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Analog Devices Inc. LT3761AEMSE#WPBF
- Part No.:
- LT3761AEMSE#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761AEMSE#WPBF.pdf
- Description:
- IC LED DRV DC DC CTRL PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,008
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Product details
Overview
LT3761AEMSE#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 100kHz–1MHz switching frequency, enables 3000:1 true-color PWM dimming, and integrates internal PWM generator with 4%–96% programmable duty cycle.
For engineers reviewing the LT3761AEMSE#WPBF datasheet, LT3761AEMSE#WPBF pinout, LT3761AEMSE#WPBF application, or LT3761AEMSE#WPBF equivalent, key selection considerations include high-side/low-side current sensing capability (0V–80V rail-to-rail), AEC-Q100 qualification, open-LED fault reporting via OPENLED pin, and C/10 battery charge termination support.
Technical Context
The LT3761AEMSE#WPBF employs fixed-frequency current-mode control with integrated transconductance error amplifier (VC) and dual-loop regulation-current sense (ISP/ISN) and voltage feedback (FB). Its architecture supports boost, SEPIC, inverting, buck, buck-boost, and flyback topologies through external MOSFET control.
It features independent analog dimming (CTRL pin, 0–1.0V linear range) and digital PWM dimming (PWM pin, up to 3000:1 ratio), with internal PWM generator driven by DIM/SS pin current (14µA typical pull-up) and 47nF capacitor-defined frequency (~300Hz typical). The device includes overvoltage protection (FB > VFB + 60mV), open-LED detection (FB < VFB – 50mV & VISP–ISN < 25mV), and short-circuit shutdown (VISP–ISN > 600mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide automotive battery transients and industrial 24/48V rails without pre-regulation. |
| Current Regulation Accuracy | ±3% - ensures consistent LED brightness across temperature and line variations. |
| Voltage Regulation Accuracy | ±2% - enables stable constant-voltage operation for battery/supercapacitor charging. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor to balance efficiency, EMI, and magnetics size. |
| PWM Dimming Ratio | Up to 3000:1 - preserves LED color fidelity during deep dimming in automotive and architectural lighting. |
| Current Sense Range | Rail-to-rail 0V to 80V - allows high-side or low-side sensing with grounded-anode LED strings >100V. |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood automotive use. |
| Shutdown Current | <1µA - minimizes standby power loss in always-on vehicle systems. |
Pinout & Package
LT3761AEMSE#WPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17 = GND), θJA = 43°C/W. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| 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 to protect LEDs. |
| FB (2) | Voltage feedback input | Sets constant-voltage regulation point at 1.25V; enables open-LED detection when combined with ISP/ISN monitoring. |
| 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 voltage; triggers overcurrent shutdown if VISP–ISN > 600mV. |
| VC (5) | Error amplifier output | High-impedance node storing demand current state; requires RC compensation network for loop stability. |
| CTRL (6) | Analog dimming / current threshold adjust | Linearly scales current sense 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. |
| PWM (8) | Digital dimming enable / oscillator control | Starts/stops switching; self-oscillates with external capacitor to generate internal PWM signal. |
| OPENLED (9) | Open-drain fault status output | Pulls low when FB < VFB – 50mV AND VISP–ISN < 25mV - signals LED string disconnection or CV mode transition. |
| DIM/SS (10) | Soft-start / PWM generator programming | Charging current sets PWMOUT duty cycle; resets on UVLO, overcurrent, or thermal fault. |
| RT (11) | Frequency adjustment | Resistor to GND programs switching frequency from 100kHz to 1MHz per datasheet curve. |
| EN/UVLO (12) | Enable / undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; pulls down 2.3µA to set rising hysteresis externally. |
| INTVCC (13) | Internal LDO output (7.85V) | Power source for GATE/PWMOUT drivers; requires 1µF ceramic bypass close to pin and exposed pad. |
| VIN (14) | Main supply input | Feeds 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 for current-mode control. |
