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LP2951CDM-3.3 Datasheet(PDF) 11 Page - ON Semiconductor

Part # LP2951CDM-3.3
Description  Micropower Voltage Regulators
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LP2951CDM-3.3 Datasheet(HTML) 11 Page - ON Semiconductor

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LP2950
http://onsemi.com
11
330 k
Figure 22. Regulator with Early Warning and Auxiliary Output
+Vin
Memory
V+
1.0
µF
20
5
3
Error
SD
Gnd
FB
47
6
VO T
SNS
2
Vout
Vin
8
1
LP2951CN
#1
1.0
µF
5
3
Error
SD
Gnd
FB
47
6
VO T
SNS
2
Vout
Vin
8
1
LP2951CN
#2
NC
Reset
VDD
µP
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 23. 2.0 A Low Dropout Regulator
+Vin
Vout @ 2.0 A
100
µF
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
µF
Tant
0.05
680
0.033
µF
2N3906
10 k
Current Limit
Section
220
1000
µF
.33
µF
.01
µF
2N3906


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