My Inquiry
My Account
Analog Devices Inc. LT3966JUJ#TRPBF
- Part No.:
- LT3966JUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT3966JUJ#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.6A 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,329
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3966JUJ#TRPBF from Analog Devices is an I2C-programmable quad-channel monolithic boost LED driver with four independent 60V, 1.6A DMOS power switches, integrated 8-bit ADC (11-channel), and true-color 13-bit PWM dimming (8192:1). It supports input voltages from 3V to 60V and delivers precise analog/PWM dimming control for high-brightness automotive backlighting and HUD systems.
For engineers reviewing the LT3966JUJ#TRPBF datasheet, LT3966JUJ#TRPBF pinout, LT3966JUJ#TRPBF application, or LT3966JUJ#TRPBF equivalent, this page provides verified thermal performance (–40°C to 150°C junction), channel-level fault reporting (OPENLED/OVFB/LEDOC), multiphase switching synchronization, and I2C CRC-8 error-checked register access - all critical for safety-critical LED power management in automotive displays.
Technical Context
The LT3966JUJ#TRPBF implements four independent current-mode boost converters, each with internal 1.6A/60V DMOS switch, high-side current sensing (250mV threshold), and dedicated TG output for external PMOS PWM dimming and fast disconnect. Its I2C interface supports eight programmable addresses via ADR1/ADR2 pins and includes hardware CRC-8 (SMBus polynomial) for robust command integrity.
On-chip 8-bit ADC monitors ISP/ISN voltage per channel, VIN, die temperature, and two external inputs (EXT1/EXT2), while independent EN/UVLO, CTRL/PWM, and FB pins enable per-channel soft-start, analog dimming scaling, and overvoltage/shorted-LED detection. Multiphase operation reduces input ripple, and RT/SYNC pins allow frequency tuning (300kHz–4MHz) or external clock synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range automotive battery and industrial DC bus inputs without pre-regulation. |
| Output Current per Channel | Up to 1.6A continuous - enables high-luminance LED strings in head-up displays and instrument clusters. |
| PWM Dimming Resolution | 13-bit (8192:1) - ensures flicker-free grayscale control for color-accurate backlighting in automotive LCDs. |
| ADC Channels | 11-input (4× ISP/ISN, VIN, die temp, EXT1, EXT2) - enables real-time closed-loop LED current/voltage monitoring and thermal derating. |
| Switching Frequency Range | 300kHz to 4MHz - allows EMI optimization and compact magnetics design across varied LED load configurations. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood and dashboard-mounted automotive applications per AEC-Q100 (in progress). |
| I2C Address Options | 8 unique addresses via ADR1/ADR2 tri-state pins - supports multi-device daisy-chaining on shared bus without address conflict. |
Pinout & Package
LT3966JUJ#TRPBF is housed in a thermally enhanced 40-lead QFN package (6mm × 6mm), with exposed pad (Pin 41) soldered to PCB ground for optimal thermal dissipation (θJA = 33°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 38) | Main power input | Supplies internal LDO (INTVCC) and bias circuitry; requires local 4.7μF ceramic bypass capacitor. |
| ISP1–4 / ISN1–4 (Pins 1,40,30,31,8,9,23,22) | High-side LED current sense inputs | Kelvin-connected to sense resistor; supports 3V–55V common-mode range and 250mV full-scale threshold. |
| TG1–4 (Pins 2,29,7,24) | External PMOS gate driver outputs | Level-shifted inverted PWM signal (VISP–8.2V ON); enables fast LED disconnect and fault isolation. |
| FB1–4 (Pins 39,32,10,21) | Output voltage feedback | Regulates at 1.2V; flags OPENLED if current drops below 10% during regulation, OVFB above 1.26V. |
| CTRL/PWM1–4 (Pins 11,12,13,14) | Analog/PWM dimming control | 0.2–1.2V for 0–100% analog dimming; <100mV/<1.5V for PWM edge-triggered dimming. |
| SDA/SCL (Pins 18,19) | I2C bidirectional data/clock | 5V-tolerant, open-drain; supports 400kHz operation with mandatory CRC-8 PEC for write/read transactions. |
| ALERT (Pin 20) | Fault status indicator | Open-drain active-low output signaling OVFB, OPENLED, SHORTLED, or LEDOC across any channel. |
