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Texas Instruments LP5861TRSMR
- Part No.:
- LP5861TRSMR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
LP5861TRSMR.pdf
- Description:
- 18-CHANNEL HIGH-CURRENT RGB LED
- Quantity:
- Payment:
- Shipping:
Inventory:1,753
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Product details
Overview
LP5861TRSMR from Texas Instruments is an 18-channel high-current LED driver IC with integrated constant-current sinks, supporting both 8-bit analog dimming (via MC/CC/DC registers) and configurable 8-bit or 16-bit PWM dimming. It delivers up to 125 mA per channel at VCC ≥ 3.3 V, features ±5% device-to-device and channel-to-channel current matching, and operates across 2.7 V–5.5 V supply rails. It is used in RGB keyboard backlighting, smart appliance LED animation, and outdoor keypad illumination.
For engineers reviewing the LP5861TRSMR datasheet, LP5861TRSMR pinout, LP5861TRSMR application, or LP5861TRSMR equivalent, key selection considerations include its VQFN-32 (RSM) package, dual I²C/SPI interface (1 MHz / 12 MHz), 125 mA sink capability, phase-shifted PWM for transient power balancing, and full SRAM-based addressable control for low-data-traffic LED matrix updates.
Technical Context
The LP5861TRSMR integrates 18 precision constant-current sinks with programmable analog gain (3-bit MC, 7-bit CC per group, 8-bit DC per dot) and independent 8-/16-bit PWM generators clocked by a 32-MHz internal oscillator (±2% accuracy). Its architecture supports three-phase PWM timing shift to reduce input current ripple and suppress ceramic capacitor ringing.
It implements hardware-level open/short detection per channel, deghosting circuitry for bidirectional ghost cancellation, and low-brightness compensation per color group. Interface selection (I²C fast-mode+/SPI) is controlled by the IFS pin, and logic compatibility spans 1.8 V–5 V VIO levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC / VLED Range | 2.7 V to 5.5 V - supports single-supply operation across wide industrial and consumer voltage domains |
| Max Sink Current | 125 mA per channel at VCC ≥ 3.3 V - enables direct drive of high-brightness LEDs without external boost or switching stages |
| Current Matching | ±5% device-to-device and channel-to-channel error - ensures uniform brightness across multi-LED arrays without per-channel calibration |
| PWM Frequency | 62.5 kHz or 125 kHz - audible-noise-free operation above human hearing range, eliminating coil whine in compact designs |
| Interface Speed | I²C up to 1 MHz (fast-mode+), SPI up to 12 MHz - allows rapid frame updates for dynamic LED animations |
| Shutdown Current | ≤2 µA - enables ultra-low-power standby in battery-backed or energy-sensitive applications |
| Thermal Shutdown | 150 °C with 15 °C hysteresis - protects against sustained overtemperature in enclosed enclosures or high ambient conditions |
Pinout & Package
VQFN-32 (RSM) package, 4.00 mm × 4.00 mm body size with exposed thermal pad (GND-connected) for enhanced thermal dissipation in high-current LED driving.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Device power supply | Primary logic and core supply; requires local 1-μF decoupling to GND for stable operation |
| VLED | High-side LED supply | Independent rail for LED anodes; supports up to 5.5 V and separates LED current path from logic domain |
| VIO_EN | Digital I/O supply & chip enable | Supplies interface logic and enables device; accepts 1.65–5.5 V and requires 1-nF bypass |
| CS0–CS17 | Constant-current sink outputs | 18 dedicated open-drain outputs; each drives one LED cathode; floating if unused |
| IFS | Interface select | Low = I²C mode (SDA/SCL), High = SPI mode (MOSI/MISO/SCLK/SS); resistor-pulled to VIO |
| SCL_SCLK / SDA_MOSI / ADDR0_MISO / ADDR1_SS | Configurable serial interface pins | Multi-function pins adapt to selected protocol; require appropriate pull-ups (I²C) or routing (SPI) |
| VSYNC | External synchronization input | Aligns display update timing across multiple LP5861TRSMR devices in tiled LED systems |
| VCAP | Internal LDO output | Stabilized internal voltage rail; requires 1-μF capacitor to GND for regulation integrity |
