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Analog Devices Inc. LT3761IMSE-1#TRPBF
- Part No.:
- LT3761IMSE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761IMSE-1#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,445
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Product details
Overview
LT3761IMSE-1#TRPBF from Analog Devices is a 4.5V to 60V input, constant-current/constant-voltage DC/DC controller optimized for high-current LED driving in boost, SEPIC, and buck-boost 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 100kHz–1MHz adjustable switching frequency. It is used in automotive headlamp systems requiring 25:1 internal PWM dimming and robust open-LED protection.
For engineers reviewing the LT3761IMSE-1#TRPBF datasheet, LT3761IMSE-1#TRPBF pinout, LT3761IMSE-1#TRPBF application, or LT3761IMSE-1#TRPBF equivalent, key selection criteria include its SYNC-capable oscillator (LT3761-1 variant), rail-to-rail ISP/ISN sensing (0V–80V), C/10 battery charge indication, and thermally enhanced 16-lead MSOP package rated for –40°C to 125°C operation.
Technical Context
The LT3761IMSE-1#TRPBF implements a fixed-frequency, current-mode control architecture with dual feedback loops: one for constant-current regulation via ISP/ISN differential sensing (full-scale threshold 250mV, ±3% accuracy), and another for constant-voltage regulation via FB pin (1.25V reference, ±2% accuracy). Its VC error amplifier output interfaces with external RC compensation to stabilize loop response across wide VIN and VOUT ranges.
It features a dedicated SYNC pin (Pin 9) enabling external clock synchronization - a distinguishing trait of the LT3761-1 family - with 30kΩ internal pull-down, 1.5V logic-high threshold, and 0.4V logic-low threshold. Unlike the LT3761 (which uses Pin 9 as OPENLED), the LT3761IMSE-1#TRPBF repurposes this pin exclusively for synchronization, eliminating open-LED status reporting 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. |
| ISP/ISN Common-Mode Range | 0V to 80V - enables high-side current sensing on grounded-anode LED strings >100V. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor; allows optimization of efficiency, EMI, and inductor size. |
| Current Regulation Accuracy | ±3% - ensures stable LED brightness across temperature and line/load variations. |
| Constant-Voltage Regulation | ±2% at FB pin (1.25V nominal) - supports battery charging and regulated voltage supply applications. |
| SYNC Input Compatibility | Logic-level sync with 50% duty cycle; internal 30kΩ pull-down - eliminates need for external biasing when unused. |
| Thermal Rating | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
LT3761IMSE-1#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17 = GND), requiring soldering to PCB ground plane for thermal and electrical integrity. The package measures 4mm × 3mm × 0.85mm (max height) and supports reflow per JEDEC J-STD-020.
| 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 - protects LEDs during CV mode overvoltage. |
| 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 | 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 - forces GATE/PWMOUT low for protection. |
| VC (5) | Error amplifier output | High-impedance during PWM low; stores demand state on external RC network for fast transient recovery. |
| CTRL (6) | Current sense threshold adjust | Linearly scales VISP–ISN threshold from 25mV (at 0.2V) to 250mV (≥1.2V); enables analog dimming and temperature compensation. |
| VREF (7) | 2.02V precision reference output | Supplies up to 185µA; used to bias CTRL divider or drive external tempco circuits - improves dimming linearity. |
| PWM (8) | Digital dimming input / self-oscillator enable | Accepts external PWM signal (3000:1 dimming) or drives internal oscillator via CPWM - duty set by DIM/SS current. |
| SYNC (9) | External clock synchronization input | Replaces OPENLED function in LT3761-1; synchronizes internal oscillator - critical for multi-phase or noise-sensitive systems. |
| DIM/SS (10) | Soft-start & PWM generator programming | 12µA internal pull-up sets PWMOUT frequency/duty; capacitor here defines soft-start time and dimming waveform stability. |
| RT (11) | Frequency adjustment | Resistor to GND programs switching frequency (100kHz–1MHz); values 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 external hysteresis resistor design. |
