My Inquiry
My Account
Analog Devices Inc. LT3762IUFD#PBF
- Part No.:
- LT3762IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3762IUFD#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,776
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3762IUFD#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 architectural illumination with up to 60V output voltage.
For engineers reviewing the LT3762IUFD#PBF datasheet, LT3762IUFD#PBF pinout, LT3762IUFD#PBF application, or LT3762IUFD#PBF equivalent, key selection considerations include its synchronous boost/SEPIC/buck-boost topology support, integrated 7.5V INTVCC regulator, spread-spectrum EMI reduction, PMOS PWM disconnect capability, and dual analog/digital dimming control.
Technical Context
The LT3762IUFD#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 supports precise RT-resistor programming (90–1240 kHz) and SSFM-enabled spread-spectrum modulation (–30% frequency deviation).
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). Protection includes open-LED (C/10 threshold at 25mV), short-LED (300mV FB low threshold), overcurrent (600mV ISP–ISN), and thermal shutdown (165°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 38.5V - supports wide-input battery-powered and industrial DC systems without pre-regulation |
| Max Output Voltage | 60V - enables driving long LED strings (e.g., 15× white LEDs @ 3.8V) in boost configuration |
| Current Sense Accuracy | ±3.5% CC regulation - ensures stable LED brightness across temperature and line variations |
| Switching Frequency | 100kHz to 1MHz - allows optimization of inductor size, efficiency, and EMI filtering |
| PWM Dimming Ratio | 3000:1 external, 250:1 internal - delivers high-fidelity brightness control for display backlighting and stage lighting |
| INTVCC Regulator | 7.5V ±0.2V - powers gate drivers directly, eliminating need for external bias supply |
| Package | 28-lead 4mm × 5mm QFN with exposed pad - provides low thermal resistance (θJC = 3.4°C/W) for high-power LED driver designs |
Pinout & Package
LT3762IUFD#PBF uses a 28-lead plastic QFN (4mm × 5mm) with exposed thermal pad soldered to PCB ground. Pin 29 is GND and must be connected to the thermal plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 29) | Ground reference and thermal path | Exposed pad and Pin 29 form primary thermal interface; must be soldered to large copper area for θJA = 43°C/W operation |
| ISP / ISN | High-side LED current sense inputs | Rail-to-rail sensing (0V–60V) enables direct connection to LED string cathode/anode for accurate CC regulation |
| TG / BG | Synchronous N-MOSFET gate drivers | TG drives high-side switch with bootstrap (BOOST pin); BG drives low-side switch with 230ns min on-time for high-frequency operation |
| PWMTG | Inverted P-MOSFET top-gate driver | Drives series PMOS between VISP and (VISP – 7V); 7V internal clamp prevents gate oxide damage |
| OPENLED / SHORTLED | Open-collector fault flags | Assert low during open-circuit (FB > VFB – 50mV + ISP–ISN < 25mV) or short-circuit (FB < 300mV) conditions; require external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost/SEPIC/buck-boost topology support | Enables flexible LED driver architecture selection without changing IC - SNSP/SNSN routing adapts to inductor placement and grounding scheme |
| Integrated 7.5V INTVCC regulator | Eliminates external bias supply; delivers up to 140mA to power gate drivers and internal logic under full load |
| Spread-spectrum frequency modulation (SSFM) | Reduces peak EMI by modulating switching frequency ±15% around center value - simplifies compliance with CISPR-25 Class 5 |
| Programmable C/10 open-LED detection | Configurable 12–39mV threshold (via CTRL pins) enables robust fault detection even with low-sense-resistor values (e.g., 5mΩ) |
| Dual dimming control (analog + PWM) | DIM pin sets internal PWM duty (0.4%–97%), while PWM pin accepts external 3000:1 digital signal - supports hybrid dimming for flicker-free operation |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 48V LED arrays in vehicle forward lighting with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Constant-current controller managing synchronous boost topology with 60V output, SSFM for CISPR-25 compliance, and OPENLED/SHORTLED fault reporting. Use Value: Enables single-chip solution for adaptive driving beam (ADB) systems with 3000:1 dimming depth and thermal derating down to –40°C. | Use Scenario: Powering 100W+ LED fixtures in warehouse environments requiring high reliability and surge immunity. IC Role / Device Role / Timing Role: Dual-mode regulator operating in constant-current mode for LED regulation and constant-voltage mode for auxiliary circuitry (e.g., sensors, comms). Use Value: Delivers ±3.5% current accuracy over temperature, reducing binning requirements and enabling consistent lumen output across 50,000-hour lifetime. |
| Architectural Accent Lighting | UV-C Disinfection System |
Use Scenario: Controlling color-tunable RGBW LED strips in commercial building façades with smooth analog dimming. IC Role / Device Role / Timing Role: Analog-dimming interface via DIM pin, synchronized PWM dimming via PWM pin, and rail-to-rail ISP–ISN sensing for low-dropout current regulation. Use Value: Achieves flicker-free 250:1 internal PWM dimming with <1% THD, meeting IEC TR 61547-1 photobiological safety requirements. | Use Scenario: Driving high-voltage UV-C LED strings (36–54V) requiring precise current limiting and overtemperature protection. IC Role / Device Role / Timing Role: Constant-current source with programmable overcurrent threshold (600mV ISP–ISN), thermal shutdown (165°C), and open-LED detection for lamp-end-of-life signaling. Use Value: Ensures UV dose consistency by maintaining ±3.5% current regulation despite 50°C ambient rise, critical for medical-grade disinfection efficacy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EUF#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 CC regulation or dimming interfaces | Choose when system requires bidirectional voltage conversion (VIN > VOUT or VIN < VOUT) without dedicated LED fault flags |
| LM3423MH/NOPB | Asynchronous boost LED controller; no synchronous TG driver; max 40V output; no SSFM or internal PWM generator | Lower cost, lower efficiency solution for non-automotive LED applications where EMI and dimming depth are less critical | Choose for cost-sensitive industrial lighting where 3000:1 dimming and 60V output are not required |
Compared with LTC3789EUF#PBF and LM3423MH/NOPB, the LT3762IUFD#PBF uniquely integrates LED-specific features - including rail-to-rail current sensing, dual dimming control, open/short LED flags, and 60V synchronous boost capability - making it the only option qualified for AEC-Q100 automotive LED headlamp designs requiring functional safety awareness.
