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Texas Instruments LP5866DBTR
- Part No.:
- LP5866DBTR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
LP5866DBTR.pdf
- Description:
- 6 18 LED MATRIX DRIVER WITH 8-B
- Quantity:
- Payment:
- Shipping:
Inventory:3,302
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Product details
Overview
LP5866DBTR from Texas Instruments is a 6 × 18 LED matrix driver IC with 18 precision constant-current sinks and 6 high-side PMOS scan switches, supporting up to 108 individually addressable LED dots or 36 RGB pixels. It delivers 0.1–50 mA per sink (VCC ≥ 3.3 V), ±3% device-to-device and channel-to-channel current accuracy at 50 mA, and supports both 8-bit analog dimming and 8-/16-bit audible-noise-free PWM dimming for gaming peripherals and smart audio devices.
For engineers reviewing the LP5866DBTR datasheet, LP5866DBTR pinout, LP5866DBTR application, or LP5866DBTR equivalent, this page provides verified technical context on time-multiplexed matrix control, SRAM-based data refresh, deghosting circuitry, and dual I²C/SPI interface selection - all critical for low-latency LED animation in resource-constrained embedded systems.
Technical Context
The LP5866DBTR implements a time-multiplexed 6-line × 18-sink architecture with programmable scan line count (1–6), phase-shifted PWM timing (125 kHz or 62.5 kHz), and integrated upside/downside deghosting via pre-charge and discharge control. Its full addressable SRAM minimizes bus traffic during partial frame updates.
It integrates dual-dimension dimming: global 3-bit maximum current (MC), 3-group 7-bit color current (CC), and individual 8-bit dot current (DC) for analog control - plus per-dot 8-/16-bit PWM with arbitrary group mapping. The 32 MHz internal oscillator enables precise timing without external crystals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC / VLED Range | 2.7 V to 5.5 V - supports single-supply operation across logic and LED rails, eliminating need for separate bias supplies. |
| Constant Current Sink Range | 0.1 mA to 50 mA (VCC ≥ 3.3 V) - enables direct drive of low-current indicators or high-brightness LEDs without external current-setting resistors. |
| Current Accuracy | ±3% device-to-device and channel-to-channel error at 50 mA - ensures uniform brightness across 108 LED dots without per-channel calibration. |
| PWM Frequency Options | 62.5 kHz or 125 kHz - eliminates audible noise in speaker front panels and gaming accessories while maintaining smooth grayscale transitions. |
| Interface Speed | 12 MHz SPI or 1 MHz I²C - allows high-throughput frame updates for real-time animations or low-pin-count integration in space-constrained designs. |
| Supply Current (Active) | 4.3 mA typical at 5 mA/channel - enables efficient operation in always-on UI lighting applications with minimal thermal impact. |
| Open/Short Detection | Integrated per-sink fault detection with 0.25 V open threshold and VLED − 1 V short threshold - simplifies system-level LED health monitoring without external sense circuitry. |
Pinout & Package
TSSOP-38 package (9.70 mm × 4.40 mm) with exposed thermal pad; pin-compatible with LP5866 family variants in same footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS0–CS17 | Constant-current sink outputs | 18 independent LED cathode drivers; each sinks up to 50 mA with ±3% matching - forms 108-dot matrix with 6 scan lines. |
| SW0–SW5 | High-side PMOS scan switches | 6 anode-select MOSFETs with 310–450 mΩ RDS(on); enable time-multiplexed row scanning without external high-voltage drivers. |
| VLED | LED supply input | Direct connection to LED anode rail (2.7–5.5 V); decoupled via 1 µF capacitor - powers scan switches independently from logic supply. |
| VIO_EN | Digital core power & chip enable | 1.65–5.5 V logic supply with 1 nF bypass; asserts CHIP_EN bit to enter active mode - controls standby current (≤10 µA). |
| IFS | Interface select | Logic-level input: Low = I²C (1 MHz max), High = SPI (12 MHz max) - enables flexible host MCU interface choice without hardware redesign. |
