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Texas Instruments LP5811BDRRR
- Part No.:
- LP5811BDRRR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LP5811BDRRR.pdf
- Description:
- SYNCHRONOUS BOOST 4-CHANNEL RGBW
- Quantity:
- Payment:
- Shipping:
Inventory:3,013
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Product details
Overview
LP5811BDRRR from Texas Instruments is a synchronous boost 4-channel RGBW LED driver with autonomous animation engine, designed for battery-powered portable electronics. It delivers precise constant-current sinks (0.1–51 mA per channel), ultra-low active current (0.45 mA typ.), and integrated 3–5.5 V boost output with 95% efficiency at 4.2 V input/5.0 V output/300 mA load - enabling stable LED brightness across wide input voltage (0.5–5.5 V).
For engineers reviewing the LP5811BDRRR datasheet, LP5811BDRRR pinout, LP5811BDRRR application, or LP5811BDRRR equivalent, this device supports I²C-controlled analog/PWM dimming (up to 24 kHz), individual LED open/short detection, de-ghosting, and synchronized multi-device lighting via 6 MHz internal oscillator - critical for earbuds, smartwatches, VR headsets, and IoT indicators.
Technical Context
The LP5811BDRRR integrates a synchronous boost converter with 140 mΩ high-side and 60 mΩ low-side MOSFETs, operating in adaptive constant-on-time valley-current mode at 1 MHz (VIN > 1.5 V) or 0.5 MHz (VIN < 1 V). Its autonomous animation engine executes preloaded lighting sequences without MCU intervention, using register-configurable 8-bit dot current and PWM per channel.
It features true input-output disconnection during shutdown (ISD = 0.1 µA), pass-through mode when VIN exceeds VOUT setting, and dual-level protection: LED open detection (70–220 mV threshold) and short detection (32–68% of VOUT). The 12-pin WSON package supports compact layout with dedicated SYNC pin for inter-device timing alignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 0.5 V to 5.5 V - enables direct operation from single-cell Li-ion, Li-poly, or alkaline batteries without external regulation. |
| Boost output voltage | 3.0 V to 5.5 V in 0.1 V steps - matches forward voltage requirements of RGBW LEDs across varying color bins and temperature. |
| LED current range | 0.1 mA to 51 mA per channel - supports low-power status indicators and high-brightness notification LEDs with ±5% channel-to-channel matching. |
| PWM dimming frequency | Up to 24 kHz - eliminates audible noise in consumer audio-adjacent devices like earbuds and smart speakers. |
| I²C interface speed | Up to 1 MHz (Fast-mode Plus) - allows rapid configuration of all 4 channels and animation registers with minimal bus occupancy. |
| Ultra-low power states | Shutdown: 0.1 µA; Standby (data retained): 26 µA; Active (25.5 mA/channel): 0.45 mA - extends battery life in always-on wearable applications. |
| Thermal shutdown | 150 °C (LED driver) / 155 °C (boost) with 15 °C hysteresis - ensures safe operation under sustained high-current or high-ambient conditions. |
Pinout & Package
LP5811BDRRR uses a 12-pin WSON package (3 mm × 3 mm, 0.5 mm pitch) with wettable flanks for automated optical inspection. Thermal resistance RθJA is 47.5 °C/W, enabling reliable operation in space-constrained portable designs without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high control of boost converter; pulls device into full shutdown (0.1 µA) when low. |
| VIN | Power supply input | Accepts 0.5–5.5 V; powers internal logic and boost controller; requires 10 µF local ceramic capacitor. |
| SW | Boost switch node | Connects to inductor; carries switching current; must be routed with low-inductance path to minimize EMI. |
| OUT0–OUT3 | Constant-current LED sink outputs | Four independent current sinks (0.1–51 mA); each drives one RGBW LED anode via external cathode connection. |
| GND | Ground reference | Common return for boost, LED, and logic; must connect to low-impedance PCB ground plane. |
| VOUT | Boost output | Regulated 3–5.5 V supply; powers LED strings and optionally other system loads; requires 22 µF bulk capacitor. |
| SYNC | Synchronization I/O | Outputs 6 MHz clock or accepts external sync signal to align animation timing across multiple LP5811BDRRR devices. |
