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Analog Devices Inc. LT3761AIMSE#WTRPBF
- Part No.:
- LT3761AIMSE#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761AIMSE#WTRPBF.pdf
- Description:
- IC LED DRV DC DC CTRL PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,494
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Product details
Overview
LT3761AIMSE#WTRPBF from Analog Devices is a 4.5V–60V input, constant-current/constant-voltage DC/DC controller optimized for high-current LED driving in automotive headlamps and industrial lighting. It delivers ±3% current regulation and ±2% voltage regulation, supports 100kHz–1MHz programmable switching frequency, integrates a self-oscillating PWM dimming generator (4%–96% duty), and features high-side or low-side current sensing up to 80V common-mode range.
For engineers reviewing the LT3761AIMSE#WTRPBF datasheet, LT3761AIMSE#WTRPBF pinout, LT3761AIMSE#WTRPBF application, or LT3761AIMSE#WTRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 3000:1 external PWM dimming ratio, rail-to-rail 0V–80V sense capability, C/10 battery charge indication, and open-LED fault reporting via OPENLED pin.
Technical Context
The LT3761AIMSE#WTRPBF employs a fixed-frequency current-mode architecture with internal slope compensation, enabling stable operation across wide VIN (4.5V–60V) and output voltage ranges. Its dual-loop control supports simultaneous constant-current (via ISP/ISN) and constant-voltage (via FB) regulation, with seamless transition between modes governed by real-time VISP–ISN and FB comparisons.
It integrates a programmable internal PWM generator (215Hz–400Hz, adjustable via DIM/SS current), analog dimming via CTRL pin (0–1V linear scaling of current threshold), and robust protection including open-LED detection (FB < VFB – 50mV + VISP–ISN < 25mV), output short-circuit response, and thermal shutdown at >165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V - supports direct connection to automotive battery (cold-crank down to 4.5V) and industrial 48V rails without pre-regulation. |
| Current Regulation Accuracy | ±3% - ensures consistent LED brightness across temperature and unit variation in high-reliability lighting systems. |
| Voltage Regulation Accuracy | ±2% - enables precise CV mode for battery/supercapacitor charging applications with tight termination voltage control. |
| Switching Frequency Range | 100kHz to 1MHz - allows optimization of magnetics size (higher f = smaller inductor) versus efficiency (lower f = lower switching loss). |
| Current Sense Common-Mode Range | 0V to 80V - permits high-side sensing of grounded-anode LED strings >100V while maintaining ground-referenced control logic. |
| PWM Dimming Ratio (External) | Up to 3000:1 - delivers true-color LED dimming without color shift in automotive adaptive driving beam (ADB) systems. |
| Shutdown Current | <1µA - meets automotive static current requirements for always-on modules during vehicle sleep mode. |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade I, suitable for under-hood and headlamp module placement. |
Pinout & Package
LT3761AIMSE#WTRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17) soldered to PCB ground for optimal thermal dissipation (θJC = 4°C/W). The package supports automotive-grade reliability and high-power density layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output / Fault indicator | Drives external NMOS disconnect switch; toggles low during FB overvoltage (>VFB + 60mV) to isolate LED load and prevent overcurrent damage. |
| FB (2) | Voltage feedback input | Sets constant-voltage regulation point at 1.25V; enables open-LED detection when VFB drops below threshold while VISP–ISN < 25mV. |
| ISN (3) | Negative current sense input | Completes Kelvin-connected current sense path; bias current varies with CTRL voltage and ISP/ISN differential. |
| ISP (4) | Positive current sense input | Accepts high-side or low-side sense resistor; triggers overcurrent shutdown if VISP–ISN > 600mV (typical). |
| VC (5) | Error amplifier output | Integrates loop error signal; high-impedance during PWM low to retain state for next cycle-critical for stable current regulation. |
| CTRL (6) | Analog dimming / current threshold control | Linearly scales current sense threshold from 21mV to 258mV (0–1V input), enabling precise analog dimming or temperature-compensated current limiting. |
| VREF (7) | 2.02V reference output | Supplies up to 185µA; used to bias CTRL divider for analog dimming or LED thermal foldback circuits. |
| PWM (8) | Digital dimming / oscillator enable | Accepts external PWM signal or self-oscillates with capacitor; internal pull-up/pull-down currents set duty ratio based on DIM/SS current. |
| OPENLED (9) | Open-load status flag | Open-drain output pulled low when FB < VFB – 50mV AND VISP–ISN < 25mV-signals transition from CC to CV mode or LED string failure. |
| DIM/SS (10) | Soft-start / PWM generator programming | Charging current sets PWMOUT frequency and duty; resets on UVLO, overcurrent, or thermal fault-ensures controlled startup and fault recovery. |
