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Texas Instruments TLC5954RTQT
- Part No.:
- TLC5954RTQT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
TLC5954RTQT.pdf
- Description:
- IC LED DRV LIN 24.4/34.9MA 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,951
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Product details
Overview
TLC5954RTQT from Texas Instruments is a 48-channel constant-current LED sink driver with independent R/G/B group control, 7-bit global brightness (128-step) per color, 3-bit maximum current control (8-step), LED open/short detection, and power-save mode consuming 7 µA typical. It operates from 3.0 V to 3.6 V and supports up to 10 V LED supply, enabling high-fidelity RGB video displays requiring precise white balance and fault monitoring.
For engineers reviewing the TLC5954RTQT datasheet, TLC5954RTQT pinout, TLC5954RTQT application, or TLC5954RTQT equivalent, key selection criteria include its 48-channel sink architecture, BLANK pulse timing down to 40 ns, ±1% channel-to-channel current matching, VQFN-56 thermal-pad package, and integrated LOD/LSD diagnostics for outdoor signage and industrial LED panels.
Technical Context
The TLC5954RTQT implements a 49-bit serial shift register with Schmitt-trigger inputs (SIN, SCLK, LAT, BLANK), latching output-on/off states and configuration data (MC, BC, FC) on LAT rising edges. Its analog core features three independent 16-channel constant-current sinks-OUTR0–15, OUTG0–15, OUTB0–15-with programmable knee voltage (~0.32 V) and load regulation of ±1%/V.
It integrates dual diagnostic flags (LOD/LSD) readable via SOUT, UVLO reset, and power-save mode activated by all-off data + PSMODE bit. The device uses internal reference current generation-eliminating external Rset-and supports daisy-chained operation via SOUT-to-SIN cascading for multi-driver systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 48 constant-current sink outputs: 16 red (OUTR), 16 green (OUTG), 16 blue (OUTB) |
| Max sink current | 34.9 mA per channel (R/G), 24.4 mA per channel (B) at MC = 7h - sets full-scale drive capability without external resistor |
| Brightness control | 7-bit global BC (128 steps) per R/G/B group - enables fine-grained white-point tuning across color subpixels |
| Current accuracy | ±1% (typ), ±3% (max) channel-to-channel - ensures uniform luminance across LED arrays |
| BLANK pulse min | 40 ns low-time - supports high-refresh-rate grayscale PWM without visible flicker |
| Power-save current | 7 µA typical - reduces system standby power in signage or architectural lighting during off-hours |
| Data rate | 30 MHz SCLK - enables fast frame updates for dynamic video content on large displays |
Pinout & Package
VQFN-56 (RTQ) package with 8 mm × 8 mm body and exposed thermal pad (soldered to GND). Thermal pad is electrically connected to internal ground and must be PCB-mounted for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SIN | Serial input | Schmitt-triggered data input to 49-bit shift register; LSB set on SCLK↑ when SIN high |
| SCLK | Shift clock | Rising-edge clock for serial data shifting; MSB appears on SOUT after 49 cycles |
| LAT | Data latch | Rising edge transfers shift register contents to output on/off or MC/BC/FC latches |
| BLANK | Global output enable | High forces all 48 outputs OFF; low enables control by latch data - used for PWM dimming |
| SOUT | Serial output | MSB of shift register; enables daisy-chaining multiple TLC5954RTQT devices |
| OUTR0–15 | Red sink outputs | 16 constant-current sinks for red LEDs; each independently controllable via latch data |
| OUTG0–15 | Green sink outputs | 16 constant-current sinks for green LEDs; grouped separately for independent BC scaling |
| OUTB0–15 | Blue sink outputs | 16 constant-current sinks for blue LEDs; lower max current reflects typical blue LED Vf |
| VCC | Digital supply | 3.0–3.6 V logic supply; powers shift register, latches, and digital logic |
| GND (×4) | Ground | All four GND pins and thermal pad connect internally to substrate ground - critical for noise immunity and thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| No external current-setting resistor | Internal reference eliminates Rset component, reducing BOM count and eliminating resistor drift/tolerance errors |
| LED open/short detection (LOD/LSD) | Two dedicated error flags readable via SOUT - enables real-time lamp health monitoring without external circuitry |
| Low-knee voltage (~0.32 V) | Minimizes power loss in driver stage, allowing higher efficiency and cooler operation in dense LED arrays |
| Daisy-chain capable | SOUT-to-SIN cascading supports scalable multi-chip LED systems with single controller interface |
| Power-save mode (7 µA) | Entire IC enters ultra-low-power state when all outputs are off - ideal for energy-sensitive outdoor installations |
Applications
| LED Video Displays | Variable Message Signs (VMS) |
|---|---|
Use Scenario: High-resolution indoor/outdoor LED video walls requiring true-color reproduction and long-term luminance stability. IC Role / Device Role / Timing Role: 48-channel constant-current sink driving RGB subpixels; BLANK signal provides precise PWM timing for grayscale control. Use Value: ±1% channel-to-channel current matching ensures uniform pixel brightness; 7-bit BC per color enables factory-calibrated white point retention over temperature. |
Use Scenario: Highway-facing variable message signs needing high reliability, fault reporting, and wide operating temperature range (–40°C to +85°C). IC Role / Device Role / Timing Role: LED driver with integrated LOD/LSD diagnostics; BLANK-controlled PWM supports daylight-readable brightness modulation. Use Value: Real-time open/short detection alerts maintenance systems before full panel failure; power-save mode reduces overnight energy consumption. |
| Illumination Systems | Architectural LED Lighting |
