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Analog Devices Inc. LT3967JFE#TRPBF
- Part No.:
- LT3967JFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3967JFE#TRPBF.pdf
- Description:
- IC LED DRVR LIN PWM 1.3A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,474
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Product details
Overview
LT3967JFE#TRPBF from Analog Devices is an 8-channel LED bypass switching IC for precision dimming of high-voltage LED strings using a common current source. It integrates eight independent 15V/110mΩ NMOS switches, supports I²C-controlled PWM dimming (100–1000 Hz), provides open/shorted LED fault detection per channel, and operates with VIN up to 60V - enabling use in automotive headlight clusters and large RGBW displays.
For engineers reviewing the LT3967JFE#TRPBF datasheet, LT3967JFE#TRPBF pinout, LT3967JFE#TRPBF application, or LT3967JFE#TRPBF equivalent, key selection criteria include its 150°C junction-rated TSSOP-28 package, programmable 11-bit exponential fade timing, CRC-8 protected I²C interface, and per-channel fault reporting via ALERT pin - all critical for robust LED string management in safety-critical lighting systems.
Technical Context
The LT3967JFE#TRPBF implements a floating-source NMOS matrix architecture where each DRN/SRC pair forms a bidirectional bypass path across individual LEDs or segments. Its I²C interface uses address pins (ADDR1–ADDR4) to support up to 16 devices on one bus, with register-mapped control of PWM duty cycle, fade transition time, open/short LED thresholds, and watchdog timeout.
Fault handling is hardware-accelerated: open LED detection triggers automatic switch-on to maintain string continuity, while shorted LED detection preserves dimming operation. The internal oscillator (programmed via RTSYNC resistor) or external clock drives PWM at /2048 division, with fallback to 100 kHz standby mode if clock fails - ensuring fail-safe dimming behavior without MCU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 8 V to 60 V - powers switches and fault detectors; requires ≥6 V headroom above SRC voltage for reliable bypass operation. |
| Switch RDS(on) | 110 mΩ max at TJ = 150°C - enables low-loss current shunting with ≤1.3 A per channel, minimizing thermal stress in high-power LED strings. |
| PWM Dimming Range | 100 Hz to 1000 Hz (internal oscillator) - adjustable via RTSYNC resistor; divided by 2048 for final LED frequency, supporting smooth human-perceptible dimming. |
| Open LED Threshold | Programmable: 5.5–12.4 V (two levels per channel) - configurable per-channel detection window avoids false triggers in multi-LED segments with varying forward voltages. |
| Operating Junction Temp | –40°C to +150°C - J-grade qualification enables direct placement in under-hood automotive LED headlight modules without derating. |
| I²C Interface | Standard-mode (400 kHz), CRC-8 packet error checking - ensures robust command integrity in electrically noisy vehicle environments. |
| Watchdog Timeout | 15–20 ms (programmable via WDI capacitor) - resets registers and restores default switch states upon I²C communication failure, preventing stuck-on/stuck-off conditions. |
Pinout & Package
LT3967JFE#TRPBF is housed in a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed GND pad (Pin 29), θJA = 30°C/W. The package supports high-current routing and PCB-level thermal dissipation required for sustained 1.3A channel operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRN[1–8] | Floating NMOS drain terminal | Connects to LED+ side; withstands up to 60 V and 17 V transient overvoltage during switch turn-on. |
| SRC[1–8] | Floating NMOS source terminal | Connects to LED– side; must be ≥6 V below VIN for proper channel biasing and fault detection accuracy. |
| VIN | Main power input for switches & fault circuitry | Bypassed locally with ≥1 µF capacitor; supplies all eight channels and open/short LED comparators. |
| VDD | Digital logic & I²C supply | 2.7–5.5 V range; sets SCL/SDA logic thresholds; powers register bank and control logic independently of VIN. |
| ENH | Enable/UVLO input referenced to VIN | Triggers shutdown when VIN − ENH < 1.15 V; enables dimming/fault reporting only when ≥1.22 V differential is met. |
| SCL/SDA | I²C serial interface lines | Level-shifted to VDD; support multi-device addressing via ADDR[4:1]; include built-in hysteresis and CRC-8 validation. |
| ALERT | Open-drain fault indicator | Pulled low on open LED, shorted LED, overheat (≥170°C), or RTSYNC clock fault; deasserted after I²C status read or fault clearance. |
| RTSYNC | Oscillator programming / external clock input | Resistor-to-GND sets internal PWM clock (170–1130 Hz); external 200–2000 kHz clock overrides it; fallback to 100 kHz standby if lost. |
