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Texas Instruments TLC69661RTWR
- Part No.:
- TLC69661RTWR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
TLC69661RTWR.pdf
- Description:
- MINI-LED LOCAL DIMMING BACKLIGHT
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
TLC69661RTWR from Texas Instruments is a 16-channel constant-current LED sink driver optimized for LCD local dimming backlight systems, delivering 60mA per channel at up to 50V output compliance, ±2% device-to-device and channel-to-channel current matching, and 15-bit brightness resolution for high-fidelity display control in TV and monitor applications.
For engineers reviewing the TLC69661RTWR datasheet, TLC69661RTWR pinout, TLC69661RTWR application, or TLC69661RTWR equivalent, key selection considerations include its WQFN-24 package with exposed thermal pad, adaptive headroom voltage control (AHVC) interface to DC/DC converters, daisy-chainable 20MHz two-wire serial interface, and integrated LED open/short and thermal shutdown diagnostics.
Technical Context
The TLC69661RTWR implements a daisy-chainable two-wire serial interface (CLK_I/SIN/SOUT/CLK_O) supporting up to 1024 devices for 16,000-zone local dimming systems, with programmable interface drive strength and four integrated phase-shifting schemes to reduce EMI. Its adaptive headroom voltage control (AHVC) directly regulates external DC/DC converters via the FB pin of the last device in chain.
Each of the 16 channels operates as a precision constant-current sink with independent 15-bit PWM/hybrid dimming control, global 8-bit maximum current setting, and real-time diagnostic reporting via UART/INT or two-wire SOUT/CLK_O outputs - enabling rapid fault isolation in large-area backlight arrays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3V to 5.5V - supports direct connection to standard logic supply rails without level-shifting. |
| Output Current / Compliance | 60mA / 50V - enables driving high-Vf LED strings (e.g., 12–15 white LEDs in series) with margin. |
| Current Matching | ±2% (typ.) device-to-device and channel-to-channel - ensures uniform luminance across dimming zones without per-channel calibration. |
| Brightness Resolution | Up to 15-bit - provides >32,000 grayscale steps for smooth black-level transitions and reduced contouring artifacts. |
| Data Rate | Up to 20MHz - allows full 16-channel update in <1µs, minimizing brightness update latency for VRR and black insertion. |
| Power Consumption | ≤3.5mA (normal), ≤200µA (standby) - reduces system-level thermal load and enables low-power display modes. |
| Diagnostic Coverage | Per-zone LED open/short detection + thermal shutdown - enables automated fault recovery and predictive maintenance in commercial displays. |
Pinout & Package
Package: WQFN-24 (RTW), 4mm × 4mm body, 0.5mm pitch, exposed thermal pad (Pin 25), moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | 3V–5.5V logic and internal bias supply; decoupling required near pin. |
| GND | Ground reference | Analog/digital ground common point; connects to exposed thermal pad for thermal and electrical integrity. |
| CLK_I | Clock input | Accepts 1.8V/3.3V-compatible clock signal for synchronous daisy-chain data latching. |
| SIN | Serial data input | Receives configuration and brightness data from upstream device or host controller. |
| SOUT | Serial data output | Drives downstream device in daisy chain; supports readback diagnostics in two-wire mode. |
| CLK_O | Clock output | Propagates synchronized clock to next device; enables precise timing alignment across long chains. |
| FB | Feedback input | Connects only to last device's FB pin to regulate DC/DC converter output voltage based on worst-case channel headroom. |
| OUT0–OUT15 | Constant-current sinks | 16 high-side referenced current outputs; each drives cathode of LED string with 60mA/50V capability. |
| INT | Interrupt output | Active-low open-drain flag signaling LED fault or thermal shutdown; configurable per zone. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Headroom Voltage Control (AHVC) | Reduces DC/DC output voltage to minimum required for highest-output channel, cutting power loss by up to 30% vs fixed-headroom designs. |
| Programmable Black Insertion | Inserts precise dark frames between refresh cycles to eliminate motion blur without requiring panel-level hardware changes. |
| Variable Refresh Rate (VRR) Support | Maintains flicker-free dimming across 48–144Hz refresh rates via synchronized PWM timing, critical for gaming and video playback. |
| Dual Diagnostic Readback Modes | UART/INT or SOUT/CLK_O selection allows flexible integration with existing MCU interfaces-no additional UART peripheral required if using two-wire mode. |
| EMI Optimization | Four programmable phase-shifting schemes and adjustable drive strength suppress narrowband emissions at fundamental and harmonic frequencies. |
Applications
| TV Local Dimming | Monitor Backlight Control |
|---|---|
Use Scenario: High-end 4K/8K LCD TVs implementing full-array local dimming with >1000 zones. IC Role / Device Role / Timing Role: Primary 16-channel current sink per dimming zone, daisy-chained for scalability and synchronized PWM timing. Use Value: Enables deep black levels (0.001 cd/m²) and >1,000,000:1 contrast ratio while maintaining color fidelity across dynamic scenes. |
Use Scenario: Professional-grade monitors for design and video editing requiring precise luminance uniformity. IC Role / Device Role / Timing Role: Zone-specific current regulation with 15-bit dimming resolution and sub-microsecond update latency. Use Value: Eliminates visible banding and contouring during gradient rendering, meeting ISO 3664 graphic arts display standards. |
| Notebook Display Backlight | Tablet Adaptive Brightness |
Use Scenario: Thin-bezel ultrabooks with edge-lit or mini-LED backlights constrained by thermal envelope. IC Role / Device Role / Timing Role: Low-quiescent-current (≤3.5mA) LED driver with AHVC to minimize DC/DC losses and heat generation. Use Value: Extends battery life by >12% during HDR video playback versus fixed-headroom drivers, verified at 350 nits typical brightness. |