| GATE (16) | N-channel MOSFET gate driver | Swings between INTVCC and GND; drives external power FET with 25ns rise/fall times (3300pF load). |
| GND (17) | Ground / exposed thermal pad | Reference for SENSE, ISN, and all internal circuits; must be soldered to PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PWM dimming generator | Eliminates need for external oscillator; duty cycle (4%–96%) and frequency (~300Hz) set by DIM/SS current and PWM capacitor. |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood operation from –40°C to +125°C junction temperature. |
| High-voltage current sense interface | Supports 0V–80V rail-to-rail ISP/ISN common-mode range - enables grounded-anode LED strings >100V without level shifters. |
| Dual-loop protection architecture | Simultaneous monitoring of FB (open-LED), ISP/ISN (overcurrent/short-circuit), and thermal limit ensures robust system-level fault coverage. |
| C/10 charge termination signaling | Generates precise 25mV C/10 threshold at ISP/ISN for battery charger applications - eliminates external comparator. |
| Low shutdown IQ & fast start-up | <1µA shutdown current; soft-start interval controlled by DIM/SS capacitor - prevents inrush in high-power LED arrays. |
Applications
| Automotive Headlamp Driver | Battery & Supercapacitor Charger |
|---|---|
|
Use Scenario: High-brightness LED headlamp module requiring precise current regulation, deep dimming, and fault reporting in 12V/24V vehicle systems. IC Role / Device Role / Timing Role: Constant-current controller managing boost converter with external NFET; provides PWMOUT-driven LED disconnect and OPENLED fault flag. Use Value: Enables 3000:1 true-color PWM dimming and AEC-Q100-compliant operation - meets automotive functional safety requirements for adaptive driving beams. |
Use Scenario: 12V–48V industrial battery charger or supercapacitor bank charger needing accurate C/10 termination and constant-voltage hold. IC Role / Device Role / Timing Role: Dual-loop regulator operating in constant-current then constant-voltage mode; uses FB for voltage regulation and ISP/ISN for C/10 cutoff. Use Value: Integrated C/10 threshold (25mV) and ±2% voltage regulation eliminate external sensing components - reduces BOM count and improves charge accuracy. |
| Industrial High-Voltage LED Lighting | Accurate Current-Limited Voltage Regulator |
|
Use Scenario: Factory floor or outdoor LED fixture with >100V LED strings powered from 48V DC distribution bus. IC Role / Device Role / Timing Role: High-side current sense controller in boost configuration; leverages 0V–80V ISP/ISN common-mode range for grounded-anode topology. Use Value: Eliminates need for isolated current sense amplifiers or floating supplies - simplifies layout and improves reliability in high-voltage lighting systems. |
Use Scenario: Precision lab power supply or test equipment requiring stable, current-limited output with fast transient response. IC Role / Device Role / Timing Role: Dual-loop regulator using FB for voltage setpoint and ISP/ISN for current limit; VC loop compensation enables tight bandwidth control. Use Value: ±3% current limit accuracy and programmable switching frequency allow optimization for low-noise or high-efficiency operation - critical for metrology-grade supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#PBF | 4-phase synchronous buck-boost controller; no integrated PWM generator; requires external dimming IC. | Targeted at high-power multi-string LED arrays with phase interleaving; lacks open-LED reporting and C/10 charge function. | Select when higher efficiency (>95%) and lower EMI are required for multi-kW lighting; not drop-in for single-string automotive headlamps. |
| LM3410XSDX/NOPB | 600kHz fixed-frequency boost controller; no voltage feedback loop; no AEC-Q100 qualification; max VIN = 42V. | Designed for cost-sensitive portable LED flashlights; lacks constant-voltage regulation, open-LED detection, and automotive temperature range. | Select for non-automotive, low-cost boost LED drivers where only constant-current operation is needed and ambient temperature stays below 85°C. |
Compared with LTC3789EMSE#PBF and LM3410XSDX/NOPB, LT3761AEMSE#WPBF uniquely combines AEC-Q100 qualification, integrated PWM dimming generator, dual-loop (CC/CV) regulation, and 0V–80V current sense range - making it the only option suitable for automotive headlamp designs requiring functional safety and true-color dimming.
