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Texas Instruments TLC5929RGET
- Part No.:
- TLC5929RGET
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
TLC5929RGET.pdf
- Description:
- IC LED DRIVER LINEAR 50MA 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:440
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Product details
Overview
TLC5929RGET from Texas Instruments is a 16-channel constant-current LED sink driver with 7-bit global brightness control (128 steps), ±1% typical channel-to-channel current accuracy, and integrated LED open/short detection. It operates from 3.0 V to 5.5 V supply voltage, supports up to 10 V LED supply, and delivers up to 50 mA per channel at VCC > 3.6 V - used in variable message signs and high-reliability LED illumination systems.
For engineers reviewing the TLC5929RGET datasheet, TLC5929RGET pinout, TLC5929RGET application, or TLC5929RGET equivalent, key selection criteria include its daisy-chainable serial interface (33 MHz SCLK), invisible detection mode for fault diagnosis during output-off states, power-save mode (10 µA typ), and QFN-24 PowerPAD™ thermal performance (θJCbot = 6.2 °C/W).
Technical Context
The TLC5929RGET implements a 17-bit serial shift register with dual-latch architecture: one 16-bit latch for output on/off control and another for function configuration (global brightness, LSD voltage select, IDM timing). Data is clocked in via SIN/SCLK and latched on LAT rising edge, with MSB-driven SID readback via SOUT.
Its analog core uses a single external resistor (RIREF, 1.32–66.0 kΩ) to set maximum sink current per channel (1–50 mA), modulated linearly by 7-bit BC data. Fault detection includes LOD, LSD (with 4 selectable thresholds), OLD (3 µA leak detection), ISF, PTW (138°C), and TSD (150°C), all readable over the same serial interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 constant-current sink outputs, each independently controllable via serial data |
| Max sink current | 50 mA per channel at VCC > 3.6 V - enables high-brightness LED strings without external current-setting components |
| Current accuracy | ±1% (typ) channel-to-channel mismatch - ensures uniform LED brightness across all 16 outputs |
| Data rate | 33 MHz SCLK - supports fast LED refresh rates and real-time brightness updates in dynamic signage |
| Brightness control | 7-bit (128-step) global dimming - provides smooth, flicker-free intensity scaling without PWM artifacts |
| Fault detection | LED open/short, output leakage (3 µA), pre-thermal warning (138°C), thermal shutdown (150°C) - enables autonomous system health monitoring |
| Power-save mode | 10 µA typical ICC5 - reduces standby power in always-on LED displays while preserving latch state |
Pinout & Package
Package: QFN-24 (RGE) with exposed thermal pad (PowerPAD™) for enhanced heat dissipation; footprint compatible with JEDEC MO-220 variation VGGD2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BLANK (18) | Global output disable input | Active-high signal forces all 16 outputs OFF instantly - used for strobing, blanking, or emergency shutdown |
| GND (22) | Ground reference | Primary return path for all sink currents and logic; connects to thermal pad for low-impedance heat transfer |
| IREF (20) | Current reference input/output | Connects external resistor to GND to set max output current; open-circuit disables all outputs |
| LAT (1) | Data latch control | Rising edge transfers 16-bit data from shift register to output or control latch - synchronizes LED state updates |
| OUT0–OUT15 (2–17) | Constant-current sink outputs | Each drives one LED cathode; supports parallel connection for higher current per segment |
| SCLK (24) | Serial clock input | 33 MHz max rate - defines timing resolution for data loading and diagnostic readback |
| SIN (23) | Serial data input | LSB-first 17-bit frame entry point for on/off data, brightness control, and configuration commands |
| SOUT (19) | Serial data output | MSB of shift register - enables daisy-chaining multiple TLC5929RGET devices with single controller |
| VCC (21) | Logic and analog supply | 3.0–5.5 V operation - powers internal logic, reference circuitry, and gate drivers for output FETs |
Key Features
| Feature | Design Value |
|---|---|
| Invisible detection mode (IDM) | Performs LED open/short diagnostics even when outputs are OFF - eliminates visible flicker during fault checking |
| Daisy-chain serial interface | Single SIN/SCLK/LAT/BLANK bus controls unlimited cascaded TLC5929RGET units - reduces MCU GPIO count and PCB routing complexity |
| Thermal protection with hysteresis | Pre-thermal warning at 138°C and shutdown at 150°C (5–20°C hysteresis) - prevents thermal runaway in enclosed LED housings |
| Output leakage detection | Identifies <3 µA leakage current per channel - detects early-stage insulation degradation in high-voltage LED arrays |
| 7-bit global brightness control | Linear 0–100% current scaling with 0.8% step resolution - replaces external PWM dimming circuitry and reduces EMI |
Applications
| Variable Message Signs (VMS) | Architectural LED Illumination |
|---|---|
Use Scenario: Outdoor electronic highway signs requiring high reliability, wide temperature operation (–40°C to +85°C), and real-time content updates. IC Role / Device Role / Timing Role: Constant-current sink driver managing 16 LED segments per unit, daisy-chained for full sign matrix control. Use Value: ±1% channel matching ensures uniform luminance across large display areas; LOD/LSD detection enables remote fault localization without physical inspection. |
Use Scenario: Multi-color façade lighting systems with long cable runs and mixed LED forward voltages (up to 10 V). IC Role / Device Role / Timing Role: High-side LED supply interface with precise current regulation per zone, coordinated via serial bus. Use Value: Single RIREF resistor simplifies BOM and calibration; 50 mA per channel supports high-efficiency white LEDs without external transistors. |
| Industrial Control Panels | Transportation Lighting |
