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Texas Instruments LP5811CDRRR
- Part No.:
- LP5811CDRRR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LP5811CDRRR.pdf
- Description:
- SYNCHRONOUS BOOST 4-CHANNEL RGBW
- Quantity:
- Payment:
- Shipping:
Inventory:4,333
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Product details
Overview
LP5811CDRRR from Texas Instruments is a synchronous boost 4-channel RGBW LED driver with autonomous animation engine, designed for battery-powered portable devices. It operates from 0.5V to 5.5V input, delivers 3V–5.5V regulated output via integrated 140mΩ/60mΩ MOSFETs, supports 0.1–51mA per channel with ±5% device-to-device and channel-to-channel current accuracy, and enables audible-noise-free 24kHz PWM dimming - ideal for earbud status lighting and smartwatch ambient indicators.
For engineers reviewing the LP5811CDRRR datasheet, LP5811CDRRR pinout, LP5811CDRRR application, or LP5811CDRRR equivalent, key selection considerations include its WSON-12 package, 1.6A valley current limit, ultra-low 0.45mA active supply current at 25.5mA LED load, autonomous animation register control, and I²C-compatible 1MHz interface with SYNC pin for multi-device synchronization.
Technical Context
The LP5811CDRRR integrates a quasi-constant-frequency synchronous boost converter (1MHz PWM / 0.5MHz PFM) with adaptive on-time valley-current control, enabling stable LED brightness across wide input voltage ranges. Its dual-mode dimming combines 8-bit analog current gain (MC/DC) and 8-bit PWM with linear/exponential curves, while the autonomous animation engine offloads MCU real-time control via preconfigured register sequences.
Each of the four constant-current sinks features ultra-low 110mV headroom at 25.5mA and integrated open/short detection (70–220mV LOD threshold), supported by de-ghosting logic and true input-output disconnection during shutdown. The device uses a 6MHz internal oscillator for inter-device timing sync and supports up to four LP581x variants on one I²C bus via configurable chip address bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.5V to 5.5V - supports single-cell Li-ion down to partially discharged states; 1.8V minimum for startup ensures reliable cold-boot in wearables. |
| Boost Output Range | 3.0V to 5.5V in 0.1V steps - matches forward voltage of RGBW LEDs (e.g., 2.8V red + 3.2V blue + 3.0V white) without external regulation. |
| LED Current Range | 0.1–51mA per channel - selectable via 1-bit MC (25.5/51mA max) and 8-bit DC (256-step resolution), enabling precise low-power indicator or high-brightness status lighting. |
| Current Accuracy | ±5% device-to-device & channel-to-channel - ensures uniform color balance across RGBW channels without per-unit calibration. |
| PWM Frequency | Up to 24kHz - eliminates audible coil whine in compact enclosures like earbuds and VR headsets. |
| Supply Current | 0.45mA typical in active mode (25.5mA LED load) - extends battery life in always-on indication applications. |
| I²C Interface | Up to 1MHz Fast-mode Plus - enables rapid configuration of animation sequences and real-time brightness updates. |
Pinout & Package
LP5811CDRRR is housed in a thermally enhanced 3mm × 3mm WSON-12 package (DRR suffix), with exposed thermal pad for efficient heat dissipation in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high control of boost converter; <0.42V disables boost and disconnects input from output. |
| VIN | Main power input | Accepts 0.5–5.5V supply; requires 10μF local decoupling for stability during boost transients. |
| SW | Boost switch node | Connects to inductor; carries switching current through integrated 140mΩ HS / 60mΩ LS MOSFETs. |
| GND | Power ground | Common reference for boost stage and LED sinks; must connect to low-impedance PCB plane. |
| VOUT | Boost output | Regulated 3–5.5V supply for LEDs and external loads; requires 22μF bulk capacitance. |
| OUT0–OUT3 | Constant-current LED sinks | Four independent outputs driving RGBW LEDs; each supports 0.1–51mA with 110mV headroom at 25.5mA. |
| SCL/SDA | I²C interface | Standard 1MHz Fast-mode Plus bus; SDA is open-drain, SCL is input-only. |
