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Analog Devices Inc. LT3762IUFD#TRPBF
- Part No.:
- LT3762IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3762IUFD#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,970
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Product details
Overview
LT3762IUFD#TRPBF from Analog Devices is a 28-lead 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 - deployed in industrial lighting, automotive headlamps, and high-power LED signage.
For engineers reviewing the LT3762IUFD#TRPBF datasheet, LT3762IUFD#TRPBF pinout, LT3762IUFD#TRPBF application, or LT3762IUFD#TRPBF equivalent, key selection considerations include its 60V synchronous boost capability, integrated 7.5V gate driver supply, spread-spectrum EMI reduction, open/short LED fault flags, and dual-mode operation in boost, SEPIC, buck, or buck-boost topologies.
Technical Context
The LT3762IUFD#TRPBF implements current-mode control with a rail-to-rail switch current sense amplifier (0V–60V common-mode range) and a transconductance error amplifier (VC pin) for loop stabilization. Its oscillator supports precise frequency programming via RT resistor (90–1240 kHz) and optional spread-spectrum modulation via SSFM pin to reduce peak EMI.
It integrates dual gate drivers: BG (low-side N-MOSFET) and TG (high-side synchronous N-MOSFET), plus PWMTG (inverted P-MOSFET driver for PWM dimming and output disconnect). The internal 7.5V INTVCC regulator powers gate drivers and control circuitry, eliminating need for external bias supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 38.5V - supports wide-input battery and industrial bus rails without pre-regulation. |
| Output Voltage Capability | Up to 60V - enables driving long LED strings (e.g., 15–20 white LEDs in series) in boost topology. |
| Current Regulation Accuracy | ±3.5% - ensures consistent luminous output across temperature and line variations in lighting systems. |
| Switching Frequency Range | 100kHz to 1MHz - allows trade-off between efficiency (lower fSW), component size (higher fSW), and EMI compliance. |
| PWM Dimming Ratio | 3000:1 external, 250:1 internal - delivers high-fidelity brightness control for architectural and automotive lighting. |
| Current Sense Common-Mode Range | 0V to 60V - supports high-side, low-side, and floating sense configurations in boost, SEPIC, and buck-boost. |
| Integrated Gate Driver Supply | 7.5V ±0.2V regulated INTVCC - powers N-MOSFET drivers without external LDO, reducing BOM count and layout complexity. |
Pinout & Package
LT3762IUFD#TRPBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND), θJA = 43°C/W, θJC = 3.4°C/W. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal loads and INTVCC regulator; bypassed locally with ≥1µF ceramic capacitor. |
| EN/UVLO | Enable and undervoltage lockout | 1.22V falling threshold with programmable hysteresis; disables IC and reduces IQ to 0.1µA when pulled ≤0.4V. |
| ISP / ISN | LED current feedback inputs | Differential pair for constant-current regulation; full-scale threshold = 249mV (±3.5%), C/10 = 25mV for open-LED detection. |
| FB | Voltage feedback input | Regulates to 1.25V ±2%; triggers OPENLED flag if >VFB−50mV and ISP−ISN < 25mV; asserts SHORTLED if <300mV. |
| TG / BG / PWMTG | Synchronous gate drivers | TG drives high-side N-MOSFET; BG drives low-side N-MOSFET; PWMTG drives series P-MOSFET (VGS clamped to 7V). |
| RT / SSFM / SS | Frequency, EMI, and soft-start control | RT sets fSW; SSFM enables spread-spectrum modulation; SS provides soft-start timing and fault timer function. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail current sense (0V–60V) | Enables flexible placement of sense resistor - high-side, low-side, or floating - across boost, SEPIC, buck, and buck-boost topologies. |
| Integrated 7.5V INTVCC regulator | Eliminates external bias supply for gate drivers, reducing component count and improving startup reliability under varying VIN conditions. |
| Programmable 3000:1 external PWM dimming | Supports high-precision brightness control in automotive adaptive driving beams (ADB) and tunable-white lighting without external dimming ICs. |
| Spread-spectrum frequency modulation (SSFM) | Reduces peak EMI by modulating switching frequency up to ±30%, easing compliance with CISPR-25 Class 5 in automotive applications. |
| Open-LED and short-LED fault reporting | Dedicated OPENLED and SHORTLED open-collector flags provide real-time status for system-level fault handling and diagnostics. |
| Internal PWM generator with analog DIM control | Generates 570–1050Hz dimming signal; DIM voltage (0–3V) directly controls duty ratio (0.4%–97%), enabling simple analog interface to microcontrollers. |
Applications
| Automotive Headlamp Drivers | Industrial High-Bay LED Fixtures |
|---|---|
Use Scenario: Driving 40–60W LED arrays in vehicle forward lighting with adaptive beam shaping and dynamic dimming. IC Role / Device Role / Timing Role: Constant-current controller managing synchronous boost stage, PWM dimming interface, and open-circuit LED protection. Use Value: 3000:1 dimming range and 60V output support enable pixel-level beam control; SSFM meets CISPR-25 EMI limits without added shielding. |
Use Scenario: Powering 100–200W LED modules in warehouse and factory lighting with 0–10V or DALI-compatible dimming. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing constant-current regulation, thermal foldback via CTRL pins, and fault-flag reporting to building management systems. Use Value: Rail-to-rail current sensing allows direct high-side sensing on 48V DC distribution buses; ±3.5% current accuracy ensures uniform lumen output across fixtures. |
| Outdoor LED Signage | Medical Surgical Lighting |
Use Scenario: Driving multi-color RGBW LED panels in outdoor digital billboards requiring wide temperature operation and high reliability. IC Role / Device Role / Timing Role: Synchronous boost controller with programmable UVLO, open/short LED detection, and spread-spectrum EMI suppression. Use Value: −40°C to +125°C operating range and robust fault flags ensure continuous operation in uncontrolled environments; 250:1 internal PWM supports smooth color mixing. |
