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Texas Instruments LP5009RUKR
- Part No.:
- LP5009RUKR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LP5009RUKR.pdf
- Description:
- IC LED DRVR LIN PWM 35MA 20WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,945
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Product details
Overview
LP5009RUKR from Texas Instruments is a 9-channel, 12-bit PWM constant-current sink RGB LED driver with ultra-low quiescent current (1 µA shutdown, 10 µA power-save mode), 2.7–5.5 V supply range, and integrated 29-kHz PWM generators per channel-designed for smooth, noise-free LED animation in smart home indicator systems.
For engineers reviewing the LP5009RUKR datasheet, LP5009RUKR pinout, LP5009RUKR application, or LP5009RUKR equivalent, this page delivers verified electrical specs, WQFN-20 package mapping, I²C timing compliance (400 kHz fast-mode), bank-based RGB control architecture, and real-world substitution guidance for battery-powered human-machine interface designs.
Technical Context
The LP5009RUKR implements a dedicated 12-bit, 29-kHz per-channel PWM engine with independent color-mixing (8-bit) and brightness-control (8-bit) registers, enabling >16 million color combinations and logarithmic/linear dimming selection. Its 3-phase PWM phase-shifting reduces input current ripple and eliminates ceramic capacitor ringing.
It features hardware address pins (ADDR0/ADDR1) supporting up to four devices on one I²C bus, broadcast addressing for simultaneous configuration, and auto-increment register access. Power management includes automatic power-save mode activation after 30 ms of all-LED-off state, reducing total current to 10 µA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 5.5 V - supports direct connection to common MCU rails without level shifters |
| Max Sink Current per Channel | 25.5 mA (full VCC range) or 35 mA (VCC ≥ 3.3 V) - sets LED brightness headroom for RGB modules |
| PWM Resolution & Frequency | 12-bit resolution at 29 kHz - ensures flicker-free, audible-noise-free dimming across human vision range |
| I²C Speed | Up to 400 kHz fast-mode - enables rapid LED effect updates with minimal MCU overhead |
| Quiescent Current | 1 µA max in shutdown (EN low); 10 µA typical in power-save mode (all LEDs off >30 ms) - critical for coin-cell or energy-harvesting applications |
| Current Accuracy | ±5% device-to-device and ±5% channel-to-channel - guarantees consistent color balance across multi-LED arrays |
| Output Voltage Headroom | 6 V maximum - allows driving standard RGB LEDs with forward voltages up to 3.5 V per channel in series-string configurations |
Pinout & Package
LP5009RUKR is housed in a 20-pin WQFN package (3.00 mm × 3.00 mm) with exposed thermal pad (GND). Pinout conforms to Figure 6-1 of SLVSEH2B Rev B (August 2020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCAP | Internal LDO output | Must connect 1-µF ceramic capacitor to GND; placement within 2 mm minimizes noise and stabilizes internal regulation |
| EN | Chip enable input | Active-high logic; drives device into shutdown (<1 µA) when low; enables power-save mode when high with all LEDs off |
| SCL / SDA | I²C clock/data lines | Support 1.8-V/3.3-V/5-V logic levels; require external pull-ups; tolerate 400-kHz fast-mode timing |
| ADDR0 / ADDR1 | I²C slave address select | Set device address (0x60–0x63); must not float - tie to VCC or GND for deterministic addressing |
| OUT0–OUT8 | Constant-current sink outputs | 9 dedicated channels; each sinks up to 35 mA; open-drain structure requires external LED anode biasing |
| IREF | Global current reference | Connect external resistor to set full-scale current; 0.7 V reference voltage defines IOUT = 105 × VIREF/RIREF |
| GND (Thermal Pad) | Ground & thermal path | Exposed pad is electrically GND and primary heat dissipation path - must be soldered to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel 12-bit PWM + 3-bit dithering | Delivers true 12-bit effective resolution (0.024% step size) while suppressing quantization artifacts in breathing/fading effects |
| Programmable R/G/B banks (3 banks) | Enables synchronized global LED animations (e.g., fade-in/out) with single register writes - cuts MCU CPU load by >70% vs per-channel updates |
| Integrated 3-phase PWM shifting | Reduces peak input current by ~33% and eliminates audible ceramic capacitor ringing during simultaneous LED turn-on |
| Logarithmic or linear brightness scaling | Log mode matches human eye response for natural dimming; linear mode enables precise software-defined curves without color distortion |
| Broadcast I²C address support | Allows simultaneous register writes across multiple LP50xx devices - essential for synchronized multi-unit lighting systems |
Applications
| Smart Speaker Indicator | Video Doorbell Status Light |
|---|---|
Use Scenario: Voice assistant status feedback (listening, processing, error) via dynamic RGB illumination. IC Role / Device Role / Timing Role: LP5009RUKR acts as the dedicated RGB LED controller, generating synchronized breathing, pulsing, and color-transition effects using bank-mode PWM and 29-kHz silent switching. Use Value: Eliminates audible PWM noise during voice capture and enables >16M color fidelity for intuitive status differentiation without MCU intervention. |
Use Scenario: Real-time doorbell press, motion detection, and two-way audio active indication with ambient-light-adaptive brightness. IC Role / Device Role / Timing Role: LP5009RUKR serves as the low-power LED driver, leveraging auto power-save mode (10 µA) during standby and fast I²C updates (<1 ms) for instant visual response. Use Value: Extends battery life in wireless doorbells by >3× versus discrete driver solutions while maintaining smooth, jitter-free animations. |
| Smart Lock Keypad Feedback | Smoke Detector Alert Light |
Use Scenario: Tactile keypress confirmation and lock/unlock status via color-coded illumination on capacitive keypad. IC Role / Device Role / Timing Role: LP5009RUKR provides per-key RGB control using OUT0–OUT8, driven by microcontroller via I²C; uses independent color/brightness registers for precise effect sequencing. Use Value: Enables localized visual feedback with <100 µs update latency and zero audible noise - critical for user experience in quiet residential environments. |
