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Analog Devices Inc. LT3966EUJ#PBF
- Part No.:
- LT3966EUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT3966EUJ#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.6A 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,503
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Product details
Overview
LT3966EUJ#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 analog/PWM dimming via CTRL/PWM pins, high-side PMOS disconnect, and operates from 3V to 60V input for automotive HUDs and industrial backlighting.
For engineers reviewing the LT3966EUJ#PBF datasheet, LT3966EUJ#PBF pinout, LT3966EUJ#PBF application, or LT3966EUJ#PBF equivalent, key selection considerations include its 40-lead 6mm × 6mm QFN package, I2C-addressable fault reporting (ALERT), multiphase switching capability, and dual-dimming control architecture supporting both external PWM signals and internal programmable generators.
Technical Context
The LT3966EUJ#PBF 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 gate drive. Its 8-bit ADC monitors ISP/ISN voltages per channel, VIN, die temperature, and two external inputs (EXT1/EXT2) with 1.275V full-scale range.
I2C interface supports CRC-8 PEC error checking, watchdog timeout (75–125ms), and eight configurable addresses via ADR1/ADR2 tri-state pins. Switching frequency is adjustable from 300kHz to 4MHz using RT resistor or synchronized externally via SYNC pin, with multiphase mode reducing input ripple.
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. |
| Output Current Sensing Threshold | 250mV (typ) - enables precise LED current regulation with minimal sense resistor power loss. |
| PWM Dimming Resolution | 13-bit (8192:1) - delivers high-fidelity grayscale control for color-critical displays and HUDs. |
| ADC Channels & Resolution | 11-channel, 8-bit - measures per-channel LED voltage/current, VIN, temperature, and two external analog inputs for closed-loop system monitoring. |
| Switching Frequency Range | 300kHz to 4MHz - allows optimization of efficiency vs. EMI and inductor size across diverse lighting designs. |
| Package | 40-lead 6mm × 6mm QFN - thermally enhanced layout with exposed GND pad for >125°C junction operation. |
| Operating Junction Temp | –40°C to 125°C - qualified for extended-temperature automotive and industrial environments. |
Pinout & Package
LT3966EUJ#PBF is housed in a thermally enhanced 40-lead plastic QFN package (6mm × 6mm) with exposed GND pad (Pin 41) requiring PCB soldering for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 38) | Main power input | Supplies internal LDO (INTVCC) and bias circuitry; requires local 4.7μF bypass capacitor. |
| EN/UVLO (Pin 36) | Enable / UVLO control | Logic-level ON/OFF control or precision UVLO threshold (1.23V falling) via resistor divider from VIN. |
| ISP1–4 (Pins 1,30,8,23) | LED current sense positive | High-side sense node; also supplies TG driver; connects to + side of current sense resistor. |
| ISN1–4 (Pins 40,31,9,22) | LED current sense negative | Kelvin connection to – side of current sense resistor; enables accurate high-side current measurement. |
| TG1–4 (Pins 2,29,7,24) | PMOS gate driver output | Inverted, level-shifted PWM signal driving external high-side PMOS for fast LED disconnect and dimming. |
| CTRL/PWM1–4 (Pins 11–14) | Analog/PWM dimming input | Accepts 0.2–1.2V analog dimming or <100mV–>1.5V PWM signal; not floating - tie to INTVCC if unused. |
| FB1–4 (Pins 39,32,10,21) | Output voltage feedback | Regulates boost output voltage at 1.2V threshold; flags OPENLED/SHORTLED/OVFB faults. |
| SDA/SCL (Pins 18–19) | I2C bidirectional interface | 400kHz I2C bus with CRC-8 PEC; supports eight addresses via ADR1/ADR2 configuration. |
| ALERT (Pin 20) | Fault reporting output | Open-drain active-low signal indicating FB overvoltage, open/short LED, or LED overcurrent on any channel. |
| INTVCC (Pin 37) | Internal 3V LDO output | Powers all internal circuitry; max 2mA external load; requires 4.7μF ceramic capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| I2C-programmable 13-bit PWM generator | Enables flicker-free, high-resolution dimming (8192:1) without external timing components or MCU GPIO overhead. |
| Four independent high-side current sense amplifiers | Supports per-channel LED current regulation up to 60V with 250mV threshold and 10% C/10 overcurrent detection. |
| Integrated 11-input 8-bit ADC | Monitors real-time LED voltage/current, input supply, die temperature, and two user-defined analog inputs for system health diagnostics. |
| Multiphase switching mode | Reduces input capacitor RMS current and EMI by staggering channel switching phases - critical for high-power LED arrays. |
| Autonomous fault handling with ALERT pin | Detects and reports open LED, shorted LED, FB overvoltage, and LED overcurrent without host intervention; latch-off optional via I2C. |
Applications
| Automotive Heads-Up Display (HUD) | Industrial Backlighting |
|---|---|
Use Scenario: High-brightness, color-accurate projection onto windshield under variable ambient light and temperature. IC Role / Device Role / Timing Role: Quad-channel boost driver delivering stable current to RGB LED strings with synchronized PWM dimming and real-time thermal compensation. Use Value: 13-bit PWM resolution ensures smooth grayscale transitions; onboard ADC enables closed-loop brightness/temperature compensation without external sensors. | Use Scenario: Uniform, dimmable illumination for control panels, medical displays, and ruggedized HMI interfaces. IC Role / Device Role / Timing Role: Four independent boost channels powering segmented LED backlights with independent analog dimming and fault isolation. Use Value: Independent channel shutdown prevents single-point failure; high-side sensing eliminates ground-referenced current path constraints in isolated systems. |
| Avionics Cabin Lighting | Test & Measurement Instrumentation |
