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Analog Devices Inc. LT3761EMSE#PBF
- Part No.:
- LT3761EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761EMSE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:15,304
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Product details
Overview
LT3761EMSE#PBF from Analog Devices (formerly Linear Technology) is a 4.5V to 60V input, constant-current/constant-voltage DC/DC controller optimized for high-current LED driving in boost, SEPIC, buck-boost, and flyback topologies. It integrates a programmable internal PWM dimming generator (4–96% duty), supports high-side or low-side current sensing up to 80V common-mode, and delivers ±3% current regulation accuracy with 1.25V FB reference and 105mV SENSE threshold.
For engineers reviewing the LT3761EMSE#PBF datasheet, LT3761EMSE#PBF pinout, LT3761EMSE#PBF application, or LT3761EMSE#PBF equivalent, key selection considerations include its 100kHz–1MHz adjustable switching frequency, 3000:1 True Color PWM™ dimming capability when driven externally, open-LED fault detection via OPENLED pin, and thermally enhanced 16-lead MSOP package with exposed GND pad.
Technical Context
The LT3761EMSE#PBF employs fixed-frequency current-mode control with slope compensation, enabling stable operation across wide VIN (4.5–60V) and output voltage ranges. Its dual-loop architecture simultaneously regulates LED current via ISP/ISN differential sensing (rail-to-rail 0–80V) and output voltage via FB feedback (1.25V reference), with automatic loop dominance management.
It features integrated analog dimming via CTRL pin (0–1.0V linear adjustment of current sense threshold), programmable soft-start and PWM dimming frequency via DIM/SS pin current, and robust protection including overcurrent (600mV ISP–ISN), open-LED (FB < VFB – 50mV & ISP–ISN < 25mV), and thermal shutdown. The GATE driver delivers fast 25ns rise/fall times into 3300pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V - supports automotive battery, industrial 24V/48V rails, and wide-input LED systems without pre-regulation. |
| Current Sense Range | Rail-to-rail 0V to 80V - enables high-side sensing for grounded-anode LED strings >100V and low-side sensing for cost-sensitive designs. |
| SENSE Threshold | 98–118mV - sets peak switch current limit; combined with external sense resistor, determines maximum output current accuracy (±3%). |
| FB Regulation Voltage | 1.225V to 1.275V - defines constant-voltage regulation point; used for battery charging, supercapacitor charging, or CV LED modes. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor; higher frequencies reduce inductor size but increase switching losses. |
| PWM Dimming Ratio | Up to 3000:1 - achieved with external PWM signal; preserves LED color fidelity versus analog dimming. |
| INTVCC Regulator | 7.6V to 8.05V @ 36mA - powers internal logic, GATE, and PWMOUT drivers; eliminates need for external bias supply. |
Pinout & Package
LT3761EMSE#PBF 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 performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output / FB overvoltage fault indicator | Drives external 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 (1.25V nominal); enables open-LED detection when combined with ISP/ISN monitoring. |
| ISN (3) | Negative current sense input | Connects to low side of current sense resistor; supports bidirectional bias current for high- or low-side sensing configurations. |
| ISP (4) | Positive current sense input | Connects to high side of current sense resistor; monitors ISP–ISN differential up to 600mV for overcurrent protection. |
| VC (5) | Error amplifier output | Integrates error signal for current/voltage loops; requires RC network to ground for loop stability and transient response. |
| CTRL (6) | Analog dimming / current threshold adjust | Linearly scales current sense threshold from 21mV to 258mV (0–1.0V input); enables precise analog dimming or temperature compensation. |
| VREF (7) | 2.02V reference output | Provides stable bias for CTRL divider or temperature-sensing circuits; capable of sourcing 185µA (typical). |
| PWM (8) | Digital dimming input / self-oscillator enable | Accepts external PWM signal or, with capacitor to GND, generates internal dimming waveform (215–435Hz) controlled by DIM/SS current. |
| OPENLED (9) | Open-circuit fault indicator (LT3761 only) | Open-drain output pulled low when FB < VFB – 50mV AND ISP–ISN < 25mV; requires external pull-up to INTVCC. |
| DIM/SS (10) | Soft-start / PWM dimming programming | Charging current (12µA typ.) sets PWMOUT frequency and duty ratio; also controls soft-start ramp and VC clamp during startup. |
