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Analog Devices Inc. LT3762EFE#TRPBF
- Part No.:
- LT3762EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3762EFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,868
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Product details
Overview
LT3762EFE#TRPBF from Analog Devices is a 28-lead TSSOP 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 systems requiring high-efficiency, high-voltage LED drive with open/short LED protection.
For engineers reviewing the LT3762EFE#TRPBF datasheet, LT3762EFE#TRPBF pinout, LT3762EFE#TRPBF application, or LT3762EFE#TRPBF equivalent, key selection considerations include its synchronous boost topology support up to 60V output, integrated 7.5V INTVCC regulator for N-MOSFET gate drives, PMOS PWM disconnect capability, spread-spectrum EMI reduction via SSFM pin, and dual-mode dimming (internal 250:1 PWM + analog).
Technical Context
The LT3762EFE#TRPBF implements current-mode control with rail-to-rail ISP/ISN sensing input range (0V–60V) and programmable full-scale threshold (249mV typ at CTRL ≥ 1.2V). Its oscillator uses an external RT resistor to set switching frequency from 100kHz to 1MHz, while SSFM pin enables triangle-wave-modulated frequency dithering for EMI reduction.
It integrates dual gate drivers: BG (low-side N-MOSFET, 230ns min on-time) and TG (synchronous high-side N-MOSFET, 130ns min on-time), plus PWMTG (inverted P-MOSFET driver with 7V VGS clamp). The VC error amplifier output supports loop compensation with RC network, and FB pin enables both CV regulation and open/short LED fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 38.5V - supports wide-input industrial power rails including 12V/24V battery and regulated DC supplies. |
| Max Output Voltage | 60V - enables driving long LED strings (e.g., 15–20 white LEDs) in boost configuration without cascading stages. |
| Current Regulation Accuracy | ±3.5% - ensures stable LED brightness across temperature and line variations in precision lighting applications. |
| Switching Frequency Range | 100kHz to 1MHz - allows optimization of inductor size, efficiency, and EMI performance per design constraints. |
| Dimming Ratio | 3000:1 external PWM - delivers deep, flicker-free dimming essential for architectural and automotive interior lighting. |
| INTVCC Regulator | 7.5V ±0.2V - powers internal logic and N-MOSFET gate drivers without external bias supply, simplifying BOM. |
| Operating Temp Range | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
LT3762EFE#TRPBF is housed in a 28-lead plastic TSSOP package (FE) with exposed pad (Pin 29) soldered to PCB ground for thermal management (θJA = 30°C/W). Pin functions are validated per Analog Devices' official datasheet Rev 0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 15, 29) | Power and signal reference ground | Three dedicated GND pins + exposed pad ensure low-impedance return path for high di/dt switching currents and thermal dissipation. |
| BG / TG / SW | N-MOSFET gate drivers and switch node | BG drives low-side FET; TG drives synchronous high-side FET; SW is shared return path - enables efficient synchronous boost operation. |
| ISP / ISN | High-side LED current sense inputs | Rail-to-rail sensing (0V–60V) enables direct connection across sense resistor in high-side or low-side configurations (e.g., SEPIC, buck-boost). |
| PWMTG | Inverted P-MOSFET gate driver output | Drives series PMOS between VISP and (VISP – 7V); 7V clamp protects gate oxide - enables LED string disconnect and overcurrent shutdown. |
| FB | Voltage feedback and fault detection input | Regulates to 1.25V; triggers OPENLED flag if > (VFB – 50mV) and ILED < C/10; asserts SHORTLED if < 300mV - provides dual-fault protection without external comparators. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost + SEPIC/buck/buck-boost topology support | Enables single-controller flexibility across multiple LED driver architectures - reduces design reuse effort and inventory SKUs. |
| Integrated 7.5V INTVCC regulator | Eliminates need for external bias supply; powers gate drivers and internal logic - lowers system cost and improves startup reliability. |
| Programmable 100kHz–1MHz switching frequency | Allows trade-off between inductor size (higher fSW) and conduction loss (lower fSW) - adapts to mechanical layout and thermal constraints. |
| Spread-spectrum modulation (SSFM) | Reduces peak EMI by modulating fSW ±15% - helps meet CISPR-25 Class 5 and FCC Part 15B without added shielding or filtering. |
| 3000:1 external PWM dimming + 250:1 internal PWM | Supports both microcontroller-driven dimming and self-contained analog dimming - simplifies system-level control architecture. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 48V LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping and thermal derating. IC Role / Device Role / Timing Role: Constant-current controller managing boost stage, PWM dimming interface, and open-circuit LED fault reporting via OPENLED/SHORTLED flags. Use Value: ±3.5% current accuracy maintains consistent lumen output across vehicle battery voltage swings (9V–16V) and ambient temperatures (–40°C to +125°C). | Use Scenario: Powering 100W+ LED fixtures in warehouse ceilings using 24VDC or 48VDC distributed power buses. IC Role / Device Role / Timing Role: Synchronous boost controller with rail-to-rail ISP/ISN sensing enabling high-side current monitoring and robust short-circuit protection. Use Value: 60V max output supports long LED strings without intermediate converters; SSFM reduces conducted EMI in dense electrical environments. |
| UV-C Disinfection Module | Outdoor Streetlight Power Supply |
