Datasheet > AAT1272IWO-T1

AAT1272IWO-T1

更新时间： 2024-02-09 13:14:28

品牌	Logo	应用领域
ANALOGICTECH		/
页数	文件大小	规格书
20页	2644K
描述
Switching Regulator/Controller,

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AAT1272IWO-T1 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.83
接口集成电路类型：	LED DISPLAY DRIVER	峰值回流温度（摄氏度）：	NOT SPECIFIED
处于峰值回流温度下的最长时间：	NOT SPECIFIED	Base Number Matches：	1

AAT1272IWO-T1 数据手册

PRODUCT DATASHEET

AAT1272

SwitchReg

1.5A Step-Up Current Regulator for Flash LEDs

General Description

Features

•

The AAT1272 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.

V_INRange: 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

User-Programmable Safety Timer

Single Resistor Sets Flash and Movie Mode Current

Two Wire, I²C Compliant Serial Interface

The AAT1272 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 AAT1272 ideally suited

for small battery-powered applications.

Fast, 400kHz Serial Transfer Rate

16 Level Movie-mode Current

Flash/Movie-mode

Current Output Channel Control

▪

An industry-standard I²C serial digital input is used to

enable, disable and set the movie-mode current for each

flash LED with up to 16 movie-mode settings. The

AAT1272 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.

The maximum flash and movie-mode current is set by one

external resistor; the ratio of Flash to Movie-mode current

is set at approximately 7.3:1. One or two LEDs can be

connected to the AAT1272; in the case of two LEDs the

output current is matched between each diode.

▪

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

•

Applications

The AAT1272 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.

•

Digital Still Cameras (DSCs)

LED Photo Flash/Torch

Mobile Handsets

MP3 Players

PDAs and Notebook PCs

The AAT1272 is available in a Pb-free, thermally-enhanced

14-pin 3x3mm TDFN package.

w w w . a n a l o g i c t e c h . c o m

1272.2009.04.1.2

12 3 4 5 6 7...20

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