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Analog Devices Inc. LT3761IMSE#TRPBF
- Part No.:
- LT3761IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761IMSE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:717
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Product details
Overview
LT3761IMSE#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, supports 3000:1 True Color PWM™ dimming, and integrates a programmable internal PWM generator with 4%–96% duty ratio control. It is widely deployed in automotive headlamp systems requiring robust open-LED protection and high-side current sensing up to 80V.
For engineers reviewing the LT3761IMSE#TRPBF datasheet, LT3761IMSE#TRPBF pinout, LT3761IMSE#TRPBF application, or LT3761IMSE#TRPBF equivalent, key selection considerations include its rail-to-rail 0V–80V current sense range, 100kHz–1MHz adjustable switching frequency, integrated analog dimming via CTRL pin, open-LED fault reporting on OPENLED pin, and thermally enhanced 16-lead MSOP package with exposed GND pad.
Technical Context
The LT3761IMSE#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 manages constant-current (via ISP/ISN differential sensing) and constant-voltage (via FB feedback) regulation, with automatic loop dominance management.
It features a programmable internal PWM generator (47nF capacitor sets frequency; DIM/SS current sets duty ratio), 1.25V FB reference with ±50mV overvoltage protection, and VC error amplifier output supporting external RC compensation. The device includes dedicated protection logic for open-LED detection (FB < VFB – 50mV & VISP-ISN < 25mV), ISP/ISN overcurrent (>600mV), and thermal shutdown (>165°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V - supports direct connection to automotive battery (cold-crank tolerant) and industrial 48V rails without pre-regulation. |
| Current Sense Range | 0V to 80V rail-to-rail - enables high-side sensing of grounded-anode LED strings >100V without level-shifting circuitry. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor; allows optimization of efficiency vs. EMI vs. magnetics size (e.g., 350kHz typical in 60W headlamp designs). |
| Constant-Current Accuracy | ±3% - guaranteed over temperature and line; achieved via precision 105mV SENSE threshold and low-drift ISP/ISN amplifier (gm = 120µS high-side). |
| PWM Dimming Ratio | 3000:1 True Color PWM™ - enabled by external PWM signal; preserves LED color fidelity at ultra-low duty cycles without flicker. |
| Shutdown Current | <1µA - achieved when EN/UVLO ≤ 0.4V; critical for always-on automotive modules requiring low quiescent power. |
| Package | 16-Lead Plastic MSOP with exposed thermal pad - θJA = 43°C/W; requires soldered GND pad for thermal reliability in 60W+ LED drivers. |
Pinout & Package
LT3761IMSE#TRPBF 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. The package measures 4.0mm × 3.0mm × 0.85mm (max height) and supports −40°C to +125°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output / FB overvoltage fault indicator | Drives external NMOS disconnect FET; toggles low if FB exceeds VFB + 60mV - provides active overvoltage protection for LED string. |
| FB (2) | Voltage feedback input | Sets constant-voltage regulation point at 1.25V; enables open-LED detection when combined with ISP/ISN < 25mV. |
| ISN (3) | Negative current sense input | Accepts low-side or high-side current sense resistor return; bias current varies with CTRL voltage (e.g., −230µA at low-side sensing). |
| ISP (4) | Positive current sense input | Accepts high-side current sense resistor feed; input common-mode range extends to 80V - supports grounded-anode configurations. |
| VC (5) | Error amplifier output | High-impedance node during PWM low; stores demand state for next cycle; requires external RC network for loop stability. |
| CTRL (6) | Analog dimming / current threshold control | Linearly adjusts VISP-ISN threshold from 21mV to 250mV (0–1V range); enables precise analog dimming and temperature compensation. |
| VREF (7) | 2.02V reference output | Supplies up to 185µA; used to bias CTRL divider or temperature-sensing networks; bypass with ≥10nF for noise immunity. |
| PWM (8) | Digital dimming input / self-oscillator enable | Accepts external PWM signal (200µA drive capability); when capacitor-connected to GND, generates internal dimming waveform (215–435Hz). |
| OPENLED (9) | Open-LED fault indicator (LT3761 only) | Open-drain output pulled low when FB < VFB – 50mV AND VISP-ISN < 25mV - signals LED string breakage to MCU or dashboard. |
| DIM/SS (10) | Soft-start / PWM generator programming | 12µA internal pull-up sets PWMOUT duty ratio; external capacitor defines soft-start time and resets on UVLO/fault. |
| RT (11) | Frequency adjustment | Resistor to GND programs switching frequency (e.g., 95.3kΩ → 100kHz; 8.87kΩ → 1MHz); critical for EMI compliance. |
| EN/UVLO (12) | Enable / input undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.3µA pull-down enables precise external hysteresis resistor selection. |
