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18-Channel I2C Constant-Current RGB LED Driver

Availability: 13,560


Package | PIN: VQFN (RSM) | 32
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $1.73
10-24 $1.55
25-99 $1.44
100-249 $1.25
250-499 $1.16
500-749 $0.97
750-999 $0.80
1000+ $0.73


  • Operating Voltage Range:
    • VCC Range: 2.7 V to 5.5V
    • EN, SDA, and SCL Pins Compatible With
      1.8-V, 3.3-V, and 5-V Power Rails
    • OutputMaximum Voltage: 6 V
  • 24 Constant-Current Sinks With High Precision
    • 25.5 mA Maximum per Channel WithVCC in Full Range
    • 35 mA Maximum perChannel When VCC ≥ 3.3 V
    • Device-to-Device Error: ±7%; Channel-to-Channel Error:±7%
  • Ultralow Quiescent Current:
    • Shutdown Mode: 1 µA (Maximum) With EN Low
    • Power Saving Mode: 10 µA (Typical) With EN High and AllLEDs Off for > 30 ms
  • Integrated 12-Bit, 29-kHz PWM Generator for Each Channel:
    • Independent Color-Mixing Register Per Channel
    • Independent Brightness-Control Register Per RGB LEDModule
    • Optional Logarithmic- or Linear-Scale BrightnessControl
    • Integrated 3-Phase PWM-ShiftingScheme
  • 3 Programmable Banks (R, G, B) for Easy Software Control of Each Color
  • 2 External Hardware Address Pins Allow Connecting up to 4 Devices
  • Broadcast Slave Address Allows Configuring Multiple Devices Simultaneously
  • Auto-Increment Allows Writing or Reading Consecutive Registers Within One Transmission
  • Up to 400-kHz Fast-Mode I2C Speed

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Texas Instruments  LP5018RSMR

In smart homes and other applications that utilize human-machine-interaction,high-performance RGB LED drivers are required. LED animation effects such as flashing, breathing,and chasing greatly improve user experience, and minimal system noise is essential.

The LP50xx device is an 18- or 24-channel constant current sink LED driver. The LP50xxdevice includes integrated color mixing and brightness control, and pre-configuration simplifiesthe software coding process. Integrated 12-bit, 29 kHz PWM generators for each channel enablesmooth, vivid color for LEDs, and eliminate audible noise.

The LP50xx device controls each LED output with a 12-bit PWM resolution at 29-kHzswitching frequency, which helps achieve a smooth dimming effect and eliminates audible noise. Theindependent color mixing and intensity control registers make the software coding straightforward.When targeting a fade-in, fade-out type breathing effect, the global R, G, B bank control reducesthe microcontroller loading significantly. The LP50xx device also implements a PWM phase-shiftingfunction to help reduce the input power budget when LEDs turn on simultaneously.

The LP50xx device implements an automatic power-saving mode to achieve ultralow quiescentcurrent. When channels are all off for 30 ms, the device total power consumption is down to 10 µA,which makes the LP50xx device a potential choice for battery-powered end equipment.