Use Scenario: Driving high-voltage UV-C LED arrays (36–50V forward) requiring precise current control and thermal foldback. IC Role / Device Role / Timing Role: Constant-current regulator with analog dimming (DIM pin) and programmable undervoltage lockout (EN/UVLO) for safe cold-start behavior. Use Value: Internal PWM dimming (250:1) enables intensity ramping during exposure cycles; C/10 open-LED detection prevents false faults during pulsed operation. | Use Scenario: Solar-powered streetlights with wide-input (12V–36V) battery banks and high-output LED loads requiring long lifetime and fault resilience. IC Role / Device Role / Timing Role: Dual-mode controller operating in constant-current mode for LED regulation and constant-voltage mode for battery charging supervision via FB pin. Use Value: FB pin's dual function enables unified control of LED current and battery voltage limits - reducing component count in hybrid lighting/charging systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#TRPBF | 4-switch synchronous buck-boost controller; no integrated LED-specific protections (OPENLED/SHORTLED); requires external current sense amp. | Designed for wide-VIN DC/DC conversion, not optimized for LED current regulation or dimming interfaces. | Select only when topology requires buck-boost and LED-specific features are implemented externally. |
| LM3409QMY/NOPB | Asynchronous boost LED controller; no synchronous TG driver; max 40V output; no SSFM or internal PWM generator. | Lower-cost solution for non-critical lighting where EMI and dimming depth are less constrained. | Choose for cost-sensitive, lower-power (<30W) designs where 3000:1 dimming and 60V output are unnecessary. |
Compared with LTC3789EMSE#TRPBF and LM3409QMY/NOPB, the LT3762EFE#TRPBF uniquely integrates LED-specific protections, dual dimming modes, and synchronous boost capability - making it optimal for high-reliability, high-performance LED driver designs requiring minimal external components.
Availability
LT3762EFE#TRPBF is available at Aetrix Electronics and suitable for industrial lighting, automotive exterior lighting, and UV-C disinfection systems requiring stable component supply, extended temperature operation, and long-term production continuity.
Supply support for LT3762EFE#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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and connectivity applications.
The LT3762 product line was designed specifically for high-efficiency, high-voltage LED driver applications - emphasizing accurate constant-current regulation, robust fault protection, and flexible topology support (boost, SEPIC, buck, buck-boost) in harsh environments.
FAQ
What is the maximum output voltage supported by the LT3762EFE#TRPBF?
The LT3762EFE#TRPBF supports a synchronous boost output voltage up to 60V. This is achieved through rail-to-rail ISP/ISN current sense inputs (0V–60V common-mode range) and internal protection circuitry that monitors VISP–ISN thresholds up to 600mV. The 60V rating applies to continuous operation at TJ ≤ 125°C per datasheet Absolute Maximum Ratings.
Does the LT3762EFE#TRPBF support both constant-current and constant-voltage regulation?
Yes, the LT3762EFE#TRPBF supports both modes. It regulates LED current via ISP/ISN sensing with ±3.5% accuracy and regulates output voltage via the FB pin with ±2% accuracy. The FB pin serves dual roles: voltage feedback for CV mode and open/short LED fault detection - enabling use in LED drivers and current-limited voltage supplies.
How does the LT3762EFE#TRPBF implement PWM dimming?
The LT3762EFE#TRPBF supports two independent PWM dimming methods: external 3000:1 digital PWM applied to the PWM pin, and internal 250:1 PWM generated using a capacitor on the PWM pin and controlled by the DIM voltage (570Hz–1050Hz). The internal generator's duty ratio scales from 0.4% to 97% based on DIM voltage, as verified in the Typical Performance Characteristics (Figure G20).
What package type and thermal characteristics apply to the LT3762EFE#TRPBF?
The LT3762EFE#TRPBF uses a 28-lead plastic TSSOP package (FE) with exposed pad (Pin 29) soldered to PCB ground. Its thermal resistance is θJA = 30°C/W and θJC = 10°C/W. The exposed pad must be soldered to maximize heat transfer - critical for maintaining junction temperature within the –40°C to +125°C operating range during 60W operation.
Can the LT3762EFE#TRPBF be used in SEPIC or buck configurations?
Yes, the LT3762EFE#TRPBF explicitly supports SEPIC and buck topologies per datasheet Applications section and Block Diagram. Its rail-to-rail ISP/ISN inputs allow high-side or low-side current sensing, and the synchronous gate drivers (BG/TG) can be configured for nonsynchronous operation (e.g., disabling TG). Application circuits for SEPIC and buck modes are provided in the datasheet Figures TA01a and TA02.
LT3762EFE#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:
- 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-TSSOP-EP
LT3762EFE#TRPBF FAQ
1.How can I place an order for LT3762EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3762EFE#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 LT3762EFE#TRPBF reliable?
The price and inventory of LT3762EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3762EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3762EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3762EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3762EFE#TRPBF?
LT3762EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3762EFE#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 LT3762EFE#TRPBF?
For technical support, including LT3762EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3762EFE#TRPBF requirements.
6.How does Aetrix verify that LT3762EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3762EFE#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 LT3762EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3762EFE#TRPBF?
All LT3762EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3762EFE#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 LT3762EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3762EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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