Product details


Number of channels (#) 30 LED current per channel (mA) 35 LED configuration Parallel Program memory No Programmable ramp control No Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Iout (Max) (A) 1.05 Features Constant Current, Current Control, I2C Control, Power Save Mode Iq (Typ) (mA) 0.01 Shutdown current (Typ) (uA) 1 Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other RGB LED drivers

Package | Pins | Size

VQFN (RJV) 46 30 mm² 6 x 5 open-in-new Find other RGB LED drivers


  • 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
  • 36 Constant-Current Sinks With High Precision
    • 25.5 mA Maximum per Channel When VCC in Full Range
    • 35 mA Maximum per Channel When VCC ≥ 3.3 V
    • Device-to-Device Error ±5%; Channel-to-Channel Error ±5%
  • Ultralow Quiescent Current:
    • Shutdown Mode: 1 µA (Maximum) When EN Low
    • Power Saving Mode: 12 µA (Maximum) When 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-Shifting PWM 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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Efficient and high-performance LED response effects, such as blinking, breathing, and chasing, are critical to improving end-user experience in many human machine interface (HMI) applications.

The LP503x device is a 30- or 36-channel constant-current-sink LED driver. The LP503x has a 29 kHz, 12-Bit PWM generator for each channel, as well as channel/module independent color mixing and intensity control, formerly called brightness control registers to enable vivid LED effects with zero audible noise. Users can benefit from the device’s ultra-low shutdown Iq Power Saving Mode, while designers will appreciate the incredibly straightforward software coding of the LP503x’s three programmable R G B banks.

The LP503x device controls each LED output with a 12-bit PWM resolution at 29-kHz switching frequency. This control helps get an intensity that decreases smoothly and stops audible noise. Having different color-mixing and intensity-control registers makes writing the software code straightforward. When targeting fade-in, fade-out type breathing effects, the global R, G, B bank control reduces the microcontroller loading significantly. The LP503x device also implements a PWM phase-shifting function to help reduce the input power budget when LEDs turn on simultaneously.

The LP503x device has an automatic power-saving mode to get the ultra-low quiescent current. When channels are all off for 30 ms, the device total power consumption is down to 10 µA, making the LP503x device a possible alternative for battery-powered end equipment.

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Technical documentation

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Type Title Date
* Data sheet LP503x 36-, 30-Channel 12-Bit PWM Ultra-low Quiescent Current I2C RGB LED Drivers datasheet (Rev. B) Jan. 21, 2019
White paper Common LED Functions and LED Driver Design Considerations Sep. 21, 2020
Application note System Design Guidelines for Full-Color RGB LED Matrix Based on LP50xx Device Apr. 08, 2020
Application note How to Select a RGB LED Driver Aug. 08, 2019
White paper Smart speaker fundamentals: Weighing the many design trade-offs Feb. 25, 2019
White paper 智慧型喇叭基本說明: 衡量各種設計優缺點 Feb. 08, 2019
White paper 스마트 스피커 기본 사항: 설계 장단점 따져 보기 Feb. 08, 2019
Technical article Using an RGBW LED driver to elevate LED human-machine interface designs Nov. 27, 2018
Technical article Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical article LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical article Take better selfies with innovative LED flashes Nov. 18, 2014

Design & development

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Hardware development

document-generic User guide
What you need to get started: 

Step 1: Order the hardware 

Step 2: Download and install the LP50EVM user GUI and review the EVM users guide
  • Our LP50EVM GUI is used with the LP50EVM to evaluate the features of the LP50xx device.

Step 3: If you plan to use a MCU based system software, please see this e2e™ post (...)
  • Easy to Verify the LP5036 Device Full Function
  • Easy to Confirm the LP5036 Device Porfermance with the RBG LED Modules
  • Easy to Design the Fashion Lighting Pattern with the Demo Effect

Software development

SLVC713A.ZIP (86539 KB)

Design tools & simulation

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  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
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