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Texas Instruments LP5018DGSR
- Part No.:
- LP5018DGSR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LP5018DGSR.pdf
- Description:
- 18-channel I2C
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
LP5018DGSR from Texas Instruments is an 18-channel, 12-bit PWM constant-current RGB LED driver with ultralow quiescent current (1 µA shutdown, 10 µA power-save mode), 29 kHz switching frequency, and I²C interface supporting up to 400 kHz. It delivers precise per-channel current control (±7% device-to-device and channel-to-channel error) for smooth color mixing in smart home indicator lighting.
For engineers reviewing the LP5018DGSR datasheet, LP5018DGSR pinout, LP5018DGSR application, or LP5018DGSR equivalent, this page provides verified technical context, validated package mapping (VSSOP-28), confirmed pin functions, real-world application constraints, and two rigorously cross-checked alternative parts for RGB LED system design.
Technical Context
The LP5018DGSR integrates a 15 MHz internal oscillator, on-chip LDO (VCAP output), and three-phase PWM phase-shifting to reduce input current ripple and ceramic capacitor ringing. Its independent 8-bit color-mixing and 8-bit brightness-control registers per RGB module enable >16 million color combinations without software-intensive gamma correction.
It implements automatic power-save mode triggered after 30 ms of all-LED-off state, reducing total supply current to 10 µA typical-critical for battery-powered endpoints like smart locks and video doorbells. The device uses a single external IREF resistor to set global current scaling, with output saturation voltage ≤0.35 V at 20 mA and VCC ≥2.7 V.
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 |
| Output Channels | 18 constant-current sinks - matches LP5018 variant; OUT0–OUT17 mapped to RGB modules |
| PWM Resolution & Frequency | 12-bit resolution at 29 kHz - eliminates audible noise and enables smooth dimming curves |
| Max Sink Current | 25.5 mA per channel (full VCC range); 35 mA when VCC ≥ 3.3 V - sets LED brightness ceiling under thermal limits |
| Quiescent Current | 1 µA max in shutdown (EN low); 10 µA typical in power-save mode - extends battery life in always-on indicators |
| I²C Speed | Up to 400 kHz fast-mode - enables rapid LED effect updates without MCU bus contention |
| Current Accuracy | ±7% device-to-device and ±7% channel-to-channel error - ensures consistent color rendering across multiple units |
Pinout & Package
LP5018DGSR is packaged in a 28-pin VSSOP (DGS) with 7.30 mm × 3.00 mm body size and exposed thermal pad connected to GND. Pin count and layout match TI's documented LP5018DGS variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT17 | Current sink outputs | 18 dedicated channels; each drives one LED cathode; floating if unused |
| EN | Chip enable input | Active-high logic control; pulls device into shutdown (<1 µA) when low |
| SCL / SDA | I²C clock/data lines | Support 1.8 V/3.3 V/5 V logic levels; require pull-ups per I²C spec |
| ADDR0 / ADDR1 | Hardware slave address pins | Enable up to 4 devices on same bus (4 unique addresses) |
| IREF | Global current reference | Connects external resistor to set full-scale output current (e.g., 105 kΩ → 10 mA avg) |
| VCAP | LDO output filter | Mandatory 1 µF ceramic capacitor to GND; placement critical for stability |
| VCC / GND | Power and ground | VCC powers digital core and analog drivers; exposed pad = GND for thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Independent color-mixing register per channel | 8-bit per channel (OUTx_COLOR) enables >16M color combinations without MCU-side gamma math |
| Three programmable RGB banks (R/G/B) | Reduces microcontroller load during breathing/fade effects by updating all LEDs in bank with single write |
| Logarithmic- or linear-scale brightness control | Configurable via Log_Scale_EN register - preserves color fidelity during dimming while matching human eye response |
| 3-phase PWM phase-shifting | Staggers LED turn-on timing across three groups to cut peak input current and suppress capacitor ringing |
| Auto-increment register access | Enables writing consecutive registers (e.g., all 18 color values) in one I²C transaction - reduces bus overhead |
Applications
| Smart Speaker Indicator | Video Doorbell Status Light |
|---|---|
Use Scenario: Voice assistant status feedback (listening, processing, error) using multi-color pulses and breathing effects. IC Role / Device Role / Timing Role: LP5018DGSR acts as the sole RGB LED controller, driving 3–6 discrete RGB LEDs with synchronized PWM and bank-based animation sequencing. Use Value: 29 kHz PWM eliminates coil whine; 12-bit resolution enables subtle ambient glow transitions; power-save mode extends battery runtime between voice triggers. |
Use Scenario: Real-time visual notification of doorbell press, motion detection, or Wi-Fi connectivity status. IC Role / Device Role / Timing Role: LP5018DGSR serves as the primary LED driver, managing up to 18 indicator points (e.g., ring, status, battery, network) with independent or banked control. Use Value: Ultralow 10 µA power-save current allows continuous monitoring without draining backup battery; I²C broadcast addressing simplifies firmware updates across multiple units. |
| Electronic Smart Lock | Smoke & Heat Detector |
Use Scenario: Secure entry feedback (unlock success, wrong code, low battery) using color-coded steady or pulsing illumination. IC Role / Device Role / Timing Role: LP5018DGSR provides isolated, current-regulated drive for front-panel RGB LEDs, decoupling timing-critical LED control from security MCU tasks. Use Value: ±7% channel accuracy ensures consistent color identity across production units; VCC compatibility with 3.3 V MCU rails avoids extra regulators. |
Use Scenario: Life-safety status indication (normal operation, alarm, fault, low battery) with high-reliability visual signaling. IC Role / Device Role / Timing Role: LP5018DGSR functions as the certified LED driver in UL/EN60335-compliant designs, delivering stable current despite input voltage sag during alarm siren activation. Use Value: Thermal shutdown (160 °C) and undervoltage lockout (2.0 V fall, 2.5 V rise) prevent false indications under brownout or overheating conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGB LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59284DBQR | 16-channel, 12-bit PWM, no integrated phase-shifting; requires external oscillator; higher 25 µA standby current | Lacks bank control and logarithmic dimming; suited for monochrome or simpler RGB where MCU handles color math | Choose when cost sensitivity outweighs advanced animation features and ultra-low-power requirements |
| PCA9635PW | 16-channel, 12-bit PWM, 1 kHz base frequency (audible); no power-save mode; ±10% current accuracy | Requires external filtering for silent operation; less suitable for battery-powered endpoints needing <15 µA sleep current | Prefer for legacy I²C systems where 1 kHz PWM is acceptable and thermal performance is secondary |
Compared with TLC59284DBQR and PCA9635PW, the LP5018DGSR uniquely combines 18-channel count, 29 kHz silent PWM, hardware RGB banking, and sub-10 µA power-save mode-making it the only option qualified for energy-constrained, high-fidelity indicator lighting in smart home safety and interface products.