Availability
LT3762IUFD#PBF is available at Aetrix Electronics and suitable for automotive lighting, industrial high-bay fixtures, and UV-C disinfection systems requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term production continuity.
Supply support for LT3762IUFD#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 digital signal processing semiconductors.
The LT3762IUFD#PBF belongs to the Linear Technology LED controller product line, designed specifically for high-efficiency, high-reliability constant-current LED driving in demanding environments including automotive, industrial, and medical applications.
FAQ
What is the maximum input voltage rating for the LT3762IUFD#PBF?
The LT3762IUFD#PBF has an absolute maximum VIN rating of 60V for nonrepetitive transients (≤1 second) and 38.5V for continuous operation at TJ ≤ 125°C. This rating applies to the VIN, EN/UVLO, SNSP, SNSN, and SW pins. Exceeding 38.5V continuously above 125°C junction temperature violates safe operating area limits and may impair reliability. The LT3762IUFD#PBF datasheet specifies 2.5V to 38.5V normal operating range.
Does the LT3762IUFD#PBF support SEPIC topology, and what pin configuration enables it?
Yes, the LT3762IUFD#PBF supports SEPIC topology using nonsynchronous operation. To configure SEPIC, connect SNSP to the source of the low-side FET and SNSN to the ground side of the current sense resistor. This routing leverages the rail-to-rail current sense amplifier's ability to operate with SNSN referenced to ground rather than VIN. The LT3762IUFD#PBF's current-mode architecture and wide ISP–ISN common-mode range (0V–60V) ensure stable regulation in SEPIC mode without additional components.
How does the LT3762IUFD#PBF implement open-LED protection, and what is the C/10 threshold?
The LT3762IUFD#PBF asserts the OPENLED flag when FB exceeds VFB – 50mV (typical) AND the ISP–ISN voltage drops below the C/10 threshold - which is programmable from 12mV to 39mV depending on CTRL pin voltage. At CTRL = 0V, the threshold is 25mV (typical), corresponding to 10% of full-scale current sense (250mV). This C/10 detection enables reliable open-circuit identification even with low-value sense resistors, preventing thermal runaway in failed LED strings. The LT3762IUFD#PBF latches OPENLED state during PWM low periods for diagnostic logging.
What is the function of the PWMTG pin on the LT3762IUFD#PBF, and how is it used in LED disconnect?
The PWMTG pin on the LT3762IUFD#PBF is an inverted P-MOSFET gate driver that outputs VISP – 7V (clamped) when active, enabling series PMOS disconnect between the LED string and input supply. During PWM low periods, PWMTG goes high, turning off the PMOS and fully isolating the LED string - achieving true output disconnect for zero leakage current. This feature is essential for fail-safe operation in automotive lighting, where ISO 26262 requires physical disconnection during fault conditions. The LT3762IUFD#PBF's 7V internal clamp protects the PMOS gate oxide regardless of input voltage.
Can the LT3762IUFD#PBF operate in constant-voltage mode, and how is it configured?
Yes, the LT3762IUFD#PBF operates in constant-voltage mode by connecting the FB pin to the regulated output node (e.g., BOOST capacitor) instead of the current sense amplifier output. In this configuration, the internal transconductance amplifier regulates FB to 1.25V ±2%, enabling accurate CV regulation for auxiliary supplies or battery charging circuits. The LT3762IUFD#PBF retains all protections - including overvoltage (OVFB), short-circuit (SHORTLED), and thermal shutdown - while in CV mode. Applications include LED driver bias supplies and current-limited voltage regulators.
LT3762IUFD#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT3762IUFD#PBF FAQ
1.How can I place an order for LT3762IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3762IUFD#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 LT3762IUFD#PBF reliable?
The price and inventory of LT3762IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3762IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT3762IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3762IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3762IUFD#PBF?
LT3762IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3762IUFD#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 LT3762IUFD#PBF?
For technical support, including LT3762IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3762IUFD#PBF requirements.
6.How does Aetrix verify that LT3762IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3762IUFD#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 LT3762IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT3762IUFD#PBF?
All LT3762IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3762IUFD#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 LT3762IUFD#PBF part is unused and in its original packaging.
Return procedure for LT3762IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3762IUFD#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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
