My Inquiry
My Account
Texas Instruments TLC59581RTQT
- Part No.:
- TLC59581RTQT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
TLC59581RTQT.pdf
- Description:
- IC LED DRIVER LINEAR 25MA 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:335
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLC59581RTQT from Texas Instruments is a 48-channel, 16-bit enhanced PWM (ES-PWM) LED driver with pre-charge FET and LED open detection (LOD). It delivers individually adjustable constant-current sink outputs (25 mA max at 5 VCC, ±3% channel-to-channel accuracy), supports 32-multiplexing, and integrates 48-kbit display memory for high-refresh-rate LED panels. It is used in high-density video displays where precise grayscale fidelity and ghosting suppression are critical.
For engineers reviewing the TLC59581RTQT datasheet, TLC59581RTQT pinout, TLC59581RTQT application, or TLC59581RTQT equivalent, key selection criteria include its 32-line multiplexing capability, 65536-step grayscale resolution, integrated caterpillar cancellation circuitry, thermal shutdown (170°C threshold), and VQFN-56 package with exposed thermal pad for thermal management in compact LED backplane designs.
Technical Context
The TLC59581RTQT implements an ES-PWM architecture with dual 48-kbit SRAM banks (A/B) enabling seamless frame buffering and VSYNC-triggered bank swapping. Its 48 output channels are grouped into three color sets (R/G/B), each with independent 9-bit color brightness control (CC) and shared 3-bit global brightness control (BC).
It features a dedicated pre-charge FET per channel to suppress ghosting in multiplexed configurations, LOD circuitry with four programmable voltage thresholds (0.12–0.88 V), and low-grayscale enhancement (LGSE) logic that improves visual uniformity below 10% duty cycle. The device operates with 25 MHz serial data clock (SCLK) and 33 MHz grayscale clock (GCLK), supporting daisy-chained configurations via SIN/SOUT interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 48 constant-current sink outputs (16 red, 16 green, 16 blue), each independently PWM-controlled |
| Grayscale Resolution | 16-bit (65536 steps) per channel - enables smooth dimming without visible contouring in high-end signage |
| Max Sink Current | 25 mA per channel at VCC = 5.5 V - sufficient to drive standard 20-mA LEDs with margin for aging and temperature drift |
| Current Accuracy | ±3% max channel-to-channel, ±2% max device-to-device - ensures consistent luminance across multi-board LED arrays |
| Multiplex Support | 32-line multiplexing - allows high-resolution panels (e.g., 32×16 RGB subpixels) with minimal flicker and reduced MCU bandwidth load |
| LOD Thresholds | 4 programmable levels (0.12 V to 0.88 V) - configurable sensitivity for detecting open-circuit LEDs under varying VLED and PCB trace resistance |
| Thermal Protection | Thermal shutdown at 170°C ±10°C with 10°C hysteresis - prevents latch-up during sustained overcurrent or poor heatsinking |
Pinout & Package
VQFN-56 (RTQ) package, 8.00 mm × 8.00 mm body, 0.5 mm pitch, with exposed thermal pad soldered to GND for optimal thermal dissipation (RθJB = 5.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IREF | Reference current programming input | Connects external resistor to set full-scale output current; placement near IREFGND minimizes noise-induced current error |
| IREFGND | Analog ground reference for IREF | Dedicated AGND pin - must be routed separately to system power ground at single point to avoid digital noise coupling |
| GCLK | Grayscale PWM clock input | Rising edge increments GS counter; 33 MHz max frequency defines minimum line time in multiplexed operation |
| LAT | Data latch control input | Falling edge transfers shift register contents to GS memory or FC registers - timing-critical for avoiding partial-frame updates |
| SIN / SOUT | Serial data in/out | Enables daisy-chaining multiple TLC59581RTQT devices; SOUT of upstream feeds SIN of downstream |
| OUTR0–OUTR15 OUTG0–OUTG15 OUTB0–OUTB15 | Constant-current sink outputs | Three independent color groups; outputs within same group share CC register but retain individual GS data |
| Thermal Pad | Power ground / thermal path | Must be soldered to large copper pour tied to system GND - essential for maintaining TJ ≤ 125°C at full load |
