Texas Instruments LP5866TRKPR

Overview

LP5866TRKPR from Texas Instruments is a 6 × 18 high-current LED matrix driver IC with 18 constant current sinks (100 mA max per sink at VCC ≥ 3.3 V), 6 integrated high-side PMOS scan switches, and support for both 8-bit and 16-bit per-dot PWM dimming. It enables 108-LED dot control or 36 RGB pixel driving in smart home appliance indicators, keyboard backlighting, and IP camera IR modules.

For engineers reviewing the LP5866TRKPR datasheet, LP5866TRKPR pinout, LP5866TRKPR application, or LP5866TRKPR equivalent, key selection criteria include its dual I²C/SPI interface (1 MHz / 12 MHz), full addressable SRAM architecture, individual dot open/short detection, de-ghosting circuitry, and low-brightness compensation across three configurable current groups.

Technical Context

The LP5866TRKPR implements time-multiplexed scanning using six high-side PMOS switches and eighteen current sinks, enabling up to 108 individually addressable LED dots. Its analog dimming path uses global 3-bit Maximum Current (7.5–100 mA), three 7-bit Color Current groups, and per-sink 8-bit Dot Current correction - all combined multiplicatively per Equation (3) in the datasheet.

PWM control includes individual 8-bit or 16-bit registers per LED, three programmable 8-bit group PWMs, and global 8-bit PWM - with final duty calculated as the product of all three. Phase-shifted PWM (125 ns shift) across three current-sink groups reduces input ripple and audible capacitor noise, while internal 32 MHz oscillator (±3% accuracy) ensures synchronization across multiple devices.

Key Specifications

Pinout & Package

VQFN-40 package (RKP), 5.00 mm × 5.00 mm body size, with exposed thermal pad connected to AGND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED matrix driver applications.

Compared with LP5866TRKPR, LP5866TMRKPR offers identical electrical performance with improved manufacturability, while LP5864MRSMR trades resolution, current drive, and synchronization capability for reduced footprint and cost - making it unsuitable for 108-dot or synchronized multi-chip systems.

Availability

LP5866TRKPR is available at Aetrix Electronics and suitable for smart home appliance indicators, RGB keyboard backlighting, and IP camera IR illumination requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LP5866TRKPR 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 and embedded processing technologies, with leadership in precision analog, power management, and interface solutions.

The LP5866TRKPR belongs to TI's LP586xx family of high-current LED matrix drivers, designed specifically for high-fidelity, low-noise, and thermally robust LED animation in consumer and industrial human-machine interfaces.

FAQ

What is the maximum LED dot count supported by the LP5866TRKPR?

The LP5866TRKPR supports up to 108 LED dots using its 6 high-side scan switches and 18 constant current sinks in a time-multiplexed matrix configuration. This corresponds to 36 RGB pixels (3 channels × 36 positions). The device does not support more than 6 scan lines - unlike LP5860TRKPR (11 lines) or LP5868TRKPR (8 lines) - and cannot be reconfigured beyond 108 dots. LP5866TRKPR achieves this with no external row drivers required.

Does the LP5866TRKPR support both I²C and SPI interfaces simultaneously?

No, the LP5866TRKPR supports either I²C or SPI - not both at once. Interface selection is controlled by the IFS pin: IFS = Low configures I²C (SCL_SCLK/SDA_MOSI/ADDR0_MISO/ADDR1_SS), while IFS = High configures SPI (SCL_SCLK as SCLK, SDA_MOSI as MOSI, ADDR0_MISO as MISO, ADDR1_SS as SS). The pin functions are hardwired per mode; mixed-mode operation is not supported in LP5866TRKPR.

How does the LP5866TRKPR handle LED open/short detection?

The LP5866TRKPR provides per-dot open-circuit and short-circuit detection on all 18 current sink outputs (CS0–CS17). Detection status is reported via dedicated flag bits in the FAULT register, readable over I²C or SPI. No external sensing resistors or comparators are needed - the function is fully integrated. Fault detection operates during active drive and remains functional across all dimming modes, including analog and PWM.

What is the purpose of the VSYNC pin on the LP5866TRKPR?

The VSYNC pin on the LP5866TRKPR enables hardware-synchronized frame updates in Data Refresh Mode 2 (8-bit PWM) and Mode 3 (16-bit PWM). A high-level pulse on VSYNC triggers simultaneous latching and display of the entire SRAM frame, ensuring deterministic timing across multiple LP5866TRKPR devices. It is unused in Mode 1 (instant update) and has no function during I²C/SPI communication setup or configuration writes.

Can the LP5866TRKPR drive 100 mA LEDs at 2.7 V supply?

No. The LP5866TRKPR delivers 100 mA per current sink only when VCC ≥ 3.3 V. At VCC = 2.7 V, the maximum sink current is reduced - datasheet specifications do not guarantee 100 mA operation below 3.3 V. The device's UVLO threshold is ~2.5 V (rising), and saturation voltage (VSAT) increases significantly below 3.3 V, limiting usable current headroom. For 100 mA operation, maintain VCC ≥ 3.3 V and ensure adequate PCB copper for thermal dissipation in LP5866TRKPR.