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ADP3309ART-2.85-R7 PDF预览

ADP3309ART-2.85-R7

更新时间： 2024-01-29 17:43:59
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
12页 348K
描述
anyCAP 100 mA Low Dropout Linear Regulator

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ADP3309ART-2.85-R7 数据手册

 浏览型号ADP3309ART-2.85-R7的Datasheet PDF文件第6页浏览型号ADP3309ART-2.85-R7的Datasheet PDF文件第7页浏览型号ADP3309ART-2.85-R7的Datasheet PDF文件第8页浏览型号ADP3309ART-2.85-R7的Datasheet PDF文件第9页浏览型号ADP3309ART-2.85-R7的Datasheet PDF文件第10页浏览型号ADP3309ART-2.85-R7的Datasheet PDF文件第12页 
ADP3309  
APPLICATION CIRCUITS  
MJE253*  
V
= 3.3V @ 1A  
CROSSOVER SWITCH  
V
= 4V TO 8V  
OUT  
IN  
C1  
R1  
47µF  
50Ω  
The circuit in Figure 23 shows that two ADP3309s can be used  
to form a mixed supply voltage system. The output switches  
between two different levels selected by an external digital  
input. Output voltages can be any combination of voltages from  
the Ordering Guide of the data sheet.  
IN  
OUT  
+
C2  
10µF  
ADP3309-3.3  
SD  
ERR  
GND  
V = 2.7V/3.3V  
OUT  
V
= 4V TO 12V  
IN  
OUT  
IN  
OUTPUT SELECT  
ADP3309-2.7  
*AAVID531002 HEAT SINK IS USED  
4V  
0V  
Figure 24. Higher Output Current Linear Regulator  
SD  
GND  
CONSTANT DROPOUT POST REGULATOR  
IN  
OUT  
The circuit in Figure 25 provides high precision with low  
dropout for any regulated output voltage. It significantly  
reduces the ripple from a switching regulator while providing a  
constant dropout voltage, which limits the power dissipation of  
the LDO to 30 mW. The ADP3000 used in this circuit is a  
switching regulator in the step-up configuration.  
+
+
C1  
1µF  
C2  
0.47µF  
ADP3309-3.3  
SD  
GND  
Figure 23. Crossover Switch  
HIGHER OUTPUT CURRENT  
The ADP3309 can source up to 100 mA without any heat sink  
or pass transistor. If higher current is needed, an appropriate  
pass transistor can be used, as in Figure 24, to increase the  
output current to 1 A.  
L1  
6.8µF  
D1  
1N5817  
ADP3309-3.3  
V
= 3.3V @ 100mA  
V
= 2.5V TO 3.5V  
IN  
OUT  
OUT  
IN  
C1  
100µF  
10V  
SD  
R1  
120Ω  
R2  
30.1kΩ  
1%  
C2  
100µF  
10V  
GND  
+
C3  
2.2µF  
I
V
LIM  
IN  
Q2  
2N3906  
SW1  
Q1  
2N3906  
ADP3000-ADJ  
FB  
R3  
124kΩ  
1%  
R4  
274kΩ  
GND  
SW2  
Figure 25. Constant Dropout Post Regulator  
Rev. C | Page 11 of 12  
 
 
 
 
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