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Texas Instruments TLC5954RTQR
- Part No.:
- TLC5954RTQR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
TLC5954RTQR.pdf
- Description:
- IC LED DRV LIN 24.4/34.9MA 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,886
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Product details
Overview
TLC5954RTQR from Texas Instruments is a 48-channel constant-current LED sink driver with RGB channel grouping, 7-bit global brightness control per color (R/G/B), 3-bit maximum current control (8 steps), LED open/short detection, and power-save mode. It delivers up to 34.9 mA per red/green channel and 24.4 mA per blue channel at VCC = 3.0–3.6 V, supporting high-resolution LED video displays requiring precise white balance and fault monitoring.
For engineers reviewing the TLC5954RTQR datasheet, TLC5954RTQR pinout, TLC5954RTQR application, or TLC5954RTQR equivalent, key selection criteria include its 40 ns minimum BLANK pulse width for fine grayscale control, ±1% typical channel-to-channel current matching, VQFN-56 PowerPAD package thermal performance, and integrated LOD/LSD diagnostics for display reliability validation.
Technical Context
The TLC5954RTQR implements a 49-bit serial shift register with Schmitt-trigger inputs (SIN, SCLK, LAT, BLANK) and daisy-chainable SOUT output. Its internal architecture separates 48-bit on/off data latching from 40-bit control register (MC/BC/FC) updates, enabling independent brightness and fault-status configuration without disrupting active LED drive.
Each of the three 16-channel groups (OUTR0–15, OUTG0–15, OUTB0–15) features dedicated 7-bit global brightness control and shared 3-bit maximum current scaling. LED open detection thresholds are programmable across five voltage levels (0.15–0.65 V), while short-detection thresholds scale with VCC (0.45× to 0.95× VCC), supporting diverse LED forward-voltage configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 48 constant-current sink outputs grouped as 16 red, 16 green, 16 blue channels |
| Max output current | 34.9 mA per red/green channel, 24.4 mA per blue channel (MC=7h, VOUT=1 V) |
| Current accuracy | ±1% typical channel-to-channel matching within same color group |
| Brightness control | 7-bit global control (128 steps) per R/G/B group for white-point tuning |
| BLANK pulse min | 40 ns low-pulse width enables sub-microsecond grayscale timing resolution |
| Power-save current | 7 µA typical supply current when all outputs disabled and PSMODE active |
| Data rate | 30 MHz SCLK supports >1 kHz frame rates for 48-channel PWM update |
Pinout & Package
VQFN-56 (RTQ) package with 8 mm × 8 mm body and exposed thermal pad (GND-connected). Pin count: 56 terminals including 48 outputs, 4 control inputs, 1 serial output, 2 power, and 1 ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SIN | Serial data input | Schmitt-triggered LSB-first data entry into 49-bit shift register; supports daisy-chaining |
| SCLK | Shift clock input | Rising-edge synchronized data shifting; 30 MHz max rate ensures fast register loading |
| LAT | Data latch control | Rising edge transfers shift register contents to output on/off or control registers |
| BLANK | Global output enable | Active-high signal forces all 48 outputs off; 40 ns min pulse enables precise PWM dimming |
| SOUT | Serial data output | MSB of shift register; enables cascading multiple TLC5954RTQR devices in series |
| OUTR0–15 | Red LED sink outputs | 16 constant-current sinks with independent on/off control; support parallel connection |
| OUTG0–15 | Green LED sink outputs | 16 constant-current sinks with identical specs to red group; enable RGB color balancing |
| OUTB0–15 | Blue LED sink outputs | 16 constant-current sinks rated for lower max current (24.4 mA) vs. red/green (34.9 mA) |
| VCC | Supply voltage | 3.0–3.6 V digital/analog rail; powers logic and current-sink circuitry |
| GND | Ground reference | Multiple pins (1, 56, plus thermal pad) ensure low-impedance return path for 48 channels |
Key Features
| Feature | Design Value |
|---|---|
| No external current-setting resistor | 3-bit maximum current control (MC) eliminates resistor tolerance drift and board space |
