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Analog Devices Inc. LT3967EFE#TRPBF
- Part No.:
- LT3967EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3967EFE#TRPBF.pdf
- Description:
- IC LED DRVR LIN PWM 1.3A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,813
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Product details
Overview
LT3967EFE#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 (256:1 resolution), 11-bit exponential fade, open/shorted LED fault detection, and operates with VIN up to 60V and VDD from 2.7V to 5.5V - deployed in automotive headlight clusters requiring per-LED fault resilience and smooth intensity transitions.
For engineers reviewing the LT3967EFE#TRPBF datasheet, LT3967EFE#TRPBF pinout, LT3967EFE#TRPBF application, or LT3967EFE#TRPBF equivalent, key selection considerations include channel-independent fade programming, programmable VOTH/VSTH thresholds (5.5–11.5V / 1–4V), thermal shutdown at 170°C, watchdog timer with 15–20ms timeout, and TSSOP-28 thermally enhanced package with exposed GND pad.
Technical Context
The LT3967EFE#TRPBF implements a floating-source NMOS matrix architecture where each DRN/SRC pair forms a bidirectional bypass path across individual LEDs in a series string. Its I²C interface uses CRC-8 packet error checking and supports up to 16 devices on one bus via four address pins (ADDR1–ADDR4), enabling scalable multi-device lighting systems without bus contention.
Internal PWM generation is programmable via RTSYNC resistor (10kΩ–80.6kΩ) yielding 100–1130Hz dimming frequency (÷2048 division), while external clock input allows synchronization to system timing. Fault reporting includes per-channel open LED (VOTH-selectable thresholds), shorted LED (VSTH-selectable), overheat (≥170°C), and RTSYNC clock loss - all asserted via open-drain ALERT pin with ARA support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Operating Range | 8V to 60V - supports high-side LED strings powered by buck drivers up to 54V total string voltage. |
| Switch On-Resistance | 110mΩ max - enables low-loss bypass of up to 1.3A per channel without significant self-heating. |
| PWM Dimming Resolution | 256:1 (8-bit) - provides fine-grained brightness control suitable for automotive ambient and DRL applications. |
| Fade Transition Precision | 11-bit exponential - delivers perceptually linear intensity ramps with programmable time (100–1000ms range). |
| Open LED Threshold | Selectable 5.5V/6.1V or 10.8V/11.4V - ensures reliable fault detection across varying LED forward voltages and temperature drift. |
| Shorted LED Threshold | Selectable 1V or 4V - discriminates between single- and multi-LED short faults in segmented strings. |
| Operating Junction Temp | –40°C to +125°C - qualified for under-hood automotive environments per LT3967E grade. |
Pinout & Package
LT3967EFE#TRPBF is housed in a 28-lead plastic TSSOP (FE package) with exposed thermal pad (Pin 29 = GND), θJA = 30°C/W. The package requires soldering the exposed pad directly to PCB ground plane for thermal integrity and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRN1–DRN8 | Floating NMOS drain terminals | Connect to LED+ side; withstands up to 60V and supports parallel/series switch configurations. |
| SRC1–SRC8 | Floating NMOS source terminals | Connect to LED– side; must be ≥6V below VIN for proper switch operation and fault sensing. |
| VIN | Main power input for switches & fault detectors | Bypassed locally with ≥1µF capacitor; powers internal protection circuitry and switch drivers. |
| VDD | I²C logic supply (2.7–5.5V) | Sets SCL/SDA logic levels; decoupled with ≥0.1µF capacitor; enables I²C interface above 2.5V. |
| ENH | Enable/UVLO input referenced to VIN | Triggers shutdown when VIN–ENH < 1.15V; threshold hysteresis = 50mV for noise immunity. |
| SCL/SDA | I²C serial interface lines | Level-shifted to VDD; support 400kHz standard-mode; include built-in CRC-8 error checking. |
| ADDR1–ADDR4 | Device address & power-up state select | Set I²C address (010xxxxx or 101xxxxx) and default switch state (ON/OFF) via resistor ties to GND/VDD. |
| ALERT | Open-drain fault indicator | Pulled low on open LED, shorted LED, overheat (≥170°C), or RTSYNC clock fault; supports ARA protocol. |
| RTSYNC | Internal oscillator programming / external clock input | Resistor-to-GND sets PWM frequency; external clock overrides internal oscillator if driven between RTVIL/RTVIH. |
| WDI | Watchdog timer input | Capacitor-to-GND sets 15–20ms timeout; reset occurs on I²C inactivity, VDD POR, or BCMODE write. |
Key Features
| Feature | Design Value |
|---|---|
| Eight independent 15V/110mΩ NMOS switches | Enables per-LED bypass in multi-string architectures without shared current-path limitations. |
| I²C interface with CRC-8 packet validation | Prevents register corruption from bus noise in electrically noisy automotive environments. |
| Programmable open/short LED fault thresholds | Allows adaptation to varying LED Vf tolerances and aging effects across production batches. |
| 11-bit exponential fade with user-defined timing | Eliminates visible stepping during brightness transitions in human-visible lighting zones. |
| Thermally enhanced TSSOP with exposed GND pad | Supports continuous 1.3A/channel operation at junction temperatures up to 125°C with proper PCB layout. |
Applications
| Automotive LED Headlight Clusters | Large LED Displays |
|---|---|
|
Use Scenario: Adaptive driving beam (ADB) systems requiring independent dimming of 16–64 LED segments per headlight module. IC Role / Device Role / Timing Role: Bypass switch controller managing current redistribution around failed or dynamically dimmed LEDs in constant-current string topology. Use Value: Maintains full string continuity during single-LED failure while enabling pixel-level intensity control via I²C with CRC-8 reliability. |
Use Scenario: Outdoor stadium signage with long LED strings powered by centralized buck drivers. IC Role / Device Role / Timing Role: Fault-tolerant dimming node providing open/short LED detection and fade-synchronized brightness updates across hundreds of channels. Use Value: Reduces maintenance downtime via early fault identification and preserves display uniformity through per-segment fade calibration. |
| RGBW Color Mixing Lighting | Industrial Machine Vision Illumination |
|