| INTVCC (13) | Internally regulated supply | 7.85V LDO (36mA limit) powers gate drivers and internal logic - bypass with 1µF ceramic close to pin. |
| 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 N-FET; senses peak switch current for current-mode control and 105mV overcurrent clamp. |
| GATE (16) | N-channel FET driver output | Drives external power MOSFET gate between INTVCC and GND; 25ns rise/fall times support high-frequency operation. |
| GND (17) | Power & signal ground / exposed pad | Must be soldered to PCB ground plane - provides primary thermal path and low-impedance return for SENSE and ISN. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ Dimming | 3000:1 dimming ratio with no color shift - achieved via synchronous external PWM signal, not just analog control. |
| Programmable Internal PWM Generator | Duty ratio adjustable from 4% to 96% via DIM/SS current; frequency set by CPWM (e.g., 47nF → ~300Hz) - eliminates need for external oscillator. |
| High-Voltage Current Sensing | Rail-to-rail ISP/ISN input (0V–80V) - enables grounded-anode LED strings and high-side sensing in >100V boost configurations. |
| C/10 Charge Termination Indicator | Asserts when ISP–ISN drops below 25mV (typical) during battery charging - provides precise end-of-charge signal for Li-ion or lead-acid systems. |
| Output Short-Circuit Protected Boost | Automatic shutdown on ISP–ISN >600mV - pulls DIM/SS low and forces GATE/PWMOUT low for ≥4µs to protect external FET and inductor. |
Applications
| Automotive Headlamp Driver | Battery Charger with C/10 Termination |
|---|---|
Use Scenario: High-brightness LED headlamps in passenger vehicles requiring adaptive beam shaping and flicker-free dimming. IC Role / Device Role / Timing Role: Constant-current controller regulating up to 5A LED string current in boost topology; uses SYNC pin to align switching with vehicle ECU clock for EMI reduction. Use Value: Enables 25:1 internal PWM dimming and 94% peak efficiency - meets UNECE R149 photometric stability requirements. | Use Scenario: On-board 12V/24V battery charger for lead-acid or LiFePO₄ backup systems in telecom or industrial UPS. IC Role / Device Role / Timing Role: Constant-current/constant-voltage regulator with C/10 termination detection via ISP/ISN differential voltage monitoring. Use Value: Eliminates need for separate fuel-gauge IC; accurate 25mV C/10 threshold ensures full charge without overcharge stress. |
| Industrial High-Voltage LED Lighting | Grounded-Anode LED String Supply |
Use Scenario: Streetlight or tunnel lighting using 48–72V LED strings powered from PoE++ or DC microgrids. IC Role / Device Role / Timing Role: Boost-mode controller with high-side current sensing (ISP/ISN) and open-LED protection - operates with 60VIN and 80V ISP common-mode. Use Value: Supports >100V LED strings while maintaining single-ended ground-referenced control - simplifies thermal layout and safety isolation. | Use Scenario: Architectural LED signage where LEDs are mounted on grounded metal frames, requiring anode-grounded configuration. IC Role / Device Role / Timing Role: SEPIC or buck-boost controller using low-side current sensing (ISN = GND) and FB-based voltage clamping to prevent overvoltage. Use Value: Enables safe, efficient operation with grounded anodes - avoids floating heatsinks and reduces ESD risk in field installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EMSE#TRPBF | No integrated PWM generator; requires external dimming signal; lacks SYNC pin; 40V max VIN. | Best for fixed-frequency, externally dimmed LED drivers where internal oscillator is unnecessary. | Select when system already provides clean PWM signal and VIN ≤40V; avoid for 60VIN or self-oscillating dimming needs. |
| LT3756IMSE-1#TRPBF | Same 60VIN, SYNC, and ISP/ISN architecture; but higher 100V ISP/ISN common-mode range and no C/10 indication. | Preferred for ultra-high-voltage LED strings (>100V) or when C/10 functionality is not required. | Choose for >100V LED stacks or where extended sensing range outweighs battery charge feature. |
Compared with LTC3783EMSE#TRPBF, LT3761IMSE-1#TRPBF adds internal PWM generation and 60VIN operation - critical for automotive and industrial LED drivers. Versus LT3756IMSE-1#TRPBF, it trades 100V ISP/ISN range for integrated C/10 battery termination - making it superior for dual-purpose LED/battery systems.