| LED open/short detection | Programmable LOD thresholds (0.15–0.65 V) and LSD thresholds (45–95% of VCC) enable real-time lamp health monitoring |
| Low-knee voltage operation | 0.32 V typical output saturation voltage reduces power loss and heat generation in high-current LED strings |
| Thermal management | Exposed thermal pad (GND) and 7.7°C/W junction-to-board resistance support continuous 34.9 mA operation |
| Undervoltage lockout | UVLO circuit holds outputs in safe-off state during VCC ramp-up, preventing erratic LED behavior |
Applications
| LED Video Displays | Variable Message Signs (VMS) |
|---|---|
Use Scenario: High-density indoor/outdoor full-color LED panels requiring uniform brightness and accurate white-point reproduction. IC Role / Device Role / Timing Role: Constant-current sink driver providing per-pixel RGB intensity control via BLANK-based PWM and 7-bit BC register updates. Use Value: ±1% channel-to-channel current matching ensures consistent luminance across 48 LEDs per IC, reducing color banding in large-area displays. | Use Scenario: Highway-facing electronic message boards needing long-term reliability and failure detection under varying ambient temperatures. IC Role / Device Role / Timing Role: Fault-aware LED driver performing periodic LOD/LSD checks during display idle cycles to identify failed lamps before visibility impact. Use Value: Programmable open-detection thresholds (0.15–0.65 V) accommodate aging LED VF shifts, extending maintenance intervals by 30%+ in field deployments. |
| Illumination Systems | Architectural Lighting |
Use Scenario: Tunable-white and color-changing LED fixtures where smooth dimming and stable CCT maintenance are critical. IC Role / Device Role / Timing Role: Independent 7-bit brightness control per R/G/B group enables precise correlated color temperature (CCT) adjustment without recalculating PWM duty cycles. Use Value: 128-step BC resolution per channel allows <100K CCT step resolution across 2700K–6500K range, meeting DLC Premium requirements. | Use Scenario: Large-scale building façade lighting with distributed drivers requiring low standby power and thermal resilience. IC Role / Device Role / Timing Role: Power-save mode (7 µA ICC4) activated during nighttime hours to reduce system-wide quiescent consumption by >95%. Use Value: Thermal pad + VQFN-56 package achieves 7.7°C/W θJB, enabling 48-channel operation at 85°C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RTQR | 48-channel, 16-bit PWM + 6-bit DC current control; no LOD/LSD; higher resolution but no fault detection | Best for high-fidelity animation where grayscale depth outweighs fault monitoring needs | Select when 65,536-step PWM precision is required over diagnostic capability |
| IS31FL3731-QFLS4-TR | 28-channel, I²C interface, integrated auto-breathing; lower channel count, no BLANK-based PWM | Suitable for compact UI lighting with simpler control but insufficient for large video walls | Choose for space-constrained designs needing I²C simplicity and built-in effects |
Compared with TLC5954RTQR, TLC5947RTQR offers superior grayscale resolution but lacks LED fault diagnostics, while IS31FL3731-QFLS4-TR provides easier I²C integration at the cost of channel count and BLANK-driven timing control-making TLC5954RTQR optimal for reliability-critical, high-channel-count video applications.
Availability
TLC5954RTQR is available at Aetrix Electronics and suitable for LED video displays, variable message signs, and architectural lighting requiring stable component supply, long-lifecycle assurance, and traceable sourcing for industrial-grade production.
Supply support for TLC5954RTQR 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 specializing in analog and embedded processing technologies, with decades of expertise in precision power management and signal chain solutions.
The TLC5954RTQR belongs to TI's high-channel-count LED driver product line, engineered specifically for outdoor/industrial LED displays demanding robust fault detection, thermal resilience, and fine-grained RGB current control without external components.
FAQ
What is the minimum BLANK pulse width supported by the TLC5954RTQR?
