LP5018RSMR LED Driver: Datasheet, Alternatives, CAD Models

High-performance RGB LED drivers are required in smart homes and other applications that use human-machine interaction. Flashing, breathing, and chasing LED animation effects substantially enhance the user experience, and system noise must be kept to a minimum.

The LP5018RSMR  is a constant current sink LED driver with 18  or 24  channels. Pre-configuration streamlines the software coding process for the LP5018RSMR  device, which provides integrated color mixing and brightness control. For each channel, integrated 12  -bit, 29  kHz PWM generators provide smooth, vibrant color and reduce perceptible noise.

LED Lighting, Indicator Lights, and Fun Lights for:

• Smart Speaker (With Voice Assistant)

• Smart Home Appliances

• Video Doorbell

• Electronic Smart Lock

• Smoke and Heat Detector

• STB and DVR

• Smart Router

• Handheld Device

• 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 ≥ 3.3V

– 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 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

Symbol

Footprint

3D Models

1. PWM Control for Each Channel

The high-resolution PWM generator is solely utilized for intensity control in most traditional LED drivers, which are built for single-color LEDs. To obtain the desired look using RGB LEDs, however, both color mixing and intensity control must be handled. Users must manage color mixing and intensity control simultaneously with a single PWM register in the old solution. When utilizing a logarithmic scale control, several undesirable effects occur restricted dimming steps, difficult software design, and color distortion.

 2. LED Bank Control

Most LED animation effects, such as blinking and breathing, use the same illumination pattern across all RGB LEDs,  Instead of operating each LED individually, which consumes a lot of microcontroller resources, the LP5018RSMR  device offers a simple coding solution called LED bank control.

3. Current Range Setting 

A single external resistor, RIREF, controls the constant-current value (ISET) of all 24 channels. The output current is close to zero when the IREF  pin is floating. The LP5018RSMR  device provides internal current-limit protection when the IREF  pin is shorted to GND, and the output-channel maximum current is limited to ILIM.

4. Automatic Power-Save Mode

When all of the LED outputs are turned off, the LP5018RSMR  device can automatically enter power-saving mode, cutting idle current consumption to 10 A. (typical). When register bit Power Save EN = 1 (default) and all LEDs are off for more than 30 milliseconds, an automatic power-saving mode is enabled. In power-saving mode, almost all analog blocks are turned off. The LP5018RSMR  device returns to NORMAL mode if any I2C commands are sent to it.

5. Protection Features-Thermal Shutdown

The thermal shutdown feature in the LP5018RSMR  gadget protects the device from harm caused by overheating. The device enters shutdown mode when the junction temperature reaches 160°C (typical). When the junction temperature of the LP5018RSMR  device is dropped to 145°C, the device releases thermal shutdown  (typical).