Use Scenario: FAA-certifiable LED lighting with strict EMI, reliability, and fault-reporting requirements across wide temperature ranges. IC Role / Device Role / Timing Role: I2C-configurable LED driver with CRC-protected communication, watchdog timer, and autonomous fault flagging via ALERT pin. Use Value: AEC-Q100 qualification in progress; 125°C operating junction temperature; robust I2C with PEC ensures deterministic communication in noisy avionics busses. | Use Scenario: Programmable light sources in optical calibration rigs requiring precise intensity control and channel-to-channel matching. IC Role / Device Role / Timing Role: Precision current source with 250mV sense threshold, 8-bit ADC readback, and I2C register access for dynamic calibration and traceability. Use Value: Per-channel current measurement accuracy enables real-time gain/offset correction; multiphase mode minimizes input ripple affecting sensitive analog measurements. |
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#PBF | Triple-channel version (3× boost); same 60V/1.6A switches, 13-bit PWM, and ADC architecture but lacks fourth channel. | Suitable only for 3-channel LED systems; no direct pin compatibility - different pin count (32-lead QFN) and routing. | Select when system requires exactly three independent LED strings and board space/layout must be minimized. |
| MAX20051ATP/V+T | Quad-channel buck LED driver (not boost); 40V max input; integrated MOSFETs; no onboard ADC or I2C programmable PWM generator. | Requires lower input voltage and LED string voltage < VIN; lacks per-channel telemetry and high-resolution dimming control. | Prefer for cost-sensitive, low-voltage (<40V) applications where boost topology is unnecessary and external monitoring is acceptable. |
Compared with LT3965EUJ#PBF and MAX20051ATP/V+T, the LT3966EUJ#PBF uniquely combines quad-channel boost architecture, 13-bit I2C PWM, and 11-channel ADC in a single 40-lead QFN - enabling compact, high-fidelity, self-monitoring LED systems where string voltage exceeds input rail.
Availability
LT3966EUJ#PBF is available at Aetrix Electronics and suitable for automotive HUDs, industrial backlighting, avionics cabin lighting, and test instrumentation requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LT3966EUJ#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3966EUJ#PBF belongs to Analog Devices' Power by Linear™ LED driver product line, engineered specifically for high-reliability, multi-channel LED lighting in demanding environments where precision dimming, fault resilience, and system-level telemetry are critical.
FAQ
What is the maximum LED string voltage supported by the LT3966EUJ#PBF?
The LT3966EUJ#PBF supports LED string voltages up to 60V, as confirmed by its absolute maximum ISP–ISN rating of 2V and ISP voltage limit of 62V. Each channel's boost converter regulates output voltage via the FB pin (1.2V threshold), allowing safe operation with LED strings whose forward voltage plus margin remains within the 60V output capability. This makes the LT3966EUJ#PBF suitable for high-brightness automotive and industrial LED arrays.
Does the LT3966EUJ#PBF require external PWM signal generation, or does it include an internal generator?
The LT3966EUJ#PBF includes a fully integrated 13-bit digital PWM generator (8192:1 resolution) controllable via I2C, eliminating the need for external PWM sources in most applications. It also supports external PWM input via CTRL/PWM1–4 pins. The internal generator offers selectable modes including standard PWM and Bit Angle Modulation (BAM), and its output is synchronized across all four channels - a key capability of the LT3966EUJ#PBF for coherent multi-string dimming.
How does the LT3966EUJ#PBF handle LED open-circuit or short-circuit faults?
The LT3966EUJ#PBF autonomously detects open LED (via FB < 1.16V after soft-start), shorted LED (FB < 0.3V), and overcurrent (ISP–ISN > 370mV) conditions per channel. Detected faults trigger the open-drain ALERT pin and can be latched or auto-cleared based on I2C configuration. Fault status is readable per channel via dedicated registers - a core diagnostic feature of the LT3966EUJ#PBF that enables robust system-level fault management without continuous host polling.
Can the LT3966EUJ#PBF operate without I2C communication?
Yes - the LT3966EUJ#PBF supports standalone mode when ADR1 and ADR2 are both grounded. In this mode, all four channels enable immediately after soft-start, dimming generators are disabled (100% on time), and analog/PWM dimming is controlled solely by the CTRL/PWM pins. Faults are reported on ALERT but not latched. This provides functional operation without I2C firmware, making the LT3966EUJ#PBF adaptable to simple or legacy control architectures.
What thermal management provisions does the LT3966EUJ#PBF package include?
The LT3966EUJ#PBF uses a 40-lead 6mm × 6mm QFN package with an exposed thermal pad (Pin 41) that must be soldered to a PCB copper plane for effective heat dissipation. With θJA = 33°C/W, the package supports continuous operation up to 125°C junction temperature. The device also integrates overtemperature protection that temporarily suspends switching above 150°C - a built-in safeguard ensuring reliability in thermally constrained LT3966EUJ#PBF deployments.
LT3966EUJ#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LT3966EUJ#PBF FAQ
1.How can I place an order for LT3966EUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3966EUJ#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 LT3966EUJ#PBF reliable?
The price and inventory of LT3966EUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3966EUJ#PBF is usually 5 days.
3.What payment methods are accepted for LT3966EUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3966EUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3966EUJ#PBF?
LT3966EUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3966EUJ#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 LT3966EUJ#PBF?
For technical support, including LT3966EUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3966EUJ#PBF requirements.
6.How does Aetrix verify that LT3966EUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LT3966EUJ#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 LT3966EUJ#PBF meets industry standards.
7.What is the process for return or replacement of LT3966EUJ#PBF?
All LT3966EUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3966EUJ#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 LT3966EUJ#PBF part is unused and in its original packaging.
Return procedure for LT3966EUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3966EUJ#PBF Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UW6-7
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