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Analog Devices Inc. LT3763HFE#TRPBF
- Part No.:
- LT3763HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3763HFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,717
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Product details
Overview
LT3763HFE#TRPBF from Analog Devices is a 60V, 20A synchronous step-down LED driver controller with average current mode control, ±6% current regulation accuracy, 200kHz–1MHz programmable switching frequency, and integrated input/output current monitoring. It regulates LED current up to 20A in high-power architectural and automotive lighting systems.
For engineers reviewing the LT3763HFE#TRPBF datasheet, LT3763HFE#TRPBF pinout, LT3763HFE#TRPBF application, or LT3763HFE#TRPBF equivalent, key selection considerations include thermal grade (–40°C to 150°C), 28-lead TSSOP package with exposed pad, dual analog current control (CTRL1/CTRL2), and fault detection for open/short/C/10 LED conditions.
Technical Context
The LT3763HFE#TRPBF implements fixed-frequency average current mode control with independent voltage regulation loop (FB pin, 1.206V reference) and overvoltage lockout at 1.515V. It supports three current-setting inputs: CTRL1 (0–1.5V, primary current setpoint), CTRL2 (thermal derating input), and FBIN (peak power tracking for solar applications).
Input and output current sensing are implemented via dedicated differential amplifiers (IVINP/IVINN and SENSE+/SENSE–), each delivering buffered monitor outputs (IVINMON, ISMON) scaled at 20× sense voltage. The device integrates NMOS gate drivers (TG/BG) with non-overlap timing (42–44ns), soft-start (11µA ramp), and PWM dimming interface (PWM/PWM_OUT pins).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current Range | Up to 20A regulated LED current; set by external sense resistor and CTRL1 voltage (0–1.5V) |
| Input Voltage Range | 6V to 60V; supports wide-range DC sources including automotive battery, solar arrays, and industrial supplies |
| Current Regulation Accuracy | ±6% over temperature and line; enables precise brightness control in high-reliability lighting |
| Switching Frequency | 200kHz to 1MHz; set by RT resistor or synchronized via SYNC pin for EMI reduction |
| Thermal Rating | Junction temperature range –40°C to 150°C (H-grade); validated for under-hood automotive and high-ambient lighting |
| Shutdown Current | <2µA at EN/UVLO <0.5V; enables ultra-low-power standby in battery-backed systems |
| Fault Detection | Dual-comparator FAULT pin detects open LED (FB >1.16V + C/10), short LED (FB <0.25V), and overvoltage (FB >1.515V) |
Pinout & Package
LT3763HFE#TRPBF uses a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed pad (Pin 29) soldered to PCB for thermal management. θJA = 30°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG (Pin 1) | Low-side FET gate driver output | Drives external NMOS with 2.2Ω pull-up / 1Ω pull-down; non-overlapping timing prevents shoot-through |
| CTRL1 (Pin 14) | Analog current setpoint input | 0–1.5V input sets regulated output current; clamped at 1.5V; determines reference current via internal 90kΩ resistor |
| SENSE+ / SENSE– (Pins 17/16) | LED current sense differential inputs | Measure voltage across external sense resistor; error amplifier compares to internal reference (51mV typ) for current regulation |
| FB (Pin 11) | Voltage regulation feedback input | Regulates output voltage to 1.206V reference; triggers overvoltage shutdown at 1.515V |
| FAULT (Pin 9) | Open/short/C/10 fault indicator | Active-low open-drain output pulled down on FB <0.25V (short), FB >1.16V + low current (open), or overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Triple-input current control | Simultaneous use of CTRL1 (primary setpoint), CTRL2 (thermal derating), and FBIN (input-voltage tracking) enables adaptive LED current management |
| Integrated current monitors | IVINMON and ISMON provide buffered 0–1V outputs proportional to input/output current (20× sense voltage), eliminating need for external amplifiers |
| Programmable UVLO with hysteresis | EN/UVLO pin offers 185mV built-in hysteresis and 5µA current source for custom threshold setting-critical for stable startup in noisy automotive environments |
| PWM dimming interface | PWM pin accepts 1.5V/2.175V thresholds; PWM_OUT drives external FET with 2.2Ω/0.9Ω drive strength for true-color 3000:1 dimming |
| Robust protection suite | Cycle-by-cycle overcurrent limit (85mV sense threshold), thermal shutdown (165°C trip), and fault latching ensure reliability in high-power LED systems |
Applications
| High-Power Architectural Lighting | Automotive Exterior Lighting |
|---|---|
Use Scenario: Constant-current driving of multi-string high-brightness LED arrays in façade and tunnel lighting, operating from 24V–48V DC distribution rails. IC Role / Device Role / Timing Role: Primary current-regulating controller implementing average current mode control with voltage foldback to prevent overvoltage during open-circuit faults. Use Value: ±6% current accuracy ensures consistent lumen output across strings; integrated IVINMON/ISMON enable real-time power telemetry without added components. | Use Scenario: Headlamp and DRL modules requiring robust operation at 12V/24V battery voltages with thermal derating and fault reporting for ASIL-B compliance. IC Role / Device Role / Timing Role: Synchronous buck controller with CTRL2-based thermal derating and FAULT pin reporting for open/short LED diagnostics per UNECE R149. Use Value: H-grade (–40°C to 150°C) operation eliminates derating at under-hood temperatures; EN/UVLO hysteresis prevents flicker during cold cranking. |
| Solar-Powered LED Lighting | Aviation & Marine Strobe Lights |
Use Scenario: Off-grid LED lighting powered by MPPT-charged batteries or direct PV input, requiring peak power point tracking and wide input voltage range. IC Role / Device Role / Timing Role: Input-voltage regulated current source using FBIN pin to dynamically adjust LED current as input voltage varies from 6V to 60V. Use Value: FBIN functionality maintains constant LED power across solar array voltage swing; 60V max VIN supports unregulated PV string inputs. | Use Scenario: High-intensity strobe lights in aircraft beacons and marine navigation lamps, demanding fast transient response, fault tolerance, and wide ambient temperature operation. IC Role / Device Role / Timing Role: High-current pulse controller with C/10 fault detection and thermal shutdown to protect LEDs during rapid duty-cycle changes. Use Value: 20A capability enables single-chip drive of high-luminance strobes; FAULT pin provides fail-safe open-circuit indication required for airworthiness certification. |
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; lower max input voltage (40V); ±10% current accuracy | Lacks input-voltage tracking and thermal derating (no CTRL2); unsuitable for solar or high-temp automotive | Select only for cost-sensitive, lower-power (<10A), fixed-frequency designs where thermal adaptation is not required. |
| LM3410XSDX/NOPB | Monolithic 1.5A buck LED driver; integrated power MOSFETs; no current monitoring outputs; 32V max VIN | Not scalable to 20A; lacks IVINMON/ISMON, FBIN, or CTRL2; limited to low-power portable lighting | Use only for compact, low-current (<2A), space-constrained applications where external FETs and telemetry are unnecessary. |
Compared with LTC3783EFE#TRPBF and LM3410XSDX/NOPB, the LT3763HFE#TRPBF uniquely delivers 20A current capability with H-grade thermal rating, triple-input current control (CTRL1/CTRL2/FBIN), and integrated current monitoring-making it the only option qualified for high-power, thermally demanding, and adaptive LED systems.
