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Analog Devices Inc. LT3763IFE#PBF
- Part No.:
- LT3763IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3763IFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,775
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Product details
Overview
LT3763IFE#PBF from Analog Devices is a 60V, synchronous step-down LED driver controller with average current mode control, designed to regulate output currents up to 20A across 0V–55V output voltage range. It features dual analog current control (CTRL1/CTRL2), input/output current sensing, ±6% current regulation accuracy, and integrated PWM dimming driver-used in high-power architectural lighting systems requiring precise thermal and fault management.
For engineers reviewing the LT3763IFE#PBF datasheet, LT3763IFE#PBF pinout, LT3763IFE#PBF application, or LT3763IFE#PBF equivalent, key selection considerations include its 28-lead TSSOP thermally enhanced package, 200kHz–1MHz programmable switching frequency, 6V–60V input range, and support for true-color 3000:1 PWM dimming in LED driver designs.
Technical Context
The LT3763IFE#PBF 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 (0V–55V) while FB pin reference is fixed at 1.206V with ±1.5% accuracy and overvoltage lockout at 1.515V.
Input and output current monitoring are implemented via dedicated differential sense amplifiers (IVINP/IVINN and SENSE+/SENSE–), each delivering buffered outputs (IVINMON, ISMON) scaled at 20× sense voltage. The device integrates thermal shutdown (165°C trip, –5°C hysteresis), C/10 open-circuit detection, and cycle-by-cycle overcurrent protection triggered at 85mV across SENSE+–SENSE–.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports wide-input industrial and automotive LED power 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% - enables tight output voltage control for multi-string LED configurations with shared cathode/anode. |
| Switching Frequency Range | 200kHz to 1MHz - allows optimization of efficiency vs. EMI and inductor size in space-constrained designs. |
| Shutdown Current | <2µA - minimizes standby power loss in battery-backed or solar-powered lighting systems. |
| Thermal Shutdown Threshold | 165°C with –5°C hysteresis - provides robust thermal protection during overload or poor heatsinking conditions. |
| PWM Dimming Ratio | 3000:1 True Color PWM™ - preserves color fidelity across full dimming range without flicker or color shift. |
Pinout & Package
LT3763IFE#PBF 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 MOSFET gate driver output | Drives external NMOS with 2.2Ω pull-up / 1Ω pull-down; must not be externally forced. |
| INTVCC (Pin 2) | Internal 5V regulator output | Supplies internal circuitry and BOOST capacitor charging; requires ≥22µF bypass to GND. |
| VIN (Pin 3) | Main input supply rail | Accepts 6V–60V; must be bypassed locally with ≥4.7µF low-ESR capacitor near exposed pad. |
| EN/UVLO (Pin 4) | Enable and undervoltage lockout input | Turns on core at 1.705V, shuts down fully below 0.5V; 185mV hysteresis built-in. |
| VREF (Pin 5) | Buffered 2.0V reference output | Drives CTRL1/CTRL2 dividers; max 0.5mA load; requires ≥1µF bypass to GND. |
| IVINN / IVINP (Pins 6–7) | Differential inputs for input current sense | Measure voltage drop across high-side sense resistor; common-mode range up to VIN – 1.4V. |
| FAULT (Pin 9) | Open/short/C/10 fault indicator | Active-low open-drain output pulled down for FB < 0.25V (short) or > 1.16V + C/10 (open). |
| FB (Pin 11) | Voltage regulation feedback input | Regulates output to 1.206V reference; triggers OVP at 1.515V, halting switching. |
| CTRL1 / CTRL2 (Pins 13–14) | Analog current set inputs | Lower voltage determines regulated output current; clamped at 1.5V max; 0–1.5V → 0–51mV sense range. |
| SENSE+ / SENSE– (Pins 16–17) | Differential inputs for output current sense | Measure LED string current via external shunt; 50mV typical full-scale; 85mV triggers OCP. |
| PWM (Pin 22) | PWM dimming enable input | High > 2.175V enables switching; low < 1.5V terminates all switching and pulls PWM_OUT low. |
| PWM_OUT (Pin 24) | External PWM FET driver | Drives external MOSFET for high-side PWM dimming; 2.2Ω pull-up / 0.9Ω pull-down. |
