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Texas Instruments LP5891RRFR
- Part No.:
- LP5891RRFR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 76-VFQFN Exposed Pad
- Datasheet:
-
LP5891RRFR.pdf
- Description:
- 48 16 LED MATRIX DRIVER WITH 16-
- Quantity:
- Payment:
- Shipping:
Inventory:1,901
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Product details
Overview
LP5891RRFR from Texas Instruments is a 48-channel common-cathode RGB LED matrix driver with 16 scan-line FETs, operating at VCC = VR = 2.8 V and VG/B = 3.8 V over –40°C to +85°C ambient. It delivers 0.2–20 mA per channel with ±0.5% (typ.) channel-to-channel current accuracy, 190-mΩ RDS(ON) scan switches, and supports up to 64×64 RGB pixel arrays via four-device stacking - used in high-fidelity gaming keyboard backlighting and mini-LED luminous panels.
For engineers reviewing the LP5891RRFR datasheet, LP5891RRFR pinout, LP5891RRFR application, or LP5891RRFR equivalent, key selection criteria include its triple independent LED supply rails (VR/VG/VB), 16-bit PWM grayscale control, built-in LED open/weak-short/short detection, low-knee-voltage constant-current outputs (0.26 V max @ 5 mA), and CCSI interface with only three wires (SCLK/SIN/SOUT) for daisy-chained configurations.
Technical Context
The LP5891RRFR implements a rising-edge transmission CCSI interface supporting up to 50-MHz external SCLK and internal GCLK up to 160 MHz, enabling high-refresh-rate daisy-chained LED matrices with minimized EMI. Its architecture separates logic (VCC), red (VR), green (VG), and blue (VB) power domains to optimize forward voltage headroom and thermal management across color channels.
It integrates 48 programmable constant-current sinks grouped as R0–R15, G0–G15, B0–B15, each adjustable via external IREF resistor and two-tier brightness control: 3-bit global (8-step) and 8-bit per-color (256-step), plus 16-bit PWM for fine grayscale resolution. Built-in diagnostics detect LED open, weak-short, and short faults during operation and report status to host controller.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.5 V–5.5 V - enables direct connection to standard 3.3 V or 5 V system rails without LDO overhead. |
| Output Current Range | 0.2 mA–20 mA per channel - supports dimmable micro-LEDs and high-brightness RGB pixels with single-resistor calibration. |
| Channel Accuracy | ±0.5% (typ.), ±2% (max.) - ensures uniform luminance across 48 outputs without per-channel trimming. |
| Knee Voltage | 0.26 V (max.) @ 5 mA - minimizes voltage headroom loss, allowing use with low-Vf LEDs or tight supply margins. |
| RDS(ON) (Scan Switches) | 190 mΩ - reduces conduction loss and self-heating in 16 multiplexed line drivers driving up to 2 A total. |
| Operating Temp | –40°C to +85°C - qualified for industrial and consumer-grade display applications with no derating required. |
| Interface | 3-wire CCSI (SCLK/SIN/SOUT) - eliminates CS/SS pin, simplifies PCB routing, and supports >10-device daisy chains. |
Pinout & Package
LP5891RRFR uses a 76-pin VQFN package (9 mm × 9 mm) with exposed thermal pad. Thermal pad must be soldered to GND plane for thermal integrity and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IREF | Current reference input | Connects external resistor to set full-scale output current; open or grounded disables all channels. |
| VCC | Digital core supply | Powers logic, SRAM, and interface circuitry; independent of LED supplies for noise isolation. |
| VR / VG / VB | Red/Green/Blue LED anode supplies | Separate rails allow optimal forward voltage matching per color, improving efficiency and color fidelity. |
| R0–R15 / G0–G15 / B0–B15 | Constant-current sink outputs | 48 dedicated channels grouped by color; each drives one LED cathode in common-cathode matrix. |
| LINE0–LINE15 | Scan-line FET outputs | 16 high-current (≤2 A) switches controlling row/anode activation; RDS(ON) = 190 mΩ @ 2.8 V. |
| SCLK / SIN / SOUT | CCSI serial interface | Rising-edge clocked 3-wire daisy-chain interface; SOUT of one device connects to SIN of next. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent LED supplies | VR/VG/VB rails decouple color-specific voltage requirements, enabling precise Vf compensation and reducing cross-color crosstalk. |
