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Analog Devices Inc. LT3966JUJ#PBF
- Part No.:
- LT3966JUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT3966JUJ#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.6A 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,211
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Product details
Overview
LT3966JUJ#PBF 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 operates up to 150°C junction temperature, targeting automotive HUDs and high-reliability backlighting systems.
For engineers reviewing the LT3966JUJ#PBF datasheet, LT3966JUJ#PBF pinout, LT3966JUJ#PBF application, or LT3966JUJ#PBF equivalent, this page delivers verified specifications including thermal grade (–40°C to 150°C), QFN-40 package mapping, per-channel ISP/ISN current sensing, TG gate driver timing, and I2C address configuration via ADR1/ADR2 pins.
Technical Context
The LT3966JUJ#PBF implements four independent current-mode boost converters, each with internal 1.6A/60V DMOS switch, high-side LED current sensing (250mV threshold), and dedicated TG output for external PMOS PWM dimming and fault disconnect. Its 8-bit ADC measures VIN, die temperature, two external inputs, and per-channel VOUT/ILED.
I2C control enables full programmability of PWM dimming resolution (6–13 bit), analog dimming DAC (8-bit), multiphase switching synchronization, fault reporting (OVFB, OPENLED, SHORTLED, LEDOC), and watchdog timeout (75–125ms). The device uses CRC-8 PEC for robust communication and supports standalone mode when ADR1/ADR2 = GND/GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range automotive and industrial DC supplies without external pre-regulation. |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive applications requiring extended thermal margin. |
| LED Channel Count | 4 independent channels - enables simultaneous driving of multiple display zones or RGBW strings. |
| PWM Dimming Resolution | 13-bit (8192:1) - provides flicker-free, high-fidelity grayscale control for premium displays. |
| ADC Channels | 11 inputs (4× ISP/ISN, 4× FB, VIN, INTVCC, TEMP, EXT1, EXT2) - enables closed-loop system monitoring without external sensors. |
| Switching Frequency Range | 300kHz to 4MHz - allows EMI optimization and inductor size reduction across diverse lighting designs. |
| I²C Address Options | 8 configurable addresses via ADR1/ADR2 tri-state pins - supports multi-device bus topology without address conflict. |
Pinout & Package
LT3966JUJ#PBF is housed in a thermally enhanced 6mm × 6mm, 40-lead plastic QFN package with exposed pad (Pin 41) soldered to PCB ground for optimal thermal dissipation. Pin numbering follows top-view layout with functional grouping across four quadrants for channel symmetry.
| 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. |
| EN/UVLO (Pin 36) | Enable & UVLO control | Falling threshold at 1.23V ±30mV; enables precision input voltage turn-on sequencing. |
| ISP1–4 / ISN1–4 (Pins 1,40,30,31,8,9,23,22) | High-side current sense inputs | Kelvin-connected to LED sense resistor; supports 3V–55V common-mode range and 250mV full-scale threshold. |
| TG1–4 (Pins 2,29,7,24) | PMOS gate driver outputs | Level-shifted inverted PWM signal (VISP–8.2V ON); enables fast LED disconnect during fault conditions. |
| FB1–4 (Pins 39,32,10,21) | Voltage feedback inputs | Regulates output voltage at 1.2V threshold; flags OVFB (>1.26V), OPENLED (<10% current), SHORTLED (<0.3V). |
| CTRL/PWM1–4 (Pins 11–14) | Analog/PWM dimming interface | Accepts 0.2–1.2V analog dimming or <100mV/ >1.5V logic-level PWM; not floating-tie to INTVCC if unused. |
| ADR1/ADR2 (Pins 16–17) | I²C address select | Tri-state inputs (GND/FLOAT/VCC) configure one of eight I²C addresses or standalone mode (GND/GND). |
| ALERT (Pin 20) | Fault reporting output | Open-drain active-low signal indicating any channel fault (OVFB, OPENLED, SHORTLED, LEDOC). |
| SDA/SCL (Pins 18–19) | I²C bidirectional bus | 400kHz compliant with CRC-8 PEC; supports multi-master operation and error-resilient command execution. |
Key Features
| Feature | Design Value |
|---|---|
| Four independent boost channels | Enables zonal brightness control and redundancy in critical lighting systems without cross-channel coupling. |
| I²C-programmable 13-bit PWM generator | Delivers 8192-step grayscale fidelity for high-end automotive HUDs and medical displays requiring precise luminance gradation. |
| Onboard 11-input 8-bit ADC | Eliminates need for external voltage/current monitors-measures all four channel outputs plus VIN, temperature, and two user-defined signals. |
| High-side PMOS gate driver (TG) | Provides sub-100ns turn-on/off for rapid LED disconnect during overcurrent or open-circuit faults, enhancing system safety. |
| Multiphase switching support | Reduces input ripple current by interleaving channel switching phases-critical for low-noise power supply design. |
| AEC-Q100 qualification in progress | Indicates formal automotive reliability testing underway, supporting early integration into Tier-1 vehicle subsystems. |
Applications
| Automotive Heads-Up Display (HUD) | Industrial Panel Backlighting |
|---|---|
Use Scenario: High-brightness, temperature-stable projection onto windshield under direct sunlight exposure. IC Role / Device Role / Timing Role: Quad-channel boost driver delivering synchronized, independently dimmed LED strings for RGBW color mixing and dynamic contrast control. Use Value: 150°C junction rating ensures uninterrupted operation in confined dashboard enclosures; 13-bit PWM eliminates visible grayscale banding. |
Use Scenario: Wide-input-voltage (12–48V) backlight for ruggedized HMI panels in factory automation equipment. IC Role / Device Role / Timing Role: Single-chip solution managing four independent LED zones with real-time current/voltage telemetry via integrated ADC. Use Value: Eliminates external current-sense amplifiers and microcontroller ADC overhead; EN/UVLO enables clean power sequencing with legacy 24V rails. |
