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AAT1231ITP-T1

更新时间： 2024-02-22 23:49:04

品牌	Logo	应用领域
ANALOGICTECH		转换器稳压器开关式稳压器或控制器电源电路开关式控制器
页数	文件大小	规格书
27页	1554K
描述
Step-Up DC/DC Converters for White LED Backlight Applications

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技术参数
数据手册

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AAT1231ITP-T1 技术参数

生命周期：	Obsolete	包装说明：	SOJ,
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.82
Is Samacsys：	N	模拟集成电路 - 其他类型：	SWITCHING REGULATOR
控制模式：	CURRENT-MODE	最大输入电压：	5.5 V
最小输入电压：	2.7 V	标称输入电压：	3.6 V
JESD-30 代码：	R-PDSO-J12	长度：	3 mm
功能数量：	1	端子数量：	12
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOJ
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
座面最大高度：	1.1 mm	表面贴装：	YES
切换器配置：	BOOST	最大切换频率：	2000 kHz
温度等级：	INDUSTRIAL	端子形式：	J BEND
端子节距：	0.5 mm	端子位置：	DUAL
宽度：	2.4 mm	Base Number Matches：	1

AAT1231ITP-T1 数据手册

AAT1231/1231-1

Step-Up DC/DC Converters for

White LED Backlight Applications

™

SwitchReg

General Description

Features

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

ciency constant current boost converters capable of

24V maximum output voltage. Both devices are

ideal power solutions 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

Up to 82% Efficiency

The LED current is digitally controlled across a 6x

operating range using AnalogicTech’s Simple Serial

Control™ (S²Cwire™) interface. Programmability

across 26 discrete current steps provides high reso-

lution, 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 feed-

back voltage between two programmable ranges.

•

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

Selectable Feedback Voltage Ranges for

High Resolution Control of Load Current

Short-Circuit, Over-Voltage, and Over-

Temperature Protection

•

TheAAT1231 and theAAT1231-1 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

inductors and capacitors. Fully integrated control cir-

cuitry 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 leakage current, making the devices ideal-

ly suited for battery-powered applications.

•

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

TheAAT1231 and theAAT1231-1 are available in Pb-

free, thermally-enhanced 12-pin TSOPJW packages.

Typical Application

Up to 24V/

DS1

L = 2.2µH

50mA max

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

12kΩ

AAT1231/

1231-1

Enable/Set

Select

EN/SET

Capable of Driving

Six LEDs in Series

(see Applications Section)

SEL

AGND

R₁(R_BALLAST

)

30.1Ω

1231.2007.01.1.2

12 3 4 5 6 7...27

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