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AAT1231

更新时间： 2024-01-05 21:16:34
品牌 Logo 应用领域
ANALOGICTECH 转换器
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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AAT1231 技术参数

生命周期：Transferred包装说明：,
Reach Compliance Code：unknown风险等级：5.77
Base Number Matches：1

AAT1231 数据手册

 浏览型号AAT1231的Datasheet PDF文件第2页浏览型号AAT1231的Datasheet PDF文件第3页浏览型号AAT1231的Datasheet PDF文件第4页浏览型号AAT1231的Datasheet PDF文件第5页浏览型号AAT1231的Datasheet PDF文件第6页浏览型号AAT1231的Datasheet PDF文件第7页 
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  
SW  
C2  
2.2µF  
PGND  
OVP  
Li-Ion:  
VIN = 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)  
FB  
SEL  
AGND  
R1 (RBALLAST  
)
30.1Ω  
1231.2007.01.1.2  
1
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