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Texas Instruments LED171596ARSLR
- Part No.:
- LED171596ARSLR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
LED171596ARSLR.pdf
- Description:
- IC LED DRVR LIN I2C 15MA 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,401
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Product details
Overview
LED171596ARSLR from Texas Instruments is a 96-channel matrix LED driver IC for local dimming backlight and RGB/WLED control, featuring 24 programmable current sinks (60 mA peak, ±5% matching), four 1.5-A high-side PMOS switches, 9-bit per-LED PWM + 8-bit current control, and I²C/SPI/PWM interface support. It enables precise per-LED brightness in TV, monitor, and industrial display backlights.
For engineers reviewing the LED171596ARSLR datasheet, LED171596ARSLR pinout, LED171596ARSLR application, or LED171596ARSLR equivalent, key selection criteria include its 4×24 multiplexed architecture, ghosting cancellation, open/short LED fault detection, thermal shutdown, and VQFN-48 (6 mm × 6 mm) package with exposed thermal pad.
Technical Context
The LED171596ARSLR implements a time-multiplexed 4-phase matrix drive scheme: four high-side switches (HS0–HS3) sequentially activate groups of 24 LEDs connected to low-side current sinks (LED0–LED23), enabling full 96-LED control. Each sink supports independent 9-bit PWM duty cycle and 8-bit current scaling, with global brightness modulation via register or SS_PWM pin.
Its dual-interface logic uses IFSEL_LATCH to select I²C (fast-mode-plus, 1 MHz) or SPI (10 MHz) after EN assertion, while internal brightness sloper enables optically smooth transitions without host intervention. Fault handling includes per-LED open/short detection with interrupt reporting on INT pin and automatic thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 96 total (4 × 24 matrix via 4 HS switches + 24 LS sinks) |
| Max Sink Current | 60 mA peak per channel; average limited to 15 mA due to 4-phase multiplexing |
| Current Matching | ±5% across all 24 sinks - ensures uniform brightness in multi-LED zones |
| PWM Resolution | 9-bit per LED - 512-step grayscale control for flicker-free dimming |
| High-Side RDS(on) | 80–330 mΩ (VLED ≥ 4 V) - minimizes power loss in high-current LED anode paths |
| Fault Detection | Open-LED and shorted-LED sensing per channel with status register and INT assertion |
| Thermal Protection | 150°C shutdown with 20°C hysteresis - prevents die damage under sustained overload |
Pinout & Package
VQFN-48 package (6.00 mm × 6.00 mm) with exposed thermal pad (EPAD) requiring solder connection to GND for thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,2,3,30,45–48) | Ground reference | Separate analog/digital ground return paths; EPAD must connect to same plane |
| ISET | Analog current reference | Resistor sets global max sink current (e.g., 12.5 kΩ → 60 mA peak) |
| LED0–LED23 | Constant-current sink outputs | 24 low-side drivers; each connects to cathode of 4 LEDs (total 96) |
| HS0–HS3 | High-side PMOS switch outputs | 4 anode supply switches; each enables one 24-LED group during multiplex phase |
| VLED | High-side power input | 6.1 V max input; supplies HS switches and defines LED forward voltage headroom |
| VDD / VDDIO | Digital/analog supply rails | VDD = 2.9–3.5 V (core logic); VDDIO = 1.65–3.5 V (I/O level setting) |
| EN | Enable input | Active-high; initiates interface initialization and timing sequence (tEN = 5 ms) |
| IFSEL_LATCH | Interface select / latch control | High = I²C mode (with ADDR/MOSI_SDA); Low = SPI mode; rising edge latches SRAM updates |
| SCLK_SCL / MOSI_SDA / MISO_ADDR / SS_PWM | Serial interface signals | Configurable I²C (SCL/SDA/ADDR) or SPI (SCLK/MOSI/MISO/SS); SS_PWM doubles as global PWM input in I²C mode |
| INT | Open-drain interrupt output | Asserts low on fault (open/short LED, thermal shutdown) or sloper completion; requires external pull-up to VDDIO |
Key Features
| Feature | Design Value |
|---|---|
| Ghosting cancellation | Hardware-enabled matrix sequencing eliminates crosstalk between active/inactive LED groups |
| Brightness sloper | On-chip interpolation engine creates smooth brightness transitions using single register write - no host CPU overhead |
| Per-LED current tuning | 8-bit LEDXX_CUR registers allow fine-grained current trimming to compensate for binning or aging drift |
| Multi-interface flexibility | Pin-selectable I²C or SPI avoids redesign when changing host controller interface requirements |
| Robust fault coverage | Dedicated open/short detection per sink with maskable status bits and non-latching interrupt behavior |
Applications
| TV Local Dimming Backlight | Industrial Control Panel Illumination |
|---|---|
Use Scenario: 4K UHD LCD TV with 96-zone dynamic backlight for contrast enhancement and HDR compliance. IC Role / Device Role / Timing Role: LED171596ARSLR drives 96 individually dimmed LED strings in 4-phase time-multiplexed mode, synchronized to panel refresh timing. Use Value: Enables >100,000:1 contrast ratio via per-zone luminance control; ±5% current matching ensures uniform zone brightness without visible banding. |
Use Scenario: Operator interface panel in factory automation equipment requiring high-reliability, low-flicker status indicators. IC Role / Device Role / Timing Role: LED171596ARSLR serves as centralized LED manager for 96 status LEDs (power, alarm, comms, I/O), driven via I²C from MCU. Use Value: Single-chip solution reduces BOM count vs discrete drivers; thermal shutdown and fault reporting improve system diagnostics and uptime. |
| Medical Imaging Display Backlight | Automotive Infotainment Display |
Use Scenario: Diagnostic-grade medical monitor requiring DICOM-compliant grayscale accuracy and zero flicker. IC Role / Device Role / Timing Role: LED171596ARSLR delivers stable, calibrated LED current with 9-bit PWM and 8-bit current scaling per channel under MCU supervision. Use Value: 512-step PWM resolution eliminates visible stepping in low-brightness diagnostic modes; ±5% matching maintains grayscale linearity across display area. |