| INTVCC (13) | Internal LDO output (7.85V) | Supplies GATE/PWMOUT drivers and internal logic; requires 1µF ceramic cap close to pin; dropout = 390mV @ −10mA. |
| VIN (14) | Main power input | Bypass with ≥0.22µF low-ESR ceramic cap; powers INTVCC LDO and internal circuits; absolute max = 60V. |
| SENSE (15) | Switch current sense input | Kelvin-connected to source of external NFET; monitors peak switch current; clamped at 105mV to prevent overcurrent damage. |
| GATE (16) | N-channel MOSFET gate driver | Drives external power FET between INTVCC and GND; rise/fall time ≤25ns @ 3300pF; VOH = INTVCC – 0.05V. |
| GND (17) | Power & signal ground / thermal pad | Exposed pad serves as primary current sense return and thermal path; must be soldered to large PCB copper area. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 ratio preserves LED chromaticity at low brightness - eliminates color shift in automotive adaptive front-lighting systems (AFS). |
| Rail-to-rail 0V–80V current sense | Enables high-side sensing of grounded-anode LED strings >100V without isolated amplifiers - reduces BOM cost and layout complexity. |
| Integrated C/10 battery charge indication | Uses ISP/ISN differential voltage threshold (14–39mV) to signal end-of-charge in supercapacitor or Li-ion charging applications. |
| Output short-circuit protected boost | Automatic hiccup mode triggered by ISP–ISN > 600mV - limits average power during sustained short, preventing MOSFET thermal runaway. |
| Programmable internal PWM generator | Duty ratio (4%–96%) and frequency (215–435Hz) set by single external capacitor and DIM/SS current - eliminates need for external timer IC. |
| Open-LED status reporting | Dedicated OPENLED pin asserts low fault signal when FB drops below VFB – 50mV AND VISP-ISN < 25mV - enables fail-safe system diagnostics. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Adaptive driving beam (ADB) systems requiring precise, flicker-free dimming of multi-segment LED arrays under 12V/24V battery supply. IC Role / Device Role / Timing Role: Constant-current controller managing boost topology with high-side current sensing and synchronized PWM dimming across segments. Use Value: 3000:1 True Color PWM™ ensures consistent white point across 0.03%–100% brightness; 60V VIN rating handles load-dump transients per ISO 7637-2. |
Use Scenario: 100–200W LED fixtures for warehouse lighting, powered from 48V DC microgrids with strict thermal constraints. IC Role / Device Role / Timing Role: SEPIC-mode controller delivering regulated current to long LED strings while maintaining isolation between input and output grounds. Use Value: Rail-to-rail 0V–80V ISP/ISN sensing enables grounded-anode configuration - simplifies thermal management and improves EMI performance. |
| Battery & Supercapacitor Charging | Medical Surgical Lighting |
|
Use Scenario: Constant-current/constant-voltage charging of 24V LiFePO₄ batteries or 36V supercapacitor banks in portable equipment. IC Role / Device Role / Timing Role: Dual-loop regulator using FB for voltage termination and ISP/ISN for current limiting; C/10 threshold triggers charge-complete signal. Use Value: ±3% current accuracy ensures precise capacity delivery; open-LED detection repurposed as "battery disconnected" fault indicator. |
Use Scenario: Shadowless LED operating lights demanding zero-flicker, color-stable illumination at variable intensity levels in OR environments. IC Role / Device Role / Timing Role: Boost controller with analog dimming (CTRL pin) and digital PWM dimming (PWM pin) for seamless brightness transitions. Use Value: Simultaneous analog + PWM dimming eliminates audible noise from inductor saturation; ±2% voltage regulation maintains consistent LED forward voltage. |
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 | Wide VIN (4–60V), synchronous 4-switch buck-boost controller; no integrated PWM generator; requires external dimming interface. | Supports bidirectional power flow and higher efficiency (>95%) in battery-powered portable lighting; lacks OPENLED fault pin. | Choose LTC3789EMSE#TRPBF when bidirectional operation or highest efficiency is required, and external PWM generation is acceptable. |
| MAX20050ATPA/VY+ | Automotive-grade 4.5–65V LED controller with integrated high-side switch; fixed 2.2MHz frequency; no analog dimming (CTRL) support. | Designed specifically for AEC-Q100 Grade 1 automotive headlamps; includes ASIL-B ready diagnostics but no C/10 charging feature. | Choose MAX20050ATPA/VY+ for new automotive designs requiring full AEC-Q100 qualification and integrated switch, where analog dimming is not needed. |
Compared with LTC3789EMSE#TRPBF and MAX20050ATPA/VY+, the LT3761IMSE#TRPBF uniquely combines internal PWM generation, analog dimming via CTRL, open-LED reporting, and C/10 charging indication in a single 16-pin MSOP - making it optimal for cost-sensitive, function-rich LED driver and charger designs where external timing components must be minimized.