| EN/UVLO (Pin 36) | Enable and undervoltage lockout | 1.23V falling threshold with 15mV hysteresis; enables precision UVLO using resistor divider from VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Four independent boost channels | Enables simultaneous driving of disparate LED strings (e.g., display backlight + HUD + ambient + logo) with isolated fault handling. |
| I2C-programmable 13-bit PWM generator | Eliminates need for external PWM controllers; supports BAM mode for reduced EMI and improved grayscale linearity. |
| Integrated 11-channel 8-bit ADC | Reduces BOM count by replacing external voltage/current sensors; enables real-time telemetry for predictive thermal management. |
| High-side PMOS gate driver (TG) | Provides sub-100ns turn-on/off for precise PWM dimming and immediate LED disconnect during overcurrent or open-circuit faults. |
| Multiphase switching capability | Lowers input ripple current by up to 70% vs. single-phase operation - critical for meeting CISPR-25 Class 5 EMI limits in automotive designs. |
| AEC-Q100 qualification in progress | Validates reliability for automotive Grade 1 (–40°C to +125°C ambient) and extended junction (–40°C to +150°C) operation. |
Applications
| Automotive Instrument Cluster Backlighting | Head-Up Display (HUD) LED Driver |
|---|---|
Use Scenario: Driving segmented white LED arrays behind TFT-LCD in vehicle dashboards with variable ambient light conditions. IC Role / Device Role / Timing Role: Quad-channel boost controller providing independent current regulation and synchronized PWM dimming per segment. Use Value: 13-bit dimming resolution eliminates visible grayscale banding; onboard ADC enables automatic brightness compensation based on photodiode feedback. |
Use Scenario: Powering high-luminance green/red LED sources in augmented reality HUDs requiring flicker-free, high-contrast projection. IC Role / Device Role / Timing Role: Monolithic LED driver with high-side sensing and TG-controlled PMOS disconnect for rapid fault response (<100µs). Use Value: 1.6A per channel sustains >10,000 cd/m² brightness; multiphase switching minimizes conducted EMI near sensitive imaging sensors. |
| Automotive Center Stack Display | Commercial Vehicle Rear Lighting Control |
Use Scenario: Managing RGBW LED backlighting in infotainment touchscreens exposed to wide thermal gradients (–40°C to +85°C ambient). IC Role / Device Role / Timing Role: I2C-configurable LED driver with die temperature monitoring and per-channel shutdown for thermal derating. Use Value: On-chip ADC measures die temp and VIN to dynamically adjust LED current, preventing thermal runaway without host MCU intervention. |
Use Scenario: Controlling high-power stop/tail/turn LED modules in trucks and buses where EMI immunity and fault resilience are critical. IC Role / Device Role / Timing Role: Robust boost driver with OPENLED/SHORTLED detection and latched ALERT output for CAN bus fault reporting. Use Value: Independent channel fault flags enable precise module-level diagnostics; 60V output capability supports long LED strings without series resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3965EUJ#TRPBF | Same architecture but rated for –40°C to +125°C junction; lacks AEC-Q100 qualification path; lower max TJ. | Suitable for industrial or non-automotive displays where extended temperature is not required. | Select when cost sensitivity outweighs automotive qualification needs and thermal margin is sufficient. |
| MAX20051ATP/V+T | Quad-channel buck LED driver (not boost); 4.5V–65V input; no integrated ADC; I2C with basic fault reporting only. | Requires low-Vf LED strings; limited to step-down topologies; no per-channel voltage monitoring or external sensor inputs. | Choose only for fixed low-output-voltage LED arrays where efficiency at high duty cycle is prioritized over flexibility. |
Compared with LT3965EUJ#TRPBF and MAX20051ATP/V+T, the LT3966JUJ#TRPBF uniquely combines boost topology, 150°C junction rating, 11-channel ADC telemetry, and CRC-protected I2C - making it the only option qualified for next-generation automotive HUD and cluster systems demanding functional safety-aware power management.
