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Analog Devices Inc. LT3762HUFD#PBF
- Part No.:
- LT3762HUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3762HUFD#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LT3762HUFD#PBF 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. 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 LT3762HUFD#PBF datasheet, LT3762HUFD#PBF pinout, LT3762HUFD#PBF application, or LT3762HUFD#PBF equivalent, key selection criteria include its -40°C to +150°C operating junction temperature, integrated 7.5V INTVCC regulator, spread-spectrum modulation (SSFM) for EMI reduction, PMOS switch driver for output disconnect, and dual-mode operation in boost, SEPIC, buck, or buck-boost topologies.
Technical Context
The LT3762HUFD#PBF 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 oscillator uses an external RT resistor to set frequency from 100kHz to 1MHz, while SSFM pin enables triangle-wave-modulated frequency shifting (–30% deviation) to suppress conducted EMI peaks.
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 - an inverted, clamped (7V) P-MOSFET driver enabling LED output disconnect and overcurrent protection. The internal 7.5V INTVCC regulator powers all logic and drivers, eliminating need for external bias supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 38.5V input - supports wide-input battery and industrial rails including 12V/24V automotive systems. |
| Output Voltage | Up to 60V - enables driving long LED strings (e.g., 15× 3.5V white LEDs) in boost configuration. |
| Current Regulation | ±3.5% accuracy - ensures stable LED brightness across temperature and line variations without external calibration. |
| Switching Frequency | 100kHz–1MHz (RT-programmable) - balances efficiency, inductor size, and EMI compliance in space-constrained designs. |
| Dimming Ratio | 3000:1 external PWM - meets stringent automotive headlight and display backlight dimming requirements. |
| Operating Temp | -40°C to +150°C junction - qualified for under-hood automotive and high-ambient industrial environments. |
| INTVCC Regulator | 7.5V ±0.2V - powers gate drivers and logic independently, reducing external BOM and improving startup reliability. |
Pinout & Package
LT3762HUFD#PBF uses a 28-lead 4mm × 5mm plastic QFN package with exposed thermal pad (Pin 29 = GND). Thermal resistance θJA = 43°C/W, θJC = 3.4°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 29) | Ground reference & thermal path | Exposed pad tied directly to PCB ground plane; critical for thermal dissipation and noise immunity. |
| ISP / ISN | High-side LED current sense inputs | Rail-to-rail sensing (0V–60V) enables accurate constant-current regulation regardless of LED string voltage. |
| SW / BOOST / TG / BG | Power switching node & gate drivers | SW connects to boost capacitor negative; BOOST supplies TG bootstrapping; TG/BG drive synchronous MOSFETs. |
| PWMTG | Inverted P-MOSFET gate driver | Drives series PMOS between VISP and (VISP – 7V); enables safe LED output disconnect and short-circuit protection. |
| FB | Voltage feedback & fault detection | Regulates to 1.25V; triggers OPENLED/SHORTLED flags when out-of-range - supports CV mode and LED protection. |
| RT / SSFM / SS | Frequency, EMI, and soft-start control | RT sets switching frequency; SSFM enables spread-spectrum; SS provides soft-start timing and fault latching. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost topology support | Enables >90% efficiency at 60W (e.g., 3V–24VIN → 30V/2A LED) by eliminating diode conduction loss. |
| Integrated 7.5V INTVCC regulator | Eliminates need for external bias supply; delivers up to 140mA, powering gate drivers and internal logic reliably. |
| Spread-spectrum modulation (SSFM) | Reduces peak EMI by modulating switching frequency ±15% around center value - simplifies EMC filter design. |
| Programmable open/short LED protection | OPENLED flag asserts when VISP–ISN < 25mV and FB > VFB–50mV; SHORTLED asserts if FB < 300mV or VISP–ISN > 600mV. |
| 3000:1 external PWM dimming | Supports automotive ADB and adaptive lighting via clean, jitter-free digital PWM signal applied to PWM pin. |
Applications
| Automotive Headlights | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Adaptive driving beam (ADB) systems requiring precise, fast-response LED current control across wide input voltage (9V–16V) and ambient temperature (-40°C to +125°C). IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current with ±3.5% accuracy; PWMTG enables microsecond-level LED on/off sequencing for pixelated beam shaping. Use Value: Enables compliance with UNECE R149 photometric standards via stable current regulation and 3000:1 dimming resolution. | Use Scenario: 100W+ LED fixtures for warehouse and factory lighting powered from 24VDC or 48VDC industrial rails. IC Role / Device Role / Timing Role: Synchronous boost controller delivering up to 60V/1.7A output; SSFM reduces conducted EMI to meet CISPR 11 Class B limits without oversized filters. Use Value: Achieves >94% efficiency at full load, minimizing thermal stress and extending fixture lifetime in enclosed enclosures. |
| Battery-Powered Portable Lighting | LED Signage & Display Backlight |
