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Texas Instruments TLC69668RTWR
- Part No.:
- TLC69668RTWR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
TLC69668RTWR.pdf
- Description:
- 128 MINI-LED MATRIX LOCAL DIMMIN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TLC69668RTWR from Texas Instruments is a 16-channel, 8-time-multiplexing local dimming LED driver optimized for high-contrast LCD backlight systems. It delivers 60mA per channel at up to 50V output compliance, with ±2% device-to-device and channel-to-channel current matching, and supports 15-bit brightness resolution via PWM/hybrid dimming control in TV, monitor, and notebook displays.
For engineers reviewing the TLC69668RTWR datasheet, TLC69668RTWR pinout, TLC69668RTWR application, or TLC69668RTWR equivalent, key selection criteria include its 60mA/50V constant-current sink capability, adaptive headroom voltage control (AHVC) for DC/DC optimization, daisy-chain interface up to 20MHz, integrated LED open/short and thermal shutdown diagnostics, and support for variable refresh rate (VRR) without flicker.
Technical Context
The TLC69668RTWR implements time-multiplexed local dimming using an internal 16× SRAM array for per-zone brightness storage and supports 8× time division to reduce required channel count while maintaining fine-grained dimming control. Its daisy-chain two-wire serial interface (CLK_I/SIN → SOUT/CLK_O) enables scalable deployment across >32,000 zones using up to 1024 devices.
Adaptive headroom voltage control (AHVC) dynamically adjusts the VLED supply by monitoring the FB pin of the last device in the chain, minimizing power loss in external DC/DC converters. Diagnostics include per-channel LED open/short detection and thermal shutdown, with readback options via UART/INT or two-wire SOUT/CLK_O outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 constant-current sinks for independent LED zone control |
| Max output current / voltage | 60mA per channel at up to 50V compliance - enables high-brightness, high-Vf LED strings |
| Current accuracy | ±2% device-to-device and channel-to-channel error - ensures uniform luminance across zones |
| Brightness resolution | Up to 15-bit PWM/hybrid dimming - supports deep black levels and smooth gradation |
| Data rate | Up to 20MHz daisy-chain serial interface - reduces frame update latency for VRR |
| Supply voltage | 3V to 5.5V VCC - compatible with standard logic and system rails |
| Power consumption | ≤3.5mA in normal mode; ≤200μA in standby - minimizes system-level idle power |
Pinout & Package
Package: WQFN-24 (RTW), 4mm × 4mm body, 0.5mm pitch, exposed thermal pad (Pin 25). RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3V–5.5V main logic and bias rail for internal circuitry |
| GND | Ground reference | Common return path for all analog/digital functions and current sinks |
| CLK_I | Serial clock input | Accepts master clock signal for synchronous data latching in daisy chain |
| SIN | Serial data input | Receives configuration and brightness data from upstream device or controller |
| SOUT | Serial data output | Drives downstream device with shifted-out register contents for daisy chaining |
| CLK_O | Serial clock output | Passes synchronized CLK_I to next device; enables multi-device timing alignment |
| FB | Feedback input | Connects only to last device's FB pin to regulate VLED headroom via external DC/DC |
| OUT0–OUT15 | Constant-current outputs | 16 high-side current sinks driving LED cathodes; each supports 60mA/50V |
| INT | Interrupt output | Active-low open-drain flag signaling LOD, LSD, or TSD fault conditions |
| VLED | LED anode supply | High-voltage rail (up to 50V) supplied externally to LED string anodes |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive headroom voltage control (AHVC) | Reduces VLED overhead by dynamically adjusting DC/DC output based on worst-case OUTx forward voltage - cuts power loss and heat in backlight subsystem |
| Programmable black insertion | Inserts controlled dark frames between active video frames to enhance perceived contrast ratio without motion blur artifacts |
| Variable refresh rate (VRR) support | Enables flicker-free dimming updates during dynamic frame-rate changes - critical for gaming and adaptive sync displays |
| Per-zone LED diagnostics | Detects open-circuit (LOD) and short-circuit (LSD) faults on each of 16 outputs, plus thermal shutdown (TSD), reported via UART or INT/SOUT |
| Minimum brightness update latency | Optimized register pipeline and daisy-chain handshaking ensure sub-frame latency for real-time dimming updates |
Applications
| TV Local Dimming System | Professional Monitor Backlight |
|---|---|
|
Use Scenario: High-end 4K/8K LCD TVs requiring >1000 local dimming zones for HDR contrast enhancement. IC Role / Device Role / Timing Role: Primary 16-channel LED driver in 8× time-multiplexed architecture, cascaded across multiple PCBs to achieve zone scalability. Use Value: Delivers 60mA/50V drive capability and ±2% current matching to maintain uniform peak brightness and deep blacks across full screen. |
Use Scenario: Color-accurate medical and broadcast monitors demanding stable, flicker-free backlighting under variable frame rates. IC Role / Device Role / Timing Role: Local dimming controller synchronizing with display timing controller (TCON) via daisy-chain interface for precise VRR-aligned updates. Use Value: Enables flicker-free variable refresh rate operation and programmable black insertion to improve contrast perception without motion artifacts. |
| Notebook Display Backlight | Tablet HDR Panel Control |
|