Availability
LT3763HFE#TRPBF is available at Aetrix Electronics and suitable for high-power architectural lighting, automotive exterior lighting, and solar-powered LED systems requiring stable component supply and long-term industrial availability.
Supply support for LT3763HFE#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 LT3763 product line is designed specifically for high-current, high-reliability LED driver applications requiring precision current regulation, wide input voltage range, and comprehensive fault protection-targeting architectural, automotive, and aerospace lighting systems.
FAQ
What is the maximum junction temperature rating for the LT3763HFE#TRPBF?
The LT3763HFE#TRPBF is rated for operation from –40°C to 150°C junction temperature, distinguishing it from the E-grade (–40°C to 125°C) and I-grade (–40°C to 125°C) variants. This H-grade thermal specification enables reliable deployment in under-hood automotive lighting and high-ambient industrial environments where sustained 150°C operation is required. The LT3763HFE#TRPBF incorporates thermal shutdown at 165°C with –5°C hysteresis to protect against catastrophic overheating.
How does the FBIN pin function in the LT3763HFE#TRPBF?
The FBIN pin in the LT3763HFE#TRPBF enables peak input power tracking by modulating LED current based on input voltage-critical for solar-powered LED systems. When FBIN rises above 1.206V, the controller linearly increases regulated current up to the maximum set by CTRL1/CTRL2, reaching full scale at 1.26V. If unused, FBIN must be tied to VREF (2V) to disable this function and allow standard CTRL1-based current regulation. The LT3763HFE#TRPBF's FBIN circuitry is internally calibrated and requires no external compensation.
Can the LT3763HFE#TRPBF be synchronized to an external clock?
Yes, the LT3763HFE#TRPBF supports external clock synchronization via the SYNC pin, which accepts TTL/CMOS-compatible signals with precise 1.5V (falling) and 2.175V (rising) thresholds. To avoid beat frequencies, the internal oscillator (set by RT resistor) must operate at least 20% slower than the external SYNC frequency. The SYNC function allows multiple LT3763HFE#TRPBF units to operate in phase-reducing input ripple and EMI in multi-channel LED systems. The LT3763HFE#TRPBF disables internal oscillator when SYNC is active.
What protection features are integrated into the LT3763HFE#TRPBF?
The LT3763HFE#TRPBF integrates six core protections: (1) cycle-by-cycle overcurrent limit (85mV SENSE+–SENSE– threshold), (2) overvoltage lockout (1.515V FB threshold), (3) open/short LED detection via FAULT pin (FB <0.25V or FB >1.16V + C/10), (4) thermal shutdown (165°C trip), (5) input undervoltage lockout with programmable hysteresis (EN/UVLO pin), and (6) input current limiting (50mV IVINP–IVINN threshold). All protections are hardware-based and operate independently of microcontroller supervision, ensuring fail-safe operation in the LT3763HFE#TRPBF.
How is output current set on the LT3763HFE#TRPBF?
Output current on the LT3763HFE#TRPBF is set by the lower of two analog control voltages-CTRL1 (0–1.5V) or CTRL2 (0–1.5V)-applied to dedicated pins. The selected voltage develops a reference current across an internal 90kΩ resistor, which generates a corresponding reference voltage for the current-mode error amplifier. This results in a regulated sense voltage of 51mV (typ) across the external SENSE+ and SENSE– pins. For example, with a 2.5mΩ sense resistor, 1.5V on CTRL1 yields 20A output current per the formula IOUT = VCTRL/(30 × RS). The LT3763HFE#TRPBF enforces strict 1.5V clamping on both CTRL pins to prevent overrange operation.
LT3763HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3763HFE#TRPBF FAQ
1.How can I place an order for LT3763HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3763HFE#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 LT3763HFE#TRPBF reliable?
The price and inventory of LT3763HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3763HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3763HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3763HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3763HFE#TRPBF?
LT3763HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3763HFE#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 LT3763HFE#TRPBF?
For technical support, including LT3763HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3763HFE#TRPBF requirements.
6.How does Aetrix verify that LT3763HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3763HFE#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 LT3763HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3763HFE#TRPBF?
All LT3763HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3763HFE#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 LT3763HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3763HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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