| TG (Pin 25) | High-side MOSFET gate driver output | Drives external NMOS with 2.2Ω pull-up / 1.3Ω pull-down; floating 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 boost for TG driver; requires Schottky diode from INTVCC to BOOST. |
| RT (Pin 20) | Frequency programming input | Resistor to GND sets fSW; 40kΩ → ~1MHz, 221kΩ → ~200kHz; max 55µA sink. |
Key Features
| Feature | Design Value |
|---|---|
| Input & Output Current Monitoring | IVINMON and ISMON provide buffered 20× scaled outputs (0–1V = 0–50mV sense) for real-time power analysis and closed-loop control. |
| Peak Power Tracking via FBIN | Enables solar charger applications by dynamically adjusting LED current based on input voltage-active when FBIN > 1.206V. |
| Accurate Thermal Derating Control | CTRL2 accepts analog voltage to linearly reduce regulated output current before thermal shutdown occurs at 165°C. |
| Integrated Fault Detection Suite | Detects open (C/10 + FB > 1.16V), short (FB < 0.25V), and overvoltage (FB > 1.515V) conditions with dedicated FAULT pin and hysteresis. |
| Programmable Soft-Start | SS pin accepts external capacitor charged at 11µA; overrides CTRL1/CTRL2 during startup to prevent inrush current overshoot. |
Applications
| High-Power Architectural Lighting | Automotive Exterior Lighting |
|---|---|
Use Scenario: Multi-string LED luminaires for commercial building façades requiring uniform brightness, thermal stability, and DALI-compatible dimming. IC Role / Device Role / Timing Role: Primary current-regulated DC/DC controller managing up to 20A total LED load with synchronized PWM dimming and input current limiting. Use Value: Enables 3000:1 True Color PWM™ dimming without color shift while maintaining ±6% current accuracy across ambient temperatures from –40°C to 125°C. | Use Scenario: Adaptive front-lighting systems (AFS) and dynamic turn signals in passenger vehicles operating from 9V–16V battery with load dump immunity. IC Role / Device Role / Timing Role: High-reliability LED driver controller with input overvoltage protection, C/10 open-wire detection, and EN/UVLO hysteresis for cold-crank operation. Use Value: Delivers 6V–60V input tolerance and 165°C thermal shutdown to survive automotive transients and ensure fail-safe LED operation under fault conditions. |
| Aviation & Marine Strobe Lights | Solar-Powered LED Lighting |
Use Scenario: High-intensity anti-collision strobes on aircraft and marine vessels requiring precise flash timing, high peak current, and extended service life. IC Role / Device Role / Timing Role: Constant-current pulse controller using PWM_OUT to drive external MOSFETs for microsecond-accurate strobe timing and current shaping. Use Value: Achieves sub-10ns PWM propagation delay and cycle-by-cycle overcurrent limiting to sustain 20A peak pulses without thermal runaway. | Use Scenario: Off-grid solar streetlights with MPPT-like input voltage tracking to maximize energy harvest under variable irradiance and battery state. IC Role / Device Role / Timing Role: Input-voltage-responsive LED driver leveraging FBIN pin to modulate output current proportional to solar panel voltage. Use Value: Maintains optimal LED power delivery across 12V–48V PV input range while preventing overcharging via integrated input current limit and fault detection. |
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 |
|---|---|---|---|
| LTC3783EFE#PBF | Fixed 500kHz fSW, no RT/SYNC, lower max IOUT (15A), no FBIN pin | Lacks peak power tracking and programmable frequency; suited for simpler, cost-sensitive LED drivers | Select when design does not require solar tracking or frequency synchronization and output current ≤15A. |
| LM3423MH/NOPB | Asynchronous buck controller, 60V rating, no input current monitor, no PWM_OUT driver | No integrated PWM dimming driver or IVINMON/ISMON outputs; requires external FET and monitoring circuitry | Choose when system already includes discrete PWM switching and current sensing, and board space permits added components. |
Compared with LTC3783EFE#PBF and LM3423MH/NOPB, the LT3763IFE#PBF uniquely combines 20A capability, dual current control (CTRL1/CTRL2), FBIN-based peak power tracking, and integrated PWM_OUT driver-making it optimal for thermally demanding, solar-aware, or high-fidelity dimming applications where feature integration reduces BOM count and improves reliability.
