LP5523TMX/NOPB屬于集成電路（IC）的LED驅動器。由美國德州儀器公司制造生產的LP5523TMX/NOPBLED 驅動器器件屬于 LED 驅動器電源管理集成電路 (PMIC) 系列，可通過標稱固定電壓的電源為負載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調節(jié)的類似產品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通?？蓪ζ骷ぷ鼽c進行外部控制，可在照明應用中用于實現調光功能。

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).