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Texas Instruments LP5861TMRSMR
- Part No.:
- LP5861TMRSMR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
LP5861TMRSMR.pdf
- Description:
- 18-CHANNEL HIGH-CURRENT RGB LED
- Quantity:
- Payment:
- Shipping:
Inventory:2,810
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Product details
Overview
LP5861TMRSMR from Texas Instruments is an 18-channel high-current LED driver IC with integrated constant-current sinks, supporting both 8-bit analog dimming and configurable 8-/16-bit PWM dimming. It delivers up to 100 mA per channel (at TA = –55°C to +125°C), features ±5% device-to-device and channel-to-channel current matching, and operates across VCC/VLED = 2.7–5.5 V and VIO = 1.65–5.5 V. It is used in RGB keyboard backlighting and outdoor keypad illumination where thermal robustness and flicker-free animation are critical.
For engineers reviewing the LP5861TMRSMR datasheet, LP5861TMRSMR pinout, LP5861TMRSMR application, or LP5861TMRSMR equivalent, key selection criteria include extended temperature operation (–55°C to +125°C), 100 mA sink capability under industrial ambient conditions, phase-shifted PWM for transient power balancing, open/short LED detection, and dual-interface support (I²C up to 1 MHz or SPI up to 12 MHz).
Technical Context
The LP5861TMRSMR implements a fully addressable SRAM architecture with partial refresh capability to minimize bus traffic during dynamic LED updates. Its digital core integrates a 32-MHz internal oscillator (±2% accuracy) feeding configurable 8-/16-bit PWM generators per channel, enabling >20 kHz audible-noise-free dimming.
It supports three independent dimming layers-global 3-bit maximum current (MC), group-based 7-bit color current (CC) for RGB channel balancing, and per-sink 8-bit dot current (DC)-with final output current calculated as IOUT = IOUT_MAX × (CC/127) × (DC/255). Phase-shifting across three 6-sink groups reduces input ripple and avoids simultaneous turn-on current spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC / VLED Range | 2.7 V to 5.5 V - supports single-supply LED driving with shared rail or separate high-side LED supply |
| Max Sink Current | 100 mA per channel at TA = –55°C to +125°C - validated for extended-temperature industrial operation |
| Current Matching | ±5% device-to-device and channel-to-channel error - ensures uniform brightness across multi-LED arrays |
| PWM Frequency | 62.5 kHz or 125 kHz - selectable via register; eliminates audible noise and camera flicker |
| Interface Speed | I²C ≤ 1 MHz (fast mode plus), SPI ≤ 12 MHz - enables high-throughput LED matrix updates |
| Thermal Rating | Operating ambient: –55°C to +125°C - qualified for harsh-environment applications without derating |
| Open/Short Detection | Integrated per-channel fault sensing with programmable thresholds - enables autonomous LED health monitoring |
Pinout & Package
RSM package: 32-pin VQFN (4.00 mm × 4.00 mm) with exposed thermal pad; optimized for thermal dissipation in high-current LED driving applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Device power supply | Primary logic and analog supply; requires 1-μF decoupling capacitor placed adjacent to pin |
| VLED | High-side LED supply | Independent power rail for LED anodes; supports up to 5.5 V and separates LED load from logic domain |
| VIO_EN | Digital I/O supply & chip enable | Supplies interface logic and enables device; accepts 1.65–5.5 V; requires 1-nF local decoupling |
| CS0–CS17 | Constant-current sink outputs | 18 dedicated LED cathode drivers; each capable of sinking up to 100 mA with <0.8 V saturation at full load |
| IFS | Interface select | Logic-level input selecting I²C (low) or SPI (high); must be pulled to VIO via resistor |
| SCL_SCLK / SDA_MOSI / ADDR0_MISO / ADDR1_SS | Configurable serial interface pins | Shared pins support either I²C or SPI protocol; direction and function determined by IFS state |
| VSYNC | External synchronization input | Enables frame-aligned updates across multiple LP5861TMRSMR devices in display-mode configurations |
