AAT1271中文资料1.5A Step-Up Current Regulator for Flash LEDs数据手册Skyworks规格书

描述 Description

The AAT1271 is a high-efficiency, high-current boost converter capable of 1.5A typical output current. It is an ideal power solution for LED photo flash applications in all single cell Li-ion powered products.
The AAT1271 maintains output current regulation by switching the internal high-side and low-side switch transistors. The transistor switches are pulse-width modulated at a fixed frequency of 2MHz. The high switching frequency allows the use of a small inductor and output capacitor, making the AAT1271 ideally suited for small battery-powered applications.
AnalogicTech’s proprietary AS²Cwire™ (Advanced Simple Serial Control™) serial digital interface is used to enable, disable, configure, and program the operation of the AAT1271. Using the AS²Cwire interface, the movie-mode current level for each LED, the safety timer delay, and the flash-to-movie-mode current ratio can be programmed to one of 16 levels. In addition, the single-wire serial protocol sets output channel control. The AAT1271 also includes a separate Flash Enable input to initiate both the flash operation and the default timer which can be used either to terminate a flash event at the end of a user-programmed delay or as a safety feature. Also included is a Flash Inhibit pin which reduces the flash current to movie-mode levels during high battery demand.
The maximum flash and movie-mode current is set by one external resistor where the ratio of Flash to Movie-mode current is set at approximately 7.3:1. One or two LEDs can be connected to the AAT1271, where in the case of two LEDs the output current is matched between each diode.
The AAT1271 contains a thermal management system to protect the device in the event of an output short-circuit condition. Built-in circuitry prevents excessive inrush current during start-up. The shutdown feature reduces quiescent current to less than 1.0µA.
The AAT1271 is available in a Pb-free, thermally-enhanced 14-pin 3x3mm TDFN package.

特性 Features

·VIN Range: 2.7V to 5.5V
·Dual Channel Output
·Up to 1.5A Regulated Output Current (750mA per channel)
·Up to 85% Efficiency with Small Inductor (1µH)
·2 MHz Switching Frequency
·Separate Flash Enable
·Separate Flash Inhibit
·User-Programmable Safety Timer
·Single Resistor Sets Flash and Movie Mode Current
·AS²Cwire Single Wire Programming:
·Movie Mode Current
·Flash/Movie Mode Current Ratio
·Movie Mode Output Configuration
·Flash Safety Timer
·True Load Disconnect
·Input Current Limit
·Over-Voltage (Open LED, Open Circuit), Short Circuit, and Over-Temperature Protection
·Shutdown Current < 1.0µA
·14-pin TDFN 3x3 mm Package
·-40°C to +85°C Temperature Range

简介

AAT1271属于集成电路（IC）的LED驱动器。由制造生产的AAT1271LED 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。