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Analog Devices Inc. LT3763EFE#TRPBF
- Part No.:
- LT3763EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3763EFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,131
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Product details
Overview
LT3763EFE#TRPBF from Analog Devices is a 60V, synchronous step-down LED driver controller with average current mode control, regulating output currents up to 20A across 0–55V output range. It features dual analog current control (CTRL1/CTRL2), input/output current sensing, ±6% current regulation accuracy, and 200kHz–1MHz programmable switching frequency. Used in high-power architectural lighting systems requiring precise dimming and thermal management.
For engineers reviewing the LT3763EFE#TRPBF datasheet, LT3763EFE#TRPBF pinout, LT3763EFE#TRPBF application, or LT3763EFE#TRPBF equivalent, key selection criteria include its 28-lead TSSOP package with exposed pad, 6V–60V input range, integrated PWM driver for true-color dimming, and fault detection for open/short/C/10 LED conditions.
Technical Context
The LT3763EFE#TRPBF implements fixed-frequency average current mode control with independent voltage regulation loop, enabling simultaneous current and voltage regulation. Its error amplifier maintains inductor current regulation over wide output voltage range (0–55V) while FB pin reference is fixed at 1.206V with ±1.5% accuracy.
Input and output current monitoring are implemented via dedicated differential amplifiers (IVINP/IVINN and SENSE+/SENSE–), each producing buffered outputs (IVINMON, ISMON) scaled at 20× sense voltage. Thermal shutdown activates at 165°C with –5°C hysteresis, and EN/UVLO provides precision enable with 185mV hysteresis and <2µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports wide-range DC inputs including automotive battery, solar arrays, and industrial supplies. |
| Output Current Range | Up to 20A - enables high-brightness LED strings without external current amplification. |
| Current Regulation Accuracy | ±6% - ensures consistent LED brightness across temperature and line variations. |
| Switching Frequency | 200kHz to 1MHz - adjustable via RT resistor or SYNC pin; allows EMI optimization and inductor size reduction. |
| Voltage Regulation Accuracy | ±1.5% at FB pin (1.206V reference) - guarantees stable output voltage during transition between current and voltage regulation modes. |
| Shutdown Current | <2µA - minimizes standby power loss in battery-powered or energy-sensitive applications. |
| Package | 28-Lead TSSOP with exposed pad - thermally enhanced for high-power dissipation; requires PCB soldering of exposed pad (Pin 29) to GND plane. |
Pinout & Package
LT3763EFE#TRPBF uses a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed pad (Pin 29) that must be soldered to PCB ground for thermal and electrical integrity. θJA = 30°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG (Pin 1) | Low-side gate driver output | Drives external NMOS with 2.2Ω pull-up / 1Ω pull-down; connects to source of low-side FET. |
| INTVCC (Pin 2) | Internal 5V regulator output | Supplies power to internal circuits and charges BOOST capacitor; bypass with ≥22µF to GND. |
| VIN (Pin 3) | Main input supply | Accepts 6–60V input; requires local ≥4.7µF low-ESR ceramic 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 below 0.5V. |
| VREF (Pin 5) | 2.0V buffered reference | Stable 2V output capable of 0.5mA drive; used to bias CTRL1/CTRL2 via resistor dividers. |
| SENSE+ / SENSE– (Pins 16/17) | Current sense differential inputs | Measure voltage drop across external sense resistor; regulate output current with 51mV (typ) full-scale. |
| PWM_OUT (Pin 24) | LED PWM dimming driver | Open-drain compatible output with 2.2Ω pull-up / 0.9Ω pull-down; drives external MOSFET for high-frequency dimming. |
| TG (Pin 25) | High-side gate driver output | Drives external NMOS with 2.2Ω pull-up / 1.3Ω pull-down; floats relative to SW node. |
| SW (Pin 26) | Switch node | Connects external high-side and low-side FETs and inductor; swings from GND to VIN. |
| BOOST (Pin 27) | Floating gate drive supply | Provides ~5V floating 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 dedicated PWM pin and PWM_OUT driver, preserving LED color fidelity at low duty cycles. |
| Triple-input current control | Simultaneous regulation using CTRL1 (primary current setpoint), CTRL2 (thermal derating), and FBIN (input voltage tracking) - lowest voltage dominates. |
| Integrated current monitoring | IVINMON and ISMON provide buffered 20× scaled outputs (0–1V per 0–50mV sense) for real-time input/output power calculation. |
| Comprehensive fault protection | Detects open-circuit (FB > 1.16V + C/10), short-circuit (FB < 0.25V), overvoltage (FB > 1.515V), and overcurrent (SENSE+–SENSE– > 85mV) with automatic shutdown. |
| Programmable soft-start | SS pin accepts external capacitor charged at 11µA; overrides CTRL1/CTRL2 during startup to limit inrush current and prevent overshoot. |
Applications
| High-Power Architectural Lighting | Automotive Exterior Lighting |
|---|---|
Use Scenario: Multi-string LED luminaires for commercial building facades requiring precise current matching and thermal derating. IC Role / Device Role / Timing Role: Primary current-regulated step-down controller managing up to 20A load with dynamic thermal foldback via CTRL2. Use Value: Maintains ±6% current accuracy across ambient temperatures from –40°C to 125°C, ensuring uniform lumen output and extended LED lifetime. | Use Scenario: Adaptive front-lighting systems (AFS) and DRLs in 12V/24V vehicle platforms with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Synchronous buck controller with input current limiting and PWM dimming for glare-free beam shaping. Use Value: 6V–60V input range accommodates cold-crank and load-dump transients; 3000:1 PWM dimming enables smooth intensity transitions without color shift. |
| Solar-Powered LED Strobes | Laser Diode Power Supply |
