AAT2845A中文资料Four-Channel Backlight Driver with Dual LDOs数据手册Skyworks规格书

描述 Description

The AAT2845A is a highly integrated power solution for single-cell lithium-ion-based LCD display applications. It includes a four-channel LED backlight driver and two integrated 200mA LDOs as additional power supplies for display and camera related chipsets.
The backlight driver is a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency. Each of the four channels is capable of driving up to 20mA per channel.
AnalogicTech's S²Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with 16 available settings down to 50µA. The low current mode supply current can be as low as 50µA to save power and maintain high efficiency.
Each LED output is equipped with built-in protection for short-circuit and auto-disable functions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA.
The AAT2845A is available in a Pb-free, thermally-enhanced 20-pin 3x4mm TQFN package.

特性 Features

·Input Voltage Range: 2.7V to 5.5V
·Four-Channel LED Driver:
·Tri-Mode Charge Pump
·Up to 20mA/Channel
·Easy Control with Single Wire Interface
·16 Current Levels
·Four Low Current Settings Down to 50µA
·Low IQ (50µA) for Low Current Mode
·>90% Peak Efficiency
·Dual 200mA LDOs
·Automatic Soft-Start
·Over-Temperature Protection
·Available in 3x4mm TQFN34-20 Package
·-40°C to +85°C Temperature Range

简介

AAT2845A属于集成电路（IC）的LED驱动器。由制造生产的AAT2845ALED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。