage shutdown |
| 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 | Accepts up to 80V common-mode; overcurrent detected if ISP–ISN > 600mV (typical) |
| VC (5) | Error amplifier output | High-impedance during PWM low; stores demand state on external RC network for fast transient response |
| CTRL (6) | Current sense threshold adjust | Linearly scales VISP–ISN from 25mV to 250mV (0V–1V); clamped at full scale above 1.2V |
| VREF (7) | 2.02V precision reference output | Supplies up to 185µA; used to bias CTRL divider for analog dimming or thermal compensation |
| PWM (8) | Digital dimming input / self-oscillator enable | Accepts external PWM signal (3000:1 ratio) or drives CPWM to generate internal dimming waveform |
| OPENLED (9) | Open-drain fault status output | Asserts low when open-LED condition detected; requires external pull-up to INTVCC |
| DIM/SS (10) | Soft-start / PWM dimming current source | 12µA (typ) internal pull-up sets PWMOUT duty ratio; capacitor value defines soft-start time and dimming frequency |
| RT (11) | Frequency programming resistor | Resistor to GND sets switching frequency (e.g., 95.3kΩ → 100kHz; 8.87kΩ → 1MHz) |
| EN/UVLO (12) | Enable / undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.3µA pull-down enables precise UVLO hysteresis design |
| INTVCC (13) | Internally regulated supply | 7.85V LDO powers gate driver and logic; requires 1µF ceramic bypass close to pin and exposed pad |
| VIN (14) | Main power input | Bypass with ≥0.22µF ceramic capacitor; supplies INTVCC and internal circuitry |
| SENSE (15) | Switch current sense input | Kelvin-connected to source of external N-FET; monitors peak switch current for cycle-by-cycle limiting (105mV threshold) |
| GATE (16) | N-channel MOSFET driver output | Swings between INTVCC and GND; drives external power FET with 25ns rise/fall times (3300pF load) |
| GND (17) | Power and signal ground / exposed pad | Mandatory solder connection to PCB ground plane for thermal dissipation and current sense return path |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | Up to 3000:1 external dimming ratio preserves LED color fidelity without low-frequency flicker |
| Ground-referred current sensing | Supports high-voltage LED strings (>100V) with grounded anode configuration and no isolated sense amplifiers |
| Programmable C/10 charge termination | Uses ISP–ISN voltage threshold (25mV typ) to signal end-of-charge in Li-ion/supercapacitor applications |
| Output short-circuit protected boost | Automatic shutdown and 4µs forced low on GATE/PWMOUT if ISP–ISN > 600mV, preventing switch failure |
| Thermally robust MSOP package | Exposed pad reduces junction-to-board thermal resistance to 4°C/W, enabling 125°C ambient operation |
| Analog dimming via CTRL pin | 0V–1V linear control of LED current threshold enables smooth, noise-immune brightness adjustment |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 60W white LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current controller regulating 1.5A through 40V LED string; uses OPENLED pin for real-time fault reporting to vehicle ECU. Use Value: 94% efficiency at 350kHz minimizes thermal load in confined headlamp housing; 25:1 internal PWM enables seamless daytime running light (DRL) to full-beam transitions. |
Use Scenario: Powering 100–200W multi-string LED fixtures in warehouse ceilings with 0–10V dimming interface. IC Role / Device Role / Timing Role: Boost-mode LED driver with analog dimming (CTRL pin) and digital PWM override; FB loop maintains 48V bus stability during dimming transients. Use Value: Rail-to-rail 0V–80V current sense range allows direct high-side sensing of grounded-anode strings, eliminating isolation components and reducing BOM cost by 12%. |
| Li-ion Battery Chargers | UV-C Sterilization Modules |
Use Scenario: Charging 12S Li-ion packs (42–50.4V) with CC/CV profile and C/10 termination detection. IC Role / Device Role / Timing Role: Constant-current source (CC phase) transitioning to constant-voltage (CV phase); uses FB pin for voltage regulation and ISP–ISN for C/10 cutoff at 25mV. Use Value: Integrated C/10 threshold eliminates need for external comparator and reference, reducing solution footprint by 35% versus discrete charger ICs. |
Use Scenario: Driving high-current 275nm UV-C LEDs in portable disinfection wands requiring precise irradiance control. IC Role / Device Role / Timing Role: SEPIC-mode driver delivering 700mA at 35V with 3000:1 external PWM dimming to modulate germicidal dose without spectral shift. Use Value: True Color PWM™ preserves 275nm peak wavelength across full dimming range, ensuring consistent microbial inactivation efficacy per IEC 62471. |
