MCU

R3

G3

B3

R4

G4

B4

IRGB

IRT

ASE2

AUDIO

INPUTS

LP55281

SW

BATTERY

FB

VDDA

VREF

D1

VDD2

VDD1

GNDs

SCK/SCL

SI/A0

SS/SDA

SO

IF_SEL

VDDIO

RGB3

RGB4

RRT

RRGB

COUT

10 P

F

IMAX = 300...400 mA

VOUT = 4...5.3V

CVDD

100 nF

Lboost

CIN

10 P

F

CVDDA

1 é

F

CREF

100 nF

CVDDIO

100 nF

ALED

RGB1

RGB2

R1

G1

B1

R2

G2

B2

ASE1

4.7 P

H

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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.

LP55281

SNVS458D – JUNE 2007 – REVISED OCTOBER 2016

LP55281 12-Channel RGB/White-LED Drive With SPI, I2C Interface

1

1 Features

1

•

Audio Synchronization for a Single Fun-Light LED

•

Four PWM Controlled RGB LED Drivers

•

High-Efficiency Boost DC-DC Converter

•

SPI or I2C-Compatible Interface

•

Two Addresses in I2C-Compatible Interface

•

LED Connectivity Test Through the Serial

Interface

2 Applications

•

Cellular Phones

•

PDAs, MP3 Players

3 Description

The LP55281 device is a quadruple RGB LED driver

for handheld devices. It can drive 4 RGB LED sets

and a single fun-light LED. The boost DC-DC

converter

drives

high

current

loads

with

high

efficiency. The RGB driver can drive individual color

LEDs or RGB LEDs powered from boost output or

external supply. Built-in audio synchronization feature

allows user to synchronize the fun-light LED to audio

inputs. The flexible SPI or I2C interface allows easy

control of LP55281. A small YZR0036 or YPG0036

package, together with minimum number of external

components, is a best fit for handheld devices. The

LP55281 also has an LED test feature, which can be

used, for example, in production for checking the LED

connections.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LP55281

DSBGA (36)

2.982 mm × 2.982 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application