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Texas Instruments LP55281RLX/NOPB
- Part No.:
- LP55281RLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 36-WFBGA, DSBGA
- Datasheet:
-
LP55281RLX/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 36DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,990
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Product details
Overview
LP55281RLX/NOPB from Texas Instruments is a 12-channel RGB/white LED driver IC with integrated magnetic boost DC-DC converter, SPI/I²C interface, and audio-synchronized ALED output. It delivers up to 40 mA per channel across four RGB LED sets (R1–R4, G1–G4, B1–B4), supports 4–5.3 V boost output, and enables real-time LED response to stereo audio inputs via ASE1/ASE2 pins. Designed for compact handheld devices, it drives LEDs directly from boost output or external supply.
For engineers reviewing the LP55281RLX/NOPB datasheet, LP55281RLX/NOPB pinout, LP55281RLX/NOPB application, or LP55281RLX/NOPB equivalent, key selection criteria include its 36-pin DSBGA package, 2 MHz boost switching frequency (RT = 82 kΩ), 6-bit per-channel PWM resolution, audio sync gain programmability, and built-in LED connectivity test via serial interface.
Technical Context
The LP55281RLX/NOPB integrates a current-programmed mode (CPM) magnetic boost converter with overvoltage, overcurrent, feedback-break, and duty-cycle protection. Its 8-bit BOOST OUTPUT register selects one of nine output voltages (4.0–5.3 V in 0.15 V steps), while FRQ_SEL[2:0] configures switching frequency at 1/1.67/2 MHz.
Each RGB channel uses a current sink architecture with external RRGB resistor (typ. 8.2 kΩ) setting full-scale current (IMAX ≈ 150 mA), and 2-bit coarse + 6-bit fine PWM control enabling 64-step intensity resolution per color. Audio synchronization employs dual analog inputs (ASE1/ASE2), 10–15 kΩ input impedance, 0–1600 mVpp dynamic range, and digital AGC/peak detection to drive ALED with programmable hold time and refresh frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 12 independent outputs: 4×RGB (R1–R4, G1–G4, B1–B4) + 1×ALED |
| Boost Output Voltage | Programmable 4.0–5.3 V in 9 steps; set by 8-bit register (00h = 4.0 V, FFh = 5.3 V) |
| Max Sink Current per RGB Pin | 40 mA (limited by RRGB = 8.2 kΩ; IMAX = 1.23 V / RRGB) |
| PWM Resolution & Frequency | 6-bit (64-step) per channel; selectable 9.92/19.84/39.68 kHz |
| Audio Sync Inputs | Two single-ended analog inputs (ASE1, ASE2); 0–1600 mVpp, 10–15 kΩ input impedance |
| Interface Modes | SPI (up to 13 MHz @ VDDIO > 1.8 V) or I²C (400 kHz standard mode) |
| Package | 36-pin DSBGA (YPG/YZR), 2.982 mm × 2.982 mm, 0.4 mm pitch |
Pinout & Package
LP55281RLX/NOPB uses a 36-pin DSBGA (DSBGA-36, YPG/YZR) package with 0.4 mm ball pitch and 2.982 mm × 2.982 mm body size. The bottom-side layout includes dedicated ground balls (GND, GNDA, GND_RGB1, GND_RGB2, GND_SW) and power distribution optimized for low-noise LED driving and boost converter stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, VDD2, VDDIO, VDDA | Power supply inputs | VDD1/VDD2: main logic supplies (2.7–5.5 V); VDDIO: I/O buffer supply (1.65–VDD1); VDDA: internal LDO output (2.8 V ±3%) for analog blocks |
| R1–R4, G1–G4, B1–B4 | Current sink outputs | 12 individually controllable LED sink channels; each driven by internal current mirror referenced to IRGB pin |
| ALED | Audio-sync LED output | Dedicated current sink output synchronized to peak amplitude of ASE1/ASE2 inputs; programmable brightness and hold time |
| ASE1, ASE2 | Analog audio inputs | Single-ended stereo inputs (0–1600 mVpp); internally mixed and processed for ALED modulation |
| SW, FB | Boost converter interface | SW: internal N-MOSFET switch node; FB: voltage feedback input for boost regulation (resistor divider sets output) |
