1 Features

1• Three Independent Program Execution Engines, 9

Programmable Outputs With 25.5-mA Full-Scale

Current, 8-Bit Current Setting Resolution and

12-Bit PWM Control Resolution

• Adaptive High-Efficiency 1×/1.5× Fractional

Charge Pump - Efficiency up to 94%

• LED Drive Efficiency Up to 93%

• Charge Pump With Soft Start

• Overcurrent and Short-Circuit Protection

• Built-in LED Test

• 200-nA Typical Standby Current

• Automatic Power Save Mode; IVDD = 10 μA

(Typical)

• Two-Wire I2C-Compatible Control Interface

• Flexible Instruction Set

• Large SRAM Program Memory

• Small Application Circuit

• Source (High-Side) Drivers

• Architecture Supports Color Control

2 Applications

• Fun Lights and Indicator Lights

• LED Backlighting

• Haptic Feedback

• Programmable Current Source

• Fire Notification

• Electronic Thermostats

• Electronic Locks

• Robotics

• Intruder Notification

• Light Switches and Dimmers

• Gaming and Smart Headphones

• Speakers

3 Description

The LP55231 is a 9-channel LED driver designed to

produce lighting effects for mobile devices. A highefficiency

charge pump enables LED driving over full

Li-Ion battery voltage range. The device is equipped

with an internal program memory, which allows

operation without processor control.

The LP55231 has an I2C-compatible control interface

with four pin-selectable addresses. The INT pin can

be used to notify processor when a lighting sequence

has ended (interrupt function). Also, the device has a

trigger input interface, which allows synchronization,

for example, between multiple LP55231 devices.

Excellent efficiency is maintained over a wide

operating range by autonomously selecting the best

charge pump gain based on LED forward voltage

requirements. The device is able to automatically

enter power-save mode when LED outputs are not

active, thus lowering idle current consumption down

to 10 μA (typical). Only four small and low-cost

ceramic capacitors are required.