Key Features
| Feature | Design Value |
|---|---|
| Pre-Charge FET per channel | Actively discharges LED node before turn-on to eliminate ghosting in high-speed multiplexed scanning |
| Enhanced caterpillar cancellation | Detects and compensates for open-LED-induced vertical streaks without requiring external circuitry or firmware intervention |
| Low-Grayscale Enhancement (LGSE) | Nonlinear GS counter mapping improves perceived brightness uniformity below 10% duty cycle |
| Dual 48-kbit SRAM banks | Enables concurrent display refresh (Bank A) and next-frame data loading (Bank B), eliminating visible tearing |
| IREF resistor short protection (ISP) | Shuts down reference path if IREF shorts to GND or VCC - prevents runaway current and thermal damage |
Applications
| High-Density Video Wall | Outdoor LED Signage |
|---|---|
Use Scenario: Modular 4K+ video wall using 32×16 RGB subpixel tiles with 1/32 scan rate. IC Role / Device Role / Timing Role: Primary constant-current sink driver managing all 48 channels per tile; synchronizes GS timing across daisy-chained units via GCLK and LAT. Use Value: 32-multiplex support and dual-SRAM banks enable 3840 Hz refresh without MCU bottleneck; LGSE ensures accurate black-level reproduction. | Use Scenario: Weatherproof roadside message sign with 16×16 RGB modules operating at –40°C to +85°C ambient. IC Role / Device Role / Timing Role: LED current controller with integrated LOD and thermal shutdown - autonomously flags failed LEDs and disables overheated sections. Use Value: ±2% device-to-device current matching ensures consistent brightness across field-replaced modules; VQFN-56 thermal pad sustains reliability under solar heating. |
| Studio-Grade Broadcast Display | AR/VR Micro-LED Backplane |
Use Scenario: HDR broadcast monitor requiring >10-bit perceptual grayscale and zero visible flicker at 120 Hz. IC Role / Device Role / Timing Role: High-fidelity grayscale engine delivering 65536-step PWM with sub-µs GCLK edge alignment across all 48 channels. Use Value: ES-PWM architecture eliminates LSB truncation artifacts; BC/CC registers allow real-time white-point calibration without interrupting display. | Use Scenario: Next-gen micro-LED array with ultra-small pitch (<50 µm) demanding precise per-pixel current control and minimal crosstalk. IC Role / Device Role / Timing Role: Precision sink driver with 25 mA max per channel and ±1% typical channel-to-channel error - critical for pixel-level luminance uniformity. Use Value: Pre-charge FET and optimized output stage reduce transient overshoot, preventing micro-LED degradation during rapid PWM switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59582RTQT | Same pinout and feature set, but supports only 16-multiplexing (vs. 32 for TLC59581RTQT); identical CC/BC/GS resolution and LOD functionality | Optimized for lower-resolution panels or systems where reduced scan rate simplifies LED column driver design | Select when panel height ≤ 16 lines or when lower GCLK bandwidth (≤16.5 MHz effective) suffices |
| IS31FL3731-QFLS4 | 28-channel, 8-bit PWM, no multiplex support; integrated auto-breathing and frame sync; I²C interface (vs. SPI-like serial on TLC59581RTQT) | Targeted at small-format UI lighting (keypads, status indicators), not video-grade multiplexed panels | Choose only for non-multiplexed, low-channel-count applications where I²C integration and smaller footprint outweigh grayscale depth needs |
Compared with TLC59582RTQT, the TLC59581RTQT enables higher panel resolution via 32-line multiplexing and tighter timing control; compared with IS31FL3731-QFLS4, it delivers 8× finer grayscale resolution, robust LOD, and true constant-current sink architecture suited for industrial LED video systems.
Availability
TLC59581RTQT is available at Aetrix Electronics and suitable for high-refresh-rate LED video walls, outdoor signage systems, and broadcast-grade display backplanes requiring stable component supply, long-term lifecycle support, and guaranteed thermal performance in extended temperature environments.
Supply support for TLC59581RTQT 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 ICs for industrial, automotive, and communications markets.