| SCL/SDA | I²C interface | Standard 1 MHz Fast-mode Plus bus; supports up to 4 devices on same bus via unique chip address bits (0/1). |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous animation engine | Executes register-defined lighting sequences (fade, blink, chase) without MCU CPU cycles - reduces host firmware overhead in wearables. |
| Ultra-low headroom voltage | 110 mV (typ.) at 25.5 mA - minimizes voltage drop across current sink, maximizing usable VOUT margin for high-Vf white LEDs. |
| Integrated de-ghosting | Hardware-based cross-talk suppression between adjacent LED channels - prevents unintended illumination during fast PWM transitions. |
| Individual LED fault detection | Detects open-circuit (70–220 mV threshold) and short-circuit (32–68% of VOUT) per channel - enables robust failure reporting in safety-critical UIs. |
| Pass-through mode | Direct VIN-to-VOUT conduction when VIN > VOUT setting - bypasses boost losses to improve efficiency in higher-battery-voltage scenarios. |
Applications
| Earbud Charging Case Indicator | Smartwatch Status Lighting |
|---|---|
Use Scenario: Real-time battery level and pairing status indication on compact wireless earbud charging case. IC Role / Device Role / Timing Role: LP5811BDRRR drives RGBW LEDs with autonomous breathing/fade animations, synchronized via SYNC pin across case and earbuds. Use Value: Eliminates need for dedicated MCU GPIOs and timing code; achieves consistent color-matched illumination using ±5% channel matching and 24 kHz PWM. |
Use Scenario: Always-on ambient light sensor–adjusted notification rings and health-monitoring pulse indicators on wrist-worn displays. IC Role / Device Role / Timing Role: LP5811BDRRR operates in ultra-low-power standby (26 µA) with retained register state, waking only for scheduled LED updates. Use Value: Extends coin-cell or small Li-poly battery life beyond 7 days; 0.1 mA minimum current sink enables visible dimming at sub-100 µA total system current. |
| VR Headset Presence Detection | IoT Video Doorbell LED Ring |
Use Scenario: Multi-color proximity and user presence feedback on VR headset temples during setup and calibration. IC Role / Device Role / Timing Role: LP5811BDRRR drives four discrete LEDs with individually phase-shifted PWM to create smooth directional glow effects. Use Value: Phase-shift capability prevents simultaneous current surges, reducing peak input current and minimizing EMI near sensitive IMU sensors. |
Use Scenario: 360° ring illumination for motion-triggered video capture and two-way audio activation on battery-powered doorbells. IC Role / Device Role / Timing Role: LP5811BDRRR powers white LED ring via VOUT while driving RGB status LEDs via OUT0–OUT2, using I²C for remote brightness control. Use Value: Single-chip solution replaces discrete boost + 4x current sources; 95% boost efficiency sustains 500-lumen output for >6 months on 2×AA alkalines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGBW LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5813BDRRR | 12-channel output, same WSON-12 package and I²C interface; identical boost architecture and autonomous engine. | Supports larger LED arrays (e.g., gaming mouse RGB zones, router status bars); requires revised PCB layout for additional OUT pins. | Select LP5813BDRRR when expanding from 4 to 12 LEDs without changing MCU firmware structure or power architecture. |
| LP5810BDRRR | 4-channel linear (not boost) driver; no integrated DC-DC; max Vf support limited to VIN – 0.21 V; lower quiescent current (0.35 mA active). | Suitable only for low-Vf indicator LEDs (e.g., red/green) powered directly from regulated 3.3 V rail; cannot drive white/blue LEDs from 1.8–3.6 V batteries. | Choose LP5810BDRRR for cost-sensitive, low-brightness applications where input voltage exceeds LED forward voltage by ≥210 mV. |
Compared with LP5813BDRRR and LP5810BDRRR, the LP5811BDRRR uniquely balances 4-channel flexibility, integrated boost for battery-direct operation, and autonomous animation - making it optimal for compact, energy-constrained RGBW UIs where board space and firmware simplicity are critical.