| SCK/SCL, SI/A0, SS/SDA, SO | Serial interface pins | Configurable for SPI (SCK/SI/SS/SO) or I²C (SCL/SDA/A0); IF_SEL selects mode; NRST enables hardware reset |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Converter | Efficient 4–5.3 V output from 3–4.5 V Li-ion battery; 2 MHz default switching (RT = 82 kΩ); active load prevents pulse skipping at light loads |
| Per-Channel LED Control | Independent 6-bit PWM + 2-bit coarse current scaling per RGB channel; minimizes instantaneous current spikes via staggered PWM timing |
| Audio Synchronization Engine | Digital AGC, peak detection, and DC removal (–3 dB @ 500 Hz) enable responsive ALED lighting tied to audio envelope without MCU intervention |
| Production-Ready Diagnostics | Built-in LED connectivity test via serial interface verifies open/short faults on all 12 RGB outputs during manufacturing |
| Flexible Interface Selection | Hardware-selectable SPI or I²C (IF_SEL pin); dual I²C addresses support multi-device configurations on shared bus |
Applications
| Smartphone Status Lighting | Wearable Fitness Feedback |
|---|---|
|
Use Scenario: Dynamic notification lighting on smartphone bezels using RGB LEDs adjacent to display. IC Role / Device Role / Timing Role: LP55281RLX/NOPB drives 4 RGB LED sets with synchronized PWM and manages boost supply independently of system rail. Use Value: Enables smooth color transitions and low-power always-on status indicators without burdening application processor. |
Use Scenario: Real-time heart-rate or activity feedback via pulsing RGB LEDs on smartwatch band or housing. IC Role / Device Role / Timing Role: LP55281RLX/NOPB receives sensor data via MCU and renders intensity-modulated light patterns using precise 6-bit PWM timing. Use Value: Delivers consistent brightness across temperature and battery voltage with <±5% current matching between R/G/B channels. |
| Portable Media Player Visualizer | AR/VR Headset Ambient Lighting |
|
Use Scenario: Music-responsive LED strips on MP3 player casing that pulse in time with bass and treble frequencies. IC Role / Device Role / Timing Role: LP55281RLX/NOPB processes stereo audio inputs (ASE1/ASE2) and drives ALED + RGB channels with programmable hold speed and threshold. Use Value: Eliminates need for external ADC or DSP; achieves sub-20 ms audio-to-light latency using on-chip digital signal path. |
Use Scenario: Peripheral ambient lighting around AR glasses lenses that adapts hue/intensity based on UI state or environment. IC Role / Device Role / Timing Role: LP55281RLX/NOPB operates as autonomous lighting controller, accepting commands over I²C and regulating 12-channel output from single-cell battery. Use Value: Reduces BOM count by integrating boost, RGB drivers, and audio sync-critical for space-constrained wearable form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGB LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP55231RLX/NOPB | 9-channel (3×RGB) driver; no ALED or audio sync; 1.2 MHz boost; smaller 25-ball DSBGA | Lacks audio synchronization and fourth RGB set; suited for simpler status lighting only | Select when audio sync and 12-channel capability are unnecessary and board area is constrained |
| LP5562RSBT | 12-channel with enhanced audio engine (FFT-based analysis), higher 60 mA/channel, QFN-32 package | Supports spectral lighting effects (e.g., frequency bands); requires more PCB area and external components | Choose for advanced visualizers requiring multi-band audio response and higher current drive |
Compared with LP55281RLX/NOPB, LP55231RLX/NOPB reduces channel count and removes audio functionality for cost-sensitive designs, while LP5562RSBT adds FFT-based audio processing and higher current but increases layout complexity and thermal footprint.
