●The LP55231 is a 9-channel LED driver designed to produce lighting effects for mobile devices. A high-efficiency 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.
●For all available packages, see the orderable addendum at the end of the data sheet.
● 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
