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Analog Devices Inc. LT3761AIMSE#WPBF
- Part No.:
- LT3761AIMSE#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761AIMSE#WPBF.pdf
- Description:
- IC LED DRV DC DC CTRL PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,163
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Product details
Overview
LT3761AIMSE#WPBF 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 internal PWM dimming (4–96% duty, 300 Hz), and enables up to 3000:1 external PWM dimming ratio. Its rail-to-rail current sense range (0V–80V) allows grounded-anode LED strings >100V.
For engineers reviewing the LT3761AIMSE#WPBF datasheet, LT3761AIMSE#WPBF pinout, LT3761AIMSE#WPBF application, or LT3761AIMSE#WPBF equivalent, key selection criteria include AEC-Q100 qualification, high-side/low-side current sensing flexibility, programmable 100kHz–1MHz switching frequency, C/10 battery charge indication, and open-LED fault reporting via OPENLED pin.
Technical Context
The LT3761AIMSE#WPBF implements a fixed-frequency current-mode control architecture with dual-loop capability: the ISP/ISN differential input regulates output current via transconductance error amplifier VC, while FB regulates output voltage using a 1.25V reference. The CTRL pin linearly adjusts the full-scale current sense threshold from 21mV to 258mV (0–1.0V), enabling analog dimming and temperature compensation.
Its integrated PWM signal generator uses DIM/SS pin current to set PWMOUT duty ratio (3.2–97%) and frequency (215–400 Hz with 47nF capacitor), eliminating need for external timing components. Protection features include ISP/ISN overcurrent detection (>600mV), FB overvoltage shutdown (+60mV), open-LED latching, and thermal shutdown at 165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports 12V/24V/48V automotive and industrial rails without pre-regulation |
| Current Regulation Accuracy | ±3% - ensures stable LED brightness across temperature and line variations |
| Voltage Regulation Accuracy | ±2% - enables precise CV mode for battery/supercapacitor charging |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor to balance efficiency, EMI, and inductor size |
| Internal PWM Dimming Range | 4% to 96% duty, 300Hz - provides flicker-free analog-like dimming without external oscillator |
| Rail-to-Rail Sense Range | 0V to 80V - permits high-side current sensing on grounded-anode LED strings >100V |
| Shutdown Current | <1µA - minimizes battery drain in always-on automotive systems |
Pinout & Package
LT3761AIMSE#WPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17) soldered to PCB ground for thermal dissipation (θJA = 43°C/W). The package is AEC-Q100 qualified for automotive underhood operation (–40°C to +125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output | Drives NMOS disconnect FET; toggles low during FB overvoltage fault to isolate LED load |
| FB (2) | Voltage feedback input | Sets CV regulation point at 1.25V; triggers OPENLED assertion when <1.205V and ISP–ISN <25mV |
| ISN (3) | Negative current sense input | Completes Kelvin connection to current sense resistor; bias current varies with CTRL voltage |
| ISP (4) | Positive current sense input | Accepts up to 80V common-mode; detects overcurrent if ISP–ISN >600mV |
| VC (5) | Error amplifier output | High-impedance node storing demand current state; requires RC network for loop stability |
| CTRL (6) | Current threshold adjust | Linearly scales VISP–ISN from 21mV to 258mV (0–1.0V); enables analog dimming and thermal compensation |
| VREF (7) | 2.02V reference output | Supplies up to 185µA; used to bias CTRL divider or temperature-sensing circuitry |
| PWM (8) | Digital dimming input | Accepts external PWM signal (200µA drive); self-oscillates with capacitor to GND for internal dimming |
| OPENLED (9) | Open-load fault indicator | Open-drain output pulled low when FB <1.205V AND ISP–ISN <25mV; requires external pull-up |
| DIM/SS (10) | Soft-start & PWM generator control | 14µA internal pull-up sets PWMOUT duty/frequency; capacitor sets soft-start time |
| RT (11) | Frequency programming | Resistor to GND sets switching frequency (e.g., 95.3kΩ = 100kHz) |