Availability
LP5811BDRRR is available at Aetrix Electronics and suitable for portable electronics, wearable UIs, and IoT indicator systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP5811BDRRR 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 solutions for industrial, automotive, and consumer markets.
The LP5811BDRRR belongs to TI's LP58xx family of intelligent LED drivers, engineered specifically for battery-powered human-interface lighting - emphasizing ultra-low power, autonomous control, and seamless integration into space- and energy-constrained portable designs.
FAQ
What is the minimum input voltage required to start up the LP5811BDRRR?
The LP5811BDRRR requires a minimum of 1.8 V on VIN to initiate startup; once enabled, it continues operating down to 0.5 V. This 1.8 V UVLO rising threshold ensures reliable boot from partially discharged batteries while maintaining functionality across wide discharge curves. The LP5811BDRRR achieves this with internal charge-pump-assisted gate drive for the high-side MOSFET.
How does the LP5811BDRRR handle LED open-circuit faults?
The LP5811BDRRR performs individual open-circuit detection on each OUTx pin using a 70–220 mV threshold dependent on programmed current (25.5 mA or 51 mA range). When detected, it flags the fault in the status register and maintains operation of remaining channels - ensuring partial UI functionality remains intact in devices like smartwatches or earbuds where single-LED failure must not disable all indicators.
Can the LP5811BDRRR drive white LEDs from a 3.0 V lithium coin cell?
Yes - the LP5811BDRRR's integrated synchronous boost converter generates adjustable VOUT (3.0–5.5 V), enabling it to drive typical white LEDs (Vf ≈ 3.0–3.6 V) directly from a 3.0 V coin cell. Its 110 mV headroom at 25.5 mA ensures sufficient margin even as battery voltage drops to 2.5 V, and 95% efficiency preserves runtime. The LP5811BDRRR also supports pass-through mode if VOUT is set ≤ VIN.
What is the purpose of the SYNC pin on the LP5811BDRRR?
The SYNC pin on the LP5811BDRRR provides hardware-level synchronization between multiple devices: it can output a 6 MHz clock for timing alignment or accept an external sync signal to coordinate animation phases. This eliminates software-based frame-synchronization delays, ensuring pixel-perfect lighting effects across multi-unit products like VR headset pairs or modular speaker arrays - a capability not available in basic LED drivers.
Does the LP5811BDRRR support both linear and exponential PWM dimming curves?
Yes - the LP5811BDRRR supports selectable dimming curves per channel: linear for precise engineering control or exponential to match human eye perception (gamma ≈ 2.2). This is configured via the pwm_curve_x register bit. Exponential mode enables smoother perceived brightness transitions at low duty cycles - critical for subtle status indicators in low-light environments like smartwatches or night-mode earbuds - without requiring MCU-side gamma correction.
LP5811BDRRR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 500mV
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 3V ~ 5.5V
- Current - Output / Channel:
- 1.6A
- Frequency:
- 500kHz, 1MHz
- Dimming:
- Analog, PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WSON (3x3)
LP5811BDRRR FAQ
1.How can I place an order for LP5811BDRRR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5811BDRRR 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 LP5811BDRRR reliable?
The price and inventory of LP5811BDRRR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5811BDRRR is usually 5 days.
3.What payment methods are accepted for LP5811BDRRR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5811BDRRR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5811BDRRR?
LP5811BDRRR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5811BDRRR 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 LP5811BDRRR?
For technical support, including LP5811BDRRR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5811BDRRR requirements.
6.How does Aetrix verify that LP5811BDRRR is sourced from the original manufacturer or authorized distributors?
All LP5811BDRRR 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 LP5811BDRRR meets industry standards.
7.What is the process for return or replacement of LP5811BDRRR?
All LP5811BDRRR units undergo pre-shipment inspection (PSI). If there is an issue with LP5811BDRRR, 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 LP5811BDRRR part is unused and in its original packaging.
Return procedure for LP5811BDRRR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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