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Texas Instruments TLC5929DBQ
- Part No.:
- TLC5929DBQ
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
TLC5929DBQ.pdf
- Description:
- IC LED DRIVER LINEAR 50MA 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:617
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Product details
Overview
TLC5929DBQ 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 TLC5929DBQ datasheet, TLC5929DBQ pinout, TLC5929DBQ application, or TLC5929DBQ equivalent, key selection criteria include its daisy-chainable serial interface (33 MHz SCLK), invisible detection mode for LED fault diagnosis, power-save mode (10 µA), and SSOP-24 package thermal performance (θJA = 85.3°C/W).
Technical Context
The TLC5929DBQ implements a 17-bit serial shift register with dual-latch architecture: one 16-bit output on/off data latch and one 16-bit control data latch for global brightness, LSD voltage select, and error flag configuration. Its constant-current sink outputs are individually programmable via serial data and globally scaled by 7-bit BC register.
Error diagnostics include LED open detection (LOD) and LED short detection (LSD) with invisible detection mode (IDM), output leakage detection (OLD) threshold of 3 µA, pre-thermal warning (138°C), and thermal shutdown (150°C). All flags are readable via the same serial interface used for configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 constant-current sink outputs (OUT0–OUT15), each programmable on/off via serial data |
| Current capability | Up to 50 mA per channel at VCC > 3.6 V; 40 mA at VCC ≤ 3.6 V - set by single external IREF resistor |
| Brightness control | 7-bit global control (128 steps); scales all output currents linearly from 0% to 100% of IOLCMax |
| Data rate | 33 MHz SCLK - enables fast LED matrix refresh and real-time brightness updates |
| BLANK pulse width | Minimum 40 ns - allows precise PWM dimming synchronization across daisy-chained devices |
| Power-save current | 10 µA typical - achieved by writing all '0' to output latch and enabling PSMODE bit |
| Operating temperature | –40°C to +85°C ambient - validated for outdoor signage and industrial LED lighting |
Pinout & Package
Package: SSOP-24 (DBQ), 0.15 mm pitch, exposed thermal pad not present (unlike PWP variant); suitable for moderate-power LED driving with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BLANK (21) | Global output disable input | Active-high signal forcing all 16 outputs OFF regardless of latch state; enables synchronized blanking in multi-device chains |
| GND (1, 22) | Power and signal reference | Dual ground pins reduce impedance and improve noise immunity for analog current regulation |
| IREF (23) | Current reference programming terminal | Connects to external resistor (1.32 kΩ–66 kΩ) to set maximum sink current; open-circuit disables outputs |
| LAT (4) | Data latch strobe | Rising edge transfers 16-bit data from shift register to output or control latch based on MSB value |
| OUT0–OUT15 (5–20) | Constant-current sink outputs | Each drives one LED cathode; supports up to 10 V LED supply; parallelable for higher current |
| SCLK (3) | Serial clock input | 33 MHz max rate; rising edge shifts SIN data into 17-bit shift register and clocks SOUT |
| SIN (2) | Serial data input | LSB-first 17-bit data stream for output control, brightness, or diagnostic configuration |
| SOUT (22) | Serial data output | MSB of shift register; enables daisy-chaining without external logic or buffers |
| VCC (24) | Logic and analog supply | 3.0 V–5.5 V operation; powers internal reference, logic, and current sinks |
Key Features
| Feature | Design Value |
|---|---|
| 16-channel constant-current sink | ±1% typical channel-to-channel matching ensures uniform LED brightness without per-channel calibration |
| Invisible detection mode (IDM) | LOD/LSD diagnostics operate even when outputs are OFF - enables continuous health monitoring during standby |
| Full self-diagnosis | Six error flags (LOD, LSD, OLD, ISF, PTW, TEF) readable via serial interface - eliminates need for external sense circuitry |
| 2-ns inter-channel switching delay | Minimizes inrush current during simultaneous channel transitions - reduces EMI and supply rail droop |
| Power-save mode | 10 µA ICC5 current with all outputs disabled - extends battery life in portable LED applications |
Applications
| Variable Message Signs (VMS) | Illumination Systems |
|---|---|
Use Scenario: Outdoor highway signage requiring high-brightness, long-life LED arrays with real-time content updates and fault reporting. IC Role / Device Role / Timing Role: Constant-current sink driver managing 16 LED segments per device; daisy-chained for large displays; BLANK synchronized across units for flicker-free PWM. Use Value: ±1% current matching ensures consistent luminance across rows/columns; LOD/LSD detection prevents full-panel failure from single LED faults. | Use Scenario: Architectural LED lighting where thermal management and reliability are critical in enclosed fixtures. IC Role / Device Role / Timing Role: Primary LED current controller with pre-thermal warning (138°C) and thermal shutdown (150°C) to protect LEDs and driver IC under sustained load. Use Value: Power-save mode (10 µA) enables zero-power standby; invisible detection confirms LED integrity before illumination cycles begin. |
| Industrial Panel Displays | LED Backlighting for Control Interfaces |
Use Scenario: Factory HMI panels needing robust LED indicators resistant to voltage transients and thermal stress. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with undervoltage lockout and reference terminal short detection (ISF) to prevent misoperation during brownouts. Use Value: 3.0 V–5.5 V wide supply range accommodates 3.3 V or 5 V system rails; ±4% device-to-device current accuracy simplifies BOM consolidation. | Use Scenario: Touchscreen bezel backlighting requiring smooth dimming, low EMI, and minimal board space. IC Role / Device Role / Timing Role: Serial-controlled current sink enabling compact layout; 7-bit global brightness control provides 128-step dimming resolution without PWM jitter. Use Value: 2-ns inter-channel delay suppresses current surges during frame updates; SSOP-24 footprint fits tight spacing constraints. |
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 |
|---|---|---|---|
| TLC5940DBQR | 16-channel, but uses dot-correction (6-bit per channel) + global brightness (6-bit); no built-in LOD/LSD; requires external Vref | Lacks integrated fault detection and invisible mode; suited for high-precision grayscale control rather than reliability-critical signage | Select when per-channel grayscale tuning outweighs diagnostic needs |
| MAX6966ATL+ | 16-channel with 8-bit PWM per channel; includes thermal shutdown but no LED open/short detection; I²C interface instead of SPI-like serial | Requires I²C host; no daisy-chain SOUT; lower max current (20 mA) limits high-brightness use cases | Select for I²C-based systems prioritizing per-channel PWM over fault resilience |
Compared with TLC5940DBQR and MAX6966ATL+, the TLC5929DBQ uniquely combines daisy-chainable serial control, integrated LED diagnostics with invisible mode, and 50 mA per channel - making it optimal for outdoor signage and industrial LED systems demanding both performance and field reliability.
