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Texas Instruments LP5569 I2C RGB LED Driver

Texas Instruments LP5569 I2C RGB LED Driver is a programmable, easy-to-use 9-channel I2C LED driver designed to produce lighting effects for various applications. The LED driver is equipped with an internal SRAM memory for user-programmed sequences and three programmable LED engines, which allow operation without processor control. Autonomous operation reduces system power consumption when the processor is in sleep mode. A high-efficiency charge pump enables the driving of LEDs with high VF, even with a 2.5V input voltage. The LP5569 LED driver maintains good efficiency over a wide operating voltage range by autonomously selecting the best charge-pump gain based on LED forward voltage requirements.

The Texas Instruments LP5569 device enters power-save mode when LEDs are not active, lowering idle-current consumption considerably. A flexible digital interface allows the connection of up to eight LP5569 devices with a unique I2C slave address for each device in the same system. This feature supports the synchronization of the lighting effects among all devices.

Features

  • 2.5V–5.5V supply voltage range 
  • Nine high-accuracy current sinks
    • 25.5mA maximum per channel
    • 8-bit individual current control
    • 12-bit 20kHz internal individual PWM control without audio noise
  • Three programmable LED engines
    • Independent illumination control without active microcontroller control
    • Synchronization among multiple devices
    • Up to 256 instructions in SRAM memory for storing sequences of lighting patterns
    • LP5523 and LP55231 device-compatible command set
  • Flexible dimming control
    • I2C dimming control
    • PWM direct-input dimming
    • 100Hz to 20kHz PWM input frequency 
  • Adaptive high-efficiency charge-pump control for driving high-VF LEDs with low battery voltage
  • Master fader control allows the dimming of multiple LEDs by writing to only one register to reduce the I2C bus traffic
  • 2µA low standby current and 10µA in automatic power-save mode when LEDs are inactive
  • POR, UVLO, and TSD protection

Applications

  • LED lighting, indicator lights, and fun lights for
    • Smart speaker
    • Smart home appliance
    • Doorbell
    • Electric lock
    • Smoke detector
    • Thermostat
    • Set-top box
    • Smart router
    • BLUETOOTH® headset
    • Cell phone

Functional Block Diagram

Block Diagram - Texas Instruments LP5569 I2C RGB LED Driver
Pubblicato: 2018-05-08 | Aggiornato: 2022-12-14