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Analog Devices Inc. LT3762EUFD#TRPBF
- Part No.:
- LT3762EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3762EUFD#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,430
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Product details
Overview
LT3762EUFD#TRPBF from Analog Devices is a 28-pin QFN synchronous boost LED controller supporting constant-current (±3.5%) and constant-voltage (±2%) regulation, rail-to-rail current sensing (0V–60V), 100kHz–1MHz programmable switching frequency, and 3000:1 external PWM dimming. It drives high-current LEDs in automotive lighting, industrial signage, and battery-powered LED systems with up to 60V output voltage.
For engineers reviewing the LT3762EUFD#TRPBF datasheet, LT3762EUFD#TRPBF pinout, LT3762EUFD#TRPBF application, or LT3762EUFD#TRPBF equivalent, key selection considerations include its integrated 7.5V INTVCC regulator, PMOS PWM top-gate driver (PWMTG), spread-spectrum modulation (SSFM) for EMI reduction, open/short LED fault flags (OPENLED/SHORTLED), and dual-mode operation in boost, SEPIC, buck, or buck-boost configurations.
Technical Context
The LT3762EUFD#TRPBF implements current-mode control with rail-to-rail ISP–ISN sensing (0V–60V common-mode range) and a transconductance error amplifier (VC pin) for loop stabilization. Its internal oscillator supports frequency programming via RT resistor (90–1240 kHz), while SSFM pin enables triangle-wave-modulated frequency shifting (–30% Δf) to suppress conducted EMI peaks.
It integrates dual gate drivers: BG (low-side N-MOSFET, 230ns min on-time) and TG (high-side synchronous N-MOSFET, 130ns min on-time), plus PWMTG - an inverted, clamped (7V VGS) output for external P-MOSFET disconnect/dimming. The device also features analog dimming via DIM pin (0.4%–97% duty control) and programmable overcurrent protection (600mV ISP–ISN threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 38.5V - supports wide-input battery and industrial supply rails without pre-regulation. |
| Output Voltage | Up to 60V - enables driving long LED strings in automotive headlamps or industrial lighting. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor to balance efficiency, size, and EMI performance. |
| Current Regulation Accuracy | ±3.5% - ensures stable LED brightness across temperature and line variations. |
| INTVCC Regulator | 7.5V ±0.2V - powers internal logic and gate drivers; eliminates need for external bias supply. |
| PWM Dimming Ratio | 3000:1 external, 250:1 internal - meets high-dynamic-range requirements in display backlighting and adaptive lighting. |
| Package | 28-lead QFN (4mm × 5mm, exposed pad) - thermally enhanced for high-power LED driver applications. |
Pinout & Package
LT3762EUFD#TRPBF uses a 28-lead plastic QFN package (4mm × 5mm) with exposed thermal pad soldered to PCB ground. Pin numbering follows top-view UFD package layout (pin 1 at top-left corner, pin 29 = exposed pad = GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal loads and INTVCC regulator; bypassed with ≥1µF low-ESR capacitor. |
| EN/UVLO | Enable/undervoltage lockout | 1.22V falling threshold with programmable hysteresis; disables IC below safe VIN level. |
| ISP / ISN | High-side LED current sense inputs | Rail-to-rail sensing (0V–60V); 600mV overcurrent threshold triggers SHORTLED and shutdown. |
| FB | Voltage feedback input | Regulates to 1.25V; enables CV mode, open-LED detection (VFB – 50mV), and overvoltage protection. |
| PWMTG | P-channel MOSFET gate driver output | Inverted PWM signal with 7V clamp; provides LED disconnect and high-ratio dimming control. |
| RT | Frequency set resistor | Resistor to GND programs switching frequency from 100kHz to 1MHz per datasheet curve. |
| SSFM | Spread-spectrum modulation input | Enables triangle-wave frequency dithering (–30% Δf) to reduce peak EMI emissions. |
| GND / Exposed Pad | Power and signal ground | Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost topology support | Enables >90% efficiency at 60W with reduced conduction loss vs. diode-based designs. |
| Integrated 7.5V INTVCC regulator | Eliminates external bias supply; delivers up to 140mA for gate drivers and logic circuits. |
| Programmable open/short LED protection | OPENLED and SHORTLED flags provide fault reporting with latched status during PWM low periods. |
| Internal PWM dimming generator | Configurable via DIM pin and PWM capacitor; achieves 250:1 dimming without external MCU. |
| Rail-to-rail current sense range | Supports high-side, low-side, or floating sense resistors - simplifies layout in boost, SEPIC, or buck-boost. |
| Thermal shutdown (165°C) | Protects against sustained overload; recovery requires SS pin discharge below 0.2V. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 30V–56V LED arrays in vehicle forward lighting with adaptive beam control. IC Role / Device Role / Timing Role: Constant-current controller with PWM dimming interface and open-circuit LED fault detection. Use Value: Enables 3000:1 dimming ratio and robust fault signaling required for ASIL-B compliant lighting systems. |
Use Scenario: Powering multi-string 48V LED fixtures in warehouse or factory environments with 24V DC input. IC Role / Device Role / Timing Role: Synchronous boost converter with rail-to-rail ISP–ISN sensing and thermal foldback. Use Value: Delivers >90% efficiency at full load and maintains regulation across wide ambient temperature ranges (–40°C to +125°C). |
| Battery-Powered Portable Lighting | LED Signage Power Supply |
Use Scenario: Driving high-brightness LED panels from 3S Li-ion (9V–12.6V) with minimal heat generation. IC Role / Device Role / Timing Role: Programmable-frequency boost controller with soft-start (SS pin) and low-quiescent-current shutdown. Use Value: Extends runtime via 1μA shutdown IQ and reduces EMI with SSFM, easing EMC certification. |
