描述 Description

The LP5523 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 LP5523 maintains excellent efficiency over a wide operating range by autonomously selecting the best charge-pump gain based on LED forward voltage requirements. The LP5523 is able to automatically enter power-save mode when LED outputs are not active, thus lowering idle current consumption down to 10 μA (typical). The LP5523 has an I2C-compatible control interface with four pin selectable addresses. The device has a flexible general purpose output (GPO), which can be used as a digital control pin for other devices. 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 LP5523 devices. The device requires only four small, low-cost ceramic capacitors. The LP5523 is available in a tiny 25-pin DSBGA package (0.4-mm pitch). For all available packages, see the orderable addendum at the end of the data sheet.

特性 Features

? Three Independent Program Execution Engines, Nine 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 and 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