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Analog Devices Inc. LT3763EFE#PBF
- Part No.:
- LT3763EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3763EFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:510
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Product details
Overview
LT3763EFE#PBF from Analog Devices is a 60V, synchronous step-down LED driver controller with average current mode control, supporting up to 20A output current, ±6% current regulation accuracy, 6V–60V input range, and programmable 200kHz–1MHz switching frequency. It regulates LED current in high-power architectural lighting systems using external sense resistors and dual analog CTRL pins.
For engineers reviewing the LT3763EFE#PBF datasheet, LT3763EFE#PBF pinout, LT3763EFE#PBF application, or LT3763EFE#PBF equivalent, key selection considerations include its dual-input current control (CTRL1/CTRL2), integrated input/output current monitoring (IVINMON/ISMON), open/short/C/10 fault detection, and thermally enhanced 28-lead FE (TSSOP) package with exposed pad.
Technical Context
The LT3763EFE#PBF implements fixed-frequency average current mode control with independent voltage regulation loop (1.206V FB reference, ±1.5% accuracy) and overvoltage lockout at 1.515V. Its current regulation loop accepts three analog inputs-CTRL1, CTRL2, and FBIN-with the lowest voltage determining output current setpoint.
It integrates dual current sensing paths: input current monitoring via IVINP/IVINN (50mV full-scale limit), output current sensing via SENSE+/SENSE– (51mV typical sense voltage), plus dedicated PWM dimming interface (PWM/PWM_OUT) with 11ns rising/38ns falling propagation delay and 0.9Ω pull-down driver impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports wide-range industrial and automotive power rails without pre-regulation. |
| Max Output Current | 20A - enables single-chip control of high-brightness LED strings or laser diodes. |
| Current Regulation Accuracy | ±6% - ensures consistent luminance across temperature and line variations in LED lighting. |
| Switching Frequency Range | 200kHz to 1MHz - adjustable via RT resistor or SYNC pin for EMI optimization and inductor size reduction. |
| Voltage Regulation Accuracy | ±1.5% - maintains stable output voltage during transition between current- and voltage-mode regulation. |
| Shutdown Current | <2µA - minimizes battery drain in solar-powered or standby-critical applications. |
| Thermal Shutdown Threshold | 165°C with –5°C hysteresis - protects against sustained overload while allowing brief thermal transients. |
Pinout & Package
LT3763EFE#PBF uses a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed pad (Pin 29) soldered to PCB ground for optimal thermal dissipation (θJA = 30°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG (Pin 1) | Low-side FET gate driver | 2.2Ω pull-up / 1Ω pull-down impedance drives external NMOS; must not be forced externally. |
| CTRL1 (Pin 14) | Analog current setpoint input | 0–1.5V range sets regulated output current; clamped above 1.5V; buffered to internal 90kΩ resistor. |
| SENSE+ / SENSE– (Pins 17/16) | Output current sense differential inputs | Measure voltage drop across external sense resistor; 51mV typical full-scale corresponds to 20A with 2.5mΩ resistor. |
| IVINP / IVINN (Pins 7/6) | Input current sense differential inputs | Monitor supply current; 50mV full-scale enables precise input current limiting and power tracking. |
| PWM / PWM_OUT (Pins 22/24) | Dedicated LED dimming interface | PWM pin controls dimming enable; PWM_OUT drives external FET with 0.9Ω pull-down for true-color PWM dimming up to 3000:1. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-input current control | CTRL1, CTRL2, and FBIN pins allow dynamic current scaling based on thermal feedback or input voltage (e.g., solar MPPT). |
| Integrated current monitors | IVINMON and ISMON provide buffered 0–1V outputs proportional to input/output current (20× gain), enabling real-time power telemetry without external op-amps. |
| Comprehensive fault protection | Detects open LED (FB > 1.16V + C/10), short LED (FB < 0.25V), and overvoltage (FB > 1.515V) with dedicated FAULT pin and 50mV hysteresis. |
| Programmable soft-start | SS pin accepts external capacitor charged at 11µA; overrides CTRL1/CTRL2 during startup to prevent inrush current overshoot. |
| Accurate 2V reference | VREF pin delivers 1.94–2.06V (±1.5%) with 0.5mA drive capability, enabling precision resistor-divider biasing for CTRL pins. |
Applications
| High-Power Architectural Lighting | Automotive Headlamp Systems |
|---|---|
Use Scenario: Driving multi-string, high-lumen LED arrays in commercial building façades with thermal derating and DALI-compatible dimming. IC Role / Device Role / Timing Role: Primary current regulator and fault monitor; manages 20A output with ±6% accuracy while detecting open/short LED conditions. Use Value: Eliminates need for external current-sense amplifiers and discrete fault comparators, reducing BOM count and PCB area by >30%. | Use Scenario: Adaptive front-lighting system (AFS) requiring precise current control across varying battery voltages (9–16V) and ambient temperatures. IC Role / Device Role / Timing Role: Synchronous buck controller with input current limiting and thermal foldback via CTRL2 pin. Use Value: Maintains consistent beam intensity despite cold-cranking voltage dips and engine-off thermal soak, meeting ISO 16750-2 requirements. |
| Solar-Powered LED Streetlights | Laser Diode Driver for Industrial Sensing |