Use Scenario: Operator interface panels in factory automation where status indicators must remain visible under ambient light and survive vibration/shock. IC Role / Device Role / Timing Role: LED driver with integrated diagnostics for predictive maintenance alerts and self-test capability. Use Value: Invisible detection mode allows continuous health monitoring without interrupting panel operation or causing visual distraction. |
Use Scenario: Interior cabin lighting in rail and bus systems requiring EMC robustness, thermal resilience, and fail-safe behavior. IC Role / Device Role / Timing Role: Current-regulated LED driver with thermal shutdown and undervoltage lockout for battery-supplied environments. Use Value: Power-save mode (10 µA) extends backup battery life; BLANK pin enables synchronized dimming during motion-sensing events. |
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 |
|---|---|---|---|
| TLC5940RHBR | 16-channel, but uses dot-correction (6-bit) + grayscale (12-bit) PWM instead of analog current control; no built-in LOD/LSD | Superior grayscale depth for video-grade LED displays; lacks fault diagnostics required for safety-critical signage | Select TLC5940RHBR only when high-resolution PWM dimming outweighs need for real-time LED health monitoring |
| IS31FL3728-QFLS4-TR | 28-channel, I²C interface, integrated auto-breathing; ±3% current accuracy vs. ±1% for TLC5929RGET | Better suited for compact consumer UIs; lower channel accuracy and no invisible detection limit use in outdoor VMS | Choose IS31FL3728-QFLS4-TR for space-constrained designs needing I²C simplicity, not industrial-grade diagnostics |
Compared with TLC5940RHBR and IS31FL3728-QFLS4-TR, the TLC5929RGET uniquely combines tight current matching, comprehensive fault detection with invisible mode, and daisy-chain SPI compatibility - making it the only option qualified for mission-critical LED signage where uptime and remote diagnostics are mandatory.
Availability
TLC5929RGET is available at Aetrix Electronics and suitable for variable message signs, architectural LED illumination, and industrial control panels requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLC5929RGET 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 connectivity technologies, with decades of automotive and industrial qualification expertise.
The TLC5929 product line was engineered for high-reliability LED lighting systems demanding precision current regulation, autonomous fault detection, and robust serial control - targeting transportation, infrastructure, and industrial human-machine interfaces.
FAQ
What is the maximum LED supply voltage supported by the TLC5929RGET?
The TLC5929RGET supports up to 10 V at its OUT0–OUT15 pins, enabling direct drive of multi-LED series strings without external boost circuitry. This rating is independent of the 3.0–5.5 V VCC supply, allowing separation of logic and LED power domains for improved noise immunity and thermal management in the TLC5929RGET design.
How does the invisible detection mode (IDM) work in the TLC5929RGET?
IDM in the TLC5929RGET performs LED open/short detection while outputs remain OFF by injecting brief test pulses through dedicated internal paths - avoiding visible flicker or disruption of displayed content. The TLC5929RGET reports results via SID readback on SOUT, enabling background health checks without affecting user-facing LED states.
Can the TLC5929RGET be used in daisy-chain configuration, and what is the maximum number of devices?
Yes, the TLC5929RGET supports unlimited daisy-chaining via SIN→SOUT interconnection. Each device shifts its 17-bit frame and passes residual bits downstream; latency scales linearly with chain length. The TLC5929RGET's 33 MHz SCLK tolerance ensures reliable timing even across 50+ units in large-scale VMS installations.
What is the role of the RIREF resistor in the TLC5929RGET, and what value sets 40 mA per channel?
The RIREF resistor between IREF and GND sets the maximum sink current per channel. For 40 mA at VCC = 3.3 V, TI specifies RIREF = 1.65 kΩ (typical). The TLC5929RGET's internal 1.205 V reference yields IOLCMax ≈ 54.8 V / RIREF, so 1.65 kΩ gives ~33.2 mA - confirming datasheet Table 1 where 1.65 kΩ maps to 40 mA at VCC > 3.6 V. The TLC5929RGET requires precise resistor placement near the IREF pin for stability.
Does the TLC5929RGET require external pull-up or pull-down resistors on its control pins?
No external biasing is required: SIN, SCLK, LAT, and BLANK have CMOS-compatible inputs with VIH = 0.7×VCC and VIL = 0.3×VCC, and internal weak pull-downs ensure defined states at power-up. The TLC5929RGET datasheet specifies IIN ≤ ±1 µA at these pins, confirming robust noise immunity without added components - simplifying layout and reducing BOM cost for the TLC5929RGET.
TLC5929RGET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 10V
- Current - Output / Channel:
- 50mA
- Frequency:
- 20MHz
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (4x4)
TLC5929RGET FAQ
1.How can I place an order for TLC5929RGET through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5929RGET 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 TLC5929RGET reliable?
The price and inventory of TLC5929RGET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5929RGET is usually 5 days.
3.What payment methods are accepted for TLC5929RGET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5929RGET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5929RGET?
TLC5929RGET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5929RGET 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 TLC5929RGET?
For technical support, including TLC5929RGET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5929RGET requirements.
6.How does Aetrix verify that TLC5929RGET is sourced from the original manufacturer or authorized distributors?
All TLC5929RGET 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 TLC5929RGET meets industry standards.
7.What is the process for return or replacement of TLC5929RGET?
All TLC5929RGET units undergo pre-shipment inspection (PSI). If there is an issue with TLC5929RGET, 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 TLC5929RGET part is unused and in its original packaging.
Return procedure for TLC5929RGET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5929RGET Tags
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