Datasheet > AAT1270_08

AAT1270_08

更新时间： 2024-01-02 07:40:34

品牌	Logo	应用领域
ANALOGICTECH		调节器闪光灯
页数	文件大小	规格书
18页	561K
描述
1A Step-Up Current Regulator for Flash LEDs

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中文翻译

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AAT1270_08 数据手册

PRODUCT DATASHEET

AAT1270

SwitchReg^TM

1A Step-Up Current Regulator for Flash LEDs

General Description

Features

The AAT1270 is a high-efficiency, high-current boost con-

verter capable of 1A maximum output current. It is an ideal

power solution for LED photo flash applications in all single-

cell Lithium-ion / polymer battery operated products.

• Input Voltage Range: 2.7V to 5.5V

• Dual Channel Output

Up to 1A Regulated Output Current (0.5A per

▪

Channel)

• Up to 85% Efficiency with Small Magnetics

• 2 MHz Switching Frequency

• Separate Flash Enable Input

• Separate Flash Inhibit Input

• Single Resistor Sets Flash and Movie Mode Current

The AAT1270 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 AAT1270 ideally suited

for small battery-powered applications.

Fixed Flash-to-Movie Mode Current Ratio

▪

• 16-Level Movie Mode Current via S²Cwire™

• User-Programmable Safety Timer

• True Load Disconnect

AnalogicTech’s proprietary S²Cwire™ (Simple Serial

Control™) serial digital interface is used to enable, dis-

able and set the movie mode current level for the flash

LEDs to one of 16 levels. The AAT1270 also includes a

separate Flash Enable input to initiate both flash/strobe

operation and the default timer, which can be used to

terminate a flash event after a user-programmed delay

or as a safety feature. A Flash Inhibit pin is also includ-

ed which reduces flash current to movie mode level dur-

ing high battery demand.

• Input Current Limit

• Over-Voltage (Open LED, Open Circuit), Short-Circuit,

and Over-Temperature Protection

• Shutdown Current: < 1.0μA

• Small Inductor Solution: 1μH (0.9mm in height)

• 14-pin STDFN 3x3 Package

• -40 to +85°C Temperature Range

Applications

The maximum flash and movie mode current is set by one

external resistor; the ratio between flash and movie mode

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

be connected to the AAT1270; when two LEDs are used,

the output current is matched between each diode.

• Camcorder Video Light (Torch Light)

• Cellphones / Smartphones

• Digital Still Cameras (DSC)

• LED Photo Flash Light (Strobe Light)

• Mobile Handsets

The AAT1270 contains over-voltage protection and a

thermal management system to protect the device in the

event of an output open-circuit and short-circuit condi-

tion respectively. Built-in circuitry prevents excessive

inrush current during start-up. The shutdown feature

reduces quiescent current to less than 1.0μA.

• MP3 Players

• PDAs and Notebook PCs

The AAT1270 is available in a Pb-free, thermally-enhanced

14-pin 3x3mm STDFN package.

Typical Application

1μH

Flash LEDs

Lumiled LXCL-PWF1 or equivalent

OUT

C_IN

2.2μF

V_BATTERY

AAT1270

C_OUT

2.2μF

Movie Mode

EN/SET

FLEN

Enable and Set

Flash Enable

Flash Inhibit

FLOUTA

FLOUTB

FLINH

RSET

C_T

47nF

GND AGND PGND FLGND

R_SET

162kΩ

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

1270.2008.07.1.5

12 3 4 5 6 7...18

中文翻译

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与AAT1270_08相关器件

型号	品牌	获取价格	描述	数据表
AAT1270IFO-T1	ANALOGICTECH	获取价格	1A Step-Up Current Regulator for Flash LEDs
AAT1271	ANALOGICTECH	获取价格	1.5A Step-Up Current Regulator for Flash LEDs
AAT1271A	ANALOGICTECH	获取价格	1.5A Step-Up Current Regulator for Flash LEDs
AAT1271AIWO-T1	ANALOGICTECH	获取价格	1.5A Step-Up Current Regulator for Flash LEDs
AAT1271IWO-T1	ANALOGICTECH	获取价格	1.5A Step-Up Current Regulator for Flash LEDs
AAT1272IWO-T1	ANALOGICTECH	获取价格	Switching Regulator/Controller,
AAT1274	SKYWORKS	获取价格	1.5A Single Flash LED Driver IC
AAT1274IWO	SKYWORKS	获取价格	1.5A Single Flash LED Driver IC
AAT1275	ANALOGICTECH	获取价格	Boost Converter with USB Power Switch
AAT1275_08	ANALOGICTECH	获取价格	Boost Converter with USB Power Switch

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