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LP5811 Synchronous Boost 4-Channel RGBW LED Driver with Autonomous Control

1 Features

•Operating voltage range:

–Input voltage (V

IN

) range: 0.5V to 5.5V

–1.8V minimum input voltage for start-up

–Logic pins compatible with 1.8V, 3.3V, and 5V

•High efficiency synchronous boost converter

–Output voltage (V

OUT

) range: 3V to 5.5V

–140mΩ (HS) / 60mΩ (LS) MOSFETs

–1.6A valley switching current limit

–95% efficiency at V

IN

= 4.2V, V

OUT

= 5.0V, I

OUT

= 300mA

–Pass-through mode when VIN > VOUT setting

–True disconnection between input and output

during shutdown

•4 constant current sinks with high precision:

–0.1mA to 51mA per current sink

–Device-to-device error: max ±5%

–Channel-to-channel error: max ±5%

–Ultra-low headroom voltage: 110mV (typ.) at

25.5mA; 210mV (typ.) at 51mA

–PWM phase shift configurable for each LED

•Ultra-low power consumption:

–Shutdown: I

SD

= 0.1μA (typical) when EN = Low

–Standby: I

STB

= 26μA (typical) when EN = High

and CHIP_EN = 0 (data retained)

–Active: I

NOR

= 0.45mA (typical) when LED

current = 25.5mA

•Analog dimming (current gain control)

–Global 1-bit Maximum Current (MC): 25.5mA or

51mA

–Individual 8-bit Dot Current (DC) setting

•PWM dimming up to audible-noise-free 24kHz

–Individual 8-bit PWM dimming resolution

–Linear or exponential dimming curves

•Autonomous animation engine control

•Individual LED dot open/short detection

•Integrated de-ghosting function

•1MHz (max.) I

2

C interface

•–40°C to 85°C operating temperature range

2 Applications

LED animation and indication for:

•Portable and wearable electronics - earbud and

charging case, E-cigarette, smart watch

•Gaming and home entertainment - smart speaker,

RGB mouse, VR headset, and controller

•Internet-of-Things (IOT) - E-tag, video doorbell

•Networkings - router, access point

•Industrial HMI - EV charger, factory automation

3 Description

The LP5811 is a synchronous boost 4-channel RGBW

LED driver with autonomous animation engine control.

The device is ideal to support battery-powered

applications with 0.5V to 5.5V input voltage range,

and it has ultra-low normal operation current with

0.4mA (typical) when illuminate LEDs.

The integrated synchronous boost converter

maintains excellent efficiency and keeps the

brightness of LEDs stable over a wide operating

voltage range. Output voltage can be selected for

different LED forward voltage from 3V to 5.5V with

0.1V step. The boost converter can power not only

the LEDs driven by the device itself, but also other

loads in the system. If the boost converter need to be

bypassed, VOUT is used as the power supply input

for the LED driver blocks.

Both analog dimming and PWM dimming methods are

adopted to achieve powerful dimming performance.

The output current of each LED can be adjusted

with 256 steps from 0.1mA to 25.5mA or 0.2mA to

51mA. The 8-bit PWM generator enables smooth

and audible-noise-free dimming control for LED

brightness.

The autonomous animation engine can significantly

reduce the real-time loading of controller. Each LED

can be configured through the related registers to

realize vivid and fancy lighting effects. The device

can generate 6MHz clock signal and use it for

synchronizing the lighting effects among multiple

devices.

Package Information

PART NUMBERPACKAGE

(1)

BODY SIZE (NOM)

LP5811

DSBGA (12)1.84mm × 1.43mm

WSON (12)3mm × 3mm

(1)Product Preview

LP5811

OUT0

OUT1

OUT2

SW

OUT3

22 uF

10 uF

1 uH

0.5 V - 5.5 V

GND

OFF

ON

VIN

EN

SCL

SDA

SYNC

VOUT

MCU

V

MCU

Red LED

Green LED

Blue LED

4.7k



4.7k



LED0

LED1

LED2

LED3

White LED

Simplified Schematic

LP5811

SNVSCC4C – OCTOBER 2023 – REVISED FEBRUARY 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Produktspecifikationer