1 Features

1• 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

2 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

3 Description

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 constantcurrent-

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.