| RT (11) | Frequency programming | Resistor to GND sets oscillator frequency (100kHz–1MHz); values range from 8.87kΩ to 95.3kΩ per datasheet curve. |
| EN/UVLO (12) | Enable / undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.3µA pull-down enables precise UVLO hysteresis setting with external resistor. |
| INTVCC (13) | Internal LDO output | 7.85V regulated supply powering gate drivers and logic; must be bypassed with ≥1µF ceramic capacitor near pin and exposed pad. |
| VIN (14) | Main power input | Supplies INTVCC LDO and internal circuitry; requires local 0.22µF+ low-ESR ceramic bypass capacitor. |
| SENSE (15) | Switch current sense input | Kelvin-connected to source of external N-FET; senses switch current for current-mode control and 105mV overcurrent protection. |
| GATE (16) | N-channel MOSFET driver output | Drives external power FET gate between INTVCC and GND; 25ns rise/fall into 3300pF ensures fast switching and reduced conduction loss. |
| GND (17) | Power and signal ground / exposed pad | Primary ground return; also serves as Kelvin connection point for SENSE resistor negative terminal; must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 external dimming ratio preserves LED chromaticity and avoids color shift seen in analog dimming. |
| High-side or low-side current sensing | 0V to 80V common-mode range enables flexible layout-grounded-anode LEDs or high-voltage strings without level-shifting. |
| Integrated C/10 charge termination | Monitors ISP–ISN voltage to detect battery full-charge condition at 1/10th of constant-current rate, simplifying charger design. |
| Output short-circuit protected boost | Automatic shutdown on ISP–ISN > 600mV prevents damage to FET and inductor during output shorts. |
| Thermally enhanced MSOP | 16-lead MSOP with exposed GND pad achieves θJA = 43°C/W, enabling 60W LED drive in compact space-constrained applications. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay LED Lighting |
|---|---|
Use Scenario: Driving 60W white LED arrays in 12V/24V vehicle electrical systems with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Constant-current controller in boost configuration, managing LED current regulation, PWM dimming synchronization, and open-LED fault reporting. Use Value: 94% efficiency at 350kHz enables passive cooling; 25:1 internal PWM dimming meets automotive ADB requirements without external MCU. | Use Scenario: Powering multi-string 100–200W LED fixtures in warehouse lighting with 0–10V analog dimming interface. IC Role / Device Role / Timing Role: Dual-loop CC/CV controller supporting both constant-current LED drive and constant-voltage auxiliary power rail generation. Use Value: CTRL pin enables seamless 0–10V analog dimming integration; FB loop provides stable 12V auxiliary supply for sensors and controllers. |
| Battery & Supercapacitor Charger | UV-C LED Disinfection System |
Use Scenario: Charging 12V lead-acid or LiFePO₄ batteries and 2.7V/5.5V supercapacitors from variable 12–48V sources. IC Role / Device Role / Timing Role: Accurate current-limited voltage regulator using FB for CV stage and ISP/ISN for CC stage, with C/10 termination. Use Value: ±2% CV regulation and ±3% CC accuracy ensure safe, repeatable charging; OPENLED pin repurposed as charge-complete flag. | Use Scenario: Driving pulsed high-power 275nm UV-C LEDs requiring precise current control and thermal derating. IC Role / Device Role / Timing Role: High-side current-sense controller in buck-boost topology, enabling grounded-cathode UV LED configuration with fast transient response. Use Value: Rail-to-rail 0–80V ISN/ISP sensing allows direct cathode grounding; 3000:1 PWM dimming enables precise dose control without spectral shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3761EMSE-1#PBF | Replaces OPENLED pin with SYNC pin for external clock synchronization; identical electrical specs otherwise. | Required where system-level clock domain alignment is needed (e.g., multi-channel synchronized LED drivers). | Select LT3761EMSE-1#PBF only if frequency synchronization is mandatory; otherwise, LT3761EMSE#PBF provides open-LED fault reporting. |
| LT3965EFE#PBF | 4-channel independent LED controller with I²C interface; lower max VIN (55V); no internal PWM generator. | Used in digitally addressable LED systems requiring channel-by-channel dimming and diagnostics via I²C. | Choose LT3965EFE#PBF for multi-zone control and digital bus integration; LT3761EMSE#PBF suits single-channel analog/PWM systems needing higher VIN and integrated dimming. |
Compared with LT3761EMSE-1#PBF, the LT3761EMSE#PBF offers dedicated open-LED fault signaling instead of clock sync-critical for safety-critical lighting-while both share identical regulation accuracy, sensing range, and thermal performance in the same MSOP package.
