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Texas Instruments LP503x RGB LED Drivers

Texas Instruments LP503x RGB LED Drivers offer 30- or 36-channel constant-current-sink with a 29kHz, 12-Bit PWM generator for each channel. The LP503x RGB LED Drivers have channel/module-independent color mixing and intensity control registers to enable vivid LED effects with zero audible noise. The device provides benefits such as ultra-low shutdown Iq Power Saving Mode and straightforward software coding of the LP503x's three programmable RGB banks. The 29kHz, 12-Bit PWM resolution results in an intensity that decreases smoothly and stops audible noise. The LP503x Drivers implement a PWM phase-shifting function to help reduce the input power budget when LEDs turn on simultaneously. The device provides an automatic power-saving mode to get ultra-low quiescent current. The Texas Instruments LP503x RGB LED Drivers can be an alternative for battery-powered end equipment when channels are all off for 30ms and the device's total power consumption is down to 10µA.

Features

  • Operating voltage range
    • 2.7V to 5.5V VCC range 
    • EN, SDA, and SCL pins compatible with 1.8V, 3.3V, and 5V power rails
    • 6V output maximum voltage 
  • 36 constant-current sinks with high precision
    • 25.5mA maximum per channel when VCC in full range
    • 35mA maximum per channel when VCC ≥ 3.3V
    • Device-to-device error ±5%; channel-to-channel error ±5%
  • Integrated 12-bit, 29kHz PWM generator for each channel
    • Independent color-mixing register per channel
    • Independent brightness-control register per RGB LED module
    • Optional logarithmic- or linear-scale brightness control
    • Integrated 3-phase-shifting PWM scheme
  • Ultra-low quiescent current
    • Shutdown mode: 1µA (maximum) when EN is low
    • Power saving mode: 12µA (maximum) when EN is high and all LEDs are off for >30ms
  • Three programmable banks (R, G, B) for easy software control of each color
  • Two external hardware address pins allow connecting up to four devices
  • Broadcast slave address allows configuring multiple devices simultaneously
  • Auto-increment allows writing or reading consecutive registers within one transmission
  • Up to 400kHz fast-mode I2C speed

Applications

  • LED lighting, indicator lights, and fun lights for
    • Smart speaker
    • Smart home appliances
    • Video doorbell
    • Electric smart lock
    • Smoke detector
    • Set-top box
    • Smart router
    • Handheld devices

Block Diagram

Block Diagram - Texas Instruments LP503x RGB LED Drivers

Related Development Tool

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Evaluates the features of the LP5036, an I2C bus, 36-channel, constant-current LED driver.

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Published: 2019-03-20 | Updated: 2023-08-07