Use Scenario: Automotive center-stack display with ambient light adaptive backlight and ASIL-B functional safety awareness. IC Role / Device Role / Timing Role: LED171596ARSLR controls RGB backlight LEDs in 4×24 configuration, interfacing via SPI to automotive MCU with fault logging. Use Value: Open/short LED detection and INT reporting enable fail-safe dimming fallback; thermal shutdown meets AEC-Q100 transient robustness requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED matrix driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947 | 24-channel constant-current sink only; no high-side switches; 12-bit PWM; requires external high-side FETs for matrix operation | Best for simpler 24-LED arrays or designs where high-side control is handled separately | Select TLC5947 when per-channel resolution >9-bit is required and matrix complexity is low |
| IS31FL3731 | 28-channel matrix driver (4×7); integrated charge pump; 8-bit PWM; no ISET resistor; lower max current (40 mA) | Suitable for compact UI displays (keypads, small panels) but lacks 96-channel scalability and high-current capability | Choose IS31FL3731 for space-constrained, low-power indicator applications with integrated boost |
Compared with TLC5947 and IS31FL3731, LED171596ARSLR uniquely integrates both 24 high-precision sinks and four 1.5-A high-side switches in one VQFN-48 package, enabling true 96-LED local dimming without external switching components - critical for large-area, high-brightness displays.
Availability
LED171596ARSLR is available at Aetrix Electronics and suitable for TV backlight systems, industrial HMI panels, medical imaging displays, and automotive infotainment requiring stable component supply and long-term production continuity.
Supply support for LED171596ARSLR 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 power management technologies with over 50 years of innovation in precision analog ICs.
The LED171596ARSLR belongs to TI's high-performance LED driver product line, designed specifically for local dimming backlight applications demanding high channel count, tight current matching, and integrated fault protection.
FAQ
What is the maximum number of LEDs the LED171596ARSLR can drive?
The LED171596ARSLR drives up to 96 LEDs using a 4×24 matrix architecture: 24 low-side current sinks (LED0–LED23) are time-multiplexed across four high-side switches (HS0–HS3), with each sink controlling four LEDs (one per phase). This configuration is fixed and cannot be reconfigured for other topologies.
How does the LED171596ARSLR achieve ±5% current matching across channels?
The LED171596ARSLR achieves ±5% current matching through laser-trimmed internal current references and matched transistor layouts in its 24 low-side sink array. Matching is specified at 60 mA peak with 100% PWM duty cycle and validated over –40°C to +85°C ambient temperature - no external calibration is required for this spec.
Can the LED171596ARSLR operate with a 5-V VLED supply?
Yes - the LED171596ARSLR supports VLED from 6.1 V minimum (per Recommended Operating Conditions), so 5 V is below specification and not supported. Using 5 V risks insufficient headroom for HS switch operation and may cause premature saturation or open-LED false positives. Minimum VLED is strictly 6.1 V.
Does the LED171596ARSLR support daisy-chaining multiple devices?
No - the LED171596ARSLR does not support hardware daisy-chaining. Each device requires dedicated SCLK_SCL, MOSI_SDA, and MISO_ADDR connections. Multiple units can be controlled on the same I²C bus using unique slave addresses (set via MISO_ADDR pin) or on separate SPI buses with individual SS_PWM lines.
What is the function of the ISET pin on the LED171596ARSLR?
The ISET pin on the LED171596ARSLR accepts an external resistor (RISET) to set the global maximum current for all 24 current sinks using the formula IMAX = 750 Ω / RISET. For example, a 12.5-kΩ resistor sets 60 mA peak per sink. This analog reference enables precise, temperature-stable current scaling without digital register writes.
LED171596ARSLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- No
- Number of Outputs:
- 96
- Voltage - Supply (Min):
- 1.65V
- Voltage - Supply (Max):
- 3.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 15mA
- Frequency:
- -
- Dimming:
- I2C, SPI, PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-VQFN (6x6)
LED171596ARSLR FAQ
1.How can I place an order for LED171596ARSLR through Aetrix?
Please submit a Request for Quotation (RFQ) for LED171596ARSLR 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 LED171596ARSLR reliable?
The price and inventory of LED171596ARSLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LED171596ARSLR is usually 5 days.
3.What payment methods are accepted for LED171596ARSLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LED171596ARSLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LED171596ARSLR?
LED171596ARSLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LED171596ARSLR 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 LED171596ARSLR?
For technical support, including LED171596ARSLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LED171596ARSLR requirements.
6.How does Aetrix verify that LED171596ARSLR is sourced from the original manufacturer or authorized distributors?
All LED171596ARSLR 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 LED171596ARSLR meets industry standards.
7.What is the process for return or replacement of LED171596ARSLR?
All LED171596ARSLR units undergo pre-shipment inspection (PSI). If there is an issue with LED171596ARSLR, 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 LED171596ARSLR part is unused and in its original packaging.
Return procedure for LED171596ARSLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LED171596ARSLR Tags
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