Availability
LT3761IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, industrial high-bay fixtures, medical surgical lamps, and battery charging systems requiring stable component supply, extended temperature operation (−40°C to +125°C), and long-term production continuity.
Supply support for LT3761IMSE#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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3761IMSE#TRPBF belongs to ADI's Power by Linear™ portfolio of high-reliability DC/DC controllers, designed specifically for demanding LED lighting, automotive, and industrial power applications requiring precision current regulation and robust fault protection.
FAQ
What is the maximum input voltage rating for the LT3761IMSE#TRPBF?
The LT3761IMSE#TRPBF has an absolute maximum VIN rating of 60V, with guaranteed operation from 4.5V to 60V. This makes it suitable for 12V and 24V automotive systems, including those subject to load-dump transients defined in ISO 7637-2. Exceeding 60V may cause permanent damage.
Does the LT3761IMSE#TRPBF support high-side current sensing for grounded-anode LED strings?
Yes, the LT3761IMSE#TRPBF supports true high-side current sensing with a 0V to 80V input common-mode range on ISP and ISN pins. This enables direct sensing of current in grounded-anode LED configurations - eliminating the need for isolated amplifiers or shunt-based low-side sensing that compromises thermal performance.
How does the OPENLED pin on the LT3761IMSE#TRPBF detect an open LED condition?
The OPENLED pin on the LT3761IMSE#TRPBF asserts a low signal when two conditions occur simultaneously: (1) FB voltage falls below VFB – 50mV (≈1.205V), and (2) the ISP–ISN differential voltage drops below 25mV (typical). This dual-condition logic prevents false triggers during transient events and confirms actual LED string breakage.
Can the LT3761IMSE#TRPBF be used for battery charging applications?
Yes, the LT3761IMSE#TRPBF is explicitly designed for battery and supercapacitor charging. Its dual-loop regulation supports constant-current/constant-voltage profiles, and the C/10 inhibit threshold (14–39mV on ISP–ISN) provides a reliable end-of-charge signal - verified in Linear Technology's application note DC2223A for LiFePO₄ charging.
What is the purpose of the DIM/SS pin on the LT3761IMSE#TRPBF?
The DIM/SS pin on the LT3761IMSE#TRPBF serves two functions: (1) soft-start control - an external capacitor sets ramp time and resets on UVLO/fault; and (2) PWM generator programming - its 12µA internal pull-up current sets the duty ratio of the self-oscillating PWMOUT signal when a capacitor is connected to the PWM pin.
LT3761IMSE#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
LT3761IMSE#TRPBF FAQ
1.How can I place an order for LT3761IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761IMSE#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 LT3761IMSE#TRPBF reliable?
The price and inventory of LT3761IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3761IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761IMSE#TRPBF?
LT3761IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761IMSE#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 LT3761IMSE#TRPBF?
For technical support, including LT3761IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3761IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3761IMSE#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 LT3761IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3761IMSE#TRPBF?
All LT3761IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761IMSE#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 LT3761IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3761IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3761IMSE#TRPBF Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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