Use Scenario: Marine/aviation strobe lights powered by photovoltaic panels with variable input voltage and battery backup. IC Role / Device Role / Timing Role: Peak input power tracker using FBIN pin to maximize energy harvest while regulating LED current. Use Value: FBIN-based input voltage tracking adjusts output current in real time as solar input varies from 12V to 60V, preventing overloading of PV source. | Use Scenario: Precision current source for high-power laser diodes in medical and industrial equipment requiring low-noise, stable bias. IC Role / Device Role / Timing Role: Low-ripple, high-accuracy current regulator with cycle-by-cycle overcurrent protection and fast fault response. Use Value: ±6% current regulation and <5mV C/10 detection threshold ensure safe laser operation; soft-start prevents turn-on surge damaging sensitive diodes. |
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 | Same 28-lead TSSOP package; supports lower max output current (15A) and narrower input range (4.5–40V); lacks FBIN pin and IVINMON functionality. | Not suitable for solar input tracking or >40V input systems; limited thermal derating capability due to missing CTRL2 interface. | Select only when input voltage stays below 40V and peak current ≤15A; verify absence of FBIN requirement in design. |
| LM34927QMH/NOPB | Automotive-grade 20-pin WSON; integrates high-side MOSFET (no external TG/BG); fixed 500kHz frequency; no input current monitoring or FBIN. | Eliminates external power FETs but sacrifices flexibility in thermal management, dimming architecture, and input voltage headroom (max 60V). | Prefer for space-constrained automotive modules where integration outweighs configurability; not drop-in compatible due to pinout and feature differences. |
Compared with LTC3783EFE#TRPBF and LM34927QMH/NOPB, the LT3763EFE#TRPBF uniquely combines 20A capability, 60V input, triple-input current control (CTRL1/CTRL2/FBIN), and dual current monitoring - making it the only option supporting solar MPPT, thermal foldback, and high-fidelity PWM dimming in a single controller.
Availability
LT3763EFE#TRPBF is available at Aetrix Electronics and suitable for high-power architectural lighting, automotive exterior lighting, and solar-powered strobe applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3763EFE#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 LT3763EFE#TRPBF belongs to Analog Devices' Power by Linear™ LED driver controller family, engineered specifically for high-current, high-voltage LED systems demanding precision current regulation, robust fault handling, and flexible dimming architectures.
FAQ
What is the maximum output current supported by the LT3763EFE#TRPBF?
The LT3763EFE#TRPBF supports regulated output currents up to 20A, achieved through external sense resistor programming and average current mode control. This rating assumes proper thermal management via the exposed pad and adequate PCB copper area. The actual achievable current depends on input voltage, output voltage, ambient temperature, and heatsinking - with thermal shutdown activating at 165°C junction temperature.
How does the LT3763EFE#TRPBF implement thermal derating?
The LT3763EFE#TRPBF implements thermal derating via the CTRL2 pin, which accepts an analog voltage (0–1.5V) to linearly reduce the regulated output current. When CTRL2 voltage falls below CTRL1, it becomes the dominant current setpoint. This allows direct interfacing with NTC thermistors or microcontroller DAC outputs to dynamically scale LED current based on measured temperature, preventing thermal runaway in enclosed fixtures.
Can the LT3763EFE#TRPBF be synchronized to an external clock?
Yes, the LT3763EFE#TRPBF supports external clock synchronization via the SYNC pin. When used, the internal oscillator frequency (set by RT resistor) must be at least 20% lower than the external SYNC pulse frequency to avoid jitter or loss of lock. The SYNC pin has precise thresholds (1.5V falling, 2.175V rising) and is internally pulled down; it must be grounded if unused.
What protection features are built into the LT3763EFE#TRPBF?
The LT3763EFE#TRPBF integrates open-circuit (FB > 1.16V + C/10), short-circuit (FB < 0.25V), overvoltage (FB > 1.515V), overcurrent (SENSE+–SENSE– > 85mV), and thermal shutdown (165°C) protections. All faults pull the FAULT pin low and terminate switching. Hysteresis (40mV for FB comparators, –5°C for thermal) prevents chatter during recovery.
Is the LT3763EFE#TRPBF suitable for solar-powered LED applications?
Yes, the LT3763EFE#TRPBF is explicitly designed for solar-powered LED applications via its FBIN pin, which enables peak input power tracking. When FBIN voltage exceeds 1.206V, output current increases linearly until reaching full scale at 1.26V - allowing the controller to dynamically adjust LED current as solar panel voltage varies, maximizing energy utilization without external MPPT circuitry.
LT3763EFE#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
LT3763EFE#TRPBF FAQ
1.How can I place an order for LT3763EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3763EFE#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 LT3763EFE#TRPBF reliable?
The price and inventory of LT3763EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3763EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3763EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3763EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3763EFE#TRPBF?
LT3763EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3763EFE#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 LT3763EFE#TRPBF?
For technical support, including LT3763EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3763EFE#TRPBF requirements.
6.How does Aetrix verify that LT3763EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3763EFE#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 LT3763EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3763EFE#TRPBF?
All LT3763EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3763EFE#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 LT3763EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3763EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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