| SCL_SCLK / SDA_MOSI / ADDR0_MISO / ADDR1_SS | Dual-mode serial interface pins | Shared I²C/SPI signals with pull-up/pull-down flexibility - reduces PCB routing complexity versus dedicated protocol interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| Full addressable SRAM | Enables partial frame updates and minimized I/O traffic - critical for low-bandwidth microcontrollers driving dynamic LED patterns. |
| Programmable deghosting | Configurable upside (scan-line discharge) and downside (current-sink pre-charge) cancellation - eliminates ghosting artifacts in high-density matrices without external components. |
| Low-brightness compensation | Three independent 7-bit groups (CS0/3/6/9/12/15, etc.) correct color shift and non-uniformity below 10% duty cycle - maintains RGB balance at dimmed levels. |
| Individual 8-/16-bit PWM per dot | Supports both fine-grained (256-step) and ultra-smooth (65,536-step) dimming - eliminates visible stepping in ambient lighting and audio-reactive visualizations. |
| Integrated open/short detection | Per-sink fault reporting via register flags - enables automatic LED failure logging in smart home appliances and server status panels. |
Applications
| Gaming Peripheral UI | Smart Speaker Front Panel |
|---|---|
Use Scenario: RGB backlighting for mechanical keyboards and programmable mice with real-time game-state feedback. IC Role / Device Role / Timing Role: LED matrix driver managing 108 individually animated dots via time-multiplexed scanning and SRAM-based frame buffering. Use Value: Enables flicker-free, high-refresh-rate animations using only 6 GPIOs and one SPI/I²C bus - reducing MCU pin count and firmware overhead. |
Use Scenario: Multi-color status ring and volume indicator on voice-controlled speakers with ambient light adaptation. IC Role / Device Role / Timing Role: Constant-current sink controller delivering calibrated RGB output with low-brightness compensation for night-mode visibility. Use Value: Maintains color fidelity and uniformity across 36 RGB pixels at 1–5% brightness - eliminating blue-wash and green-shift common in uncorrected LED arrays. |
| Audio Mixer Channel Meters | Network Equipment Status Display |
Use Scenario: Real-time VU metering and clip indication on professional DJ mixers and broadcast consoles. IC Role / Device Role / Timing Role: High-speed PWM-driven LED driver synchronizing to audio envelope detection with <100 µs response latency. Use Value: Achieves >20 kHz PWM frequency to prevent audible coil whine while delivering 125 kHz update rate for accurate peak capture. |
Use Scenario: Port-status, link-activity, and error-indication LEDs on enterprise switches and routers with hot-swap support. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with integrated open/short detection and thermal shutdown (150 °C). Use Value: Reduces BOM count by eliminating discrete current-limiting resistors and external fault-monitoring ICs - improving board-level reliability. |
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 | VQFN-40 package (5.00 mm × 5.00 mm); identical electrical specs and register map - differs only in thermal pad layout and pinout. | Preferred for high-density PCBs requiring lower thermal resistance (RθJA = 31.4 °C/W vs. 67.0 °C/W for TSSOP). | Select LP5866RKPR when thermal performance or automated optical inspection (AOI) compatibility is prioritized over through-hole assembly. |
| LP5864DBTR | Supports only 4 scan lines (72 LED dots); shares same TSSOP-38 package, I²C/SPI interface, and SRAM architecture - but lacks SW4/SW5 pins and related control registers. | Suitable for smaller displays (e.g., 4×18 keyboard zones) where full 108-dot capability is unnecessary. | Choose LP5864DBTR to reduce cost and simplify firmware when driving ≤72 LEDs and no future scalability is required. |
Compared with LP5866RKPR, the LP5866DBTR trades thermal efficiency for easier manual soldering and legacy TSSOP footprint compatibility; versus LP5864DBTR, it adds two scan lines and associated control logic - enabling larger matrices without increasing interface bandwidth or MCU load.