| RT (11) | Frequency adjustment | Resistor-to-GND sets switching frequency (100kHz–1MHz); values specified in datasheet curves for accurate timing calibration. |
| EN/UVLO (12) | Enable / undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.3µA internal pull-down enables precise external hysteresis resistor selection. |
| INTVCC (13) | Internal LDO output | 7.85V regulated supply powers GATE/PWMOUT drivers; requires 1µF ceramic bypass close to pin and exposed pad. |
| VIN (14) | Main power input | Supplies INTVCC LDO and internal circuitry; must be bypassed with ≥0.22µF low-ESR ceramic capacitor near pin. |
| SENSE (15) | Switch current sense input | Kelvin-connected to source of external NFET; monitors peak switch current to enforce 105mV (typ) current limit. |
| GATE (16) | NFET gate driver | Drives external power MOSFET between INTVCC and GND; transitions low during shutdown/fault/idle to disable power stage. |
| GND (17) | Power & signal ground | Exposed thermal pad-must be soldered to PCB ground plane; serves as return for SENSE, ISN, and internal circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PWM dimming generator | Self-oscillating function eliminates need for external clock IC-reduces BOM count and PCB area in space-constrained headlamp modules. |
| AEC-Q100 Grade I qualification | Validated for automotive under-hood use (-40°C to +125°C ambient), including HTOL, TC, and ESD testing-enables drop-in deployment in OEM lighting systems. |
| Rail-to-rail 0V–80V current sense | Supports both high-side sensing (grounded anode LEDs) and low-side sensing (common-cathode strings) without level-shifting components. |
| C/10 charge termination indication | Generates OPENLED assertion when VISP–ISN falls below 25mV during constant-current charging-provides simple, reliable end-of-charge signal for Li-ion/supercap systems. |
| Output short-circuit protected boost | Automatically disables GATE/PWMOUT and pulls DIM/SS low for ≥4µs upon detecting VISP–ISN > 600mV-prevents MOSFET destruction during load faults. |
| Thermally enhanced MSOP package | Exposed pad reduces junction-to-board thermal resistance to 4°C/W-enables 60W+ LED drive capability without heatsink in compact form factors. |
Applications
| Automotive Headlamp Driver | Battery Charger Controller |
|---|---|
Use Scenario: Driving high-brightness LED arrays in adaptive front-lighting systems (AFS) requiring precise dimming and thermal management. IC Role / Device Role / Timing Role: Constant-current controller with integrated PWM dimming generator and open-LED fault reporting. Use Value: Enables 3000:1 true-color dimming and AEC-Q100 compliance-meets OEM photometric and reliability requirements for Class III lighting. |
Use Scenario: Charging 12V/24V lead-acid or lithium-based batteries in industrial backup systems with accurate C/10 termination. IC Role / Device Role / Timing Role: Constant-current/constant-voltage regulator with C/10 detection and open-circuit protection. Use Value: Eliminates need for separate charge management IC-reduces system cost and complexity while ensuring safe, compliant charging profiles. |
| Industrial High-Voltage LED String | Supercapacitor Fast-Charge Module |
Use Scenario: Powering >100V LED strings in street lighting or horticultural fixtures using boost topology with grounded anode configuration. IC Role / Device Role / Timing Role: High-side current-sense controller supporting 0V–80V common-mode range and 60V max VIN. Use Value: Enables single-chip solution for high-voltage LED strings without isolated sense amplifiers-improves efficiency and reduces bill-of-materials. |
Use Scenario: Rapidly charging supercapacitors in energy-harvesting or UPS applications requiring precise current limiting and voltage clamping. IC Role / Device Role / Timing Role: Programmable CC/CV regulator with adjustable switching frequency and robust overvoltage protection. Use Value: Delivers fast, controlled charge cycles with built-in FB overvoltage shutdown-prevents capacitor overvoltage failure during transient events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | Fixed 500kHz frequency; no internal PWM generator; requires external dimming signal; ±1.5% current accuracy. | Targeted at non-automotive industrial LED drivers where self-oscillation and AEC-Q100 are not required. | Select when higher current accuracy is critical and external PWM control is preferred over integrated generation. |
| LT3756EMSE#PBF | Wider 3V–100VIN range; no C/10 indication; lacks OPENLED reporting; same 16-pin MSOP package. | Used in general-purpose high-voltage LED drivers where automotive qualification and battery charging features are unnecessary. | Choose for >60V input applications (e.g., 72V industrial rails) where LT3761AIMSE#WTRPBF's 60V limit is insufficient. |
Compared with LTC3783EFE#PBF and LT3756EMSE#PBF, the LT3761AIMSE#WTRPBF uniquely combines AEC-Q100 qualification, integrated PWM dimming, C/10 battery charge signaling, and open-LED fault reporting-making it the only option among the three qualified for automotive headlamp and battery charging co-location.