Use Scenario: Consumer tablets using ambient light sensing to dynamically adjust local dimming intensity. IC Role / Device Role / Timing Role: Fast-response current sink with programmable black insertion for motion clarity during UI navigation. Use Value: Reduces perceived motion blur by 40% in scrolling interfaces without increasing frame buffer bandwidth or SoC load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC69651RTWR | 30mA/50V output capability, identical pinout and interface | Lower current rating limits use to fewer LEDs per string or lower-brightness panels | Select when system requires ≤30mA per channel and prioritizes cost over peak brightness headroom. |
| TLC69611RTWR | 60mA/20V output compliance, same 15-bit dimming and AHVC features | 20V max compliance restricts to ≤6–7 white LEDs in series; unsuitable for high-Vf mini-LED arrays | Choose for compact displays where board space limits DC/DC voltage and thermal management is less constrained. |
Compared with TLC69651RTWR and TLC69611RTWR, the TLC69661RTWR uniquely combines 60mA drive strength with 50V compliance - enabling single-chip support for high-density mini-LED backlighting in premium TVs and monitors without cascading drivers or derating.
Availability
TLC69661RTWR is available at Aetrix Electronics and suitable for TV local dimming, professional monitor backlighting, and notebook mini-LED display applications requiring stable component supply, long-term production continuity, and automotive-qualified alternatives (TLC69661-Q1) for extended temperature operation.
Supply support for TLC69661RTWR 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 company designing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer applications.
The TLC696x1 product line was developed specifically for high-channel-count LCD local dimming systems, emphasizing precision current matching, low-latency update architecture, and system-level power optimization through adaptive headroom control.
FAQ
What is the maximum LED string voltage supported by the TLC69661RTWR?
The TLC69661RTWR supports up to 50V output compliance per channel, allowing it to drive LED strings with total forward voltage up to 50V - typically 12–15 standard white LEDs (3.2–3.6V each) in series under worst-case conditions. This rating is confirmed in the official datasheet SLVSHB7 section "16 constant current sinks" and applies specifically to the TLC69661RTWR variant.
Does the TLC69661RTWR require an external microcontroller to configure its dimming parameters?
No - the TLC69661RTWR includes embedded SRAM for brightness storage and accepts configuration via its daisy-chainable two-wire interface (CLK_I/SIN), eliminating need for persistent MCU intervention after initialization. Host systems can write 15-bit brightness values and global settings directly; the TLC69661RTWR maintains state autonomously during operation.
How does the adaptive headroom voltage control (AHVC) function in the TLC69661RTWR improve system efficiency?
AHVC in the TLC69661RTWR dynamically adjusts the DC/DC converter output voltage to match the highest required headroom among all 16 channels - reducing excess voltage drop across current sinks. This cuts conduction losses by up to 30% versus fixed-headroom designs, directly lowering power dissipation and thermal load in the backlight subsystem.
Can multiple TLC69661RTWR devices be connected in series, and what is the maximum chain length?
Yes - the TLC69661RTWR supports daisy-chain topology using CLK_I/SIN/SOUT/CLK_O pins, with documented support for up to 1024 devices in a single chain. This enables control of 16,000 local dimming zones using one host interface, verified in the datasheet description and functional block diagram of the TLC69661RTWR.
What diagnostic capabilities does the TLC69661RTWR provide for LED fault detection?
The TLC69661RTWR integrates per-channel LED open and short detection plus thermal shutdown monitoring. Fault status is reported either via dedicated INT pin (active-low open-drain) or two-wire SOUT/CLK_O readback - enabling real-time zone-level health monitoring without interrupting display operation.
TLC69661RTWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TLC696x1
- 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)
TLC69661RTWR FAQ
1.How can I place an order for TLC69661RTWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC69661RTWR 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 TLC69661RTWR reliable?
The price and inventory of TLC69661RTWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC69661RTWR is usually 5 days.
3.What payment methods are accepted for TLC69661RTWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC69661RTWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC69661RTWR?
TLC69661RTWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC69661RTWR 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 TLC69661RTWR?
For technical support, including TLC69661RTWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC69661RTWR requirements.
6.How does Aetrix verify that TLC69661RTWR is sourced from the original manufacturer or authorized distributors?
All TLC69661RTWR 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 TLC69661RTWR meets industry standards.
7.What is the process for return or replacement of TLC69661RTWR?
All TLC69661RTWR units undergo pre-shipment inspection (PSI). If there is an issue with TLC69661RTWR, 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 TLC69661RTWR part is unused and in its original packaging.
Return procedure for TLC69661RTWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC69661RTWR Tags
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BCR420UE6433HTMA1
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HV9910CLG-G
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CL2N8-G
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BCR420UFD-7
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