Use Scenario: Commercial retail lighting with tunable white and color-changing capability across large linear or planar arrays. IC Role / Device Role / Timing Role: Constant-current sink for multi-color LED strings; independent R/G/B BC registers enable CCT adjustment without reprogramming. Use Value: 128-step per-color brightness control allows smooth dimming and correlated color temperature (CCT) tuning from 2700K to 6500K. |
Use Scenario: Facade and accent lighting where thermal management, long service life, and remote fault diagnostics are critical. IC Role / Device Role / Timing Role: High-channel-count LED driver with thermal-pad package; LOD/LSD reports individual LED failures over DALI or proprietary bus. Use Value: Exposed thermal pad lowers junction-to-board resistance (RθJB = 7.7°C/W), extending lifetime in sealed enclosures; 40 ns BLANK supports high-frequency PWM for flicker-free operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RTQT | 48-channel, 16-bit PWM + 6-bit BC; no LOD/LSD; higher resolution but no diagnostics | Best for high-fidelity video where grayscale depth >128 levels is required, but fault detection is handled externally | Select TLC5954RTQT when LED health monitoring is mandatory; choose TLC5947RTQT when PWM resolution outweighs diagnostic needs |
| IS31FL3733-QFLS4 | 48-channel, I²C interface, integrated auto-breathing; no SOUT daisy-chain; different pinout | Suitable for space-constrained designs with microcontroller I²C buses; lacks BLANK-based PWM flexibility | Prefer TLC5954RTQT for SPI-like serial control with precise BLANK timing; use IS31FL3733-QFLS4 for simplified I²C integration and built-in effects |
Compared with TLC5947RTQT and IS31FL3733-QFLS4, the TLC5954RTQT uniquely combines daisy-chain serial interface, hardware LOD/LSD flags, and 40 ns BLANK timing-making it optimal for large-scale, safety-critical LED signage where diagnostics and timing precision cannot be compromised.
Availability
TLC5954RTQT is available at Aetrix Electronics and suitable for LED video displays, variable message signs (VMS), and architectural illumination requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for TLC5954RTQT 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, embedded processing, and high-reliability components for industrial, automotive, and communications markets.
The TLC5954RTQT belongs to TI's high-channel-count LED driver product line, designed specifically for RGB LED video walls and outdoor signage demanding integrated diagnostics, thermal robustness, and precise grayscale control without external passive components.
FAQ
What is the maximum LED supply voltage supported by the TLC5954RTQT?
The TLC5954RTQT supports LED power-supply voltages up to 10 V at its OUTXn terminals. This allows direct connection to common 5 V or 12 V LED string rails without intermediate regulation, provided the voltage drop across the LED string plus forward voltage remains within the 10 V absolute maximum rating. Operation above 10 V risks permanent damage.
How does the TLC5954RTQT implement LED open and short detection?
The TLC5954RTQT integrates dedicated LOD (LED Open Detection) and LSD (LED Short Detection) circuits per channel. LOD triggers when output voltage exceeds a programmable threshold (0.15–0.65 V); LSD triggers when voltage falls below another programmable threshold (0.45–0.95 × VCC). Detected faults are reported via two status bits readable through the serial interface on SOUT after a LAT pulse.
Can the TLC5954RTQT be used in daisy-chain configurations?
Yes, the TLC5954RTQT supports daisy-chaining via its SOUT pin, which outputs the MSB of the internal 49-bit shift register. Connecting SOUT of one device to SIN of the next enables synchronized programming of multiple TLC5954RTQT drivers using a single controller, reducing GPIO count and simplifying layout for large LED panels.
What is the purpose of the thermal pad on the TLC5954RTQT VQFN package?
The exposed thermal pad on the TLC5954RTQT RTQ package is electrically connected to internal GND and serves dual purposes: it provides a low-resistance thermal path (RθJB = 7.7°C/W) to the PCB for heat dissipation, and it enhances electrical grounding for noise immunity. TI requires this pad to be soldered to a solid GND plane on the PCB for both thermal and functional reliability.
Does the TLC5954RTQT require an external current-setting resistor?
No, the TLC5954RTQT eliminates the need for an external current-setting resistor. Its maximum output current is configured digitally via the 3-bit Maximum Current Control (MC) register, which selects from eight pre-calibrated internal reference levels (e.g., 34.9 mA for R/G, 24.4 mA for B at MC = 7h). This improves accuracy, reduces BOM cost, and avoids resistor-related drift or tolerance issues.
TLC5954RTQT 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)
TLC5954RTQT FAQ
1.How can I place an order for TLC5954RTQT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5954RTQT 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 TLC5954RTQT reliable?
The price and inventory of TLC5954RTQT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5954RTQT is usually 5 days.
3.What payment methods are accepted for TLC5954RTQT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5954RTQT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5954RTQT?
TLC5954RTQT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5954RTQT 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 TLC5954RTQT?
For technical support, including TLC5954RTQT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5954RTQT requirements.
6.How does Aetrix verify that TLC5954RTQT is sourced from the original manufacturer or authorized distributors?
All TLC5954RTQT 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 TLC5954RTQT meets industry standards.
7.What is the process for return or replacement of TLC5954RTQT?
All TLC5954RTQT units undergo pre-shipment inspection (PSI). If there is an issue with TLC5954RTQT, 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 TLC5954RTQT part is unused and in its original packaging.
Return procedure for TLC5954RTQT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5954RTQT 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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