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LP2951CD3.3 Datasheet(PDF) 12 Page - ON Semiconductor

Part # LP2951CD3.3
Description  100 mA, Low Power Low Dropout Voltage Regulator
PDF  22 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LP2951CD3.3 Datasheet(HTML) 12 Page - ON Semiconductor

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LP2950, LP2951, NCV2951
http://onsemi.com
12
330 k
Figure 25. Regulator with Early Warning and Auxiliary Output
+Vin
Memory
V+
1.0
mF
20
5
3
Error
SD
GND
FB
47
6
VO T
SNS
2
Vout
Vin
8
1
LP2951CN
#1
1.0
mF
5
3
Error
SD
GND
FB
47
6
VO T
SNS
2
Vout
Vin
8
1
LP2951CN
#2
NC
Reset
VDD
mP
Early Warning
All diodes are 1N4148.
Early Warning flag on low input voltage.
Main output latches off at lower input voltages.
Battery backup on auxiliary output.
Operation: Regulator #1’s Vout is programmed one
diode drop above 5.0 V. Its error flag becomes active
when Vin < 5.7 V. When Vin drops below 5.3 V, the
error flag of regulator #2 becomes active and via Q1
latches the main output “off”. When Vin again exceeds
5.7 V, regulator #1 is back in regulation and the early
warning signal rises, unlatching regulator #2 via D3.
D4
2.7 M
Q1
2N3906
D2
D1
D3
27 k
3.6 V
NiCad
Main
Output
Figure 26. 2.0 A Low Dropout Regulator
+Vin
Vout @ 2.0 A
100
mF
NC
NC
R2
R1
470
5
3
Error
SD
GND FB
47
6
VO T
SNS
2
Vout
Vin
8
1
LP2951CN
MJE2955
4.7 M
Error
Flag
Vout = 1.25V (1.0 + R1/R2)
For 5.0 V output, use internal resistors. Wire Pin 6 to 7,
and wire Pin 2 to +Vout Bus.
20 k
47
4.7
mF
Tant
0.05
680
0.033
mF
2N3906
10 k
Current Limit
Section
220
1000
mF
.33
mF
.01
mF
2N3906



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