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LP2951CN-5.0 参数 Datasheet PDF下载

LP2951CN-5.0图片预览
型号: LP2951CN-5.0
PDF下载: 下载PDF文件 查看货源
内容描述: [Fixed/Adjustable Positive LDO Regulator, 1.25V Min, 29V Max, 0.45V Dropout, PDIP8, PLASTIC, DIP-8]
分类和应用: 光电二极管输出元件调节器
文件页数/大小: 16 页 / 251 K
品牌: MOTOROLA [ MOTOROLA ]
 浏览型号LP2951CN-5.0的Datasheet PDF文件第7页浏览型号LP2951CN-5.0的Datasheet PDF文件第8页浏览型号LP2951CN-5.0的Datasheet PDF文件第9页浏览型号LP2951CN-5.0的Datasheet PDF文件第10页浏览型号LP2951CN-5.0的Datasheet PDF文件第12页浏览型号LP2951CN-5.0的Datasheet PDF文件第13页浏览型号LP2951CN-5.0的Datasheet PDF文件第14页浏览型号LP2951CN-5.0的Datasheet PDF文件第15页  
LP2950 LP2951  
Figure 22. Regulator with Early Warning and Auxiliary Output  
+V  
in  
8
V
D2  
in  
1
2
Memory  
V+  
5
3
V
Error  
out  
D1  
1.0 µF  
20  
3.6 V  
NiCad  
SNS  
LP2951CN  
#1  
6
NC  
SD  
V
T
O
Gnd  
4
FB  
7
Early Warning  
Reset  
27 k  
All diodes are 1N4148.  
D3  
Early Warning flag on low input voltage.  
µP  
2.7 M  
Main output latches off at lower input  
voltages.  
D4  
V
DD  
Q1  
2N3906  
8
Battery backup on auxiliary output.  
330 k  
V
in  
1
2
5
3
Operation: Regulator #1’s V  
programmed one diode drop above 5.0 V.  
is  
out  
V
Error  
out  
Main  
Output  
Its error flag becomes active when V < 5.7  
V. When V drops below 5.3 V, the error  
in  
flag of regulator #2 becomes active and via  
in  
SNS  
LP2951CN  
#2  
1.0 µF  
Q1 latches the main output “off”. When V  
6
in  
SD  
V
T
O
again exceeds 5.7 V, regulator #1 is back in  
regulation and the early warning signal  
rises, unlatching regulator #2 via D3.  
Gnd  
4
FB  
7
Figure 23. 2.0 A Low Dropout Regulator  
+V  
in  
Current Limit  
Section  
0.05  
470  
680  
2N3906  
1000 µF  
2N3906  
MJE2955  
.33 µF  
10 k  
4.7 M  
8
V
in  
1
2
Error  
Flag  
5
3
V
Error  
out  
V
@ 2.0 A  
NC  
NC  
47  
SNS  
out  
LP2951CN  
220  
6
4.7  
Tant  
µF  
SD  
V
T
O
100 µF  
R1  
Gnd  
4
FB  
20 k  
.01 µF  
7
R2  
0.033 µF  
V
= 1.25V (1.0 + R1/R2)  
out  
For 5.0 V output, use internal resistors. Wire Pin 6 to 7,  
and wire Pin 2 to +V Bus.  
out  
11  
MOTOROLA ANALOG IC DEVICE DATA