Availability
LT3761EMSE#PBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-bay lighting, battery charging circuits, and UV-C disinfection equipment requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term production continuity.
Supply support for LT3761EMSE#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 semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs, formed through the acquisition of Linear Technology in 2017.
The LT3761EMSE#PBF belongs to ADI's high-voltage LED controller product line, designed specifically for robust, efficient, and feature-rich constant-current LED driving in demanding environments including automotive, industrial, and medical applications.
FAQ
What is the maximum input voltage rating for the LT3761EMSE#PBF?
The LT3761EMSE#PBF has an absolute maximum VIN rating of 60V, with guaranteed operation from 4.5V to 60V. This wide input range supports direct connection to 12V, 24V, and 48V industrial and automotive power buses without pre-regulation, making it ideal for LED drivers in variable-supply environments.
Does the LT3761EMSE#PBF support both high-side and low-side current sensing?
Yes, the LT3761EMSE#PBF supports both configurations: ISP and ISN pins accept rail-to-rail common-mode voltages from 0V to 80V, enabling high-side sensing for grounded-anode LED strings or low-side sensing for simplified PCB layout. The input bias current varies with CTRL voltage and sensing polarity, ensuring accuracy across both modes.
How does the OPENLED pin function on the LT3761EMSE#PBF?
The OPENLED pin on the LT3761EMSE#PBF is an open-drain output that pulls low when two conditions are met simultaneously: FB voltage falls below VFB – 50mV (≈1.205V) AND the ISP–ISN differential drops below 25mV (typical). This indicates an open LED string and requires an external pull-up resistor to INTVCC for proper operation.
Can the LT3761EMSE#PBF be used for battery charging applications?
Yes, the LT3761EMSE#PBF is explicitly designed for battery and supercapacitor charging. Its dual-loop architecture regulates constant current via ISP/ISN and constant voltage via FB, while the C/10 inhibit threshold (14–39mV) enables accurate full-charge detection. The ±3% current and ±2% voltage regulation tolerances meet stringent charging requirements.
What package type and thermal characteristics does the LT3761EMSE#PBF use?
The LT3761EMSE#PBF uses a 16-lead plastic MSOP package with exposed GND pad (Pin 17), which must be soldered to the PCB ground plane. It features θJA = 43°C/W and θJC = 4°C/W, enabling reliable operation at junction temperatures up to 125°C-validated for continuous 60W LED drive in thermally constrained enclosures.
LT3761EMSE#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#PBF FAQ
1.How can I place an order for LT3761EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761EMSE#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#PBF reliable?
The price and inventory of LT3761EMSE#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#PBF is usually 5 days.
3.What payment methods are accepted for LT3761EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761EMSE#PBF?
LT3761EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761EMSE#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#PBF?
For technical support, including LT3761EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761EMSE#PBF requirements.
6.How does Aetrix verify that LT3761EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3761EMSE#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#PBF meets industry standards.
7.What is the process for return or replacement of LT3761EMSE#PBF?
All LT3761EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761EMSE#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#PBF part is unused and in its original packaging.
Return procedure for LT3761EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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