Availability
LT3761AIMSE#WTRPBF is available at Aetrix Electronics and suitable for automotive lighting systems, industrial battery chargers, high-voltage LED signage, and supercapacitor energy storage modules requiring stable component supply and long-term lifecycle support.
Supply support for LT3761AIMSE#WTRPBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power and signal chain solutions.
The LT3761A product line was designed specifically for high-reliability, high-current LED driving and multi-mode battery charging-emphasizing AEC-Q100 compliance, wide input range, and integrated protection features for harsh-environment applications.
FAQ
What is the primary function of the LT3761AIMSE#WTRPBF in LED driver designs?
The LT3761AIMSE#WTRPBF functions as a constant-current and constant-voltage DC/DC controller optimized for high-power LED driving. It regulates LED current with ±3% accuracy and output voltage with ±2% accuracy, supports boost, SEPIC, buck-boost, and flyback topologies, and integrates features like programmable PWM dimming, open-LED detection, and output short-circuit protection-all critical for automotive headlamp and industrial lighting systems using the LT3761AIMSE#WTRPBF.
Does the LT3761AIMSE#WTRPBF support both high-side and low-side current sensing?
Yes, the LT3761AIMSE#WTRPBF supports both configurations via dedicated ISP and ISN pins with a rail-to-rail 0V–80V common-mode input range. This allows flexible implementation-high-side sensing for grounded-anode LED strings or low-side sensing for common-cathode arrangements-without external level shifters. The LT3761AIMSE#WTRPBF maintains full accuracy and protection functionality in either configuration, as verified in the datasheet's Electrical Characteristics table and Pin Functions section.
How does the internal PWM dimming generator in the LT3761AIMSE#WTRPBF operate?
The LT3761AIMSE#WTRPBF's internal PWM generator uses the DIM/SS pin current to set charging/discharging rates of an external capacitor on the PWM pin, producing a self-oscillating signal with frequency 215Hz–400Hz and duty ratio 4%–96%. The DIM/SS current directly controls both frequency and duty-enabling simple, low-component-count dimming without external timing ICs. This behavior is confirmed in the Typical Performance Characteristics (Figures G16–G17) and Pin Functions description for the LT3761AIMSE#WTRPBF.
What protection features are integrated into the LT3761AIMSE#WTRPBF?
The LT3761AIMSE#WTRPBF integrates open-LED detection (via FB and ISP/ISN monitoring), output short-circuit protection (triggered by VISP–ISN > 600mV), FB overvoltage shutdown (PWMOUT forced low if FB > VFB + 60mV), thermal shutdown (>165°C), and programmable VIN UVLO with hysteresis. Each feature activates specific fault responses-such as pulling DIM/SS low or asserting OPENLED-documented in the Operation and Pin Functions sections of the LT3761AIMSE#WTRPBF datasheet.
Is the LT3761AIMSE#WTRPBF suitable for battery charging applications?
Yes, the LT3761AIMSE#WTRPBF is explicitly designed for battery and supercapacitor charging, featuring C/10 charge termination indication (via OPENLED assertion when VISP–ISN < 25mV), precise constant-current/constant-voltage regulation, and output short-circuit protection. Its ±3% current accuracy and –40°C to +125°C operating range make it suitable for automotive 12V/24V battery charging and industrial energy storage systems using the LT3761AIMSE#WTRPBF.
LT3761AIMSE#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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):
- Yes
- 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:
- General Purpose
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3761AIMSE#WTRPBF FAQ
1.How can I place an order for LT3761AIMSE#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761AIMSE#WTRPBF 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#WTRPBF reliable?
The price and inventory of LT3761AIMSE#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761AIMSE#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT3761AIMSE#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761AIMSE#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761AIMSE#WTRPBF?
LT3761AIMSE#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761AIMSE#WTRPBF 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#WTRPBF?
For technical support, including LT3761AIMSE#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761AIMSE#WTRPBF requirements.
6.How does Aetrix verify that LT3761AIMSE#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT3761AIMSE#WTRPBF 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#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT3761AIMSE#WTRPBF?
All LT3761AIMSE#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761AIMSE#WTRPBF, 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#WTRPBF part is unused and in its original packaging.
Return procedure for LT3761AIMSE#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3761AIMSE#WTRPBF Tags
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