Use Scenario: High-CRI architectural lighting systems blending red, green, blue, and white LEDs for tunable white point and hue control. IC Role / Device Role / Timing Role: Independent channel driver enabling synchronized 11-bit exponential fade across color channels to avoid hue shift during dimming. Use Value: Achieves flicker-free, perceptually linear dimming with <±1% color point deviation across 0.1–100% intensity range. |
Use Scenario: High-speed inspection systems requiring strobed, precisely timed illumination pulses synchronized to camera exposure. IC Role / Device Role / Timing Role: PWM dimming engine with external clock input (RTSYNC) enabling sub-microsecond edge alignment to trigger signals. Use Value: Enables <1µs jitter in LED turn-on/turn-off edges, critical for motion-blur-free imaging at >10k fps. |
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 | 4-channel version; identical 110mΩ RDS(on), same VDD/VIN ranges, but lacks fade transition and has no RTSYNC clock input. | Suitable only for simpler strings with ≤4 independently controlled segments; cannot replace LT3967EFE#TRPBF where fade or external sync is required. | Select when channel count and feature set are reduced, and cost optimization outweighs fade/sync needs. |
| TLC59401PWP | 16-channel constant-current LED driver (not bypass switch); 12-bit PWM, no open/short LED detection, max 17V output. | Requires redesign from constant-current string + bypass topology to constant-current sink architecture; incompatible with high-VIN (>17V) strings. | Consider only for new designs targeting lower voltage (<17V), higher channel density, and no fault-bypass requirements. |
Compared with LT3965EFE#TRPBF and TLC59401PWP, the LT3967EFE#TRPBF uniquely combines 8-channel floating-source bypass switching, per-channel fade programming, and robust fault reporting in a single 60V-capable device - making it irreplaceable in ADB and fault-critical high-voltage LED systems.
Availability
LT3967EFE#TRPBF is available at Aetrix Electronics and suitable for automotive LED headlight clusters, large-format outdoor displays, RGBW tunable-white lighting, and industrial machine vision illumination requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-aligned performance.
Supply support for LT3967EFE#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 industrial, automotive, communications, and healthcare markets.
The LT3967EFE#TRPBF belongs to Analog Devices' LED Power Management product line, designed specifically for fault-resilient, high-voltage LED string control in safety-critical automotive and commercial lighting applications.
FAQ
What is the maximum LED string voltage supported by the LT3967EFE#TRPBF?
The LT3967EFE#TRPBF supports LED strings up to 54V, enabled by its 60V absolute maximum VIN rating and 15V-rated NMOS switches operating in floating-source configuration. Each DRN/SRC pair handles up to 15V differential, and series/parallel switch arrangements allow safe bypass of high-voltage segments without exceeding channel limits - verified in the Typical Application circuit with LT3932 buck driver outputting up to 36V.
Does the LT3967EFE#TRPBF require an external microcontroller to operate?
Yes, the LT3967EFE#TRPBF requires an external microcontroller for I²C initialization and runtime control. It has no autonomous operation mode: all channel states (ON/OFF/PWM/fade), fault thresholds (VOTH/VSTH), watchdog settings, and address configuration must be written via I²C commands. However, once configured, it maintains state through power cycles if ADDR pins define non-volatile power-up defaults.
How does the LT3967EFE#TRPBF handle an open LED fault?
When an open LED fault is detected - determined by DRN–SRC voltage exceeding the programmed VOTH threshold (e.g., 6.1V or 11.4V) - the LT3967EFE#TRPBF automatically turns on the corresponding NMOS switch to bypass the faulty LED, maintaining string continuity. The channel's PWM dimming halts, and the ALERT pin is pulled low. The fault status remains latched until cleared by an I²C write command to the FAULT register.
Can the LT3967EFE#TRPBF synchronize its PWM dimming to an external clock?
Yes, the LT3967EFE#TRPBF supports external synchronization via the RTSYNC pin. When driven with a clean square wave between RTVIL (0.4V) and RTVIH (1.5V) at 200–2000kHz, the internal PWM generator locks to the external clock divided by 2048. This enables precise inter-device timing alignment in multi-chip LED systems - a capability not available in the pin-compatible LT3965EFE#TRPBF.
What thermal management is required for the LT3967EFE#TRPBF in continuous 1.3A operation?
For continuous 1.3A per channel at 125°C junction temperature, the LT3967EFE#TRPBF requires the exposed pad (Pin 29) to be soldered to a minimum 200mm² copper area connected to internal/external ground planes. Thermal resistance θJA is specified at 30°C/W with this layout; insufficient copper or missing thermal vias will cause junction temperature to exceed 125°C, triggering thermal shutdown at 170°C and degrading long-term reliability.
LT3967EFE#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3967EFE#TRPBF FAQ
1.How can I place an order for LT3967EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3967EFE#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 LT3967EFE#TRPBF reliable?
The price and inventory of LT3967EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3967EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3967EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3967EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3967EFE#TRPBF?
LT3967EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3967EFE#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 LT3967EFE#TRPBF?
For technical support, including LT3967EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3967EFE#TRPBF requirements.
6.How does Aetrix verify that LT3967EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3967EFE#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 LT3967EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3967EFE#TRPBF?
All LT3967EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3967EFE#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 LT3967EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3967EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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