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AAT1142 参数 Datasheet PDF下载

AAT1142图片预览
型号: AAT1142
PDF下载: 下载PDF文件 查看货源
内容描述: 800毫安电压缩放降压型转换器 [800mA Voltage-Scaling Step-Down Converter]
分类和应用: 转换器
文件页数/大小: 22 页 / 975 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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AAT1142  
800mA Voltage-Scaling Step-Down Converter  
LX  
L1  
2.2µH  
U1  
VIN  
1
2
3
4
5
6
12  
11  
10  
9
VOUT  
VIN  
LX  
VIN  
C4  
(optional)  
0.1µF  
C2  
10µF  
PGND  
AGND  
C1  
C3  
4.7µF  
(optional)  
10µF  
MODE/SYNC AGND  
SDA  
AGND  
AGND  
FB  
1
2
R1  
0
8
VIN  
VIN  
SCL  
JP1  
7
EN/SET  
R5  
1.8K  
R4  
1.8K  
(optional)  
R2  
(optional)  
AAT1142  
TSOPJW-12  
VIN  
R3  
10K  
SDA  
SCL  
1
2
1
2
3
JP2  
JP3  
U1 AAT1142 TSOPJW-12  
L1 CDRH2D14/2R2  
C1 4.7µF 10V 0805 X5R  
C2 10µF 10V 0805 X5R  
C3 10µF optional  
C4 0.1µF optional  
R1 0Ω 0603  
R2 optional 0603  
R3 10K 0603  
R4, R5 1.8K 0603  
Figure 1: AAT1142 Evaluation Board Schematic.  
put. To ensure a disable event, the EN/SET pulse  
width must be greater than the latch time (500µs  
maximum).  
Applications Information  
The AAT1142 output voltage may be programmed  
from 0.6V to 2.0V through I2C or S2Cwire serial  
interface. When using I2C or S2Cwire, the output  
voltage can be programmed across the entire out-  
put voltage range or in increments as small as  
±50mV (see Figure 2).  
The I2C serial interface requires a master to initiate  
all the communications with slave devices. The I2C  
protocol is a bidirectional bus allowing both read and  
write actions to take place; while the AAT1142 is a  
slave device and only supports the write protocol.  
The AAT1142 is a receiver-only (or write-only)  
slave device and the Read / Write (R/W) bit is set  
low. The AAT1142 address is preset to 0x14 (Hex).  
I2C Serial Interface  
The AAT1142 is compatible with the I2C interface,  
which is a widely used two-line serial interface.  
The I2C two-wire communications bus consists of  
SDA and SCL lines. SDA provides data, while SCL  
provides clock input. SDA data consists of an  
address bit sequence followed by a data bit  
sequence. SDA data transfer is synchronized to  
SCL rising clock edges.  
I2C START and STOP Conditions  
START and STOP conditions are initialized by the  
I2C bus master. The master determines the START  
(beginning) and STOP (end) of a transfer with the  
slave device. Prior to initiating a START or after  
STOP, both the SDA and SCL lines are in bus-free  
mode. Bus-free mode is when SDA and SCL are  
both in the high state (see Figure 3).  
When using the I2C interface, EN/SET is pulled  
high to enable the output or low to disable the out-  
12  
1142.2006.07.1.0  
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