The TLC59581RTQT belongs to TI's high-performance LED driver product line, engineered specifically for high-density, high-refresh-rate multiplexed LED displays where grayscale fidelity, thermal resilience, and system-level reliability are non-negotiable.
FAQ
What is the maximum multiplexing ratio supported by the TLC59581RTQT?
The TLC59581RTQT supports up to 32-line multiplexing, enabling high-resolution LED panels with reduced MCU bandwidth requirements and minimized visual flicker. This is double the 16-line capability of the pin-compatible TLC59582RTQT variant. The 32-multiplex mode is enabled by internal line-read and sub-period counters synchronized to the GCLK signal, and is confirmed in the official datasheet SLVSCZ9A section 9.1 and device information table.
How does the LED Open Detection (LOD) function work on the TLC59581RTQT?
The TLC59581RTQT implements LOD by monitoring voltage at each OUTx pin during the off-phase of the PWM cycle. When an open LED causes the pin voltage to exceed one of four programmable thresholds (0.12 V to 0.88 V), the corresponding bit in the 48-bit LOD register is set. This register is readable via the serial interface using READSID or READFC1 commands. The LOD flag triggers no automatic action but provides diagnostic data for system-level fault handling - a feature explicitly detailed in sections 5 and 9.1 of the TLC59581RTQT datasheet.
Can the TLC59581RTQT drive LEDs with supply voltages above 5.5 V?
No - the TLC59581RTQT's VCC supply range is strictly 3.0 V to 5.5 V per Absolute Maximum Ratings (Section 7.1). However, its constant-current sink outputs (OUTR0–OUTB15) tolerate up to 11 V LED forward voltage (VLED), allowing use with high-VF LEDs (e.g., white or blue) powered from a separate 10 V rail. This separation of logic supply (VCC) and LED supply (VLED) is clearly specified in the "Recommended Operating Conditions" table (Section 7.3) and functional block diagram (Figure 16).
What is the purpose of the dual 48-kbit SRAM banks in the TLC59581RTQT?
The TLC59581RTQT integrates two independent 48-kbit SRAM banks (Bank A and Bank B) to enable seamless frame rendering: while one bank drives the active display, the other accepts new grayscale data via the serial interface. A VSYNC command swaps bank roles, eliminating visible tearing and enabling continuous 120+ Hz refresh rates without MCU intervention. This architecture - documented in Section 9.2 (Functional Block Diagram) and Section 9.3.3 (Vsync Command) - is essential for professional video applications where frame coherence is mandatory.
Does the TLC59581RTQT require external components for basic operation?
Yes - the TLC59581RTQT requires at minimum an external IREF resistor (connected between IREF and IREFGND) to set output current, and decoupling capacitors (recommended 100 nF ceramic + 10 µF tantalum per VCC pin) for stable power delivery. The thermal pad must be soldered to a GND plane. No external clock or pull-up resistors are needed: GCLK, SCLK, and LAT are driven externally, and internal weak pull-down (LAT) and pull-up (GCLK) resistors (250–750 kΩ) are provided per Section 7.5 Electrical Characteristics - eliminating need for discrete biasing in most layouts.
TLC59581RTQT 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):
- 5.5V
- Voltage - Output:
- 10V
- Current - Output / Channel:
- 25mA
- Frequency:
- -
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-QFN (8x8)
TLC59581RTQT FAQ
1.How can I place an order for TLC59581RTQT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC59581RTQT 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 TLC59581RTQT reliable?
The price and inventory of TLC59581RTQT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC59581RTQT is usually 5 days.
3.What payment methods are accepted for TLC59581RTQT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC59581RTQT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC59581RTQT?
TLC59581RTQT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC59581RTQT 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 TLC59581RTQT?
For technical support, including TLC59581RTQT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC59581RTQT requirements.
6.How does Aetrix verify that TLC59581RTQT is sourced from the original manufacturer or authorized distributors?
All TLC59581RTQT 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 TLC59581RTQT meets industry standards.
7.What is the process for return or replacement of TLC59581RTQT?
All TLC59581RTQT units undergo pre-shipment inspection (PSI). If there is an issue with TLC59581RTQT, 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 TLC59581RTQT part is unused and in its original packaging.
Return procedure for TLC59581RTQT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC59581RTQT Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
