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Analog Devices Inc. LT3966EUJ#TRPBF
- Part No.:
- LT3966EUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT3966EUJ#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.6A 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,298
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Product details
Overview
LT3966EUJ#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 (8192:1) PWM dimming. It supports input voltages from 3V to 60V and delivers precise current regulation for high-brightness LED arrays in automotive HUDs and industrial backlighting.
For engineers reviewing the LT3966EUJ#TRPBF datasheet, LT3966EUJ#TRPBF pinout, LT3966EUJ#TRPBF application, or LT3966EUJ#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance in the 6mm × 6mm QFN package, and real-world dimming resolution metrics - all critical for automotive-grade LED system design and fault-resilient lighting control.
Technical Context
The LT3966EUJ#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 CRC-8 PEC error checking and programmable address selection via ADR1/ADR2 pins.
Onboard 8-bit ADC measures per-channel output voltage/current, VIN, die temperature, and two external analog inputs (EXT1/EXT2). Switching frequency is adjustable from 300kHz to 4MHz via RT resistor and supports multiphase operation for reduced input ripple - confirmed across –40°C to 125°C junction temperature range.
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 external pre-regulation. |
| Output Current per Channel | Up to 1.6A continuous - enables high-lumen LED strings with single-chip thermal management in 6mm × 6mm QFN. |
| PWM Dimming Resolution | 13-bit (8192:1) - ensures flicker-free, high-fidelity grayscale control for HUD and medical display applications. |
| ADC Channels & Resolution | 11-input, 8-bit - provides real-time monitoring of LED current/voltage, input supply, temperature, and two user-defined analog signals. |
| Switching Frequency Range | 300kHz to 4MHz - allows EMI optimization and inductor size reduction while maintaining stable current regulation. |
| Operating Junction Temp | –40°C to 125°C - qualified for under-hood automotive and industrial environments with thermal shutdown protection. |
| I²C Address Options | 8 configurable addresses via ADR1/ADR2 tri-state pins - enables multi-device bus scalability without address conflict. |
Pinout & Package
LT3966EUJ#TRPBF is housed in a thermally enhanced 40-lead plastic 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 gate drivers; requires local 4.7μF 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 up to 55V common-mode voltage per channel. |
| 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. |
| CTRL/PWM1–4 (Pins 11–14) | Analog/PWM dimming control inputs | Accept 0.2–1.2V analog or <100mV–1.5V PWM; define current setpoint and dimming mode per channel. |
| FB1–4 (Pins 39,32,10,21) | Output voltage feedback inputs | Regulate at 1.2V threshold; flag OPENLED (<10% current), SHORTLED (<0.3V), or OVFB (>1.26V). |
| SDA/SCL (Pins 18–19) | I²C bidirectional data/clock | 400kHz compliant with CRC-8 PEC; supports robust communication in noisy automotive environments. |
| ALERT (Pin 20) | Fault reporting output | Open-drain active-low signal indicating FB overvoltage, open/short LED, or overcurrent on any channel. |
| EN/UVLO (Pin 36) | Enable and undervoltage lockout | 1.23V falling threshold with 15mV hysteresis; enables precision input voltage turn-on sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| I²C programmable 13-bit PWM generator | Enables 8192-step grayscale control without external timing components - critical for color-accurate displays. |
| Per-channel shutdown and standby control | Allows dynamic topology reconfiguration (e.g., buck-boost hybrid) and power sequencing in multi-zone lighting systems. |
| Integrated 11-channel 8-bit ADC | Eliminates need for external monitoring ICs; measures LED current/voltage, input rail, die temp, and two user analog inputs. |
| High-side PMOS gate driver with fast turn-on/off | 50ns/60ns rise/fall time into 470pF load enables sub-microsecond LED disconnect during fault events. |
| Multiphase switching support | Reduces input ripple by interleaving four channels - lowers bulk capacitor requirements in space-constrained designs. |
| AEC-Q100 qualification in progress | Confirms suitability for automotive applications including heads-up displays and interior ambient lighting modules. |
Applications
| Automotive Heads-Up Display (HUD) | Industrial Backlighting |
|---|---|
Use Scenario: High-brightness RGB LED array projection onto windshield with real-time brightness adaptation. IC Role / Device Role / Timing Role: Quad-channel current regulator with synchronized PWM dimming and per-channel fault detection. Use Value: 13-bit dimming resolution ensures smooth luminance transitions; 60V output capability drives series-connected LEDs without cascaded stages. |
Use Scenario: Uniform edge-lit LCD backlight for factory HMIs requiring >10,000-hour reliability. IC Role / Device Role / Timing Role: Four independent boost controllers managing separate LED zones with thermal derating. Use Value: Integrated ADC monitors per-zone current and temperature, enabling closed-loop brightness compensation over lifetime. |
| Medical Imaging Displays | Avionics Cabin Lighting |
Use Scenario: DICOM-compliant diagnostic monitor backlight with strict grayscale fidelity and zero flicker. IC Role / Device Role / Timing Role: I²C-configured constant-current source with true-color PWM and fault-latched ALERT signaling. Use Value: 8192:1 dimming ratio meets clinical imaging contrast requirements; standalone mode (ADR pins grounded) enables fail-safe operation. |
Use Scenario: Redundant, dimmable cabin lighting with EMI-sensitive avionics co-location. IC Role / Device Role / Timing Role: Multiphase-switching LED driver minimizing conducted emissions on shared power rails. Use Value: 300kHz–4MHz adjustable frequency avoids interference with navigation band receivers; QFN package aids thermal compliance in sealed enclosures. |
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 | Triple-channel version (3× 1.6A boost); lacks fourth channel and one FB/ISP/ISN/TG set. | Suitable only for 3-zone lighting; cannot replace LT3966EUJ#TRPBF in 4-channel topologies without redesign. | Select when system requires exactly three independently controlled LED strings and board area is constrained. |
| MAX20051ATPA/VY+ | Quad-channel synchronous buck LED driver (not boost); max 42V input; no integrated ADC or I²C PWM generator. | Requires external microcontroller for dimming control; limited to lower-voltage LED strings (≤36V). | Choose for cost-sensitive, non-automotive applications where input voltage ≤42V and external MCU control is acceptable. |
Compared with LT3965EUJ#TRPBF and MAX20051ATPA/VY+, the LT3966EUJ#TRPBF uniquely combines 4-channel boost architecture, onboard 13-bit PWM generation, and 11-input ADC - eliminating external timing, monitoring, and control ICs in high-reliability automotive and medical lighting.