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 gate drivers | Targets high-efficiency, high-current DC-DC conversion (e.g., 12V–48V telecom), not LED-specific protection features | Select when designing multi-phase, high-power (>200W) non-LED loads where efficiency >96% and low EMI are critical |
| MAX20051ATPA/VY+ | Automotive-grade 60V LED controller with integrated high-side switch; fixed 2.2MHz frequency; no OPENLED pin | Optimized for space-constrained automotive interior lighting; lacks programmable dimming generator and C/10 charging support | Select for ASIL-B compliant AFS modules where board area is constrained and external FETs are undesirable |
Compared with LTC3789EMSE#TRPBF and MAX20051ATPA/VY+, the LT3761EMSE#TRPBF uniquely combines LED-specific protections (OPENLED, C/10, True Color PWM™), flexible topology support (boost/SEPIC/flyback), and rail-to-rail current sensing - making it optimal for high-reliability, multi-function LED and charger designs where feature integration reduces system complexity.
Availability
LT3761EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, industrial LED drivers, and battery charging systems requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LT3761EMSE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing (DSP) technologies, formed through the acquisition of Linear Technology in 2017.
The LT3761EMSE#TRPBF belongs to ADI's Power by Linear™ portfolio of high-voltage DC/DC controllers, designed specifically for demanding LED illumination and energy storage applications requiring precision current regulation, robust fault protection, and wide-input operation.
FAQ
What is the maximum input voltage rating for the LT3761EMSE#TRPBF?
The LT3761EMSE#TRPBF has an absolute maximum VIN rating of 60V, with guaranteed operation from 4.5V to 60V. This allows direct connection to 48V industrial buses and automotive 12V/24V systems with transient tolerance. Exceeding 60V may cause permanent damage per Absolute Maximum Ratings.
Does the LT3761EMSE#TRPBF support synchronization to an external clock?
No - the LT3761EMSE#TRPBF is the standard variant and does not include SYNC functionality. Only the LT3761-1 family (e.g., LT3761EMSE-1#TRPBF) features a dedicated SYNC pin. Using LT3761EMSE#TRPBF with an external clock requires external gating of the PWM pin and forfeits internal oscillator synchronization benefits.
How is open-LED fault detection implemented in the LT3761EMSE#TRPBF?
The LT3761EMSE#TRPBF asserts the OPENLED pin low when two conditions occur simultaneously: FB voltage falls below VFB – 50mV (≈1.205V) AND the ISP–ISN differential drops below 25mV (C/10 threshold). This dual-condition logic prevents false triggers during CV-mode regulation or transient load steps, ensuring reliable fault reporting in LED systems.
Can the LT3761EMSE#TRPBF be used in buck configuration?
Yes - the LT3761EMSE#TRPBF 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) and FB feedback for output voltage clamping. Layout must maintain Kelvin connections to SENSE and GND pins for accurate current control.
What is the purpose of the DIM/SS pin on the LT3761EMSE#TRPBF?
The DIM/SS pin on the LT3761EMSE#TRPBF serves dual functions: (1) soft-start timing via external capacitor charging with 12µA internal current source, and (2) setting internal PWM dimming frequency and duty ratio. Its voltage determines PWMOUT waveform characteristics - e.g., 47nF on PWM pin yields ~300Hz dimming with duty set by DIM/SS current.
LT3761EMSE#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
LT3761EMSE#TRPBF FAQ
1.How can I place an order for LT3761EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761EMSE#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 LT3761EMSE#TRPBF reliable?
The price and inventory of LT3761EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3761EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761EMSE#TRPBF?
LT3761EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761EMSE#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 LT3761EMSE#TRPBF?
For technical support, including LT3761EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3761EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3761EMSE#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 LT3761EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3761EMSE#TRPBF?
All LT3761EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761EMSE#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 LT3761EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3761EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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