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Analog Devices Inc. LT3761AIMSE#TRPBF
- Part No.:
- LT3761AIMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761AIMSE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,010
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Product details
Overview
LT3761AIMSE#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, and flyback topologies. It delivers ±3% constant-current regulation and ±2% constant-voltage regulation, supports 3000:1 True Color PWM™ dimming via external signal, integrates a programmable internal PWM generator (4%–96% duty, 215–400Hz), and features rail-to-rail high-side or low-side current sensing up to 80V. It is deployed in automotive headlamps requiring precise thermal-stable brightness control.
For engineers reviewing the LT3761AIMSE#TRPBF datasheet, LT3761AIMSE#TRPBF pinout, LT3761AIMSE#TRPBF application, or LT3761AIMSE#TRPBF equivalent, key selection criteria include its 100kHz–1MHz adjustable switching frequency, 16-lead MSOP package with exposed thermal pad, integrated open-LED and output short-circuit protection, C/10 battery charge indication, and compatibility with grounded-anode LED configurations.
Technical Context
The LT3761AIMSE#TRPBF implements a fixed-frequency, current-mode control architecture with dual-loop capability: a current-sense loop (via ISP/ISN inputs) for constant-current regulation and a voltage-feedback loop (via FB pin) for constant-voltage operation or LED open-circuit detection. Its transconductance error amplifier (VC pin) interfaces with an RC compensation network to stabilize both loops across wide VIN and VOUT ranges.
It integrates independent logic for fault management-including ISP–ISN overcurrent detection (>600mV threshold), FB overvoltage shutdown (>VFB + 60mV), and OPENLED latching-while supporting analog dimming via CTRL pin (0–1.0V linear adjustment of current sense threshold) and self-oscillating PWM dimming via DIM/SS-programmed PWMOUT (duty ratio set by external capacitor and DIM/SS current).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports direct connection to automotive battery (12V/24V/48V systems) without pre-regulation |
| Current Sense Range | 0V to 80V rail-to-rail - enables high-side sensing in >100V LED strings with ground-referred current measurement |
| Constant Current Accuracy | ±3% - ensures stable LED luminance across temperature and line variations in lighting and charging applications |
| Switching Frequency Range | 100kHz to 1MHz - selectable via RT resistor to balance efficiency, EMI, and external component size |
| PWM Dimming Ratio | Up to 3000:1 - preserves color fidelity during deep dimming in automotive and architectural lighting |
| Thermal Package | 16-Lead MSOP with exposed GND pad - θJC = 4°C/W enables high-power operation up to 125°C junction temperature |
| Shutdown Current | <1µA - meets ultra-low quiescent power requirements for always-on vehicle systems |
Pinout & Package
LT3761AIMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with an exposed GND pad (Pin 17) that must be soldered to the PCB for thermal and electrical integrity. The package measures 4.0mm × 3.0mm × 0.85mm and supports reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output / Fault indicator | Drives external NMOS disconnect switch; toggles low on 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 ISP–ISN < 25mV and FB < VFB – 50mV |
| 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 | Completes Kelvin connection to current-sense resistor; overcurrent triggers GATE/PWMOUT shutdown if ISP–ISN > 600mV |
| VC (5) | Error amplifier output | High-impedance node during PWM low; stores demand state for next cycle; requires RC compensation to stabilize loop |
| CTRL (6) | Analog dimming / current threshold control | Linearly adjusts ISP–ISN regulation threshold from 21mV to 250mV (0–1.0V input); disables current loop when tied to VREF |
| VREF (7) | 2.02V reference output | Supplies up to 185µA; used to bias CTRL divider for analog dimming or temperature compensation networks |
| PWM (8) | Digital dimming enable / oscillator control | External signal enables 3000:1 PWM dimming; capacitor to GND creates self-oscillating dimmer with duty set by DIM/SS current |
| OPENLED (9) | Open-load status indicator | Open-drain output pulled low when FB drops below VFB – 50mV and ISP–ISN < 25mV; requires external pull-up to INTVCC |
| DIM/SS (10) | Soft-start / PWM generator programming | Charging current sets PWMOUT duty ratio; resets on UVLO, overcurrent, or thermal fault; minimum 560pF to GND required |