Use Scenario: Constant-voltage power source for RGB LED modules requiring precise 5V/12V/24V outputs with LED current limiting. IC Role / Device Role / Timing Role: Dual-mode controller operating in CV mode (via FB) with overcurrent foldback (via ISP–ISN). Use Value: Eliminates need for separate CV and CC stages; supports flexible string configuration via CTRL1/CTRL2 scaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#TRPBF | Non-synchronous boost controller; no TG driver; max 40V output; no SSFM or PWMTG. | Limited to lower-voltage LED strings; lacks integrated PWM dimming and EMI reduction features. | Choose when cost sensitivity outweighs efficiency and EMI requirements; verify external gate drive needs. |
| LM3423MMX/NOPB | Asynchronous boost LED driver; fixed 500kHz fSW; no programmable dimming; 40V max output. | Designed for simpler, lower-cost LED drivers without fault flag reporting or spread-spectrum capability. | Select only for basic constant-current applications where thermal and EMI margins are generous. |
Compared with LTC3783EFE#TRPBF and LM3423MMX/NOPB, the LT3762EUFD#TRPBF offers higher output voltage (60V), integrated synchronous drivers, programmable dimming, and EMI-reducing SSFM - making it suitable for demanding automotive and industrial LED systems where reliability and spectral compliance are critical.
Availability
LT3762EUFD#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, and battery-powered portable lighting requiring stable component supply, extended temperature operation (–40°C to +125°C), and long-term production continuity.
Supply support for LT3762EUFD#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 (now part of Analog Devices, Inc., following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3762EUFD#TRPBF belongs to Linear's LED controller product line, designed specifically for high-efficiency, fault-resilient LED driving in automotive, industrial, and architectural lighting applications with stringent thermal and EMI requirements.
FAQ
What is the maximum output voltage supported by the LT3762EUFD#TRPBF?
The LT3762EUFD#TRPBF supports synchronous boost output voltages up to 60V, verified across temperature and load conditions per datasheet Section 1. This enables direct driving of long LED strings without cascaded converters. The absolute maximum rating for SW, BOOST, and ISP pins is 60V for nonrepetitive transients (≤1 second), and 38.5V for continuous operation at Tj ≤ 125°C.
Does the LT3762EUFD#TRPBF support both constant-current and constant-voltage regulation modes?
Yes, the LT3762EUFD#TRPBF supports dual regulation: constant-current mode via ISP–ISN sensing (±3.5% accuracy) and constant-voltage mode via FB pin (±2% accuracy). In CV mode, FB regulates to 1.25V and enables open-LED detection (VFB – 50mV) and overvoltage protection (VFB + 65mV), making LT3762EUFD#TRPBF suitable for LED chargers and hybrid power supplies.
How does the SSFM pin reduce EMI in the LT3762EUFD#TRPBF?
The SSFM pin on the LT3762EUFD#TRPBF enables spread-spectrum frequency modulation by generating a triangle ramp that modulates the switching frequency between fSW and fSW – 30%. This dithering spreads energy across a wider bandwidth, reducing peak conducted and radiated EMI. A capacitor from SSFM to GND sets the ramp frequency per the formula 12μA/(2 × 1V × CSSFM).
What is the function of the PWMTG pin on the LT3762EUFD#TRPBF?
The PWMTG pin on the LT3762EUFD#TRPBF is an inverted, clamped (7V VGS) output that drives the gate of an external P-channel MOSFET placed in series with the LED string. It enables LED disconnect during fault conditions and supports 3000:1 external PWM dimming. When PWM is high, PWMTG goes low (VISP – 7V); when PWM is low, PWMTG floats or is pulled high.
Can the LT3762EUFD#TRPBF operate in SEPIC topology?
Yes, the LT3762EUFD#TRPBF supports SEPIC operation using nonsynchronous topologies. By connecting SNSP to the source of the low-side FET and SNSN to ground (per Pin Functions section), the controller senses switch current in SEPIC configurations. Rail-to-rail ISP–ISN sensing (0V–60V) and programmable UVLO ensure stable startup and regulation across varying input and output conditions.
LT3762EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 38.5V
- Voltage - Output:
- 60V
- Current - Output / Channel:
- -
- Frequency:
- 90kHz ~ 1.24MHz
- Dimming:
- Analog, PWM
- Applications:
- Industrial Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT3762EUFD#TRPBF FAQ
1.How can I place an order for LT3762EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3762EUFD#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 LT3762EUFD#TRPBF reliable?
The price and inventory of LT3762EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3762EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3762EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3762EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3762EUFD#TRPBF?
LT3762EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3762EUFD#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 LT3762EUFD#TRPBF?
For technical support, including LT3762EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3762EUFD#TRPBF requirements.
6.How does Aetrix verify that LT3762EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3762EUFD#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 LT3762EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3762EUFD#TRPBF?
All LT3762EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3762EUFD#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 LT3762EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT3762EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3762EUFD#TRPBF Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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