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Texas Instruments LP5868RKPR
- Part No.:
- LP5868RKPR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
LP5868RKPR.pdf
- Description:
- IC LED DRVR LIN PWM 50MA 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,249
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Product details
Overview
LP5868RKPR from Texas Instruments is an 8 × 18 LED matrix driver IC with integrated high-side PMOS scan switches and 18 precision constant-current sinks, supporting up to 144 individually addressable LED dots or 48 RGB pixels via time-multiplexed scanning. It delivers 0.1–50 mA per sink (VCC ≥ 3.3 V), ±3% device-to-device and channel-to-channel current matching at 50 mA, and supports both 8-bit analog dimming and 8-/16-bit audible-noise-free PWM dimming - used in smart speaker status lighting and gaming peripheral animations.
For engineers reviewing the LP5868RKPR datasheet, LP5868RKPR pinout, LP5868RKPR application, or LP5868RKPR equivalent, this page provides verified technical context, validated pin functions for the RKP (VQFN-40) package, confirmed SRAM-based frame control architecture, real-world deghosting implementation details, and two rigorously cross-referenced alternative parts for LED matrix design continuity.
Technical Context
The LP5868RKPR implements a time-multiplexed 8-line × 18-sink matrix architecture using eight integrated high-side p-channel MOSFETs and 18 matched current sinks. Its internal 32 MHz oscillator feeds configurable 62.5 kHz or 125 kHz PWM generators per LED dot, with programmable phase shift (0/125 ns) and switch blank time (0.5/1 μs) to balance transient power and minimize ghosting.
It integrates full-addressable SRAM for partial or full frame updates, hardware-assisted open/short detection per sink (VLOD_TH = 0.25 V, VLSD_TH = VLED – 1 V), and three-stage low-brightness compensation grouped across CS0–CS17. Deghosting includes active pre-charge (downside) and scan-line discharge (upside), both register-configurable via Dev_config3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC / VLED Range | 2.7 V to 5.5 V - enables single-supply operation across 3.3 V and 5 V systems without level-shifting. |
| Constant Current Sink Range | 0.1 mA to 50 mA (VCC ≥ 3.3 V) - supports dimmable indicator LEDs and high-brightness RGB pixels. |
| Current Matching Accuracy | ±3% device-to-device and channel-to-channel error at 50 mA - ensures uniform luminance across 144-dot matrices. |
| PWM Frequency Options | 62.5 kHz or 125 kHz - eliminates audible noise while enabling smooth animation at >20 kHz. |
| Interface Speed | Up to 12 MHz SPI or 1 MHz I²C - allows rapid frame data loading for dynamic UI effects. |
| Power Modes | Shutdown ICC ≤ 1 μA, Standby ICC ≤ 10 μA, Active ICC = 4.3 mA (typ., 5 mA sink) - optimizes battery life in portable devices. |
| Thermal Shutdown | 150 °C with 15 °C hysteresis - protects against thermal runaway during sustained high-current operation. |
Pinout & Package
The LP5868RKPR is packaged in a 40-pin VQFN (RKP) with 5.00 mm × 5.00 mm body size and exposed thermal pad. Pin functions are validated per TI SNVSC36A datasheet Rev. September 2024.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS0–CS17 | Constant-current sink outputs | 18 dedicated low-side drivers; each sinks up to 50 mA with ±3% matching - directly connect LED cathodes. |
| SW0–SW7 | High-side PMOS scan switches | 8 integrated p-channel FETs for row selection; support 1–8 active scan lines - drive LED anodes in multiplexed topology. |
| VLED | High-side power supply input | Supplies scan switches; independent of VCC - allows separate LED voltage optimization (e.g., 5 V for white LEDs). |
| VCC | Core logic and LDO input | Power for digital core and internal 1.8 V LDO; requires 1 μF decoupling - sets operating voltage for registers and interface. |
| VIO_EN | Digital I/O supply and chip enable | Accepts 1.65–5.5 V; powers I²C/SPI logic and enables device - supports mixed-voltage host MCU interfaces. |
| IFS | Interface select | Logic-level input: Low = I²C mode (≤1 MHz), High = SPI mode (≤12 MHz) - configures physical layer without firmware change. |
| SCL_SCLK / SDA_MOSI / ADDR0_MISO / ADDR1_SS | Configurable dual-mode interface pins | Shared I²C/SPI signals; direction and function determined by IFS state - reduces PCB routing complexity. |
| VCAP | Internal LDO output | 1.8 V regulated output; requires 1 μF ceramic capacitor to GND - powers analog blocks and ensures stable current reference. |
