LP5018 18-Channel I2C Constant-Current RGB LED Driver | TI.com


18-Channel I2C Constant-Current RGB LED Driver



In smart homes and other human-machine-interaction applications for LED drivers, users want more performance for multi-channel RGB LED drivers. The goal is to get good user experiences with LED-animation effects such as flashing, breathing, and chasing.

The LP50xx device is an 18- or 24-channel constant-current-sink LED driver. The LP50xx device makes the user experience better in color mixing and intensity control. Persons at one time knew intensity control as brightness control. The user experience is better for live effects and for the work to write code. The optimization of performance for RGB LEDs makes it a possible alternative for human-machine-interaction applications.

The LP50xx device controls each LED output with a 12-bit PWM resolution at 29-kHz switching frequency, which helps achieve a smooth dimming effect and eliminates audible noise. The independent 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 reduces the microcontroller loading significantly. The LP50xx device also implements a PWM phase-shifting function to help reduce the input power budget when LEDs turn on simultaneously.

The LP50xx device implements an automatic power-saving mode to achieve ultralow quiescent current. 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-equipments.


  • Operating Voltage Range:
    • VCC Range: 2.7 V to 5.5 V
    • EN, SDA and SCL Pins Compatible With 1.8-V, 3.3-V, and 5-V Power Rails
    • Output Maximum Voltage: 6 V
  • 24 Constant-Current Sinks With High Precision
    • 25.5 mA Maximum per Channel With VCC in Full Range
    • 35 mA Maximum per Channel When VCC ≥ 3.3 V
    • Device-to-Device Error: ±7%; Channel-to-Channel Error: ±7%
  • Ultralow Quiescent Current:
    • Shutdown Mode: 1 µA (Max.) With EN Low
    • Power Saving Mode: 10 µA (Typ.) With EN High and All LEDs 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 LED Module
    • Optional Logarithmic- or Linear-Scale Brightness Control
    • Integrated 3-Phase PWM-Shifting Scheme
  • 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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Parametrics Compare all products in RGB & white LED drivers

Channels (#)
LED Current Per Channel (mA)
LED Configuration
LED (#)
Program Memory
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Iq (Typ) (mA)
Shutdown Current (Typ) (uA)
Operating Temperature Range (C)
LP5018 LP5024 TLC59116
18     24     16    
35     35     120    
Parallel     Parallel     Parallel
18     24      
2.7     2.7     3    
5.5     5.5     5.5    
2.7     2.7     -0.5    
5.5     5.5     20    
0.63     0.84     1.92    
0.01     0.01     25    
0.2     0.2      
Constant Current
Current Control
I2C Control
Power Save Mode    
Constant Current
Current Control
I2C Control
Power Save Mode    
Analog/PWM Mixed Dimming
Constant Current
Current Control
I2C Control    
-40 to 125     -40 to 85     -40 to 85    
32VQFN     32VQFN     28TSSOP