Use Scenario: Off-grid streetlight with SLA battery charging and LED load powered from variable PV input (18–60V). IC Role / Device Role / Timing Role: Peak power tracker via FBIN pin; regulates LED current based on instantaneous input voltage to maximize energy harvest. Use Value: Increases usable daily operating time by 18–22% compared to fixed-current drivers under partial shading conditions. | Use Scenario: Pulsed laser diode driver in LiDAR modules requiring fast, accurate current pulses with minimal overshoot. IC Role / Device Role / Timing Role: High-bandwidth current controller with 50ns minimum on-time and 140ns minimum off-time for precise pulse shaping. Use Value: Enables sub-10ns current rise/fall times with <1% pulse-to-pulse variation, critical for time-of-flight measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current LED driver controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3756EFE#PBF | Supports SEPIC/boost topology; lower max output current (15A); no FBIN pin; 100kHz–1MHz frequency range. | Better suited for boost-based constant-current drivers where input < output voltage; lacks peak power tracking. | Select when topology flexibility (boost/SEPIC) outweighs need for solar MPPT or 20A capability. |
| LM3410XSDX/NOPB | Integrated 1.5A MOSFET; fixed 1.6MHz frequency; no input current sensing; only single CTRL pin. | Targeted at low-power portable LED apps; lacks fault diagnostics, thermal control, and high-current scalability. | Choose for space-constrained, cost-sensitive designs below 2A where full feature set is unnecessary. |
Compared with LT3763EFE#PBF, LT3756EFE#PBF offers topology versatility but sacrifices input current monitoring and solar tracking, while LM3410XSDX/NOPB trades integration density for reduced functionality and current capability-making LT3763EFE#PBF the sole choice for 20A, fault-aware, MPPT-capable LED systems.
Availability
LT3763EFE#PBF is available at Aetrix Electronics and suitable for high-power architectural lighting, automotive headlamp systems, and solar-powered LED streetlights requiring stable component supply and long-term production continuity.
Supply support for LT3763EFE#PBF 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 LT3763 product line delivers high-current, fault-resilient LED driver controllers optimized for demanding lighting and power conversion applications where precision current regulation, wide input range, and comprehensive protection are mandatory.
FAQ
What is the maximum output current supported by the LT3763EFE#PBF?
The LT3763EFE#PBF supports up to 20A regulated output current when used with appropriate external power FETs, inductor, and 2.5mΩ sense resistor. Its ±6% current regulation accuracy holds across –40°C to 125°C junction temperature, verified per Electrical Characteristics table on page 3 of the official datasheet.
How does the LT3763EFE#PBF implement input current limiting?
The LT3763EFE#PBF uses IVINP and IVINN pins to sense voltage across an external input current sense resistor. When the differential voltage reaches 50mV (typical), the controller reduces inductor current to maintain that threshold-enabling precise input power capping. This function is independent of output current regulation and documented in the "Input Current Limit Sense Voltage" specification.
Can the LT3763EFE#PBF be synchronized to an external clock?
Yes, the LT3763EFE#PBF supports frequency synchronization via the SYNC pin, which accepts external clock signals with precise 1.5V (falling) and 2.175V (rising) thresholds. The internal oscillator must be set ≥20% slower than the SYNC frequency using the RT resistor, as specified in the "SYNC Pin Threshold" and "Switching Frequency" sections of the datasheet.
What protection features are built into the LT3763EFE#PBF?
The LT3763EFE#PBF integrates open LED (FB > 1.16V + C/10), short LED (FB < 0.25V), overvoltage (FB > 1.515V), overcurrent (SENSE+–SENSE– > 85mV), thermal shutdown (165°C), and input undervoltage lockout (EN/UVLO hysteresis = 185mV). All protections assert the FAULT pin and disable switching, with recovery hysteresis to prevent chatter.
What is the purpose of the FBIN pin on the LT3763EFE#PBF?
The FBIN pin on the LT3763EFE#PBF enables peak power tracking for solar-powered applications: when FBIN rises above 1.206V, it linearly increases regulated output current up to the CTRL1/CTRL2 limit, maximizing energy extraction from PV panels. If unused, FBIN must be tied to VREF (2V) to avoid unintended current modulation.
LT3763EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- 55V
- Current - Output / Channel:
- -
- Frequency:
- 200kHz ~ 1MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3763EFE#PBF FAQ
1.How can I place an order for LT3763EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3763EFE#PBF 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 LT3763EFE#PBF reliable?
The price and inventory of LT3763EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3763EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3763EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3763EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3763EFE#PBF?
LT3763EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3763EFE#PBF 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 LT3763EFE#PBF?
For technical support, including LT3763EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3763EFE#PBF requirements.
6.How does Aetrix verify that LT3763EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3763EFE#PBF 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 LT3763EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3763EFE#PBF?
All LT3763EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3763EFE#PBF, 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 LT3763EFE#PBF part is unused and in its original packaging.
Return procedure for LT3763EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3763EFE#PBF Tags
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