Use Scenario: Rechargeable emergency lights and portable work lamps using Li-ion (2.5V–4.2V/cell) or 12V sealed lead-acid batteries. IC Role / Device Role / Timing Role: Wide-VIN (2.5V–38.5V) boost controller maintaining constant LED brightness during battery discharge; EN/UVLO prevents deep discharge. Use Value: Extends runtime by sustaining regulated LED output down to 2.5V input, avoiding premature dimming or shutdown. | Use Scenario: Large-format indoor/outdoor LED video walls and retail signage requiring uniform brightness and flicker-free dimming. IC Role / Device Role / Timing Role: Constant-current source with analog dimming (via CTRL1/CTRL2) and internal PWM generator (800Hz typical) for smooth, low-frequency intensity control. Use Value: Delivers 250:1 internal PWM dimming and ±2% CV regulation - eliminates visible banding and improves grayscale fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#PBF | 4-switch synchronous buck-boost controller; no integrated LED-specific protections (OPENLED/SHORTLED); requires external current sense amp. | Designed for general DC/DC conversion, not optimized for LED constant-current regulation or dimming interfaces. | Select only if system requires bidirectional voltage conversion (VIN > VOUT or VIN < VOUT) and can implement custom LED protection logic. |
| LM3409QMH/NOPB | Asynchronous boost LED controller; max 40V output; no SSFM; 1000:1 PWM dimming; -40°C to +125°C rating. | Lacks synchronous rectification, spread-spectrum, and high-temp rating - limited to lower-power, cost-sensitive lighting. | Choose for simpler, lower-cost designs where 60V output, 150°C operation, or EMI reduction are not required. |
Compared with LTC3789EMSE#PBF and LM3409QMH/NOPB, the LT3762HUFD#PBF uniquely combines 60V synchronous boost capability, automotive-grade temperature range, integrated LED protection flags, and SSFM - making it optimal for high-reliability, high-efficiency LED systems demanding robustness and regulatory compliance.
Availability
LT3762HUFD#PBF is available at Aetrix Electronics and suitable for automotive lighting, industrial high-bay fixtures, and battery-powered portable lighting requiring stable component supply, extended temperature operation, and EMI-compliant power conversion.
Supply support for LT3762HUFD#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 ICs.
The LT3762HUFD#PBF belongs to Linear's LED controller product line, designed specifically for high-efficiency, high-reliability constant-current LED drivers in automotive, industrial, and architectural lighting applications.
FAQ
What is the maximum output voltage supported by the LT3762HUFD#PBF?
The LT3762HUFD#PBF supports synchronous boost output voltage up to 60V. This is confirmed in the "Features" section and Typical Application schematic (3762 TA01a), where a 30V, 2A LED load is driven from 3V–24V input. The absolute maximum rating for ISP, ISN, SW, and BOOST pins is 80V, but functional boost operation is specified to 60V per datasheet Section 1 and Absolute Maximum Ratings table.
Does the LT3762HUFD#PBF support both constant-current and constant-voltage regulation modes?
Yes, the LT3762HUFD#PBF supports both modes. Constant-current regulation achieves ±3.5% accuracy via ISP/ISN sensing; constant-voltage regulation holds FB at 1.25V ±2%. The FB pin serves dual roles: voltage feedback for CV mode and open-LED fault detection in CC mode - explicitly stated in the "Description" and "Features" sections.
How does the LT3762HUFD#PBF implement spread-spectrum frequency modulation?
The LT3762HUFD#PBF implements spread-spectrum modulation via the SSFM pin. When enabled, it generates a triangle ramp that modulates the internal switching frequency between FSWITCH and FSWITCH – 30%, reducing EMI peak amplitudes. The ramp frequency is set by CSSFM (12μA/(2 × 1V × CSSFM)), as detailed in Pin Functions (Section 12) and Electrical Characteristics (Table 2).
What is the purpose of the PWMTG pin on the LT3762HUFD#PBF?
The PWMTG pin on the LT3762HUFD#PBF is an inverted P-MOSFET gate driver that outputs VISP – 7V (clamped) when active. It enables safe LED output disconnect, overcurrent protection, and short-circuit protection - described in "Features", "Pin Functions", and Block Diagram (Section 13). It is distinct from TG/BG and operates independently of synchronous switching.
Is the LT3762HUFD#PBF qualified for automotive under-hood applications?
Yes, the LT3762HUFD#PBF is qualified for automotive under-hood use. Its H-grade temperature rating covers –40°C to +150°C junction temperature (Order Information table, Page 2), and it includes features critical for automotive: programmable UVLO, OPENLED/SHORTLED fault flags, thermal shutdown at 165°C, and AEC-Q100 stress testing alignment per Linear's automotive qualification process.
LT3762HUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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-QFN (4x5)
LT3762HUFD#PBF FAQ
1.How can I place an order for LT3762HUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3762HUFD#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 LT3762HUFD#PBF reliable?
The price and inventory of LT3762HUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3762HUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT3762HUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3762HUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3762HUFD#PBF?
LT3762HUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3762HUFD#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 LT3762HUFD#PBF?
For technical support, including LT3762HUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3762HUFD#PBF requirements.
6.How does Aetrix verify that LT3762HUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3762HUFD#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 LT3762HUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT3762HUFD#PBF?
All LT3762HUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3762HUFD#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 LT3762HUFD#PBF part is unused and in its original packaging.
Return procedure for LT3762HUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3762HUFD#PBF Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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