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Analog Devices Inc. LT3763IFE#TRPBF
- Part No.:
- LT3763IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3763IFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,785
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Product details
Overview
LT3763IFE#TRPBF from Analog Devices is a 60V, synchronous step-down LED driver controller delivering up to 20A output current with ±6% current regulation accuracy and ±1.5% voltage regulation accuracy. It features dual analog control inputs (CTRL1/CTRL2), input/output current sensing, PWM dimming support, and operates across 6V–60V input range for high-power architectural and automotive lighting systems.
For engineers reviewing the LT3763IFE#TRPBF datasheet, LT3763IFE#TRPBF pinout, LT3763IFE#TRPBF application, or LT3763IFE#TRPBF equivalent, key selection considerations include its 28-lead TSSOP thermally enhanced package, 200kHz–1MHz programmable switching frequency, integrated input/output current monitors (IVINMON/ISMON), and fault detection for open/short/C/10 LED conditions.
Technical Context
The LT3763IFE#TRPBF implements fixed-frequency average current mode control with independent inductor current regulation over 0V–55V output range. Its dual-input current control loop accepts analog voltages on CTRL1 and CTRL2 (0–1.5V range), clamped internally, and uses a 90kΩ internal resistor to generate reference current for precise RS-based current setting.
Voltage regulation is enforced via FB pin with 1.206V reference and overvoltage lockout at 1.515V; input current limiting is implemented through IVINP/IVINN differential sensing with 50mV threshold. The device integrates NMOS gate drivers (TG/BG) with non-overlap timing (42–44ns), soft-start (11µA charging current), and thermal shutdown at 165°C with –5°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports wide-range industrial and automotive supplies without external pre-regulation. |
| Output Current Accuracy | ±6% - ensures stable LED brightness across temperature and line variations in high-power lighting. |
| Voltage Regulation Accuracy | ±1.5% - maintains tight output voltage during CV mode, critical for battery charging and laser diode biasing. |
| Switching Frequency Range | 200kHz to 1MHz - adjustable via RT resistor or SYNC pin, enabling EMI optimization and inductor size reduction. |
| Shutdown Current | <2µA - enables ultra-low power-off state for solar-powered and battery-backed systems. |
| Current Sense Threshold | 51mV typical (SENSE+ to SENSE–) - sets full-scale 20A output with 2.5mΩ sense resistor, minimizing I²R loss. |
| Thermal Shutdown | 165°C with –5°C hysteresis - protects MOSFETs and PCB during sustained overload or poor heatsinking. |
Pinout & Package
LT3763IFE#TRPBF is housed in a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed pad (Pin 29) soldered to PCB ground for optimal thermal performance (θJA = 30°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG (Pin 1) | Low-side FET gate driver | Drives external NMOS with 2.2Ω pull-up / 1Ω pull-down; must not be externally forced. |
| INTVCC (Pin 2) | Internal 5V regulator output | Supplies BOOST capacitor and digital subcircuits; requires ≥22µF bypass to GND; current-limited to 50mA. |
| VIN (Pin 3) | Main input supply | Accepts 6–60V; requires local ≥4.7µF low-ESR capacitor near exposed pad. |
| EN/UVLO (Pin 4) | Enable and undervoltage lockout | Turns on at 4.0V (typ), off at 1.52V (typ); 185mV hysteresis; full shutdown <0.5V. |
| VREF (Pin 5) | Buffered 2.0V reference | Drives CTRL1/CTRL2 dividers; max 0.5mA load; bypass with ≥1µF to GND. |
| IVINN/IVINP (Pins 6,7) | Differential input current sense inputs | Measure voltage drop across RSENSE_IN; 50mV threshold triggers input current limiting. |
| FAULT (Pin 9) | Open/short/C/10 fault indicator | Active-low open-drain output pulled down when FB <0.25V (short) or >1.16V + C/10 (open). |
| FBIN (Pin 10) | Peak power tracking input | Enables solar charger operation by modulating output current based on input voltage (1.206V–1.26V range). |
| FB (Pin 11) | Voltage feedback input | Regulates output to 1.206V reference; overvoltage protection activates at 1.515V. |
| CTRL1/CTRL2 (Pins 13,14) | Analog current set inputs | 0–1.5V range; lower voltage determines regulated current; clamped internally. |
| SENSE+/SENSE– (Pins 16,17) | Output current sense inputs | Differential pair measuring external sense resistor; 51mV (typ) corresponds to full-scale 20A. |
| PWM_OUT (Pin 24) | External PWM dimming driver | Drives external FET with 2.2Ω pull-up / 0.9Ω pull-down; synchronized with internal PWM logic. |
| TG (Pin 25) | High-side FET gate driver | Drives external NMOS with 2.2Ω pull-up / 1.3Ω pull-down; referenced to SW node. |
| SW (Pin 26) | Switch node | Connects external high/low FETs and inductor; serves as return for BOOST driver. |
| BOOST (Pin 27) | Floating gate drive supply | 5V regulated supply for TG driver; requires Schottky diode from INTVCC to BOOST. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ Dimming | 3000:1 dimming ratio enabled by precise PWM_OUT timing and cycle-by-cycle current control. |
| Integrated Input/Output Monitoring | IVINMON and ISMON provide 0–1V outputs proportional to input/output currents (20× gain), eliminating need for external amplifiers. |
| Programmable Thermal Derating | CTRL2 pin allows dynamic reduction of regulated current based on temperature sensor feedback, preventing thermal runaway. |
| Robust Fault Protection | Dual-comparator FAULT pin detects open LED (FB >1.16V + C/10), shorted LED (FB <0.25V), and overvoltage (FB >1.515V) with 50mV hysteresis. |
| Flexible Frequency Control | RT pin sets frequency from 200kHz–1MHz; SYNC pin accepts external clock up to 1.25MHz with 20% margin requirement. |
Applications
| High-Power Architectural Lighting | Automotive Headlamp Systems |
|---|---|
Use Scenario: Driving multi-string high-brightness LED arrays in commercial building façades and interior accent lighting. IC Role / Device Role / Timing Role: Primary current-regulated step-down controller managing up to 20A total output with synchronized PWM dimming. Use Value: Maintains consistent lumen output across 0–55V LED string voltage variation while supporting 3000:1 True Color PWM™ dimming for smooth color tuning. | Use Scenario: Powering adaptive front-lighting systems (AFS) and matrix LED headlamps requiring precise per-zone current control. IC Role / Device Role / Timing Role: High-reliability LED driver with input current limiting and fault reporting for ISO 16750-compliant automotive environments. Use Value: Enables rapid PWM dimming response (<40ns propagation delay) and robust open/short LED detection to meet ASIL-B functional safety requirements. |