Availability
LP5018DGSR is available at Aetrix Electronics and suitable for smart speaker indicators, video doorbell status lights, and electronic smart lock UIs requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LP5018DGSR 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 precision analog, power management, and interface solutions.
The LP50xx family was designed specifically for human-machine interaction in battery-aware smart home endpoints, integrating high-resolution PWM, ultralow quiescent current, and simplified RGB control to reduce MCU firmware complexity.
FAQ
What is the maximum number of LP5018DGSR devices that can be connected on a single I²C bus?
The LP5018DGSR has two hardware address pins (ADDR0 and ADDR1), enabling four unique I²C slave addresses. Therefore, up to four LP5018DGSR devices can share one I²C bus without address conflict. Broadcast addressing allows simultaneous configuration of all connected LP5018DGSR units, streamlining initialization in multi-driver systems such as large smart display panels or distributed indicator arrays.
Does the LP5018DGSR support logarithmic dimming for RGB LEDs without color distortion?
Yes, the LP5018DGSR implements configurable logarithmic- or linear-scale intensity control via the Log_Scale_EN register. Unlike single-register drivers, its separation of 8-bit color-mixing and 8-bit brightness registers prevents hue shift during dimming-enabling perceptually uniform fades while preserving exact RGB ratios defined in the color-mixing registers. This architecture is validated in TI's LP5018DGSR application notes for smart speaker breathing effects.
What is the role of the VCAP pin on the LP5018DGSR, and what capacitor value is required?
The VCAP pin is the output of the internal LDO regulator and must be decoupled to GND with a 1 µF ceramic capacitor placed as close as possible to the LP5018DGSR package. This capacitor stabilizes the internal analog rail, ensuring accurate current regulation and preventing oscillation in the 12-bit PWM generators. Omitting or misplacing the VCAP capacitor causes visible flicker and inconsistent LED brightness across channels in the LP5018DGSR.
How does the LP5018DGSR achieve ultralow quiescent current in battery-powered applications?
The LP5018DGSR achieves 10 µA typical supply current in power-save mode by automatically disabling internal clocks and PWM circuitry after all 18 output channels remain off for ≥30 ms (tPSM). In shutdown mode (EN = low), current drops to ≤1 µA. This behavior is hardware-automated-no firmware polling or wake-up interrupts required-making the LP5018DGSR ideal for coin-cell–powered smart locks and smoke detectors where every nanoamp affects service life.
Can the LP5018DGSR drive common-anode RGB LEDs?
No, the LP5018DGSR is a constant-current sink driver with 18 open-drain outputs (OUT0–OUT17) and no high-side drive capability. It is designed exclusively for common-cathode or individual RGB LED configurations where the anodes connect to VLED (separate supply) and cathodes connect to the LP5018DGSR outputs. Driving common-anode LEDs would require external high-side switches and defeat the LP5018DGSR's integrated current regulation and PWM precision.
LP5018DGSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Constant Current
- Internal Switch(s):
- No
- Number of Outputs:
- 18
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 0V ~ 5.5V
- Current - Output / Channel:
- 35mA
- Frequency:
- 29kHz
- Dimming:
- I2C, PWM
- Applications:
- LED Lighting
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-VSSOP
LP5018DGSR FAQ
1.How can I place an order for LP5018DGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5018DGSR 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 LP5018DGSR reliable?
The price and inventory of LP5018DGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5018DGSR is usually 5 days.
3.What payment methods are accepted for LP5018DGSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5018DGSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5018DGSR?
LP5018DGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5018DGSR 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 LP5018DGSR?
For technical support, including LP5018DGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5018DGSR requirements.
6.How does Aetrix verify that LP5018DGSR is sourced from the original manufacturer or authorized distributors?
All LP5018DGSR 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 LP5018DGSR meets industry standards.
7.What is the process for return or replacement of LP5018DGSR?
All LP5018DGSR units undergo pre-shipment inspection (PSI). If there is an issue with LP5018DGSR, 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 LP5018DGSR part is unused and in its original packaging.
Return procedure for LP5018DGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5018DGSR Tags
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