Key Features
| Feature | Design Value |
|---|---|
| Full addressable SRAM | Enables partial or full frame refresh with minimal data traffic-critical for real-time LED animation on resource-constrained MCUs |
| Three-phase PWM timing shift | Reduces peak input current by staggering 18-channel turn-on events, lowering required bulk capacitance and EMI filtering |
| Per-group low-brightness compensation | Corrects color shift and non-uniformity in sub-10% duty cycles across red/green/blue LED groups independently |
| Hardware LED open/short detection | Automatically identifies failed LEDs during operation without MCU intervention-supports fail-safe UI feedback |
| Gamma-correctable dimming scale | Configurable exponential or linear PWM scaling per register, enabling human-eye-optimized brightness curves out-of-box |
Applications
| RGB Keyboard Backlighting | Smart Appliance LED Animation |
|---|---|
Use Scenario: Dynamic per-key illumination with smooth color transitions and responsive user feedback in mechanical keyboards. IC Role / Device Role / Timing Role: LP5861TRSMR acts as the primary LED matrix controller, managing 18 individually addressable keys or 6 RGB zones via SRAM-mapped PWM registers. Use Value: 16-bit PWM depth eliminates visible stepping in subtle dimming, while phase-shifted drive prevents audible noise from ceramic capacitors during rapid lighting changes. |
Use Scenario: Status indicators and animated UI elements on refrigerator control panels, washing machine displays, and oven interfaces. IC Role / Device Role / Timing Role: LP5861TRSMR serves as the embedded LED driver, receiving commands over I²C from host MCU to render icons, progress bars, or warning sequences. Use Value: ±5% current matching ensures consistent color balance across multi-color segments; shutdown current ≤2 µA supports always-on standby compliance. |
| Outdoor Keypad Illumination | IR Module Indicator for IP Cameras |
Use Scenario: Weather-resistant keypad backlighting requiring high brightness, thermal resilience, and long-term reliability under UV exposure. IC Role / Device Role / Timing Role: LP5861TRSMR drives 18 high-intensity LEDs directly, leveraging its 125 mA sink capability and –40°C to +85°C operating range. Use Value: VLED/VCC rail independence allows optimized LED forward voltage headroom; thermal shutdown (150 °C) prevents latch-up in sun-heated enclosures. |
Use Scenario: Status and activity indication for infrared illuminators in security cameras-visible only to IR sensors, not humans. IC Role / Device Role / Timing Role: LP5861TRSMR controls discrete IR LED dots synchronized to camera frame rate via VSYNC input. Use Value: Hardware VSYNC alignment ensures flicker-free indicator behavior during video capture; open/short detection flags LED failure before field service is needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5861RSMR | Lower max sink current (50 mA vs. 125 mA); identical RSM package and pinout | Targeted at low-power indicator LEDs, not high-brightness backlighting | Select LP5861RSMR only when LED forward current requirements are ≤50 mA and thermal budget is constrained |
| LP5862RSMR | 36-channel variant (2× LP5861TRSMR density); same 125 mA/channel rating and RSM package | Used where higher LED count per board area is required without increasing IC count | Choose LP5862RSMR for space-constrained designs needing >18 channels; verify PCB layout supports doubled pin density |
Compared with LP5861RSMR and LP5862RSMR, the LP5861TRSMR uniquely balances 125 mA per-channel drive strength, 18-channel granularity, and VQFN-32 footprint-making it optimal for mid-density RGB UIs where per-channel control fidelity and thermal headroom are prioritized over channel count or ultra-low power.
Availability
LP5861TRSMR is available at Aetrix Electronics and suitable for RGB keyboard backlighting, smart appliance UIs, and outdoor keypad illumination requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LP5861TRSMR 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 decades of expertise in high-reliability LED driver design.