Availability
LT3761IMSE-1#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 AEC-Q100-aligned reliability.
Supply support for LT3761IMSE-1#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 (including former Linear Technology) designs high-performance analog, mixed-signal, and power management ICs for precision, reliability, and rugged operation in demanding environments.
The LT3761/LT3761-1 product line was engineered specifically for high-current LED driving and multi-mode DC/DC regulation - emphasizing wide input range, robust protection, and flexible dimming in automotive and industrial lighting.
FAQ
What is the key functional difference between LT3761IMSE-1#TRPBF and LT3761IMSE#TRPBF?
The LT3761IMSE-1#TRPBF includes a dedicated SYNC pin (Pin 9) for external clock synchronization, replacing the OPENLED status pin found on the LT3761IMSE#TRPBF. This enables deterministic timing alignment in multi-converter systems but removes open-LED fault reporting capability. Both share identical thermal rating (–40°C to 125°C), package, and core regulation architecture.
Can LT3761IMSE-1#TRPBF drive LED strings with anode grounded to chassis?
Yes. LT3761IMSE-1#TRPBF supports grounded-anode configurations using low-side current sensing (connect ISN to GND, ISP to sense resistor high side) and FB-based voltage regulation. Its rail-to-rail ISP/ISN input (0V–80V) and ability to regulate in buck-boost or SEPIC topologies make it ideal for chassis-grounded LED installations without floating references.
What is the minimum external capacitor required on the DIM/SS pin for stable internal PWM generation?
The DIM/SS pin requires a minimum 560pF capacitor to GND when used with the internal PWM generator function. This capacitor sets the dimming frequency in conjunction with internal pull-up/pull-down currents; typical values (e.g., 47nF) yield ~300Hz output. Smaller capacitors increase frequency but reduce duty resolution and stability - 560pF is the absolute lower bound per datasheet guidance.
How does the C/10 battery charge termination work on LT3761IMSE-1#TRPBF?
The C/10 termination is triggered when the ISP–ISN differential voltage falls below 25mV (typical), indicating battery current has dropped to 1/10th of its initial charge rate. This threshold is monitored continuously during constant-voltage phase; assertion pulls DIM/SS low and can be used to disable charging or signal full charge. No external comparator is needed - the function is fully integrated.
Is LT3761IMSE-1#TRPBF compatible with 5V logic-level PWM input signals?
Yes. The PWM pin accepts standard 5V CMOS/TTL logic levels: it recognizes a high threshold of 0.83V (typical) and low threshold of 0.78V (typical) with 0.4V hysteresis. A 5V signal easily exceeds these thresholds and provides sufficient noise margin. The pin sources/sinks up to 200µA, compatible with most microcontroller GPIO outputs without buffering.
LT3761IMSE-1#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-1#TRPBF FAQ
1.How can I place an order for LT3761IMSE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761IMSE-1#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-1#TRPBF reliable?
The price and inventory of LT3761IMSE-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3761IMSE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761IMSE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761IMSE-1#TRPBF?
LT3761IMSE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761IMSE-1#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-1#TRPBF?
For technical support, including LT3761IMSE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761IMSE-1#TRPBF requirements.
6.How does Aetrix verify that LT3761IMSE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3761IMSE-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3761IMSE-1#TRPBF?
All LT3761IMSE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761IMSE-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3761IMSE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3761IMSE-1#TRPBF Tags
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