| EN/UVLO (12) | Enable & undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.3µA pull-down enables programmable UVLO |
| INTVCC (13) | Internal LDO output | 7.85V regulated supply for gate drivers; requires 1µF ceramic bypass to exposed pad GND |
| VIN (14) | Main power input | Supplies INTVCC LDO; must be bypassed with ≥0.22µF low-ESR capacitor |
| SENSE (15) | Switch current sense | Kelvin-connected to source of external NFET; limits peak switch current at 105mV |
| GATE (16) | NFET gate driver | Swings between INTVCC and GND; drives external power switch with 25ns rise/fall times |
| GND (17) | Power & signal ground | Exposed pad; must be soldered to PCB ground plane for thermal and current sense integrity |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade I qualification | Validated for automotive underhood use (–40°C to +125°C junction) |
| Programmable internal PWM generator | Eliminates external oscillator; 300Hz base frequency with 4–96% adjustable duty |
| 3000:1 external PWM dimming ratio | Enables true-color LED dimming without color shift in display and headlamp applications |
| Ground-referred current sense | Supports high-voltage LED strings with grounded anode configuration, simplifying layout |
| C/10 charge termination indication | Provides accurate battery/supercapacitor end-of-charge signal via ISP–ISN threshold |
| Output short-circuit protected boost | Detects ISP–ISN >600mV and forces GATE/PWMOUT low within microseconds |
Applications
| Automotive Headlamp Driver | Battery Charger Controller |
|---|---|
Use Scenario: Driving high-brightness LED arrays in adaptive front-lighting systems (AFS) requiring precise current control and wide dimming range. IC Role / Device Role / Timing Role: Constant-current controller with internal PWM dimming and open-LED fault reporting. Use Value: Enables 25:1 internal dimming and 3000:1 external dimming for glare-free dynamic beam shaping without color shift. |
Use Scenario: Charging 12V–48V lead-acid or LiFePO₄ batteries with C/10 termination and constant-voltage float regulation. IC Role / Device Role / Timing Role: Dual-loop CC/CV regulator with C/10 detection and FB overvoltage protection. Use Value: Accurate ±2% voltage regulation and C/10 threshold (25mV) ensure safe, reliable battery charging without external comparators. |
| Industrial High-Voltage Lighting | Supercapacitor Backup Power |
Use Scenario: Powering >100V LED strings in streetlights or tunnel lighting where grounded-anode topology reduces EMI and improves safety. IC Role / Device Role / Timing Role: High-side current sense controller with 0V–80V rail-to-rail ISP/ISN input range. Use Value: Eliminates need for isolated sense amplifiers; supports direct Kelvin connection to sense resistor at high common-mode voltage. |
Use Scenario: Managing charge/discharge cycles in industrial backup power systems using 2.7V–5.5V supercapacitors. IC Role / Device Role / Timing Role: Precision current-limited voltage regulator with programmable soft-start and shutdown IQ <1µA. Use Value: Ensures controlled inrush current during supercapacitor charging and zero-load standby current for long-term energy retention. |
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 200kHz frequency; no internal PWM generator; requires external dimming signal | Lacks integrated dimming oscillator and C/10 indication; suited for simpler CV-only or externally dimmed systems | Select when internal PWM generation and battery charge features are unnecessary and cost sensitivity is high |
| LT3756EMSE#PBF | Wider 6V–100VIN range; no AEC-Q100 qualification; lower current accuracy (±5%) | Targeted at industrial/high-voltage LED drivers, not automotive; lacks C/10 and OPENLED reporting | Choose for non-automotive >60V applications where extended input range outweighs automotive reliability requirements |
Compared with LTC3783EFE#PBF and LT3756EMSE#PBF, LT3761AIMSE#WPBF uniquely combines AEC-Q100 qualification, internal PWM dimming, C/10 battery charge indication, and open-LED fault reporting in a single 16-lead MSOP package-making it the only drop-in solution for automotive LED headlamp and battery charger designs requiring all four functions.
