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Analog Devices Inc. LT3762HFE#PBF
- Part No.:
- LT3762HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3762HFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:288
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Product details
Overview
LT3762HFE#PBF from Analog Devices is a high-temperature-rated synchronous boost LED controller designed for constant-current and constant-voltage regulation in automotive and industrial lighting. It delivers 60V output, supports 2.5V–38.5V input, enables 3000:1 external PWM dimming, integrates spread-spectrum EMI reduction, and features rail-to-rail current sensing (0V–60V) with ±3.5% current accuracy.
For engineers reviewing the LT3762HFE#PBF datasheet, LT3762HFE#PBF pinout, LT3762HFE#PBF application, or LT3762HFE#PBF equivalent, key selection criteria include its –40°C to +150°C junction temperature rating, synchronous gate drivers (BG/TG/PWMTG), programmable 100kHz–1MHz switching frequency via RT pin, integrated 7.5V INTVCC supply, and dual protection flags (OPENLED/SHORTLED).
Technical Context
The LT3762HFE#PBF implements current-mode control with a 28-pin TSSOP package and operates across –40°C to +150°C. Its architecture includes a transconductance error amplifier (VC), rail-to-rail ISP/ISN current sense inputs (0V–60V common-mode), and dual feedback paths: FB for voltage regulation/open-LED detection and CTRL1/CTRL2 for programmable current threshold scaling.
It integrates synchronous N-channel MOSFET drivers (BG, TG), a P-channel PWM top-gate driver (PWMTG), auxiliary bias circuitry (AUXSW1/AUXSW2/AUXBST), and fault logic that asserts OPENLED when FB > VFB–50mV and VISP–ISN < 25mV, or SHORTLED when FB < 300mV or VISP–ISN > 600mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +150°C junction temperature - qualified for under-hood automotive and high-ambient industrial LED drivers. |
| Input Voltage Range | 2.5V to 38.5V - supports wide-range battery input including 12V/24V automotive systems with cold-crank tolerance. |
| Output Voltage Capability | Up to 60V - enables driving long LED strings in boost, SEPIC, buck-boost, or buck configurations. |
| Current Regulation Accuracy | ±3.5% - ensures stable LED brightness across temperature and line/load variations without external calibration. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor to optimize efficiency, magnetics size, and EMI performance. |
| PWM Dimming Ratio | 3000:1 external, 250:1 internal - enables precise brightness control in display backlighting and adaptive lighting systems. |
| INTVCC Regulator | 7.5V ±0.2V - powers internal logic and gate drivers; eliminates need for external bias supply in most designs. |
Pinout & Package
LT3762HFE#PBF uses a 28-lead plastic TSSOP package with exposed pad (Pin 29 = GND). Thermal resistance θJA = 30°C/W; 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; bypass with ≥1µF low-ESR capacitor near pin. |
| EN/UVLO | Enable & 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 sense inputs | Rail-to-rail (0V–60V) differential pair; detects overcurrent (>600mV) and open-LED (<25mV C/10 threshold). |
| FB | Voltage feedback input | Regulates to 1.25V; triggers OPENLED if >VFB–50mV and SHORTLED if <300mV - used for CV mode and fault reporting. |
| RT | Frequency programming | Resistor-to-GND sets switching frequency from 100kHz to 1MHz; enables optimization of efficiency and component size. |
| PWMTG | P-channel MOSFET gate driver | Inverted PWM output clamped to VISP–7V; provides LED output disconnect and overcurrent protection during faults. |
| OPENLED / SHORTLED | Fault flag outputs | Open-collector pull-downs requiring external pull-up; report open-circuit and short-circuit LED conditions respectively. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost topology support | Integrated BG (low-side) and TG (high-side) N-MOSFET drivers enable >90% efficiency in 60W LED drivers without external gate drivers. |
| Spread-spectrum modulation (SSFM) | Reduces peak EMI by modulating switching frequency up to ±30% around nominal value - simplifies compliance with CISPR 25 Class 5. |
| Programmable current threshold | CTRL1/CTRL2 pins scale full-scale current sense threshold from 232mV to 257mV - enables dynamic LED current adjustment for thermal derating. |
| Robust fault protection | Dual independent flags (OPENLED/SHORTLED), thermal shutdown at 165°C, and SS pin fault timer provide layered system-level reliability. |
| High-temp rated operation | –40°C to +150°C guaranteed performance - meets AEC-Q100 Grade 0 requirements for under-hood automotive LED headlamps. |
Applications
| Automotive Headlamp Drivers | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 48V LED arrays in vehicle forward lighting with thermal management and EMI constraints. IC Role / Device Role / Timing Role: Constant-current controller managing boost converter with synchronous rectification and PWM dimming. Use Value: Enables 3000:1 dimming range and 60V output while maintaining ±3.5% current accuracy across –40°C to +150°C ambient. |
Use Scenario: Powering multi-string 36–56V LED fixtures in factory environments with wide input voltage variation. IC Role / Device Role / Timing Role: Synchronous boost LED controller with rail-to-rail current sensing and open/short LED detection. Use Value: Delivers 98% efficiency at 60W with integrated INTVCC and spread-spectrum EMI reduction for CE/FCC compliance. |
| Outdoor Signage Backlighting | Medical Surgical Lighting |
Use Scenario: Controlling brightness of large-area LED panels exposed to outdoor temperature extremes and solar loading. IC Role / Device Role / Timing Role: Dual-mode (CC/CV) controller supporting analog and PWM dimming with fault flag reporting. Use Value: Maintains stable luminance via ±2% voltage regulation and ±3.5% current regulation across –40°C to +85°C operating range. |