| Medical Imaging Console Lighting | Avionics Display Illumination |
Use Scenario: Flicker-free, calibrated illumination for diagnostic monitor bezels requiring Class I laser safety compliance. IC Role / Device Role / Timing Role: I²C-controlled constant-current source with fault-latched ALERT signaling for fail-safe shutdown on open/short LED events. Use Value: CRC-8 PEC ensures command integrity in EMI-heavy hospital environments; standalone mode (ADR1/ADR2=GND) enables basic operation without host MCU. |
Use Scenario: Redundant, radiation-tolerant backlight for cockpit multifunction displays operating across –55°C to +85°C ambient. IC Role / Device Role / Timing Role: Thermally robust quad-driver with multiphase sync capability to minimize conducted emissions on shared aircraft power buses. Use Value: Exposed-pad QFN package achieves θJA = 33°C/W-critical for conduction-cooled avionics chassis; 60V absolute max rating accommodates transients. |
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 |
|---|---|---|---|
| LT3965JUJ#PBF | Triple-channel version (3× 1.6A boost); lacks fourth channel and EXT1/EXT2 ADC inputs. | Suitable only for 3-zone lighting; cannot replace LT3966JUJ#PBF in quad-zone or dual-external-sensor designs. | Select when system requires exactly three independent LED strings and space/power constraints prohibit dual ICs. |
| MAX20051ATPA/VY+ | Quad-channel synchronous buck LED driver (not boost); 40V max input; no integrated ADC or I²C programmable PWM. | Requires external current-sense amps and MCU-based dimming control; limited to lower-output-voltage applications. | Choose for cost-sensitive, non-automotive applications where input voltage ≤40V and external control is acceptable. |
Compared with LT3965JUJ#PBF and MAX20051ATPA/VY+, the LT3966JUJ#PBF uniquely combines quad boost architecture, 60V input, onboard 11-channel ADC, and 13-bit I²C PWM-enabling single-chip, high-fidelity, thermally robust lighting control unattainable with alternatives.
Availability
LT3966JUJ#PBF is available at Aetrix Electronics and suitable for automotive HUDs, industrial panel backlighting, medical imaging consoles, and avionics displays requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3966JUJ#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3966 product line was designed specifically for high-reliability, multi-channel LED lighting in thermally demanding environments-emphasizing integrated diagnostics, I²C configurability, and AEC-Q100 readiness.
FAQ
What is the maximum junction temperature rating for the LT3966JUJ#PBF?
The LT3966JUJ#PBF is rated for a maximum junction temperature of 150°C and guaranteed to meet all specifications across –40°C to 150°C. This J-grade thermal specification distinguishes it from the E-grade (125°C) variant and supports under-hood automotive deployment where ambient temperatures exceed 105°C.
Does the LT3966JUJ#PBF support standalone operation without I²C communication?
Yes-the LT3966JUJ#PBF supports standalone mode when ADR1 and ADR2 are both tied to GND. In this configuration, all four channels enable immediately after soft-start, analog/PWM dimming is controlled solely via CTRL/PWM pins, and fault reporting occurs only on the ALERT pin without latching or register readback.
How does the LT3966JUJ#PBF handle LED open-circuit faults?
The LT3966JUJ#PBF detects open LED conditions when FB voltage reaches regulation (≈1.2V) while ISP–ISN current falls below 10% of full scale. It flags OPENLED per channel, pulls ALERT low, and-depending on I²C-configured fault handling-can latch off the affected channel or continue operation with fault logging.
What is the purpose of the TG pins on the LT3966JUJ#PBF?
The TG1–4 pins on the LT3966JUJ#PBF drive the gate of external high-side PMOS transistors to enable precise PWM dimming and fast LED disconnect during faults. Each TG output is level-shifted and inverted, swinging between VISP (OFF) and VISP–8.2V (ON) to ensure reliable MOSFET turn-on across the full 3V–60V ISP range.
Can the LT3966JUJ#PBF measure input voltage and die temperature?
Yes-the LT3966JUJ#PBF's 11-channel 8-bit ADC directly measures VIN (via dedicated input), internal die temperature (via on-die sensor), plus four ISP/ISN pairs, four FB inputs, and two user-defined EXT1/EXT2 signals-providing comprehensive system telemetry without external components.
LT3966JUJ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3966JUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3966JUJ#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 LT3966JUJ#PBF reliable?
The price and inventory of LT3966JUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3966JUJ#PBF is usually 5 days.
3.What payment methods are accepted for LT3966JUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3966JUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3966JUJ#PBF?
LT3966JUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3966JUJ#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 LT3966JUJ#PBF?
For technical support, including LT3966JUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3966JUJ#PBF requirements.
6.How does Aetrix verify that LT3966JUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LT3966JUJ#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 LT3966JUJ#PBF meets industry standards.
7.What is the process for return or replacement of LT3966JUJ#PBF?
All LT3966JUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3966JUJ#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 LT3966JUJ#PBF part is unused and in its original packaging.
Return procedure for LT3966JUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3966JUJ#PBF Tags
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