Availability
LT3761AIMSE#WPBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial LED lighting, and battery/supercapacitor charging applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT3761AIMSE#WPBF 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.
The LT3761A product line delivers highly integrated, AEC-Q100-qualified LED controllers with dual-loop CC/CV regulation, designed specifically for demanding automotive lighting and energy storage applications.
FAQ
What is the operating temperature range for LT3761AIMSE#WPBF?
The LT3761AIMSE#WPBF is rated for –40°C to +125°C junction temperature and is AEC-Q100 qualified for automotive Grade I applications. This rating is confirmed in the Order Information table and Absolute Maximum Ratings section of the official datasheet, where both LT3761AE and LT3761AI variants share identical temperature specifications. The "I" grade denotes industrial/automotive qualification, and the #WPBF suffix confirms automotive-grade packaging and test screening.
Does LT3761AIMSE#WPBF support high-side current sensing?
Yes, LT3761AIMSE#WPBF supports true high-side current sensing via the ISP and ISN pins, which accept a common-mode voltage range of 0V to 80V. This enables direct sensing on the high side of grounded-anode LED strings exceeding 100V total voltage, as explicitly stated in the FEATURES list and verified in the Absolute Maximum Ratings (ISP, ISN ≤ 80V) and Electrical Characteristics (ISP/ISN Input Common Mode Range = 0V to 80V).
How does the internal PWM dimming function work on LT3761AIMSE#WPBF?
The LT3761AIMSE#WPBF generates an internal PWM signal on the PWMOUT pin using the DIM/SS pin current to set duty ratio (3.2–97%) and frequency (215–400 Hz with 47nF capacitor). As described in the PWM Pin Signal Generator section, IDIM/SS controls pull-up/pull-down currents in the PWM oscillator, directly determining output duty cycle without external clock sources-enabling flicker-free dimming at ~300 Hz base frequency.
What protection features are built into LT3761AIMSE#WPBF?
LT3761AIMSE#WPBF integrates multiple hardware-based protections: open-LED detection (via FB <1.205V + ISP–ISN <25mV), FB overvoltage shutdown (+60mV threshold), ISP/ISN overcurrent latch-off (>600mV), thermal shutdown at 165°C, and VIN undervoltage lockout with programmable hysteresis. All are detailed in the FEATURES list and validated in the Electrical Characteristics and Operation sections of the datasheet.
Can LT3761AIMSE#WPBF be used for battery charging applications?
Yes, LT3761AIMSE#WPBF is explicitly designed for battery and supercapacitor charging, as confirmed in the APPLICATIONS section and DESCRIPTION paragraph. Its C/10 indication feature (triggered at 25mV ISP–ISN threshold), ±2% constant-voltage regulation, and programmable soft-start enable accurate, safe charging of 12V–48V battery systems-verified by the "C/10 Indication for Battery Chargers" feature bullet and associated electrical specs.
LT3761AIMSE#WPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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):
- 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#WPBF FAQ
1.How can I place an order for LT3761AIMSE#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761AIMSE#WPBF 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#WPBF reliable?
The price and inventory of LT3761AIMSE#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761AIMSE#WPBF is usually 5 days.
3.What payment methods are accepted for LT3761AIMSE#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761AIMSE#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761AIMSE#WPBF?
LT3761AIMSE#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761AIMSE#WPBF 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#WPBF?
For technical support, including LT3761AIMSE#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761AIMSE#WPBF requirements.
6.How does Aetrix verify that LT3761AIMSE#WPBF is sourced from the original manufacturer or authorized distributors?
All LT3761AIMSE#WPBF 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#WPBF meets industry standards.
7.What is the process for return or replacement of LT3761AIMSE#WPBF?
All LT3761AIMSE#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761AIMSE#WPBF, 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#WPBF part is unused and in its original packaging.
Return procedure for LT3761AIMSE#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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