| WDI | Watchdog timer input | Capacitor-to-GND sets 15–20 ms timeout window; reset occurs on I²C START/STOP violation, restoring POR defaults and PWM clock source. |
| ADDR[1–4] | I²C address select & power-up state config | Set device address (010xxxxx or 101xxxxx) and define default ON/OFF state of all switches at VDD power-up via resistor values. |
Key Features
| Feature | Design Value |
|---|---|
| Eight independent 15V/110mΩ NMOS switches | Enables per-LED or per-segment bypass in strings up to 54 V, supporting flexible topology design without discrete MOSFETs or layout complexity. |
| Programmable 11-bit exponential fade transition | Provides perceptually linear brightness ramping between PWM states using logarithmic timing - eliminates visible stepping in high-resolution dimming applications. |
| CRC-8 protected I²C interface | Guarantees command integrity against EMI-induced bit errors in automotive or industrial lighting buses, reducing risk of unintended dimming or fault masking. |
| Per-channel open/short LED threshold programming | Allows independent configuration of fault detection windows (e.g., 5.5 V vs. 10.8 V open threshold) to match segment-specific VF tolerances and avoid nuisance trips. |
| Thermally enhanced TSSOP with exposed GND pad | Delivers 30°C/W junction-to-ambient thermal resistance - enables 1.3 A continuous channel current at 150°C ambient without external heatsinking in compact headlight modules. |
Applications
| Automotive LED Headlight Clusters | Large LED Displays |
|---|---|
|
Use Scenario: Adaptive driving beam (ADB) systems requiring independent dimming of multiple LED segments within a single headlight housing. IC Role / Device Role / Timing Role: Bypass switch controlling current path around individual LEDs or sub-strings powered by a constant-current buck driver (e.g., LT3932). Use Value: Enables pixel-level light shaping with <1.3 A per channel, 150°C operation, and automatic open-LED failover - meeting ASIL-B functional safety requirements without added redundancy. |
Use Scenario: High-brightness outdoor signage with long LED strings segmented for localized dimming and fault isolation. IC Role / Device Role / Timing Role: Fault-aware LED string manager interfacing with microcontroller over I²C to implement dynamic content-driven dimming profiles. Use Value: Reduces system-level fault diagnostics effort via per-channel open/short reporting and ALERT pin interrupt - cutting maintenance time for large-scale installations. |
| RGBW Color Mixing Lighting | Industrial Machine Vision Illumination |
|
Use Scenario: Tunable white and full-color architectural lighting where precise intensity matching across red, green, blue, and white channels is critical. IC Role / Device Role / Timing Role: Independent PWM dimmer for each color channel's LED string, synchronized via shared RTSYNC clock for flicker-free operation. Use Value: 11-bit exponential fade and 100–1000 Hz programmable frequency enable smooth CCT and hue transitions without visible stepping or audible noise. |
Use Scenario: Stroboscopic or high-speed inspection lighting requiring repeatable, jitter-free LED activation synchronized to camera trigger signals. IC Role / Device Role / Timing Role: Precision timing controller using external clock input (RTSYNC) to lock LED PWM edges to machine vision frame timing. Use Value: Sub-microsecond edge repeatability and watchdog-enforced register recovery ensure consistent illumination pulse width across thousands of cycles - critical for metrology-grade imaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED bypass switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3965EFE#TRPBF | Lower temperature grade (–40°C to 125°C), identical pinout and register map; lacks J-grade 150°C qualification. | Suitable for non-automotive indoor lighting or display applications where ambient temperature remains below 125°C junction. | Select LT3965EFE#TRPBF only when extended temperature operation is not required - reduces cost but forfeits under-hood viability. |
| TLC5940QPWPRQ1 | 16-channel constant-current LED driver (not bypass switch); no open/short LED detection; requires external current-setting resistors. | Used in low-voltage, low-power signage where per-LED current regulation is preferred over high-VIN bypass topologies. | Choose TLC5940QPWPRQ1 only for <20 V LED strings needing integrated current sinks - not a functional replacement for LT3967JFE#TRPBF's high-VIN bypass architecture. |
Compared with LT3965EFE#TRPBF, the LT3967JFE#TRPBF delivers guaranteed 150°C operation essential for automotive front lighting, while TLC5940QPWPRQ1 serves fundamentally different constant-current driver use cases - making LT3967JFE#TRPBF irreplaceable in high-reliability, high-voltage LED string bypass applications.