| RT (11) | Frequency setting input | Resistor to GND programs switching frequency from 100kHz to 1MHz; values specified in datasheet curves |
| EN/UVLO (12) | Enable / 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 regulated supply for gate drivers; requires 1µF ceramic bypass close to pin and exposed pad |
| 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 NFET; monitors peak switch current; clamped at 105mV typical limit |
| GATE (16) | N-channel MOSFET driver | Drives external power FET between INTVCC and GND; transitions low during shutdown, fault, or idle states |
| GND (17) | Power and signal ground | Exposed thermal pad; serves as return for SENSE, ISN, and internal circuits; must be soldered to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 ratio with no color shift - critical for automotive adaptive front-lighting systems (AFS) and high-end displays |
| Programmable internal PWM generator | 4%–96% duty, 215–400Hz frequency - eliminates need for external oscillator in cost-sensitive LED modules |
| Rail-to-rail current sense inputs | 0V to 80V common-mode range - supports high-side sensing in >100V LED strings while maintaining ground-referenced control |
| Integrated open-LED and short-circuit protection | OPENLED latched reporting + automatic GATE/PWMOUT shutdown - reduces system-level fault response time to <1µs |
| C/10 battery charge indication | Active when ISP–ISN falls below 14–39mV - provides precise end-of-charge signal for Li-ion and supercapacitor chargers |
| Adjustable switching frequency | 100kHz–1MHz via single RT resistor - allows optimization for EMI compliance, efficiency, or compact magnetics in space-constrained designs |
Applications
| Automotive Headlamp Driver | Battery & Supercapacitor Charger |
|---|---|
|
Use Scenario: High-brightness LED headlamp module in 12V/24V vehicle platforms requiring adaptive beam shaping and thermal derating. IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current; uses CTRL pin for analog dimming and PWMOUT for dynamic load disconnect during fault events. Use Value: Delivers 94% efficiency at 350kHz, supports 25:1 internal PWM dimming, and provides open-LED reporting to vehicle CAN bus via OPENLED pin. |
Use Scenario: Single-chip charger for 3S Li-ion packs or 12V supercapacitor banks in industrial backup power systems. IC Role / Device Role / Timing Role: Constant-current/constant-voltage regulator with C/10 termination detection; FB pin configures CV threshold, ISP/ISN senses charge current. Use Value: Achieves ±3% CC accuracy and ±2% CV accuracy over –40°C to 125°C; OPENLED pin repurposed as charge-complete flag. |
| Ground-Anode LED Lighting | Industrial Constant-Current Supply |
|
Use Scenario: Architectural LED strip lighting where LEDs are mounted on grounded metal heatsinks for EMC and safety compliance. IC Role / Device Role / Timing Role: Boost-mode controller with high-side current sensing (ISP/ISN) and grounded-anode topology; uses SENSE pin for switch current monitoring. Use Value: Eliminates floating sense resistors; enables direct thermal coupling of LEDs to chassis ground while maintaining accurate current regulation. |
Use Scenario: Precision current-limited lab supply or sensor excitation source requiring stable output under varying load impedance. IC Role / Device Role / Timing Role: Accurate current-limited voltage regulator; FB pin sets output voltage, ISP/ISN enforces current limit, CTRL enables remote current scaling. Use Value: Provides ±3% current limit accuracy and fast overload recovery (<10µs) via dedicated ISP–ISN overcurrent comparator. |
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-power multi-string LED arrays; lacks open-LED reporting and C/10 indication | Select when >100W output and phase interleaving are required; not drop-in for LT3761AIMSE#TRPBF's single-switch topologies |
| LM3410XSDX/NOPB | Fixed-frequency 1.6MHz boost controller; no high-side current sensing; max VIN = 42V; no analog dimming | Cost-optimized portable LED flash; lacks 3000:1 dimming, thermal grade, or automotive qualification | Choose for consumer lighting with <42V input and minimal feature set; unsuitable for 60V automotive or precision dimming |
Compared with LTC3789EMSE#TRPBF and LM3410XSDX/NOPB, the LT3761AIMSE#TRPBF uniquely combines 60V input tolerance, rail-to-rail high-side sensing, integrated True Color PWM™, and automotive-grade temperature range in a single 16-pin MSOP - making it optimal for space-constrained, thermally demanding LED and charging applications where reliability and feature integration are prioritized over raw power density.