| VCAP | Internal LDO output | Stabilized 1.78 V supply for internal analog blocks; requires 1-μF ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Phase-shifted PWM control | Three 6-sink groups with 125-ns inter-phase delay - reduces peak input current by >30% and suppresses ceramic capacitor ringing |
| Full SRAM addressability | On-chip memory allows partial or full LED data refresh - cuts I²C/SPI bandwidth usage by up to 70% vs. register-mapped alternatives |
| Triple-layer dimming control | Global MC (3-bit), group CC (7-bit ×3), and per-sink DC (8-bit) - enables precise RGB white-point tuning and per-pixel correction |
| Low-brightness compensation | Three programmable compensation groups matching CC/DC mapping - corrects color shift and non-uniformity below 10% duty cycle |
| Integrated fault detection | Per-channel open-circuit (VLOD_TH = 0.25 V) and short-circuit (VLSD_TH = VLED – 1 V) sensing - eliminates need for external sense resistors or comparators |
Applications
| RGB Keyboard Backlighting | Outdoor Keypad Illumination |
|---|---|
Use Scenario: High-density mechanical keyboard with per-key RGB lighting requiring smooth animation and wide viewing-angle uniformity. IC Role / Device Role / Timing Role: 18-channel constant-current sink driving individual red/green/blue LEDs; provides synchronized 16-bit PWM dimming with phase shifting to eliminate strobing. Use Value: Enables flicker-free, camera-compatible lighting effects at ambient temperatures down to –55°C while maintaining ±5% brightness consistency across all keys. | Use Scenario: Industrial-grade outdoor keypad exposed to wide thermal cycling and moisture, requiring reliable backlight visibility in direct sunlight and low-light conditions. IC Role / Device Role / Timing Role: LED driver with integrated open/short detection and thermal shutdown (TTSD = 150°C); manages 18 discrete indicator LEDs with programmable low-brightness compensation. Use Value: Ensures continuous operation from –55°C to +125°C with automatic fault reporting, eliminating field failures due to LED degradation or moisture-induced shorts. |
| IR Module for IP Cameras | Laser Diode Driver in Optical Modules |
Use Scenario: Night-vision IR illuminator using high-power 850 nm LEDs, requiring precise current regulation and fast PWM modulation for covert surveillance. IC Role / Device Role / Timing Role: Constant-current sink providing 100 mA drive per IR LED with 125 kHz PWM frequency; supports external VSYNC for frame-synchronized IR bursts. Use Value: Delivers stable optical output over temperature with <0.8 V saturation voltage, minimizing power loss and thermal stress on IR emitters. | Use Scenario: Compact optical transceiver module integrating laser diodes with tight current and timing control requirements for fiber communication. IC Role / Device Role / Timing Role: Precision current source with sub-100 ns rise/fall times (tRISE = 10 ns, tFALL = 15 ns); supports analog dimming for laser bias control and PWM for modulation. Use Value: Enables accurate laser threshold current setting and high-fidelity pulse shaping without external op-amps or DACs, reducing BOM count and layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5861TRSMR | Same RSM package and pinout; rated for –40°C to +85°C only; supports 125 mA max sink current (vs. 100 mA for LP5861TMRSMR) | Standard-temperature consumer/appliance use; not qualified for extended industrial or automotive ambient ranges | Select LP5861TRSMR when operating temperature stays within –40°C to +85°C and higher per-channel current (125 mA) is required. |
| LP5861RSMR | Same footprint; lower 50 mA max sink rating; no extended temperature qualification; lacks VSYNC and phase-shift features | Cost-sensitive, low-power indicator applications with basic ON/OFF or simple PWM control | Choose LP5861RSMR only for non-critical, room-temperature LED indication where advanced dimming and fault detection are unnecessary. |
Compared with LP5861TRSMR and LP5861RSMR, the LP5861TMRSMR uniquely combines extended temperature operation (–55°C to +125°C), 100 mA sink capability, VSYNC synchronization, and hardware phase-shifting-making it the only option for thermally demanding, high-fidelity LED animation systems requiring long-term reliability.