Availability
LT3966JUJ#TRPBF is available at Aetrix Electronics and suitable for automotive instrument clusters, head-up displays, center stack backlights, and commercial vehicle lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3966JUJ#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3966 product line was designed specifically for high-reliability, multi-string LED lighting in automotive cockpits - emphasizing I2C configurability, integrated diagnostics, thermal robustness, and EMI-conscious multiphase operation.
FAQ
What is the maximum operating junction temperature for the LT3966JUJ#TRPBF?
The LT3966JUJ#TRPBF is specified for a maximum junction temperature of +150°C and is guaranteed over the full –40°C to +150°C operating range. This rating supports placement in thermally demanding locations such as behind automotive displays or near engine compartments, and aligns with AEC-Q100 Grade 0 qualification requirements currently in progress.
Does the LT3966JUJ#TRPBF support multiphase switching, and how is it configured?
Yes, the LT3966JUJ#TRPBF supports multiphase switching to reduce input ripple current. It is configured via I2C register settings (MPHASE bit) and uses the SYNC pin to align phase offsets between channels. When enabled, channels operate with 90° phase shifts, lowering peak input current by up to 70% compared to single-phase mode - critical for meeting CISPR-25 EMI limits.
How does the LT3966JUJ#TRPBF handle LED open-circuit faults?
The LT3966JUJ#TRPBF detects open-circuit conditions per channel when FB voltage reaches regulation (1.2V) while ISP–ISN current falls below 10% of full scale. It flags OPENLED in the fault register, pulls the ALERT pin low, and - depending on configuration - either latches off the channel or continues operation with fault reporting. No external components are required for this protection.
Can the LT3966JUJ#TRPBF operate without I2C communication?
Yes. When ADR1 and ADR2 are both tied to GND, the LT3966JUJ#TRPBF enters standalone mode: all four channels power up immediately with 100% PWM duty cycle, analog dimming controlled solely by CTRL/PWM pin voltages, and fault reporting limited to the ALERT pin. I2C registers remain inaccessible, but full analog functionality is retained.
What is the purpose of the TG pins on the LT3966JUJ#TRPBF, and what external component do they drive?
The TG1–4 pins on the LT3966JUJ#TRPBF are high-side gate drivers that control external PMOS transistors placed between the LED string anode and boost output. They provide level-shifted, inverted PWM signals (VISP–8.2V ON) for precise dimming and sub-100ns disconnect during overcurrent or open-LED faults - enabling safe, fast LED current interruption without relying on the internal switch alone.
LT3966JUJ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- 60V
- Current - Output / Channel:
- 1.6A
- Frequency:
- 300kHz ~ 2MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LT3966JUJ#TRPBF FAQ
1.How can I place an order for LT3966JUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3966JUJ#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 LT3966JUJ#TRPBF reliable?
The price and inventory of LT3966JUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3966JUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3966JUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3966JUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3966JUJ#TRPBF?
LT3966JUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3966JUJ#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 LT3966JUJ#TRPBF?
For technical support, including LT3966JUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3966JUJ#TRPBF requirements.
6.How does Aetrix verify that LT3966JUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3966JUJ#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 LT3966JUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3966JUJ#TRPBF?
All LT3966JUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3966JUJ#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 LT3966JUJ#TRPBF part is unused and in its original packaging.
Return procedure for LT3966JUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3966JUJ#TRPBF 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…
