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AAT2846_08 参数 Datasheet PDF下载

AAT2846_08图片预览
型号: AAT2846_08
PDF下载: 下载PDF文件 查看货源
内容描述: 高电流电荷泵,带有双LDO用于背光和闪光应用 [High Current Charge Pump with Dual LDO for Backlight and Flash Applications]
分类和应用:
文件页数/大小: 22 页 / 1412 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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PRODUCT DATASHEET  
AAT2846  
ChargePumpTM High Current Charge Pump with Dual LDO for Backlight and Flash Applications  
AS2Cwire Serial Interface Addressing  
35.0  
30.0  
ENS Rising  
25.0  
Address  
Edges  
Function  
20.0  
15.0  
10.0  
5.0  
0
1
2
3
4
5
17  
18  
19  
20  
21  
22  
Backlight Current BL1-BL6  
Main Backlight Current BL1-BL5  
Sub Backlight Current BL6  
Low Current Backlight  
Flash Current FL1, FL2  
Independent Flash On/Off Control  
Maximum Backlight Current  
(Main and Sub)  
Backlight Independent Control  
BL3-BL6 On/Off Control  
BL1/BL2 On/Off Control  
30mA (Full Scale)  
20mA (Full Scale)  
0.0  
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16  
12  
29  
Data Code  
15  
Sub-2  
Sub-3  
32  
19  
20  
Figure 2: Data Code for Address 0-2  
vs. Backlight Current Level.  
Table 1: AS2Cwire Serial Interface Addressing.  
The AAT2846 incorporates additional circuitry that opti-  
mizes performance for exceptionally low backlight cur-  
rent settings. A separate address is used to activate this  
circuitry. To program the low current settings with  
improved performance and efficiency, write to Address  
3. Unlike Addresses 0-3, which have current level set-  
tings according to Table 2 and Figure 2, Address 3 pos-  
sesses a separate set of current levels described by the  
Low Current Backlight settings found in Table 3.  
Backlight Current Control (Address 0-3)  
Use Addresses 0-3 to program all six backlight LED  
channels. All six backlight channels are programmed to  
the same current level by writing Address 0 followed by  
any Data between 1 and 16. To program only the main  
channels BL1 through BL5, use Address 1. Similarly, use  
Address 2 to independently program subchannel BL6  
only.  
Main Current  
On  
Sub Current  
On  
Current  
(µA)  
Data  
Data  
30mA Max (mA)  
20mA Max (mA)  
1
2
No  
No  
No  
No  
0
0
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
30.0  
27.9  
26.1  
24.2  
21.0  
19.2  
17.3  
15.0  
12.7  
10.9  
8.1  
20.0  
19.0  
17.8  
16.5  
14.3  
13.0  
11.8  
10.2  
8.5  
7.3  
5.4  
4.1  
2.9  
3
No  
No  
0
4
No  
No  
0
5
6
7
8
No  
No  
No  
No  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
No  
No  
No  
No  
Yes  
Yes  
Yes  
Yes  
95  
500  
950  
1900  
95  
500  
950  
1900  
95  
9
10  
11  
12  
13  
14  
15  
16  
6.2  
4.4  
3.5  
2.6  
500  
950  
1900  
2.2  
1.6  
0
0
Table 3: Data Code for Low-Level Backlight  
Current, Address 3, FS = 20mA range.  
Table 2: Data Code for Backlight Current Level,  
Address 0-2.  
w w w . a n a l o g i c t e c h . c o m  
2846.2008.03.1.1  
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