Availability
TLC5929DBQ is available at Aetrix Electronics and suitable for variable message signs, architectural illumination systems, and industrial panel displays requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLC5929DBQ 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.
The TLC5929 belongs to TI's high-reliability LED driver product line, designed specifically for outdoor signage, industrial lighting, and safety-critical LED applications requiring integrated diagnostics and stable current regulation.
FAQ
What is the maximum LED supply voltage supported by the TLC5929DBQ?
The TLC5929DBQ supports LED supply voltages up to 10 V applied to its OUT0–OUT15 pins. This allows direct driving of multi-LED strings (e.g., 3× white LEDs @ 3.2 V each) without external boost circuitry. The device regulates sink current independently of output voltage within this range, maintaining ±1% channel-to-channel accuracy up to 10 V VOUT.
How does the invisible detection mode (IDM) work in the TLC5929DBQ?
The invisible detection mode (IDM) in the TLC5929DBQ enables LED open detection (LOD) and LED short detection (LSD) even when all outputs are turned OFF via the BLANK pin or output latch data. IDM operates using internal test pulses and reference thresholds (e.g., VLSD0 = 0.32 × VCC), allowing continuous health monitoring without disrupting normal display operation - a key feature for mission-critical signage systems relying on the TLC5929DBQ.
Can the TLC5929DBQ be daisy-chained, and how is data routed between devices?
Yes, the TLC5929DBQ supports daisy-chaining via its SIN and SOUT pins. Data shifted into the 17-bit common shift register enters through SIN on each SCLK rising edge and exits from SOUT at the same edge. When cascading multiple TLC5929DBQ devices, SOUT of one connects to SIN of the next, enabling single-wire serial control of dozens of channels with no additional logic. LAT and BLANK remain shared across the chain for synchronized latching and blanking.
What external component sets the output current for the TLC5929DBQ, and what is its valid resistance range?
The output current of the TLC5929DBQ is set by a single external resistor (RIREF) connected between the IREF pin and GND. Valid resistance values range from 1.32 kΩ to 66.0 kΩ, corresponding to maximum sink currents of 50 mA (at VCC > 3.6 V) down to 1 mA. For example, RIREF = 1.32 kΩ yields ~50 mA per channel with BC = 7Fh, while 66.0 kΩ yields ~1 mA - all values are validated in the TLC5929DBQ datasheet's Table 1.
Does the TLC5929DBQ include thermal protection, and what are the trip thresholds?
Yes, the TLC5929DBQ includes two thermal protection features: pre-thermal warning (PTW) triggers at 138°C (typical junction temperature), and thermal shutdown (TSD) activates at 150°C (typical). Both generate flag bits readable via the serial interface. Hysteresis of 5–20°C prevents oscillation near thresholds. These protections safeguard the TLC5929DBQ and connected LEDs during sustained overloads or poor heatsinking - critical in enclosed LED fixtures.
TLC5929DBQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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-SSOP
TLC5929DBQ FAQ
1.How can I place an order for TLC5929DBQ through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5929DBQ 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 TLC5929DBQ reliable?
The price and inventory of TLC5929DBQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5929DBQ is usually 5 days.
3.What payment methods are accepted for TLC5929DBQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5929DBQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5929DBQ?
TLC5929DBQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5929DBQ 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 TLC5929DBQ?
For technical support, including TLC5929DBQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5929DBQ requirements.
6.How does Aetrix verify that TLC5929DBQ is sourced from the original manufacturer or authorized distributors?
All TLC5929DBQ 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 TLC5929DBQ meets industry standards.
7.What is the process for return or replacement of TLC5929DBQ?
All TLC5929DBQ units undergo pre-shipment inspection (PSI). If there is an issue with TLC5929DBQ, 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 TLC5929DBQ part is unused and in its original packaging.
Return procedure for TLC5929DBQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5929DBQ Tags
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BCR420UE6433HTMA1
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