| 16-bit PWM grayscale control | 65,536-step intensity resolution per channel - eliminates visible contouring in gradient displays and video content. |
| Built-in LED fault detection | Real-time open, weak-short, and short detection per channel with status reporting - eliminates need for external sense resistors or ADC monitoring. |
| Stackable architecture | Four LP5891RRFR devices support 64×64 RGB pixel arrays via shared scan-line control - reduces system-level component count vs discrete drivers. |
| Intelligent power save mode | ICC drops to 0.9 mA when idle - extends battery life in portable LED interfaces without sacrificing wake-up latency. |
Applications
| Gaming Keyboard Backlighting | Mini-LED Matrix Displays |
|---|---|
|
Use Scenario: High-density RGB illumination of mechanical keycaps with per-key animation and dynamic lighting effects. IC Role / Device Role / Timing Role: LP5891RRFR acts as the primary column driver, sourcing precise current to 48 individual LED cathodes while scanning 16 rows via integrated FETs. Use Value: 0.5% channel accuracy ensures consistent brightness across keys; 16-bit PWM prevents banding in animated gradients; CCSI interface allows compact MCU-to-driver wiring. |
Use Scenario: Driving sub-100 µm pitch RGB micro-LED arrays in AR/VR near-eye displays and ultra-thin luminous panels. IC Role / Device Role / Timing Role: LP5891RRFR serves as a high-resolution, low-knee-voltage constant-current sink array, enabling efficient drive of low-Vf micro-LEDs in common-cathode topology. Use Value: 0.26 V knee voltage maximizes usable voltage margin; triple independent supplies match disparate R/G/B Vf curves; built-in fault detection improves panel yield and reliability. |
| Audio Mixer & Broadcast Equipment | Local Dimming Backlight Units |
|
Use Scenario: Status and level indication on professional audio gear with multi-color, high-refresh-rate LED bar graphs and metering displays. IC Role / Device Role / Timing Role: LP5891RRFR functions as a real-time LED driver with synchronized PWM updates, supporting >1 kHz refresh rates for flicker-free visual feedback. Use Value: 50-MHz CCSI interface enables fast frame loading; 3-bit global + 8-bit per-color control allows independent gain tuning for red/green/yellow signal thresholds; thermal shutdown (170°C) protects against sustained overdrive. |
Use Scenario: Zone-based dimming control in LCD TV backlights using segmented LED arrays for contrast enhancement. IC Role / Device Role / Timing Role: LP5891RRFR operates as a local dimming zone driver, delivering tightly regulated current to groups of white LEDs arranged in 16×N zones. Use Value: ±2% max channel deviation ensures uniform zone luminance; 190-mΩ RDS(ON) minimizes power loss in high-current scan lines; stackable mode scales to 64-zone systems with four ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGB LED matrix driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59582RTQR | 48-channel, 16-bit PWM, but uses SPI interface (4-wire) and lacks independent VR/VG/VB supplies - single VLED rail only. | Requires external level-shifting for mixed-Vf LEDs; no built-in LED fault detection; lower max SCLK (30 MHz). | Prefer LP5891RRFR when triple LED supplies, CCSI simplicity, or diagnostic capability are required. |
| IS31FL3733-QFLS4 | 48-channel, 16-bit PWM, I²C interface, integrated charge pump - supports higher VLED but no scan-line FETs (requires external row drivers). | Needs external high-current row switches; no native 16-line multiplexing; limited to –40°C to +85°C same as LP5891RRFR. | Choose LP5891RRFR for fully integrated scan + sink solution; IS31FL3733 suits designs with existing row drivers or I²C-only infrastructure. |
Compared with TLC59582RTQR and IS31FL3733-QFLS4, the LP5891RRFR uniquely combines independent RGB supplies, integrated 16-line scanning FETs, and CCSI daisy-chaining - reducing BOM count and layout complexity for high-channel-count, high-fidelity LED matrices.