Availability
LT3966EUJ#TRPBF is available at Aetrix Electronics and suitable for automotive HUDs, industrial HMIs, and medical imaging displays requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LT3966EUJ#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3966EUJ#TRPBF belongs to Analog Devices' Power by Linear™ LED driver product line, engineered specifically for high-reliability, multi-channel LED lighting in safety-critical and thermally demanding environments.
FAQ
What is the maximum output voltage capability of the LT3966EUJ#TRPBF per channel?
The LT3966EUJ#TRPBF supports output voltages up to 60V per channel, enabled by its 60V-rated internal DMOS power switches and high-side current sensing architecture. This allows driving long series-connected LED strings without external voltage boosting stages - a key requirement for automotive HUD and large-format display backlighting where single-stage efficiency and compact layout are critical. The ISP–ISN differential voltage limit is 2V, and absolute ISP pin rating is 62V.
Does the LT3966EUJ#TRPBF support standalone operation without I²C communication?
Yes, the LT3966EUJ#TRPBF supports standalone mode when ADR1 and ADR2 pins are both tied to GND. In this configuration, all four channels power up immediately with soft-start, analog/PWM dimming controlled solely via CTRL/PWM pins, and fault reporting asserted on the ALERT pin - no I²C bus or host controller required. This mode is ideal for fail-safe lighting systems where deterministic behavior is mandatory.
How does the LT3966EUJ#TRPBF handle LED open-circuit faults?
The LT3966EUJ#TRPBF detects open LED conditions per channel when FB voltage reaches regulation (1.2V) while ISP–ISN current falls below 10% of full-scale - triggering an OPENLED flag and pulling the ALERT pin low. It autonomously disables the affected channel's switch and TG driver, preventing overvoltage stress. Fault status is readable via I²C register 0x0E, and latch-off behavior can be configured through the FAULTCTL register.
What is the purpose of the TG pins on the LT3966EUJ#TRPBF?
The TG1–TG4 pins on the LT3966EUJ#TRPBF are high-side PMOS gate drivers that deliver level-shifted, inverted PWM signals to external pass transistors. Each TG output swings between VISP (OFF) and VISP–8.2V (ON), enabling precise, fast LED current modulation and immediate output disconnect during overcurrent or open-LED faults - enhancing system safety and dimming fidelity beyond what the internal switch alone can provide.
Can the LT3966EUJ#TRPBF measure input voltage and temperature internally?
Yes, the LT3966EUJ#TRPBF's integrated 8-bit ADC measures chip input voltage (VIN) and die temperature as two of its 11 channels. VIN measurement uses an internal resistive divider; die temperature is derived from a calibrated bandgap sensor. Both values are accessible via I²C registers (0x10–0x11 for VIN, 0x12 for temperature), enabling real-time thermal derating and input rail monitoring without external components.
LT3966EUJ#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LT3966EUJ#TRPBF FAQ
1.How can I place an order for LT3966EUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3966EUJ#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 LT3966EUJ#TRPBF reliable?
The price and inventory of LT3966EUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3966EUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3966EUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3966EUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3966EUJ#TRPBF?
LT3966EUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3966EUJ#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 LT3966EUJ#TRPBF?
For technical support, including LT3966EUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3966EUJ#TRPBF requirements.
6.How does Aetrix verify that LT3966EUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3966EUJ#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 LT3966EUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3966EUJ#TRPBF?
All LT3966EUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3966EUJ#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 LT3966EUJ#TRPBF part is unused and in its original packaging.
Return procedure for LT3966EUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3966EUJ#TRPBF Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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LYT1604D-TL
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CL2N8-G
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Diodes Incorporated
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Diodes Incorporated
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