Datasheet > AAT1231_08

AAT1231_08

更新时间： 2024-11-19 04:30:31

品牌	Logo	应用领域
ANALOGICTECH		转换器
页数	文件大小	规格书
27页	1684K
描述
Step-Up DC/DC Converters for White LED Backlight Applications

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PRODUCT DATASHEET

AAT1231

SwitchReg^TM

Step-Up DC/DC Converters for White LED Backlight Applications

General Description

Features

The AAT1231/1231-1 are high frequency, high efficiency

constant current boost converters capable of 24V maxi-

mum output voltage. Both devices are ideal power solu-

tions for backlight applications with up to six white LEDs

in series or up to twelve white LEDs in a parallel/series

configuration. The input voltage is 2.7V to 5.5V for single-

cell lithium-ion/polymer (Li-ion) based portable devices.

• Input Voltage Range: 2.7V to 5.5V

• Maximum Continuous Output 24V @ 50mA

• Drives 6 LEDs in Series, 12 LEDs in Parallel / Series

Configuration

Constant LED Current with 6% Accuracy

▪

• Digital Control with S²Cwire Single Wire Interface

26 Discrete Steps

No PWM Control Required

No Additional Circuitry

▪

The LED current is digitally controlled across a 6x oper-

ating range using AnalogicTech’s Simple Serial Control™

(S²Cwire™) interface. Programmability across 26 dis-

crete current steps provides high resolution, low noise,

flicker-free, constant LED outputs. In programming

AAT1231 operation, LED brightness increases based on

the data received at the EN/SET pin. In programming

AAT1231-1 operation, LED brightness decreases based

on the data received at the EN/SET pin. The SEL logic pin

changes the feedback voltage between two program-

mable ranges.

▪

• Up to 82% Efficiency

• Up to 2MHz Switching Frequency Allows Small External

Chip Inductor and Capacitors

• Hysteretic Control

No External Compensation Components

Excellent Load Transient Response

High Efficiency at Light Loads

▪

• Integrated Soft Start with No External Capacitor

• True Load Disconnect Guarantees <1.0μA Shutdown

Current

The AAT1231 and the AAT1231-1 feature high current

limit and fast, stable transitions for stepped or pulsed

current applications. The high switching frequency (up to

2MHz) provides fast response and allows the use of

ultra-small external components, including chip induc-

tors and capacitors. Fully integrated control circuitry

simplifies design and reduces total solution size. The

AAT1231 and the AAT1231-1 offer a true load disconnect

feature which isolates the load from the power source

while in the OFF or disabled state. This eliminates leak-

age current, making the devices ideally suited for bat-

tery-powered applications.

• SelectableFeedbackVoltageRangesforHighResolution

Control of Load Current

• Short-Circuit, Over-Voltage, and Over-Temperature

Protection

• 12-Pin TSOPJW Package

• -40°C to +85°C Temperature Range

Applications

• Digital Still Cameras (DSCs)

• Mobile Handsets

• MP3 Players

• PDAs and Notebook PCs

• White LED Drivers

The AAT1231 and the AAT1231-1 are available in Pb-free,

thermally-enhanced 12-pin TSOPJW packages.

Typical Application

Up to 24V/

50mA max

DS1

L = 2.2μH

LIN

PVIN

VIN

OSRAM

LW M678

C₁

2.2μF

R₂

226kΩ

C₂

2.2μF

PGND

OVP

Li-Ion:

V_IN= 2.7V to 4.2V

R₃

AAT1231/

1231-1

EN/SET

12kΩ

Enable/Set

Select

Capable of Driving

Six LEDs in Series

SEL

(see Applications Section)

AGND

₁(R_BALLAST

)

30.1Ω

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

1231.2008.06.1.5

12 3 4 5 6 7...27

中文翻译

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与AAT1231_08相关器件

型号	品牌	获取价格	描述	数据表
AAT1231ITP	ANALOGICTECH	获取价格	Step-Up DC/DC Converters for White LED Backlight Applications
AAT1231ITP-1	ANALOGICTECH	获取价格	Step-Up DC/DC Converters for White LED Backlight Applications
AAT1231ITP-1-T1	ANALOGICTECH	获取价格	Step-Up DC/DC Converters for White LED Backlight Applications
AAT1231ITP-T1	ANALOGICTECH	获取价格	Step-Up DC/DC Converters for White LED Backlight Applications
AAT1232	ANALOGICTECH	获取价格	24V 100mA Step-Up Converter
AAT1232_07	ANALOGICTECH	获取价格	24V 100mA Step-Up Converter
AAT1232IRN-T1	ANALOGICTECH	获取价格	24V 100mA Step-Up Converter
AAT1232ITP-T1	ANALOGICTECH	获取价格	24V 100mA Step-Up Converter
AAT1235	ANALOGICTECH	获取价格	High Efficiency White LED Drivers for Backlight and Keypad
AAT1235IRN-T1	ANALOGICTECH	获取价格	High Efficiency White LED Drivers for Backlight and Keypad

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