| SYNC | Multi-device synchronization | Output-only clock signal (6MHz) for aligning animation timing across multiple LP5811CDRRR devices. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous animation engine | Offloads MCU by executing preloaded lighting sequences (fade, blink, chase) via register-based state machines - reduces firmware overhead in resource-limited microcontrollers. |
| True input-output disconnection | Zero leakage path between VIN and VOUT during shutdown (ISD = 0.1μA typ.), preventing battery drain in powered-off systems. |
| Integrated LED fault detection | Detects open-circuit (70–220mV threshold) and short-circuit (32–68% of VOUT) conditions per channel, enabling fail-safe UI feedback without external sensing. |
| Pass-through mode | When VIN > VOUT setting, boost bypasses and VOUT connects directly to VIN - improves efficiency in high-input-voltage scenarios (e.g., USB-charged devices). |
| De-ghosting function | Eliminates unintended LED crosstalk during multiplexed driving, critical for accurate RGBW color mixing in tight-pitch LED arrays. |
Applications
| Earbud Charging Case Status Lighting | Smartwatch Ambient Notification Ring |
|---|---|
Use Scenario: Real-time battery level and pairing status indication on compact wireless earbud charging cases. IC Role / Device Role / Timing Role: LP5811CDRRR drives four discrete RGBW LEDs with synchronized fade animations using autonomous engine, eliminating MCU polling. Use Value: 0.45mA active current extends case battery life; 24kHz PWM prevents audible noise in acoustically sensitive earbud enclosures. |
Use Scenario: Circular ambient light ring around smartwatch bezel for silent notifications, fitness tracking pulses, and low-power time-of-day cues. IC Role / Device Role / Timing Role: LP5811CDRRR acts as standalone timing-aware LED controller, using SYNC pin to coordinate multi-segment lighting with sub-millisecond precision. Use Value: ±5% channel matching ensures consistent white-point color across ring segments; 110mV headroom enables use of low-Vf green/yellow LEDs without headroom margin loss. |
| VR Headset Power-On Sequence | IoT Video Doorbell Indicator |
Use Scenario: Multi-stage boot-up lighting sequence (e.g., blue → purple → white) signaling VR headset initialization and sensor readiness. IC Role / Device Role / Timing Role: LP5811CDRRR executes autonomous animation from nonvolatile register settings, triggered by EN pin assertion at system power-on. Use Value: 450μs soft-start ensures clean VOUT ramp without inrush-induced voltage droop on shared battery rail. |
Use Scenario: Dual-color (red/green) status LED on battery-powered video doorbell indicating motion detection (green flash) vs. call active (red pulse). IC Role / Device Role / Timing Role: LP5811CDRRR provides independent current control and PWM dimming per channel, enabling simultaneous distinct behaviors without MCU intervention. Use Value: 0.1μA shutdown current preserves months of standby battery life; I²C address configurability allows coexistence with other TI LED drivers on same bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel RGBW LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5811ADRRR | Same silicon, identical electrical specs; differs only in I²C chip address (bit4=0, bit3=0 vs. LP5811CDRRR's bit4=1, bit3=0). | Enables parallel operation of up to four LP5811 variants on one I²C bus without address conflict. | Select LP5811ADRRR when building multi-driver systems requiring distinct I²C addresses; no layout or firmware changes needed beyond address configuration. |
| LP5813CDRRR | 12-channel variant with identical boost architecture, same WSON-12 package, but higher channel count and extended register set. | Supports complex multi-zone lighting (e.g., RGBW + status + proximity) where LP5811CDRRR's 4 channels are insufficient. | Choose LP5813CDRRR when future scalability to >4 LEDs is required; shares footprint and basic command structure but needs updated animation register mapping. |
Compared with LP5811ADRRR, LP5811CDRRR offers identical performance with a different I²C address for bus arbitration; versus LP5813CDRRR, it trades channel count for lower gate count and simpler register management - making LP5811CDRRR optimal for cost-sensitive, compact 4-LED applications where full 12-channel capability is unnecessary.