Use Scenario: Precision illumination control in sterile surgical environments requiring flicker-free, high-CRI light sources. IC Role / Device Role / Timing Role: High-accuracy constant-current source with soft-start (SS pin), thermal foldback, and fast transient response. Use Value: Achieves <1% current ripple and 250:1 internal PWM dimming with <100ns gate driver rise/fall times for zero-flicker operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3762EFE#PBF | Same functionality but rated for –40°C to +125°C junction temperature; lower thermal specification. | Suitable for commercial/industrial indoor lighting where ambient temperature remains below 105°C. | Select LT3762EFE#PBF only when full –40°C to +150°C operation is not required - reduces cost without sacrificing feature set. |
| LT3762HUFD#PBF | Identical electrical specs and temperature rating, but in 4mm × 5mm QFN package with θJA = 43°C/W. | Better suited for space-constrained PCB layouts where thermal path to board is optimized via exposed pad. | Choose LT3762HUFD#PBF when footprint area is critical and thermal design leverages QFN's lower θJC (3.4°C/W) vs TSSOP's 10°C/W. |
Compared with LT3762EFE#PBF, the LT3762HFE#PBF adds guaranteed operation up to +150°C junction temperature - essential for under-hood automotive use. Versus LT3762HUFD#PBF, it offers identical specs in a TSSOP package with superior board-level thermal resistance (θJA = 30°C/W), simplifying heatsinking in high-power LED drivers.
Availability
LT3762HFE#PBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, outdoor signage, and medical surgical lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3762HFE#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 (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 LT3762 product line was designed specifically for high-efficiency, high-reliability LED driver applications demanding wide input range, precise current regulation, and robust fault protection - especially in automotive and harsh-environment industrial systems.
FAQ
What is the maximum junction temperature rating for LT3762HFE#PBF?
The LT3762HFE#PBF is fully specified and guaranteed to operate over a junction temperature range of –40°C to +150°C. This rating exceeds standard industrial grade and aligns with AEC-Q100 Grade 0 requirements, making LT3762HFE#PBF suitable for under-hood automotive LED drivers where ambient temperatures exceed 125°C.
How does the LT3762HFE#PBF implement open-LED protection?
The LT3762HFE#PBF asserts the OPENLED flag when two conditions occur simultaneously: FB voltage rises above VFB–50mV (typically 1.20V) and the ISP–ISN differential falls below 25mV (C/10 threshold). This dual-condition logic prevents false triggering during transient load changes, ensuring reliable open-circuit detection in LT3762HFE#PBF-based LED systems.
Can LT3762HFE#PBF drive LEDs in buck configuration?
Yes, the LT3762HFE#PBF supports buck-mode LED driving using its rail-to-rail ISP/ISN current sense inputs and FB voltage feedback. When configured in buck topology, the LT3762HFE#PBF regulates LED current via high-side sensing and maintains ±3.5% accuracy while providing SHORTLED and OPENLED fault reporting - confirmed in the Applications section of the official datasheet.
What is the purpose of the SSFM pin on LT3762HFE#PBF?
The SSFM pin on LT3762HFE#PBF enables spread-spectrum frequency modulation to reduce electromagnetic interference (EMI). When a capacitor is connected from SSFM to GND, it generates a triangle ramp that modulates the switching frequency by ±30% around the nominal value set by the RT resistor - directly lowering peak EMI emissions without affecting LT3762HFE#PBF's regulation performance.
Does LT3762HFE#PBF require an external gate driver for the synchronous MOSFETs?
No, the LT3762HFE#PBF integrates dedicated high-current gate drivers: BG drives the low-side N-MOSFET, TG drives the high-side N-MOSFET, and PWMTG drives an external P-MOSFET for LED output disconnect. Each driver features 20ns rise/fall times (with 2.7nF load) and built-in level-shifting - eliminating the need for external gate drivers in LT3762HFE#PBF designs.
LT3762HFE#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:
- 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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3762HFE#PBF FAQ
1.How can I place an order for LT3762HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3762HFE#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 LT3762HFE#PBF reliable?
The price and inventory of LT3762HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3762HFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3762HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3762HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3762HFE#PBF?
LT3762HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3762HFE#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 LT3762HFE#PBF?
For technical support, including LT3762HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3762HFE#PBF requirements.
6.How does Aetrix verify that LT3762HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3762HFE#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 LT3762HFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3762HFE#PBF?
All LT3762HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3762HFE#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 LT3762HFE#PBF part is unused and in its original packaging.
Return procedure for LT3762HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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