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.