| AGND / GND | Analog and power ground | Must be connected to exposed thermal pad and common ground plane - critical for current sink accuracy and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Full-addressable SRAM | Enables partial frame updates - reduces host MCU bandwidth usage and minimizes bus traffic during animation playback. |
| Hardware deghosting | Configurable upside (scan-line discharge) and downside (current-sink pre-charge) circuits - eliminates crosstalk without software overhead. |
| Three-group low-brightness compensation | Independent adjustment for CS0/3/6/9/12/15, CS1/4/7/10/13/16, CS2/5/8/11/14/17 - corrects color shift and non-uniformity below 10% duty cycle. |
| Individual 8-/16-bit PWM per LED | Per-dot resolution enables microsecond-level brightness control - supports HDR-like contrast in compact LED arrays. |
| Open/short detection per sink | Automatic fault reporting via register flags (VLOD_TH = 0.25 V, VLSD_TH = VLED – 1 V) - enables real-time LED health monitoring. |
Applications
| Smart Speaker Status Lighting | Gaming Keyboard Backlighting |
|---|---|
|
Use Scenario: Real-time visual feedback for voice assistant wake words, volume changes, and connection status on compact smart speakers. IC Role / Device Role / Timing Role: LED matrix driver managing 144-dot circular or linear array with synchronized PWM timing and ghost-free scanning. Use Value: Enables smooth breathing, pulsing, and color-transition animations using 8-/16-bit per-dot PWM - no audible coil whine at any brightness level. |
Use Scenario: Per-key RGB backlighting with dynamic macro indicators and reactive lighting on mechanical gaming keyboards. IC Role / Device Role / Timing Role: Constant-current sink controller driving 144 discrete LEDs in 8×18 grid; handles rapid frame updates via 12 MHz SPI. Use Value: Delivers uniform luminance across all keys via ±3% current matching and eliminates ghosting during fast keypress sequences. |
| Audio Mixer Channel Indicators | Smart Home Appliance UI Panels |
|
Use Scenario: Visual gain staging, clipping alerts, and signal routing indicators on professional DJ mixers and broadcast consoles. IC Role / Device Role / Timing Role: High-precision current sink driver with open/short detection - monitors LED health across 144 status points. Use Value: Ensures reliable visual feedback under continuous operation using thermal shutdown (150 °C) and robust 2.7–5.5 V supply range. |
Use Scenario: Animated status icons and touch-responsive feedback on refrigerator displays, washing machine control panels, and HVAC interfaces. IC Role / Device Role / Timing Role: Low-power LED driver supporting standby ICC ≤ 10 μA and shutdown ICC ≤ 1 μA - extends appliance standby life. Use Value: Maintains consistent color fidelity at low brightness via three-group compensation - critical for readability in ambient light. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED matrix driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5866RKPR | 6 × 18 matrix (108 dots); identical pinout, register map, and feature set except for 2 fewer scan switches. | Lower LED count support; suitable where 144-dot density is unnecessary and BOM cost reduction is prioritized. | Select LP5866RKPR when designing for ≤108 LED dots and requiring drop-in compatibility with existing LP5868 layout. |
| LP5860RKPR | 11 × 18 matrix (198 dots); same RKP package and interface, but adds three extra scan switches and extended temp option. | Higher-density applications such as large-format status bars or multi-zone industrial HMI panels. | Choose LP5860RKPR only if 198-dot capacity is required; note that SW8–SW10 pins are unused on LP5868RKPR layouts. |
Compared with LP5866RKPR, LP5868RKPR adds two scan switches for 144-dot support while retaining identical current sink specs, SRAM architecture, and deghosting logic - making it the minimal upgrade path for higher-resolution LED UIs. LP5860RKPR extends further but introduces unused pins in LP5868 footprints.
Availability
LP5868RKPR is available at Aetrix Electronics and suitable for smart speaker lighting, gaming peripheral backlighting, and audio mixer status indication requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP5868RKPR 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 and embedded processing technologies, with decades of expertise in precision power management and LED driver innovation.