The LP5861TRSMR belongs to TI's LP58xx family of high-current, addressable LED drivers engineered specifically for vivid, flicker-free, and acoustically silent LED animation in consumer and industrial human-machine interfaces.
FAQ
What is the maximum LED current supported by the LP5861TRSMR?
The LP5861TRSMR supports up to 125 mA per current sink when VCC ≥ 3.3 V. This rating is confirmed in the Electrical Characteristics table under "ICS Constant current sink output range" and applies specifically to the LP5861TRSMR variant-not the LP5861RSMR (50 mA) or extended-temp LP5861TMRSMR (100 mA). The 125 mA capability enables direct drive of high-luminance LEDs without external current amplification stages.
Does the LP5861TRSMR support both I²C and SPI interfaces simultaneously?
No-the LP5861TRSMR supports either I²C or SPI, selected by the logic level on the IFS pin: IFS = Low configures SDA/SCL/ADDR0/ADDR1 for I²C (up to 1 MHz), while IFS = High configures SDA_MOSI/SCL_SCLK/ADDR0_MISO/ADDR1_SS for SPI (up to 12 MHz). Both protocols share physical pins but operate exclusively; simultaneous use is not supported.
How does the LP5861TRSMR handle thermal management in high-current operation?
The LP5861TRSMR incorporates thermal shutdown at 150 °C (with 15 °C hysteresis) and is packaged in a thermally enhanced VQFN-32 (RSM) with an exposed GND pad. Its RθJB of 12.3 °C/W enables effective heat transfer to the PCB. For continuous 125 mA operation across all 18 channels, proper copper pour, thermal vias under the pad, and airflow must be implemented per TI's layout guidelines in Section 9.4 of the datasheet.
Can the LP5861TRSMR drive RGB LEDs directly, and how are channels mapped?
Yes-the LP5861TRSMR directly drives 6 RGB LEDs (18 total channels), with fixed group mapping: Group 1 (red) = CS0/CS3/CS6/CS9/CS12/CS15; Group 2 (green) = CS1/CS4/CS7/CS10/CS13/CS16; Group 3 (blue) = CS2/CS5/CS8/CS11/CS14/CS17. Each group has independent 7-bit Color Current (CC) control, enabling precise white-point tuning and color balance correction.
What dimming resolution does the LP5861TRSMR provide, and how is it achieved?
The LP5861TRSMR provides true 16-bit PWM dimming resolution per channel using its enhanced spectrum PWM (ES-PWM) algorithm-achieving >65,000 steps without sacrificing refresh rate. This is combined with 8-bit analog dot correction (DC), 7-bit per-group color current (CC), and 3-bit global maximum current (MC), enabling >24-bit effective dimming control depth for artifact-free LED animation in the LP5861TRSMR.
LP5861TRSMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-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:
- 2.7V ~ 5.5V
- Current - Output / Channel:
- 125mA
- Frequency:
- 31.2MHz
- Dimming:
- Analog, I2C, PWM, SPI
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (4x4)
LP5861TRSMR FAQ
1.How can I place an order for LP5861TRSMR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5861TRSMR 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 LP5861TRSMR reliable?
The price and inventory of LP5861TRSMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5861TRSMR is usually 5 days.
3.What payment methods are accepted for LP5861TRSMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5861TRSMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5861TRSMR?
LP5861TRSMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5861TRSMR 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 LP5861TRSMR?
For technical support, including LP5861TRSMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5861TRSMR requirements.
6.How does Aetrix verify that LP5861TRSMR is sourced from the original manufacturer or authorized distributors?
All LP5861TRSMR 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 LP5861TRSMR meets industry standards.
7.What is the process for return or replacement of LP5861TRSMR?
All LP5861TRSMR units undergo pre-shipment inspection (PSI). If there is an issue with LP5861TRSMR, 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 LP5861TRSMR part is unused and in its original packaging.
Return procedure for LP5861TRSMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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