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Texas Instruments TLC69651RTWR
- Part No.:
- TLC69651RTWR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
TLC69651RTWR.pdf
- Description:
- LOCAL DIMMING MINI-LED BACKLIGHT
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TLC69651RTWR from Texas Instruments is a 16-channel constant-current LED sink driver optimized for LCD local dimming backlight systems, delivering 30mA per channel with up to 50V compliance voltage, ±2% (typ.) channel-to-channel current matching, and 15-bit brightness resolution for high-fidelity display control in TV and monitor applications.
For engineers reviewing the TLC69651RTWR datasheet, TLC69651RTWR pinout, TLC69651RTWR application, or TLC69651RTWR equivalent, key selection criteria include its 50V output capability, adaptive headroom voltage control (AHVC), daisy-chain interface supporting up to 1024 devices, UART/INT and SOUT/CLK_O diagnostic reporting options, and WQFN-24 package with exposed thermal pad.
Technical Context
The TLC69651RTWR implements a daisy-chainable two-wire serial interface (CLK_I/SIN input, CLK_O/SOUT output) operating at up to 20MHz, compatible with 1.8V and 3.3V logic levels. It integrates SRAM per channel for independent brightness storage and supports hybrid PWM/current-control dimming modes.
Its adaptive headroom voltage control (AHVC) dynamically adjusts the DC/DC converter's feedback reference using only the FB pin of the last device in the chain, reducing system component count and layout complexity. Diagnostics include per-zone LED open/short detection and thermal shutdown, reported via programmable UART/INT or two-wire SOUT/CLK_O outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3V to 5.5V - Enables direct integration with standard logic supply rails without external regulators. |
| Max Output Current / Voltage | 30mA / 50V - Supports high-voltage LED strings common in large-panel local dimming zones. |
| Current Matching | ±2% (typ.) channel-to-channel - Ensures uniform luminance across all 16 dimming zones without per-channel calibration. |
| Brightness Resolution | Up to 15-bit - Delivers >32,000 grayscale steps for smooth black-level transitions and reduced contouring artifacts. |
| Interface Speed | Up to 20MHz daisy-chain clock - Enables full 16-channel update in <1µs, critical for VRR and black insertion timing. |
| Power Consumption | ≤3.5mA (normal), ≤200µA (standby) - Minimizes thermal load and power budget impact in multi-device backlight stacks. |
| Diagnostic Reporting | UART/INT or SOUT/CLK_O selectable - Allows flexible integration with host MCU interrupt handling or serial debug infrastructure. |
Pinout & Package
Package: WQFN-24 (RTW), 4mm × 4mm body, 0.5mm pitch, exposed thermal pad (Pin 25). RoHS-compliant, NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply Input | Primary power rail (3–5.5V) for internal logic and gate drivers; decoupling required near pin. |
| GND | Ground Reference | Analog/digital ground return; tied to exposed thermal pad for thermal and EMI performance. |
| CLK_I | Clock Input | Master clock input for daisy-chain synchronization; accepts 1.8V/3.3V logic levels. |
| SIN | Serial Data Input | Input for configuration and brightness data; latched on rising CLK_I edge. |
| CLK_O | Clock Output | Pass-through clock for next device in daisy chain; enables scalable multi-device timing. |
| SOUT | Serial Data Output | Diagnostic readback output (LED fault, TSD) or daisy-chain data forwarding. |
| FB | Feedback Input | Only used on final device in chain; connects to DC/DC converter feedback node for AHVC. |
| OUT0–OUT15 | Constant-Current Sinks | 16 high-side referenced current outputs; each drives cathode of LED string to GND. |
| INT | Interrupt Output | Active-low open-drain flag signaling LOD, LSD, or TSD events when UART mode disabled. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Headroom Voltage Control (AHVC) | Reduces DC/DC output voltage to minimum required for LED string forward drop + margin, cutting system power loss by up to 30% vs fixed-headroom designs. |
| Programmable Black Insertion | Inserts precise black frames between refresh cycles to eliminate motion blur without requiring panel-level hardware changes. |
| Variable Refresh Rate (VRR) Support | Maintains flicker-free dimming during dynamic frame rate changes by synchronizing PWM timing to incoming video sync signals. |
| Per-Zone LED Open/Short Detection | Identifies failed LEDs or wiring faults in individual dimming zones before they cause visible artifacts or thermal runaway. |
| Dual Diagnostic Reporting Modes | UART/INT mode enables detailed fault logging; SOUT/CLK_O mode preserves pin count and simplifies routing in space-constrained layouts. |
Applications
| TV Local Dimming | Monitor Backlight Control |
|---|---|
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 current sink driving LED strings behind quantum-dot film; synchronized via daisy chain to master timing controller. Use Value: Enables 50V string operation for fewer series LEDs per zone, reducing current density and improving thermal reliability while maintaining 15-bit grayscale fidelity. |
Use Scenario: Professional-grade monitors with factory-calibrated sRGB/DCI-P3 gamut and flicker-free low-blue-light modes. IC Role / Device Role / Timing Role: Local dimming driver interfacing with embedded DisplayPort AUX channel for real-time brightness updates. Use Value: AHVC minimizes power dissipation in slim-bezel enclosures; black insertion eliminates motion blur during fast-paced content without added panel latency. |
| Notebook Display Backlight | Tablet HDR Backlight |
Use Scenario: Thin-and-light Windows laptops with 14–16″ IPS panels and Dolby Vision support. IC Role / Device Role / Timing Role: Secondary backlight controller receiving I²C-bridged commands from EC; manages 16-zone dimming with VRR alignment to GPU frame pacing. Use Value: 30mA/50V rating allows use of higher-Vf blue-pump LEDs, increasing optical efficiency and extending battery life during HDR playback. |
Use Scenario: Premium Android/iPad tablets with 120Hz displays and streaming HDR video playback. IC Role / Device Role / Timing Role: Integrated LED driver in display module PCB; communicates via daisy chain to reduce trace count versus parallel interfaces. Use Value: Standby current ≤200µA extends sleep-mode battery life; programmable refresh rate adaptation prevents flicker during variable-frame-rate streaming apps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC69611RTWR | 60mA/20V output capability; identical pinout, interface, and feature set. | Targeted at lower-voltage, higher-current LED configurations (e.g., short strings with high IF). | Select when panel design uses <20V LED strings and requires >30mA per zone for peak brightness. |
| TLC69661RTWR | 60mA/50V output; shares all control features, diagnostics, and package with TLC69651RTWR. | Suitable for ultra-high-brightness panels where both high voltage and high current per zone are needed. | Choose when driving high-luminance mini-LED arrays demanding >30mA at 50V, such as premium gaming monitors. |
Compared with TLC69651RTWR, TLC69611RTWR trades 50V compliance for doubled current at 20V-ideal for compact LED layouts-while TLC69661RTWR extends both voltage and current capability, enabling future-proof designs for next-gen mini-LED backlights without changing PCB layout.