Availability
LP5811CDRRR is available at Aetrix Electronics and suitable for portable electronics, wearable UI lighting, and IoT edge device status indication requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP5811CDRRR 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 and embedded processing technologies, with decades of expertise in power management and LED driver innovation.
The LP5811CDRRR belongs to TI's LP58xx family of autonomous LED drivers, engineered specifically for ultra-low-power, multi-color lighting in battery-constrained portable and wearable systems - prioritizing efficiency, integration, and MCU offload capability.
FAQ
What is the minimum input voltage required to start up the LP5811CDRRR?
The LP5811CDRRR requires a minimum of 1.8V on the VIN pin to initiate startup and enable the boost converter. Once operational, it sustains regulation down to 0.5V input - enabling use in deeply discharged single-cell Li-ion or coin-cell applications. This 1.8V UVLO rising threshold is confirmed in Section 6.5 of the datasheet under VIN_UVLO test conditions.
Does the LP5811CDRRR support true hardware shutdown with zero current draw?
Yes - when the EN pin is pulled below 0.42V, the LP5811CDRRR enters full shutdown mode with typical supply current of 0.1μA into VIN and SW pins. In this state, the internal boost converter disconnects VIN from VOUT, eliminating leakage paths. This behavior is specified in Table 6-5 as ISD (shutdown current) and verified across temperature.
How does the LP5811CDRRR achieve audible-noise-free PWM dimming?
The LP5811CDRRR achieves audible-noise-free operation by supporting PWM frequencies up to 24kHz - well above the human hearing range (20kHz). This is implemented via an integrated 8-bit PWM generator with selectable linear or exponential dimming curves, and is validated in Section 6.5 (fLED_PWM parameter) and Figure 6-6 of the datasheet.
Can the LP5811CDRRR drive LEDs with different forward voltages simultaneously?
Yes - the LP5811CDRRR's 4-channel architecture allows independent current sink control per OUT0–OUT3, and its programmable VOUT (3.0–5.5V in 0.1V steps) accommodates mixed LED types (e.g., 2.8V red, 3.2V blue, 3.0V white). Each channel maintains ≤210mV headroom at 51mA, ensuring stable current regulation even with Vf mismatches.
What is the role of the SYNC pin on the LP5811CDRRR?
The SYNC pin on the LP5811CDRRR outputs a 6MHz clock signal used to synchronize lighting animations across multiple LP5811CDRRR devices. This enables precise inter-device timing alignment for seamless multi-unit effects (e.g., cascading light bars), and is generated internally - no external clock source required. Its function is detailed in Section 7.2 (Functional Block Diagram) and Section 5 (Pin Functions).
LP5811CDRRR 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)
LP5811CDRRR FAQ
1.How can I place an order for LP5811CDRRR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5811CDRRR 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 LP5811CDRRR reliable?
The price and inventory of LP5811CDRRR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5811CDRRR is usually 5 days.
3.What payment methods are accepted for LP5811CDRRR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5811CDRRR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5811CDRRR?
LP5811CDRRR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5811CDRRR 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 LP5811CDRRR?
For technical support, including LP5811CDRRR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5811CDRRR requirements.
6.How does Aetrix verify that LP5811CDRRR is sourced from the original manufacturer or authorized distributors?
All LP5811CDRRR 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 LP5811CDRRR meets industry standards.
7.What is the process for return or replacement of LP5811CDRRR?
All LP5811CDRRR units undergo pre-shipment inspection (PSI). If there is an issue with LP5811CDRRR, 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 LP5811CDRRR part is unused and in its original packaging.
Return procedure for LP5811CDRRR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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