Availability
LP55281RLX/NOPB is available at Aetrix Electronics and suitable for smartphone status lighting, wearable fitness feedback, portable media player visualizers, and AR/VR headset ambient lighting requiring stable component supply and long-term production continuity.
Supply support for LP55281RLX/NOPB 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 IC design.
The LP55281RLX/NOPB belongs to TI's LP55xx family of highly integrated LED drivers, engineered specifically for battery-powered portable devices requiring compact, efficient, and intelligent lighting control with minimal MCU overhead.
FAQ
What is the maximum recommended LED current per channel on LP55281RLX/NOPB?
The LP55281RLX/NOPB supports up to 40 mA per RGB output (R1–R4, G1–G4, B1–B4) when configured with RRGB = 8.2 kΩ. This value derives from the internal current mirror ratio (1:100) and reference voltage (1.23 V), yielding IMAX = 1.23 V / 8.2 kΩ ≈ 150 µA × 100 = 15 mA typical - but datasheet specifies 40 mA absolute max per pin under recommended operating conditions. Always verify thermal limits with actual PCB layout.
How does the audio synchronization feature work on LP55281RLX/NOPB?
The LP55281RLX/NOPB implements audio sync digitally: ASE1 and ASE2 accept 0–1600 mVpp analog signals, which are mixed, digitized, DC-removed (–3 dB at 500 Hz), and processed by an AGC and peak detector. The resulting envelope modulates the ALED output with programmable hold time and refresh frequency - all without MCU involvement. Gain is set via GAIN_SEL[2:0], and threshold via THRESHOLD[3:0].
Can LP55281RLX/NOPB operate without the boost converter enabled?
Yes - LP55281RLX/NOPB can drive RGB LEDs from an external supply by disabling the boost converter (EN_BOOST = 0). In this mode, the RGB outputs reference VDD1/VDD2, and the ALED output remains functional. However, the boost must be disabled when no LED load is present to minimize quiescent current (typ. 350 µA vs. 0.6 mA with boost active and LEDs off).
What package type and dimensions does LP55281RLX/NOPB use?
LP55281RLX/NOPB uses a 36-ball DSBGA (Die Size Ball Grid Array) package, designated YPG or YZR, with nominal body size 2.982 mm × 2.982 mm and 0.4 mm ball pitch. It features 6 rows × 6 columns of solder balls, including dedicated ground balls (GNDA, GND_RGB1, GND_RGB2, GND_SW) for optimal noise isolation in LED-driving applications.
Does LP55281RLX/NOPB support I²C and SPI simultaneously?
No - LP55281RLX/NOPB supports either SPI or I²C, selected by the IF_SEL pin (high = SPI, low = I²C). Both interfaces share physical pins (SCK/SCL, SI/A0, SS/SDA, SO), and the device does not allow concurrent operation. I²C mode supports two slave addresses (0x30 and 0x32) for multi-device configurations; SPI uses standard 4-wire protocol with SS as chip select.
LP55281RLX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 36-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 12
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4V ~ 5.3V
- Current - Output / Channel:
- 40mA
- Frequency:
- 2MHz
- Dimming:
- I2C, SPI
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-DSBGA (3.5x3.24)
LP55281RLX/NOPB FAQ
1.How can I place an order for LP55281RLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP55281RLX/NOPB 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 LP55281RLX/NOPB reliable?
The price and inventory of LP55281RLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP55281RLX/NOPB is usually 5 days.
3.What payment methods are accepted for LP55281RLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP55281RLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP55281RLX/NOPB?
LP55281RLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP55281RLX/NOPB 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 LP55281RLX/NOPB?
For technical support, including LP55281RLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP55281RLX/NOPB requirements.
6.How does Aetrix verify that LP55281RLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP55281RLX/NOPB 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 LP55281RLX/NOPB meets industry standards.
7.What is the process for return or replacement of LP55281RLX/NOPB?
All LP55281RLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP55281RLX/NOPB, 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 LP55281RLX/NOPB part is unused and in its original packaging.
Return procedure for LP55281RLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP55281RLX/NOPB Tags
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