TI LP5009RUKR

High-performance RGB LED drivers are required for smart home and other applications that adopt human-machine interaction. LED animation effects such as blinking, breathing, and chasing can greatly improve the user experience. Meanwhile, minimizing system noise is also crucial. The LP50xx device is a 9/12-channel constant current sink LED driver. The LP50xx device includes integrated color mixing and brightness control, and its pre-configured features simplify the software coding process. The integrated 12-bit, 29kHz PWM generator for each channel makes the LED colors smooth and vivid and eliminates audible noise. The LP50xx device controls each LED output with a 29kHz switching frequency and 12-bit PWM resolution, which helps achieve smooth dimming effects and eliminates audible noise. Independent color mixing and intensity control registers simplify software coding. When implementing the fade-in and fade-out breathing effect, the global R, G, B group control can significantly reduce the microcontroller load. The LP50xx device also implements the PWM phase-shift function, which helps reduce the input power budget when the LEDs are turned on simultaneously. The LP50xx device implements an automatic power-saving mode to achieve ultra-low quiescent current. When all channels are turned off for 30ms, the total power consumption of the device drops to 10μA, making the LP50xx device a potential choice for battery-powered end devices.

The LP50xx device is a 9 or 12-channel constant current sink LED driver. The LP50xx device includes all necessary power rails, an on-chip oscillator, and a two-wire serial I²C interface. The maximum constant current value for all channels is set by a single external resistor. Two hardware address pins allow up to four devices to be connected on the same bus. An automatic power-saving mode is implemented to keep the total current consumption below 10μA, making the LP50xx device a potential choice for battery-powered end devices.

The LP50xx device is optimized for RGB LEDs in terms of real-time effects and software. The LP50xx device controls each LED output with a 29kHz switching frequency and 12-bit PWM resolution, which helps achieve smooth dimming effects.

• Operating voltage range:
  • VCC range: 2.7V to 5.5V; EN, SDA, and SCL pins compatible with 1.8V, 3.3V, and 5V supply rails
  • Maximum output voltage: 6V
• 12-channel high-accuracy constant current sinks
  • Maximum current per channel: 25.5mA across the full VCC range
  • Maximum current per channel: 35mA when VCC ≥ 3.3V
  • Device-to-device accuracy: ±5%; channel-to-channel accuracy: ±5%
• Integrated 12-bit, 29kHz PWM generator per channel
• Ultra-low quiescent current:
  • Shutdown mode: 1μA (maximum), EN low
  • Power-save mode: 10μA (typical), EN high with all LEDs off for more than 30ms
• Independent color mixing register per channel
• Independent brightness control register per RGB LED module
• Selectable logarithmic or linear dimming control
• Integrated three-phase PWM phase-shifting scheme
• 3 programmable groups (R, G, B) for easy per-color software control
• 2 external hardware address pins supporting up to 4 devices
• Broadcast slave address for simultaneous configuration of multiple devices

• Smart speakers (with voice assistant)
• Smart home appliances
• Video doorbells
• Electronic smart locks
• Smoke and heat detectors
• STB and DVR
• Smart routers
• Handheld devices