| Solar-Powered SLA Battery Chargers | Aviation/Marine Strobe Lights |
Use Scenario: Regulating charge current into 12V/24V lead-acid batteries from variable-output solar panels. IC Role / Device Role / Timing Role: Peak power tracker using FBIN pin to maximize energy harvest while maintaining constant-current charging profile. Use Value: Increases energy capture by dynamically adjusting output current as panel voltage varies, improving charge efficiency by up to 15% under partial shading. | Use Scenario: Driving high-intensity xenon or LED strobes in aircraft anti-collision and marine navigation lights. IC Role / Device Role / Timing Role: High-voltage capable controller delivering pulsed 20A output with fast turn-on/turn-off for precise flash timing. Use Value: Supports microsecond-level PWM_OUT timing control and thermal derating (via CTRL2) to sustain repeated high-current pulses without overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#TRPBF | Fixed 500kHz frequency; no FBIN pin; lacks input current monitoring; 16-pin TSSOP package. | Targeted at simpler constant-current LED strings without peak power tracking or input current limiting. | Select when system requires lower pin count, fixed frequency, and does not need solar optimization or IVINMON functionality. |
| LM3423MH/NOPB | Asynchronous design; max 60V input but only 3A output; no integrated gate drivers; SOIC-8 package. | Designed for medium-power LED drivers where external MOSFETs and discrete gate drivers are acceptable. | Choose for cost-sensitive, lower-current designs where board space permits external FETs and driver circuitry. |
Compared with LTC3783EFE#TRPBF and LM3423MH/NOPB, the LT3763IFE#TRPBF provides higher output current (20A vs ≤3A), integrated dual gate drivers, input/output current monitoring, and FBIN-based peak power tracking-making it uniquely suited for high-power, solar-integrated, and thermally demanding LED systems.
Availability
LT3763IFE#TRPBF is available at Aetrix Electronics and suitable for high-power architectural lighting, automotive headlamp systems, and solar-powered battery chargers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3763IFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3763IFE#TRPBF belongs to Analog Devices' Power by Linear™ LED driver controller family, engineered for precision current regulation in high-voltage, high-current lighting and power conversion applications.
FAQ
What is the maximum output current capability of the LT3763IFE#TRPBF?
The LT3763IFE#TRPBF supports up to 20A regulated output current when used with appropriate external MOSFETs, inductor, and 2.5mΩ sense resistor. Its ±6% current regulation accuracy holds across temperature and line variations, and the device enforces cycle-by-cycle overcurrent protection at 85mV sense voltage (corresponding to ~34A peak with 2.5mΩ).
How does the LT3763IFE#TRPBF implement input current limiting?
The LT3763IFE#TRPBF uses dedicated IVINP and IVINN pins to monitor differential voltage across an input sense resistor. When this voltage reaches 50mV (typical), the controller reduces inductor current to maintain constant input current. This function is independent of output regulation and supports applications like solar MPPT and input-critical power supplies.
Can the LT3763IFE#TRPBF be synchronized to an external clock source?
Yes, the LT3763IFE#TRPBF supports frequency synchronization via the SYNC pin, which accepts external clock signals up to 1.25MHz. The internal RT-set frequency must be configured at least 20% lower than the SYNC frequency to ensure reliable locking. The SYNC pin has precise 1.5V falling-edge and 2.175V rising-edge thresholds for noise immunity.
What thermal protection features does the LT3763IFE#TRPBF include?
The LT3763IFE#TRPBF incorporates junction temperature monitoring with thermal shutdown activation at 165°C (±5°C) and automatic recovery after cooldown. Additionally, the CTRL2 pin enables active thermal derating: applying a voltage to CTRL2 linearly reduces the regulated output current before shutdown occurs, preserving system functionality under elevated temperatures.
Does the LT3763IFE#TRPBF support true PWM dimming for LEDs?
Yes, the LT3763IFE#TRPBF delivers True Color PWM™ dimming with up to 3000:1 ratio. Its dedicated PWM pin accepts external logic signals, and the PWM_OUT pin drives an external FET with 2.2Ω pull-up / 0.9Ω pull-down impedance. Propagation delays are 11ns (rising) and 38ns (falling), ensuring minimal timing jitter and precise duty-cycle control for flicker-free lighting.
LT3763IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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
LT3763IFE#TRPBF FAQ
1.How can I place an order for LT3763IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3763IFE#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 LT3763IFE#TRPBF reliable?
The price and inventory of LT3763IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3763IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3763IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3763IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3763IFE#TRPBF?
LT3763IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3763IFE#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 LT3763IFE#TRPBF?
For technical support, including LT3763IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3763IFE#TRPBF requirements.
6.How does Aetrix verify that LT3763IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3763IFE#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 LT3763IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3763IFE#TRPBF?
All LT3763IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3763IFE#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 LT3763IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3763IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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