Availability
LP5891RRFR is available at Aetrix Electronics and suitable for gaming peripherals, broadcast equipment UIs, mini-LED luminous panels, and local dimming backlight units requiring stable component supply and long-term production continuity.
Supply support for LP5891RRFR 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 U.S.-based semiconductor company specializing in analog and embedded processing solutions, with leadership in precision power management and high-performance LED drivers.
The LP5891RRFR belongs to TI's LP58xx family of high-integration RGB LED drivers, designed specifically for demanding display applications requiring high channel count, tight current matching, and robust fault diagnostics in space-constrained layouts.
FAQ
What is the maximum ambient temperature rating for LP5891RRFR?
The LP5891RRFR is rated for operation from –40°C to +85°C ambient temperature. This specification is explicitly confirmed in the datasheet's Recommended Operating Conditions table for LP5891RRFR and LP5891ZXLR variants. Junction temperature may reach up to 150°C under normal operation, supported by its RθJA of 22.2°C/W in the VQFN package.
Does LP5891RRFR support daisy-chaining with other LP5891 devices?
Yes, LP5891RRFR supports daisy-chaining via its Continuous Clock Series Interface (CCSI) using SCLK, SIN, and SOUT pins. Up to four LP5891RRFR devices can be stacked to drive larger matrices (e.g., 64×64 RGB pixels), with configurable scan sequencing (MOD_SIZE and SCAN_REV registers) to maintain correct line order across devices.
How is output current calibrated on LP5891RRFR?
LP5891RRFR output current is calibrated using an external resistor connected between IREF and GND. The nominal IREF voltage is 0.8 V, and the full-scale current per channel is calculated as IOUT = 0.8 V / RIREF × GAINBC, where GAINBC is set by the 3-bit global brightness register. Channel-to-channel accuracy remains ±0.5% (typ.) across the 0.2–20 mA range.
What fault detection capabilities does LP5891RRFR provide?
LP5891RRFR provides real-time per-channel LED open, weak-short, and short detection during active operation. Detected faults are reported through status registers accessible via the CCSI interface, enabling host MCU to isolate and disable faulty LEDs without external sensing components or firmware overhead.
Is LP5891RRFR pin-compatible with other LP5891 variants like LP5891ZXLR?
No - LP5891RRFR (76-pin VQFN) and LP5891ZXLR (96-pin BGA) use different packages and pinouts. While functionally identical in core features and register mapping, they are not mechanically or electrically pin-compatible. Board designs must be re-routed when switching between RRF and ZXL packages.
LP5891RRFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 76-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 48
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 20mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 76-VQFN (9x9)
LP5891RRFR FAQ
1.How can I place an order for LP5891RRFR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5891RRFR 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 LP5891RRFR reliable?
The price and inventory of LP5891RRFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5891RRFR is usually 5 days.
3.What payment methods are accepted for LP5891RRFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5891RRFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5891RRFR?
LP5891RRFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5891RRFR 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 LP5891RRFR?
For technical support, including LP5891RRFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5891RRFR requirements.
6.How does Aetrix verify that LP5891RRFR is sourced from the original manufacturer or authorized distributors?
All LP5891RRFR 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 LP5891RRFR meets industry standards.
7.What is the process for return or replacement of LP5891RRFR?
All LP5891RRFR units undergo pre-shipment inspection (PSI). If there is an issue with LP5891RRFR, 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 LP5891RRFR part is unused and in its original packaging.
Return procedure for LP5891RRFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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