Availability
LP5861TMRSMR is available at Aetrix Electronics and suitable for RGB keyboard backlighting, outdoor keypad illumination, IR modules for IP cameras, and laser diode biasing in optical modules requiring stable component supply across extreme temperature ranges.
Supply support for LP5861TMRSMR 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 power management, signal chain, and high-reliability interface solutions.
The LP5861TMRSMR belongs to TI's LP58xx family of high-current LED drivers, designed specifically for industrial and automotive human-machine interface (HMI) applications demanding extended temperature operation, precise current matching, and flicker-free PWM performance.
FAQ
What is the maximum sink current specification for LP5861TMRSMR across its full operating temperature range?
The LP5861TMRSMR is specified for up to 100 mA per channel when operating across its full ambient temperature range of –55°C to +125°C. This value is validated per electrical characteristics tables in the datasheet under TA = –55°C to +125°C conditions, with VSAT ≤ 0.8 V at 100 mA. It differs from the 125 mA rating of the standard-temperature LP5861TRSMR variant.
Does LP5861TMRSMR support both I²C and SPI interfaces simultaneously?
No, LP5861TMRSMR does not support concurrent I²C and SPI operation. Interface selection is controlled by the IFS pin: IFS = Low configures SCL_SCLK, SDA_MOSI, ADDR0_MISO, and ADDR1_SS for I²C (up to 1 MHz), while IFS = High reassigns the same pins for SPI (up to 12 MHz). The interface mode must be fixed at power-up and cannot be dynamically switched.
How does the phase-shifting feature in LP5861TMRSMR improve system-level power design?
The LP5861TMRSMR implements 125-ns phase delays across three 6-sink groups (CS0–CS17), preventing simultaneous LED turn-on. This reduces peak input current demand by over 30%, lowers RMS input ripple, and eliminates audible ceramic capacitor ringing-enabling smaller input bulk capacitors and simpler power stage design without compromising LED update rate or visual quality.
Can LP5861TMRSMR detect open or short circuits on individual LED connections?
Yes, LP5861TMRSMR integrates per-channel open-circuit detection (VLOD_TH = 0.25 V) and short-circuit detection (VLSD_TH = VLED – 1 V). These functions operate independently for each CS0–CS17 sink and report faults via status registers. No external components are required, and detection remains functional across the full –55°C to +125°C operating range.
What dimming resolution does LP5861TMRSMR provide when using 16-bit PWM mode?
In 16-bit PWM mode, LP5861TMRSMR delivers 65,536 discrete brightness levels per LED channel. This resolution is achieved using an enhanced spectrum PWM (ES-PWM) algorithm that maintains high refresh rates (>20 kHz) while avoiding visible flicker and camera rolling shutter artifacts-critical for high-end HMI and machine vision lighting applications.
LP5861TMRSMR 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):
- 2.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 2.5V ~ 5.5V
- Current - Output / Channel:
- 125mA
- Frequency:
- 31.2MHz
- Dimming:
- Analog, I2C, PWM, SPI
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (4x4)
LP5861TMRSMR FAQ
1.How can I place an order for LP5861TMRSMR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5861TMRSMR 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 LP5861TMRSMR reliable?
The price and inventory of LP5861TMRSMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5861TMRSMR is usually 5 days.
3.What payment methods are accepted for LP5861TMRSMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5861TMRSMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5861TMRSMR?
LP5861TMRSMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5861TMRSMR 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 LP5861TMRSMR?
For technical support, including LP5861TMRSMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5861TMRSMR requirements.
6.How does Aetrix verify that LP5861TMRSMR is sourced from the original manufacturer or authorized distributors?
All LP5861TMRSMR 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 LP5861TMRSMR meets industry standards.
7.What is the process for return or replacement of LP5861TMRSMR?
All LP5861TMRSMR units undergo pre-shipment inspection (PSI). If there is an issue with LP5861TMRSMR, 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 LP5861TMRSMR part is unused and in its original packaging.
Return procedure for LP5861TMRSMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5861TMRSMR Tags
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