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1 Features

1? 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

2 Applications

? Fun Lights and Indicator Lights

? LED Backlighting

? Haptic Feedback

? Programmable Current Source

3 Description

The LP5523 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 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).