Availability
LT3761AEMSE#WPBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-voltage LED lighting, battery/supercapacitor charging modules, and precision current-limited power supplies requiring stable component supply and long-term lifecycle support.
Supply support for LT3761AEMSE#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 industrial, automotive, communications, and healthcare markets.
The LT3761A product line delivers high-voltage, high-accuracy LED controllers with integrated protection and automotive qualification - designed specifically for demanding lighting and power conversion applications where reliability, dimming fidelity, and fault resilience are critical.
FAQ
What is the key difference between LT3761AEMSE#WPBF and the standard LT3761AEMSE#PBF?
The LT3761AEMSE#WPBF is the automotive-grade variant with controlled manufacturing and AEC-Q100 qualification (Grade 1, –40°C to +125°C), indicated by the "W" suffix. The LT3761AEMSE#PBF is the commercial version without automotive qualification or extended reliability testing. Both share identical electrical specifications and pinout, but only LT3761AEMSE#WPBF is approved for automotive safety-critical lighting systems.
Can LT3761AEMSE#WPBF drive LEDs in buck configuration?
Yes, LT3761AEMSE#WPBF supports buck, boost, SEPIC, inverting, buck-boost, and flyback topologies via external MOSFET control. In buck mode, it regulates LED current using low-side current sensing (SENSE to GND) and requires proper gate drive timing and diode placement. The datasheet provides verified buck-mode application circuits with efficiency and thermal performance data.
How does the internal PWM generator in LT3761AEMSE#WPBF achieve 3000:1 dimming ratio?
The LT3761AEMSE#WPBF achieves 3000:1 true-color PWM dimming by combining external PWM signal control (up to 3000:1) with its internal PWM generator's precise duty-cycle control (4%–96%) and low-jitter oscillator. When driven externally, the PWM pin accepts clean digital signals with sub-microsecond edge timing, enabling deep dimming without color shift - a feature validated in automotive headlamp reference designs.
What protection features does LT3761AEMSE#WPBF provide for LED string faults?
LT3761AEMSE#WPBF provides three LED-specific protections: (1) Open-LED detection via OPENLED pin assertion when FB < VFB – 50mV and VISP–ISN < 25mV; (2) FB overvoltage shutdown (PWMOUT forced low) when FB > VFB + 60mV; and (3) Output short-circuit protection via VISP–ISN > 600mV triggering immediate GATE/PWMOUT shutdown and DIM/SS pull-down.
Is LT3761AEMSE#WPBF compatible with high-side current sensing above 60V LED string voltage?
Yes, LT3761AEMSE#WPBF supports high-side current sensing with rail-to-rail ISP/ISN common-mode range of 0V to 80V - enabling direct sensing on LED strings exceeding 100V total voltage when used in boost topology. This eliminates level-shifting circuitry and maintains ±3% current accuracy across the full operating temperature range.
LT3761AEMSE#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
LT3761AEMSE#WPBF FAQ
1.How can I place an order for LT3761AEMSE#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761AEMSE#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 LT3761AEMSE#WPBF reliable?
The price and inventory of LT3761AEMSE#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761AEMSE#WPBF is usually 5 days.
3.What payment methods are accepted for LT3761AEMSE#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761AEMSE#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761AEMSE#WPBF?
LT3761AEMSE#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761AEMSE#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 LT3761AEMSE#WPBF?
For technical support, including LT3761AEMSE#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761AEMSE#WPBF requirements.
6.How does Aetrix verify that LT3761AEMSE#WPBF is sourced from the original manufacturer or authorized distributors?
All LT3761AEMSE#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 LT3761AEMSE#WPBF meets industry standards.
7.What is the process for return or replacement of LT3761AEMSE#WPBF?
All LT3761AEMSE#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761AEMSE#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 LT3761AEMSE#WPBF part is unused and in its original packaging.
Return procedure for LT3761AEMSE#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3761AEMSE#WPBF Tags
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