Use Scenario: Precision current regulation for high-CRI, flicker-free surgical lights demanding stable optical output and rapid dimming response. IC Role / Device Role / Timing Role: Constant-current LED driver with fast transient response (via VC compensation), analog dimming interface, and overcurrent shutdown. Use Value: 100kHz–1MHz frequency tuning enables optimal inductor selection for minimal audible noise; ±2% voltage regulation protects auxiliary sensors and optics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3756IUFD#TRPBF | Higher 100V input rating; no integrated INTVCC regulator; requires external 7.5V bias supply. | Better suited for 48V+ industrial or telecom LED systems where higher VIN tolerance is critical. | Select LT3756IUFD#TRPPBF only if input exceeds 38.5V; otherwise LT3762IUFD#TRPBF offers lower BOM cost and simpler layout. |
| LM3423MH/NOPB | Lower 42V max output; no SSFM; 1000:1 PWM dimming; uses external MOSFET drivers instead of integrated TG/BG. | Targeted at cost-sensitive, lower-power (<30W) LED drivers where EMI requirements are less stringent. | Choose LM3423MH/NOPB for sub-30W designs with fixed-frequency operation and no spread-spectrum need; LT3762IUFD#TRPBF preferred for >40W and automotive-grade EMI. |
Compared with LT3756IUFD#TRPBF and LM3423MH/NOPB, the LT3762IUFD#TRPBF uniquely combines integrated 7.5V gate drive, 60V output, 3000:1 dimming, and SSFM in a single 4mm×5mm QFN - delivering higher power density and lower system-level EMI without external bias components.
Availability
LT3762IUFD#TRPBF is available at Aetrix Electronics and suitable for industrial lighting, automotive headlamps, and outdoor signage requiring stable component supply, extended temperature operation (−40°C to +125°C), and long-term production continuity.
Supply support for LT3762IUFD#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 ICs.
The LT3762IUFD#TRPBF belongs to Linear's LED controller product line, engineered specifically for high-efficiency, high-reliability constant-current LED drivers in demanding automotive and industrial environments.
FAQ
What is the maximum output voltage supported by the LT3762IUFD#TRPBF?
The LT3762IUFD#TRPBF supports synchronous boost output voltages up to 60V, enabling it to drive long LED strings (e.g., 15–20 white LEDs in series) while maintaining high efficiency. This rating applies under continuous operation with proper thermal management and appropriate external FET selection. Transient overvoltage tolerance is not specified beyond absolute maximum ratings.
Does the LT3762IUFD#TRPBF support SEPIC topology?
Yes, the LT3762IUFD#TRPBF supports SEPIC topology through its rail-to-rail current sense architecture (0V–60V common-mode range) and independent ISP/ISN inputs. In SEPIC configurations, SNSP and SNSN connect to the switch-side and ground-side terminals of the current sense resistor, respectively, while ISP/ISN monitor LED current. No topology-specific configuration changes are required.
How does the SSFM pin reduce EMI in the LT3762IUFD#TRPBF?
The SSFM pin in the LT3762IUFD#TRPBF enables spread-spectrum frequency modulation by generating a triangle ramp that modulates the switching frequency between fSW and fSW – 30%. This spreads energy across a wider bandwidth, lowering peak radiated and conducted emissions - particularly effective for meeting CISPR-25 Class 5 limits in automotive LED systems without adding ferrite beads or shielding.
What is the purpose of the PWMTG pin on the LT3762IUFD#TRPBF?
The PWMTG pin on the LT3762IUFD#TRPBF is an inverted PWM output designed to drive the gate of an external P-channel MOSFET placed in series with the LED string. It operates between VISP and (VISP – 7V), with internal 7V VGS clamping to protect the PMOS gate oxide. This enables true LED output disconnect during dimming or fault conditions, enhancing safety and system-level control.
Can the LT3762IUFD#TRPBF operate with input voltage below 3V?
Yes, the LT3762IUFD#TRPBF supports minimum input voltage of 2.5V, verified across the full −40°C to +125°C junction temperature range. Operation at 2.5V–3V is confirmed in typical application circuits (e.g., 3V minimum input in 60W boost LED driver reference design), though efficiency and output power capability decrease proportionally with reduced VIN due to duty-cycle constraints.
LT3762IUFD#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)
LT3762IUFD#TRPBF FAQ
1.How can I place an order for LT3762IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3762IUFD#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 LT3762IUFD#TRPBF reliable?
The price and inventory of LT3762IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3762IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3762IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3762IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3762IUFD#TRPBF?
LT3762IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3762IUFD#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 LT3762IUFD#TRPBF?
For technical support, including LT3762IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3762IUFD#TRPBF requirements.
6.How does Aetrix verify that LT3762IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3762IUFD#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 LT3762IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3762IUFD#TRPBF?
All LT3762IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3762IUFD#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 LT3762IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT3762IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3762IUFD#TRPBF Tags
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BCR402RE6327HTSA1
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BCR420UE6433HTMA1
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UFD-7
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