Availability
LT3967JFE#TRPBF is available at Aetrix Electronics and suitable for automotive LED headlight clusters, large-format outdoor displays, RGBW tunable lighting, and industrial machine vision illumination requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3967JFE#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.
The LT3967 product line was designed specifically for intelligent, fault-resilient LED string management in demanding environments - combining high-voltage switching, I²C configurability, and automotive-grade reliability in a single monolithic IC.
FAQ
What is the maximum LED string voltage supported by the LT3967JFE#TRPBF?
The LT3967JFE#TRPBF supports LED strings up to 54 V total, enabled by its 60 V absolute maximum VIN rating and per-channel 15 V drain-source voltage capability. Each DRN/SRC pair can safely bypass segments with up to 10.1 V forward drop, and the eight switches may be arranged in series or parallel configurations to distribute voltage stress across multiple channels - making LT3967JFE#TRPBF suitable for multi-string automotive headlight architectures.
How does the LT3967JFE#TRPBF handle an open LED fault?
When an open LED fault is detected - based on programmable thresholds (5.5–12.4 V) between DRN and SRC - the LT3967JFE#TRPBF automatically turns on the corresponding NMOS switch to bypass the faulty LED, maintaining string continuity and preventing system shutdown. The ALERT pin is asserted low, and the fault is logged in the read-only status register. PWM dimming for that channel halts until cleared via I²C command - ensuring safe, self-protecting operation in LT3967JFE#TRPBF-based lighting systems.
Can the LT3967JFE#TRPBF operate without an external microcontroller?
No - the LT3967JFE#TRPBF requires an I²C master (e.g., MCU or FPGA) for initialization, PWM configuration, fade timing setup, and fault status polling. While it includes an internal oscillator and watchdog, all functional control (channel enable/disable, dimming level, fault thresholds) is register-mapped and accessed exclusively via I²C commands. Standalone operation is not supported; the LT3967JFE#TRPBF functions strictly as a peripheral in a larger lighting control system.
What is the purpose of the ENH pin on the LT3967JFE#TRPBF?
The ENH pin on the LT3967JFE#TRPBF provides VIN-referenced undervoltage lockout (UVLO) and enable control. When the voltage difference between VIN and ENH falls below 1.15 V, the device enters shutdown mode - disabling PWM generation, fault reporting, and I²C response. This allows precise system-level power sequencing, such as enabling the LT3967JFE#TRPBF only after the main LED driver reaches regulation. ENH is typically connected via a resistor divider from VIN to set the exact turn-on threshold for LT3967JFE#TRPBF.
Does the LT3967JFE#TRPBF support daisy-chained I²C addressing?
No - the LT3967JFE#TRPBF does not support daisy-chaining. Instead, it uses four hardware address pins (ADDR1–ADDR4) to configure a unique 4-bit I²C address, allowing up to 16 devices on a single I²C bus with standard addressing (010xxxxx for write, 101xxxxx for read). Each LT3967JFE#TRPBF must have distinct resistor settings on its ADDR pins; no serial data forwarding or address translation is implemented - requiring parallel bus topology for multi-device systems.
LT3967JFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 0.88V
- Current - Output / Channel:
- 1.3A
- Frequency:
- 200kHz ~ 2MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3967JFE#TRPBF FAQ
1.How can I place an order for LT3967JFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3967JFE#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 LT3967JFE#TRPBF reliable?
The price and inventory of LT3967JFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3967JFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3967JFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3967JFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3967JFE#TRPBF?
LT3967JFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3967JFE#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 LT3967JFE#TRPBF?
For technical support, including LT3967JFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3967JFE#TRPBF requirements.
6.How does Aetrix verify that LT3967JFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3967JFE#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 LT3967JFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3967JFE#TRPBF?
All LT3967JFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3967JFE#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 LT3967JFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3967JFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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