Availability
LP5866DBTR is available at Aetrix Electronics and suitable for gaming peripherals, smart speaker front panels, audio mixer meters, network equipment status displays, and LED animation subsystems requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for LP5866DBTR 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 power management solutions for industrial, automotive, and consumer markets.
The LP5866 belongs to TI's high-performance LED matrix driver product line, designed specifically for flicker-free, low-noise, and thermally efficient LED animation in space-constrained human-interface applications.
FAQ
What is the maximum number of LEDs the LP5866DBTR can drive?
The LP5866DBTR drives up to 108 individual LED dots (6 scan lines × 18 constant-current sinks) or 36 RGB pixels using time-multiplexed matrix scanning. Each CS0–CS17 sink supports 0.1–50 mA, and SW0–SW5 provide high-side switching - enabling full control of large LED arrays with minimal MCU resources. This capability is fixed for the LP5866DBTR and confirmed in TI's SNVSC36A datasheet Section 7.1.
Does the LP5866DBTR support both I²C and SPI interfaces simultaneously?
No - the LP5866DBTR uses a single shared serial interface that operates in either I²C or SPI mode, selected by the logic level on the IFS pin: Low enables I²C (up to 1 MHz), High enables SPI (up to 12 MHz). Pins SCL_SCLK, SDA_MOSI, ADDR0_MISO, and ADDR1_SS serve dual roles depending on IFS state. This configuration is documented in Table 5-1 and Section 7.3.3 of the LP5866DBTR datasheet.
How does the LP5866DBTR handle LED open-circuit and short-circuit faults?
The LP5866DBTR integrates per-sink open/short detection: open-circuit threshold is 0.25 V, short-circuit threshold is VLED − 1 V. Detection results are reported in dedicated status registers (OPEN_FLAG and SHORT_FLAG), allowing firmware to identify failed LEDs without external sensing circuitry. This feature is specified in Section 6.5 and Figure 7-10 of the LP5866DBTR datasheet.
What is the purpose of the VCAP pin on the LP5866DBTR?
The VCAP pin is the output of the internal LDO regulator, providing a stable ~1.78 V supply for internal analog circuitry. A 1 µF ceramic capacitor must be placed between VCAP and GND, located as close to the pin as possible. This decoupling is mandatory for proper operation of current sinks and PWM generators - omission causes instability and inaccurate dimming, as detailed in Section 5 and Figure 8-1 of the LP5866DBTR datasheet.
Can the LP5866DBTR drive RGB LEDs with independent color control?
Yes - the LP5866DBTR supports independent red, green, and blue control via three 7-bit Color Current (CC) registers, each assigned to a specific group of current sinks (e.g., CC1 for CS0/CS3/CS6…). Combined with individual 8-bit Dot Current (DC) and 8-/16-bit PWM settings, this enables full per-pixel RGB mixing and gamma correction. This capability is explicitly described in Section 7.3.2 and Table 7-2 of the LP5866DBTR datasheet.
LP5866DBTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- 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:
- 2.7V ~ 5.5V
- Current - Output / Channel:
- 50mA
- Frequency:
- 1MHz, 12MHz
- Dimming:
- Analog, PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP
LP5866DBTR FAQ
1.How can I place an order for LP5866DBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5866DBTR 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 LP5866DBTR reliable?
The price and inventory of LP5866DBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5866DBTR is usually 5 days.
3.What payment methods are accepted for LP5866DBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5866DBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5866DBTR?
LP5866DBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5866DBTR 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 LP5866DBTR?
For technical support, including LP5866DBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5866DBTR requirements.
6.How does Aetrix verify that LP5866DBTR is sourced from the original manufacturer or authorized distributors?
All LP5866DBTR 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 LP5866DBTR meets industry standards.
7.What is the process for return or replacement of LP5866DBTR?
All LP5866DBTR units undergo pre-shipment inspection (PSI). If there is an issue with LP5866DBTR, 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 LP5866DBTR part is unused and in its original packaging.
Return procedure for LP5866DBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5866DBTR Tags
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BCR420UE6433HTMA1
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BCR421UE6327HTSA1
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
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