The LP586x family was designed specifically for high-density, low-noise LED matrix applications in consumer audio, gaming peripherals, and smart home interfaces - emphasizing current matching, flexible dimming, and robust fault detection.
FAQ
What is the maximum number of LEDs the LP5868RKPR can drive?
The LP5868RKPR drives up to 144 individual LED dots (8 rows × 18 columns) or 48 RGB pixels using time-multiplexed scanning. This is achieved via eight integrated high-side PMOS switches (SW0–SW7) and 18 precision constant-current sinks (CS0–CS17). Each sink supports 0.1–50 mA, and the device maintains ±3% current matching across all channels at full scale - ensuring uniform brightness in high-density arrays. The LP5868RKPR datasheet confirms this 8×18 topology in Section 7.1 and Table 4.
Does the LP5868RKPR support both I²C and SPI interfaces?
Yes, the LP5868RKPR supports both I²C and SPI through shared pins configured by the IFS input. When IFS is low, SCL_SCLK, SDA_MOSI, ADDR0_MISO, and ADDR1_SS operate as I²C signals (≤1 MHz). When IFS is high, they become SPI signals (SCLK, MOSI, MISO, SS) supporting up to 12 MHz. This dual-mode capability is documented in Section 5 (Pin Functions) and Section 7.3.3 of the LP5868RKPR datasheet, enabling flexible host MCU integration without additional level shifters or protocol converters.
How does the LP5868RKPR handle LED open-circuit and short-circuit faults?
The LP5868RKPR implements per-sink open- and short-detection circuitry with fixed thresholds: VLOD_TH = 0.25 V for open detection and VLSD_TH = VLED – 1 V for short detection. Fault status is reported via dedicated register bits, allowing host firmware to identify failed LEDs without external sensing components. This functionality is validated in Section 6.5 (Electrical Characteristics) and Section 7.3.6 of the official datasheet, and operates independently of dimming mode or scan configuration.
What thermal management features does the LP5868RKPR include?
The LP5868RKPR includes junction-temperature-based thermal shutdown at 150 °C with 15 °C hysteresis (TTSD and THYS parameters), preventing damage during sustained high-current operation. Its RKP (VQFN-40) package features an exposed thermal pad that must be soldered to AGND and the PCB ground plane to achieve RθJB = 12.0 °C/W. Thermal metrics and layout guidance are specified in Section 6.4 and Section 8.4 of the LP5868RKPR datasheet, ensuring reliable operation up to +85 °C ambient.
Can the LP5868RKPR achieve flicker-free LED dimming at low brightness levels?
Yes, the LP5868RKPR achieves flicker-free dimming at low brightness using three complementary techniques: (1) 8-/16-bit per-LED PWM with >20 kHz frequencies (62.5/125 kHz), eliminating audible noise and visible flicker; (2) hardware-based upside/downside deghosting to suppress crosstalk artifacts; and (3) three-group low-brightness compensation to correct color shift and non-uniformity below 10% duty cycle. These capabilities are detailed in Sections 7.3.1 and 7.3.2 of the LP5868RKPR datasheet and validated in typical characteristics Figures 6-3 through 6-10.
LP5868RKPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Constant Current
- Internal Switch(s):
- Yes
- Number of Outputs:
- 18
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 50mA
- Frequency:
- 31.2MHz
- Dimming:
- Analog, PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VQFN (5x5)
LP5868RKPR FAQ
1.How can I place an order for LP5868RKPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5868RKPR 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 LP5868RKPR reliable?
The price and inventory of LP5868RKPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5868RKPR is usually 5 days.
3.What payment methods are accepted for LP5868RKPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5868RKPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5868RKPR?
LP5868RKPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5868RKPR 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 LP5868RKPR?
For technical support, including LP5868RKPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5868RKPR requirements.
6.How does Aetrix verify that LP5868RKPR is sourced from the original manufacturer or authorized distributors?
All LP5868RKPR 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 LP5868RKPR meets industry standards.
7.What is the process for return or replacement of LP5868RKPR?
All LP5868RKPR units undergo pre-shipment inspection (PSI). If there is an issue with LP5868RKPR, 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 LP5868RKPR part is unused and in its original packaging.
Return procedure for LP5868RKPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5868RKPR Tags
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