Use Scenario: Thin-bezel ultrabook displays where thermal and power efficiency constrain backlight subsystem design. IC Role / Device Role / Timing Role: Integrated LED driver managing 16 edge-lit or mini-LED zones with ultra-low standby current (≤200μA). Use Value: AHVC minimizes VLED headroom, reducing DC/DC losses; low ICC in normal mode (<3.5mA) extends battery life during video playback. |
Use Scenario: Portable HDR tablets requiring robust fault detection and compact form factor for consumer-grade reliability. IC Role / Device Role / Timing Role: Fault-aware local dimming IC reporting LED open/short and thermal events via INT pin to system MCU. Use Value: Per-channel diagnostics prevent localized backlight failure from degrading user experience; WQFN-24 package fits tight layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC69664RTWR | Same 16-channel WQFN-24 package but rated for 60mA/20V output compliance - lower Vf LED string support | Suitable for low-Vf edge-lit or direct-lit panels where 50V headroom is unnecessary | Select when system VLED < 25V and cost-sensitive scaling is prioritized over high-Vf flexibility |
| TLC69658RTWR | Same 16-channel WQFN-24 package with 30mA/50V rating - half the max current, identical voltage range | Applicable where lower per-zone brightness suffices and thermal density must be reduced | Choose when thermal budget limits average current per zone and 30mA meets luminance targets |
Compared with TLC69664RTWR and TLC69658RTWR, the TLC69668RTWR uniquely combines 60mA drive strength with 50V compliance - enabling fewer parallel strings and higher-efficiency operation in high-brightness, high-Vf mini-LED backlights without sacrificing diagnostic coverage or VRR fidelity.
Availability
TLC69668RTWR is available at Aetrix Electronics and suitable for TV, professional monitor, and notebook backlight designs requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and consumer OEM programs.
Supply support for TLC69668RTWR 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and power efficiency.
The TLC696xx family is designed specifically for LCD local dimming backlight systems, targeting high-dynamic-range (HDR) displays that demand precise per-zone current control, low-latency updates, and integrated fault diagnostics.
FAQ
What is the maximum LED string voltage supported by the TLC69668RTWR?
The TLC69668RTWR supports up to 50V output compliance per channel, allowing it to drive high-forward-voltage LED strings common in mini-LED and high-brightness edge-lit backlights. This 50V rating is confirmed in the official datasheet's "Maximum Output Current / Voltage" specification for the TLC6966x series, and applies directly to the TLC69668RTWR variant.
Does the TLC69668RTWR support daisy-chaining, and what is the maximum data rate?
Yes, the TLC69668RTWR supports daisy-chain topology using dedicated CLK_I/SIN inputs and CLK_O/SOUT outputs. It operates at up to 20MHz serial data transfer rate, enabling fast frame updates essential for variable refresh rate (VRR) and low-latency local dimming in modern displays.
How does adaptive headroom voltage control (AHVC) work in the TLC69668RTWR?
AHVC in the TLC69668RTWR monitors the FB pin of the final device in a daisy chain to dynamically adjust the external DC/DC converter's output voltage. This minimizes excess VLED headroom across all channels, reducing power dissipation and heat generation without compromising LED drive capability.
What diagnostic functions does the TLC69668RTWR provide, and how are they reported?
The TLC69668RTWR provides per-channel LED open detection (LOD), LED short detection (LSD), and device thermal shutdown detection (TSD). These faults are reported either through the open-drain INT pin or via serial readback using the UART interface or two-wire SOUT/CLK_O outputs - both configurable via internal registers.
Is the TLC69668RTWR pin-compatible with other members of the TLC696xx family?
Yes, the TLC69668RTWR shares the same WQFN-24 (RTW) package footprint and pinout with all other TLC696xx variants offered in the RTW package, including TLC69664RTWR and TLC69658RTWR. This allows layout reuse across different current/voltage configurations within the same design platform.
TLC69668RTWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TLC696x8
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Constant Current
- Internal Switch(s):
- No
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 50V
- Current - Output / Channel:
- 60mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
TLC69668RTWR FAQ
1.How can I place an order for TLC69668RTWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC69668RTWR 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 TLC69668RTWR reliable?
The price and inventory of TLC69668RTWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC69668RTWR is usually 5 days.
3.What payment methods are accepted for TLC69668RTWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC69668RTWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC69668RTWR?
TLC69668RTWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC69668RTWR 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 TLC69668RTWR?
For technical support, including TLC69668RTWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC69668RTWR requirements.
6.How does Aetrix verify that TLC69668RTWR is sourced from the original manufacturer or authorized distributors?
All TLC69668RTWR 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 TLC69668RTWR meets industry standards.
7.What is the process for return or replacement of TLC69668RTWR?
All TLC69668RTWR units undergo pre-shipment inspection (PSI). If there is an issue with TLC69668RTWR, 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 TLC69668RTWR part is unused and in its original packaging.
Return procedure for TLC69668RTWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC69668RTWR Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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