Availability
TLC69651RTWR is available at Aetrix Electronics and suitable for TV, monitor, and notebook backlight systems requiring stable component supply, long-term lifecycle support, and automotive-qualified variants (TLC69651-Q1) for infotainment displays.
Supply support for TLC69651RTWR 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 specializing in analog, embedded processing, and digital signal processing technologies, with leadership in power management and precision analog ICs.
The TLC696x1 family was designed specifically for high-channel-count LCD local dimming backlight systems, emphasizing system-level efficiency (via AHVC), display quality (via black insertion/VRR), and scalability (via robust daisy-chain architecture).
FAQ
What is the maximum LED string voltage supported by the TLC69651RTWR?
The TLC69651RTWR supports up to 50V compliance voltage per output channel, enabling direct drive of longer LED strings without external high-voltage boost stages. This specification is confirmed in the device's "Features" and "Description" sections and applies specifically to the TLC69651RTWR variant-not the TLC69601RTWR (20V/30mA) or TLC69611RTWR (20V/60mA). The 50V rating ensures compatibility with high-forward-voltage blue-pump and mini-LED configurations used in modern HDR displays.
Does the TLC69651RTWR support daisy-chaining, and how many devices can be cascaded?
Yes, the TLC69651RTWR supports daisy-chaining via dedicated CLK_I/SIN inputs and CLK_O/SOUT outputs, with documented support for up to 1024 devices in a single chain-enabling control of 16,000 local dimming zones. This topology reduces host interface burden and PCB routing complexity. Each device forwards clock and data to the next, with timing validated up to 20MHz, ensuring sub-microsecond update latency even in large-scale implementations.
How does Adaptive Headroom Voltage Control (AHVC) function in the TLC69651RTWR?
AHVC in the TLC69651RTWR dynamically adjusts the DC/DC converter's output voltage to match the highest forward voltage among active LED strings plus a small safety margin. Only the FB pin of the final device in the daisy chain connects to the DC/DC feedback node, simplifying layout and eliminating per-device sensing. This reduces power loss in the LED driver stage by minimizing excess headroom-verified to improve system efficiency by up to 30% versus fixed-output DC/DC solutions.
What diagnostic capabilities does the TLC69651RTWR provide, and how are they reported?
The TLC69651RTWR provides per-channel LED open/short detection (LOD/LSD) and device-level thermal shutdown detection (TSD). These faults are reported through two configurable options: UART + INT pin (for detailed register-based logging) or two-wire SOUT/CLK_O (for minimal-pin-count status flagging). The selection is register-programmable, allowing system architects to choose based on MCU interface availability and debug requirements-both modes are fully functional and validated in the production datasheet.
Is the TLC69651RTWR pin-compatible with other members of the TLC696x1 family?
Yes, the TLC69651RTWR is pin-compatible with TLC69601RTWR, TLC69611RTWR, and TLC69661RTWR in the same WQFN-24 (RTW) package-including identical pin functions, spacing, thermal pad layout, and footprint. This allows direct substitution in existing designs when upgrading current/voltage requirements, provided firmware and external DC/DC settings are updated to match the new device's electrical specifications.
TLC69651RTWR 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:
- 30mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
TLC69651RTWR FAQ
1.How can I place an order for TLC69651RTWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC69651RTWR 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 TLC69651RTWR reliable?
The price and inventory of TLC69651RTWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC69651RTWR is usually 5 days.
3.What payment methods are accepted for TLC69651RTWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC69651RTWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC69651RTWR?
TLC69651RTWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC69651RTWR 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 TLC69651RTWR?
For technical support, including TLC69651RTWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC69651RTWR requirements.
6.How does Aetrix verify that TLC69651RTWR is sourced from the original manufacturer or authorized distributors?
All TLC69651RTWR 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 TLC69651RTWR meets industry standards.
7.What is the process for return or replacement of TLC69651RTWR?
All TLC69651RTWR units undergo pre-shipment inspection (PSI). If there is an issue with TLC69651RTWR, 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 TLC69651RTWR part is unused and in its original packaging.
Return procedure for TLC69651RTWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC69651RTWR 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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