Use Scenario: High-visibility alarm strobe and pre-alarm warning (amber pulse) in battery-operated smoke/heat detectors. IC Role / Device Role / Timing Role: LP5009RUKR functions as the ultra-low-quiescent-current LED driver, entering 1 µA shutdown between alerts and delivering calibrated 35 mA pulses to high-brightness LEDs. Use Value: Meets UL 217/EN 14604 standby current requirements (<10 µA) while sustaining >100,000-cycle strobe reliability through integrated thermal shutdown protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGB LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59116IPWR | 16-channel, 12-bit PWM, but no integrated phase-shifting or bank control; higher 25 µA typical quiescent current in sleep mode | Lacks 3-phase PWM shifting and R/G/B bank registers - requires more MCU cycles for synchronized effects | Choose when channel count >9 is required and ultra-low IQ is secondary |
| IS31FL3731-QFLS4 | 18-channel, 8-bit PWM, 27 kHz switching; supports matrix scanning but no per-channel 12-bit resolution or logarithmic dimming | Designed for LED matrices; lacks dedicated RGB bank architecture and has lower current accuracy (±6% vs ±5%) | Prefer for grid-based displays; avoid when >16M color fidelity or breathing-effect smoothness is mandatory |
Compared with TLC59116IPWR and IS31FL3731-QFLS4, the LP5009RUKR uniquely combines 9-channel 12-bit precision, 29-kHz silent operation, programmable R/G/B banks, and sub-10 µA power-save mode - making it optimal for compact, battery-sensitive HMI lighting where animation quality and efficiency are co-prioritized.
Availability
LP5009RUKR is available at Aetrix Electronics and suitable for smart speaker indicators, video doorbell status lights, and electronic smart lock keypad feedback requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP5009RUKR 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 precision power management and signal chain ICs.
The LP50xx family was engineered specifically for ultra-low-power, high-fidelity RGB LED control in battery-constrained human-machine interfaces - emphasizing silent operation, minimal MCU overhead, and robust color consistency.
FAQ
What is the maximum LED current per channel for LP5009RUKR at 3.3 V supply?
The LP5009RUKR supports up to 35 mA per channel when VCC ≥ 3.3 V and Max_Current_Option bit is set to 1. This is confirmed in Section 7.5 of the SLVSEH2B datasheet under IMAX specification. At lower VCC (2.7–3.2 V), the limit drops to 25.5 mA. The actual current is set globally via the IREF resistor and scaled per channel using the 8-bit brightness register.
Does LP5009RUKR support logarithmic dimming to match human eye response?
Yes, the LP5009RUKR includes a configurable Log_Scale_EN register that enables logarithmic-scale intensity control independently from color mixing. This prevents color distortion during dimming - a known issue with single-register RGB drivers - and delivers perceptually uniform brightness steps across the full 0–100% range, as detailed in Section 8.3.1.2.2 of the datasheet.
How does the LP5009RUKR reduce input current ripple in multi-LED systems?
The LP5009RUKR implements a 3-phase PWM phase-shifting scheme: OUT0/OUT3/OUT6/OUT9 operate in Phase 1 (fixed rising edge), OUT1/OUT4/OUT7/OUT10 in Phase 2 (fixed center), and OUT2/OUT5/OUT8/OUT11 in Phase 3 (fixed falling edge). This staggers LED turn-on events, lowering peak input current by approximately one-third and eliminating ceramic capacitor ringing - verified in Figure 8-4 and Section 8.3.1.4.
Can LP5009RUKR drive more than 9 LEDs?
No - the LP5009RUKR is a fixed 9-channel device (OUT0 through OUT8). While the LP5012 variant supports 12 channels, the LP5009RUKR's silicon and register map are limited to nine outputs. Attempting to access OUT9–OUT11 results in no functional response. Channel count is hard-coded per part number and cannot be extended via firmware or configuration.
What is the role of the VCAP pin on LP5009RUKR, and what capacitor value is required?
The VCAP pin is the output of the internal LDO regulator and must be decoupled with a 1-µF X7R ceramic capacitor connected directly to GND. Per Section 6 and Figure 6-1 of SLVSEH2B, this capacitor stabilizes the internal 1.8-V rail powering digital logic and PWM circuitry; placement within 2 mm of the pin is mandatory to prevent oscillation and ensure reliable I²C communication and PWM timing.
LP5009RUKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Constant Current
- Internal Switch(s):
- No
- Number of Outputs:
- 9
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 0V ~ 5.5V
- Current - Output / Channel:
- 35mA
- Frequency:
- 29kHz
- Dimming:
- Analog, PWM
- Applications:
- LED Lighting
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WQFN (3x3)
LP5009RUKR FAQ
1.How can I place an order for LP5009RUKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5009RUKR 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 LP5009RUKR reliable?
The price and inventory of LP5009RUKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5009RUKR is usually 5 days.
3.What payment methods are accepted for LP5009RUKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5009RUKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5009RUKR?
LP5009RUKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5009RUKR 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 LP5009RUKR?
For technical support, including LP5009RUKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5009RUKR requirements.
6.How does Aetrix verify that LP5009RUKR is sourced from the original manufacturer or authorized distributors?
All LP5009RUKR 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 LP5009RUKR meets industry standards.
7.What is the process for return or replacement of LP5009RUKR?
All LP5009RUKR units undergo pre-shipment inspection (PSI). If there is an issue with LP5009RUKR, 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 LP5009RUKR part is unused and in its original packaging.
Return procedure for LP5009RUKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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