The TLC5954RTQR supports a minimum BLANK pulse duration of 40 ns, enabling ultra-fine grayscale control in high-refresh-rate LED video applications. This specification is guaranteed across the full operating temperature range (–40°C to +85°C) and ensures reliable blanking even at 30 MHz SCLK operation. The 40 ns timing allows sub-microsecond LED on-time resolution, critical for achieving >16-bit effective grayscale depth through time-multiplexing. This parameter is measured under standard test conditions with CL = 15 pF and RL = 100 Ω for red/green outputs.
How does the TLC5954RTQR implement LED open and short detection?
The TLC5954RTQR integrates dedicated LED open detection (LOD) and LED short detection (LSD) circuits per output channel. LOD thresholds are programmable across five levels (0.15–0.65 V) via the LODVLT register bits, while LSD thresholds scale with VCC (45–95%) using LSDVLT bits. Detection results are reported through status bits readable via the serial interface. These functions operate independently of normal drive mode and can be triggered during display idle periods, allowing proactive failure identification without interrupting visual output. The TLC5954RTQR uses internal comparators referenced to each channel's output node.
What package type and thermal characteristics does the TLC5954RTQR use?
The TLC5954RTQR is housed in a VQFN-56 (RTQ) package measuring 8 mm × 8 mm with an exposed thermal pad connected to GND. Its thermal metrics include 7.7°C/W junction-to-board (θJB) and 29.1°C/W junction-to-ambient (θJA) resistance. The thermal pad must be soldered to a PCB copper pour for effective heat dissipation. This construction enables continuous operation at maximum rated current (34.9 mA per red/green channel) at +85°C ambient, making it suitable for enclosed or high-power-density LED display modules where airflow is limited.
Can the TLC5954RTQR drive different LED types simultaneously on the same device?
Yes, the TLC5954RTQR supports mixed LED configurations through independent current programming per color group. Red and green channels (OUTR0–15, OUTG0–15) are rated for up to 34.9 mA, while blue channels (OUTB0–15) support up to 24.4 mA-matching typical forward-voltage disparities between InGaN (blue) and AlInGaP (red/green) LEDs. Each group has separate 7-bit global brightness control, allowing dynamic white-point adjustment. Output voltages up to 10 V permit driving series-connected LED strings, and the 0.32 V typical saturation voltage minimizes power loss across diverse VF ranges.
What is the role of the SOUT pin in multi-device configurations?
The SOUT pin of the TLC5954RTQR outputs the MSB of the internal 49-bit shift register, enabling seamless daisy-chaining of multiple devices. When SIN of the next TLC5954RTQR is connected to SOUT of the prior device, a single 49-bit serial stream can configure several ICs-reducing controller GPIO count and simplifying PCB routing. Data propagates synchronously with SCLK, and LAT latches the complete chain simultaneously. This architecture supports scalable LED systems (e.g., 192-channel display using four TLC5954RTQRs) with deterministic timing and minimal inter-device skew.
TLC5954RTQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 56-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 48
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 3.6V
- Voltage - Output:
- 10V
- Current - Output / Channel:
- 24.4mA, 34.9mA
- Frequency:
- -
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-QFN (8x8)
TLC5954RTQR FAQ
1.How can I place an order for TLC5954RTQR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5954RTQR 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 TLC5954RTQR reliable?
The price and inventory of TLC5954RTQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5954RTQR is usually 5 days.
3.What payment methods are accepted for TLC5954RTQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5954RTQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5954RTQR?
TLC5954RTQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5954RTQR 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 TLC5954RTQR?
For technical support, including TLC5954RTQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5954RTQR requirements.
6.How does Aetrix verify that TLC5954RTQR is sourced from the original manufacturer or authorized distributors?
All TLC5954RTQR 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 TLC5954RTQR meets industry standards.
7.What is the process for return or replacement of TLC5954RTQR?
All TLC5954RTQR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5954RTQR, 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 TLC5954RTQR part is unused and in its original packaging.
Return procedure for TLC5954RTQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5954RTQR 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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