Availability
LT3763IFE#PBF is available at Aetrix Electronics and suitable for high-power architectural lighting, automotive exterior lighting, and solar-powered LED systems requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade performance.
Supply support for LT3763IFE#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 precision instrumentation, industrial automation, and power management markets.
The LT3763IFE#PBF belongs to Analog Devices' high-current LED driver controller product line, engineered specifically for thermally robust, high-accuracy constant-current regulation in demanding lighting applications from automotive to renewable energy.
FAQ
What is the maximum output current supported by the LT3763IFE#PBF?
The LT3763IFE#PBF supports regulated output currents up to 20A, achieved through external sense resistor configuration and average current mode control. Its ±6% current regulation accuracy holds across the full operating junction temperature range (–40°C to 125°C), and thermal derating via CTRL2 allows safe operation under elevated ambient conditions. The LT3763IFE#PBF achieves this using dual N-channel MOSFET gate drivers (TG/BG) and integrated current sensing with cycle-by-cycle overcurrent protection.
How does the FBIN pin function in the LT3763IFE#PBF?
The FBIN pin in the LT3763IFE#PBF enables peak power tracking for solar-powered applications by dynamically adjusting output current based on input voltage. When FBIN rises above 1.206V, the LT3763IFE#PBF linearly increases regulated current until FBIN reaches 1.26V, at which point full current is delivered. If unused, FBIN must be tied to VREF (2.0V) to avoid unintended regulation behavior. This feature is absent in most competing controllers and is critical for maximizing energy harvest in off-grid LED lighting.
Can the LT3763IFE#PBF synchronize to an external clock signal?
Yes, the LT3763IFE#PBF supports frequency synchronization via the SYNC pin, which accepts external clock signals with precise rising (2.175V) and falling (1.5V) thresholds. To avoid beat frequencies, the internal RT-set frequency must be at least 20% lower than the SYNC signal frequency. This capability allows the LT3763IFE#PBF to align switching with system-level clocks or reduce EMI in noise-sensitive environments-unlike fixed-frequency alternatives such as the LTC3783EFE#PBF.
What fault conditions does the FAULT pin of the LT3763IFE#PBF detect?
The FAULT pin of the LT3763IFE#PBF detects three distinct failure modes: open-circuit (FB > 1.16V + inductor current < C/10), short-circuit (FB < 0.25V), and overvoltage (FB > 1.515V). It asserts low via open-drain output with 50mV hysteresis to prevent chatter during recovery. The LT3763IFE#PBF also disables the low-side MOSFET during C/10 events regardless of FB voltage-providing robust protection not found in basic LED drivers like the LM3423MH/NOPB.
Does the LT3763IFE#PBF support true-color PWM dimming?
Yes, the LT3763IFE#PBF supports 3000:1 True Color PWM™ dimming through its dedicated PWM pin and integrated PWM_OUT driver. When PWM is asserted high (>2.175V), the LT3763IFE#PBF enables switching and drives PWM_OUT high to control external FETs; when PWM goes low (<1.5V), all switching halts and PWM_OUT is pulled low. This architecture eliminates color shift and flicker across the full dimming range-critical for architectural and display lighting where spectral consistency is mandatory.
LT3763IFE#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
LT3763IFE#PBF FAQ
1.How can I place an order for LT3763IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3763IFE#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 LT3763IFE#PBF reliable?
The price and inventory of LT3763IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3763IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3763IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3763IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3763IFE#PBF?
LT3763IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3763IFE#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 LT3763IFE#PBF?
For technical support, including LT3763IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3763IFE#PBF requirements.
6.How does Aetrix verify that LT3763IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3763IFE#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 LT3763IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3763IFE#PBF?
All LT3763IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3763IFE#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 LT3763IFE#PBF part is unused and in its original packaging.
Return procedure for LT3763IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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