Availability
LT3761AIMSE#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, battery charging, and industrial constant-current supply applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned manufacturing traceability.
Supply support for LT3761AIMSE#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 technologies, formed through the acquisition of Linear Technology in 2017.
The LT3761A product line was designed specifically for high-reliability, wide-input-range LED current regulation and battery charging - emphasizing precision current sensing, robust fault protection, and seamless integration into thermally constrained automotive and industrial power systems.
FAQ
What is the operating temperature range for the LT3761AIMSE#TRPBF?
The LT3761AIMSE#TRPBF is rated for operation from –40°C to +125°C ambient temperature. This industrial/automotive-grade specification is confirmed in the manufacturer's order information table and applies across all electrical characteristics unless otherwise noted. The "I" grade designation explicitly denotes this extended temperature range, distinguishing it from the "E" grade (–40°C to 125°C with reduced performance guarantees). Thermal derating begins above 125°C junction temperature.
Does the LT3761AIMSE#TRPBF support high-side current sensing in boost configurations?
Yes, the LT3761AIMSE#TRPBF supports true high-side current sensing via its ISP and ISN pins, with a rail-to-rail common-mode input range of 0V to 80V. This enables direct sensing on the positive side of the LED string in boost topologies - critical for grounded-anode LED installations. The datasheet confirms operation with ISP up to 48V and ISN at 0V, and specifies full-scale threshold accuracy across this range.
How does the internal PWM generator in the LT3761AIMSE#TRPBF differ from the original LT3761?
The LT3761AIMSE#TRPBF offers improved accuracy of internal PWM dimming versus the LT3761, as stated in the device description. Specifically, its PWMOUT duty ratio exhibits tighter tolerance across temperature and supply voltage - with typical values of 3.8%/7.9%/50%/95% at DIM/SS currents of –6.5µA/0µA/20µA/44µA - enabling more consistent dimming performance in automotive environments where thermal stability is essential.
Can the LT3761AIMSE#TRPBF be used for constant-voltage regulation only, without LED current control?
Yes, the LT3761AIMSE#TRPBF can operate exclusively in constant-voltage mode. To disable the current loop, tie ISP and ISN together and connect CTRL to VREF. The FB pin then regulates output voltage to 1.25V ±2%, with protections including FB overvoltage shutdown and OPENLED reporting triggered when load current falls below C/10 threshold - making it suitable for precision CV supplies and battery chargers.
What is the purpose of the exposed pad (Pin 17) on the LT3761AIMSE#TRPBF MSOP package?
The exposed pad (Pin 17) on the LT3761AIMSE#TRPBF is electrically and thermally connected to GND. It must be soldered directly to the PCB ground plane to ensure proper thermal dissipation (θJC = 4°C/W) and low-impedance return path for SENSE, ISN, and internal circuits. Leaving it unconnected degrades thermal performance and may cause instability or premature thermal shutdown during sustained high-current operation.
LT3761AIMSE#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
LT3761AIMSE#TRPBF FAQ
1.How can I place an order for LT3761AIMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761AIMSE#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 LT3761AIMSE#TRPBF reliable?
The price and inventory of LT3761AIMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761AIMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3761AIMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761AIMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761AIMSE#TRPBF?
LT3761AIMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761AIMSE#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 LT3761AIMSE#TRPBF?
For technical support, including LT3761AIMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761AIMSE#TRPBF requirements.
6.How does Aetrix verify that LT3761AIMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3761AIMSE#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 LT3761AIMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3761AIMSE#TRPBF?
All LT3761AIMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761AIMSE#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 LT3761AIMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3761AIMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3761AIMSE#TRPBF Tags
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