LP2951ACN-3.3G ON Semiconductor, LP2951ACN-3.3G Datasheet - Page 12
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LP2951ACN-3.3G
Manufacturer Part Number
LP2951ACN-3.3G
Description
IC REG LDO 100MA 3.3V 8-DIP
Manufacturer
ON Semiconductor
Datasheet
1.LP2951ACDR2G.pdf
(23 pages)
Specifications of LP2951ACN-3.3G
Regulator Topology
Positive Fixed
Voltage - Output
3.3V
Voltage - Input
Up to 30V
Voltage - Dropout (typical)
0.35V @ 100mA
Number Of Regulators
1
Current - Output
100mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Number Of Outputs
1
Polarity
Positive
Input Voltage Max
30 V
Output Voltage
3.3 V
Output Type
Fixed
Dropout Voltage (max)
0.08 V at 100 uA
Output Current
0.1 A
Line Regulation
0.1 %
Load Regulation
0.1 %
Voltage Regulation Accuracy
0.5 %
Maximum Operating Temperature
+ 125 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Reference Voltage
1.25 V
Primary Input Voltage
30V
Output Voltage Fixed
3.3V
Dropout Voltage Vdo
350mV
No. Of Pins
8
Operating Temperature Range
-40°C To +125°C
Input Voltage Primary Max
30V
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
2N3906
Q1
2.7 M
330 k
D4
NC
5
3
5
3
Error
SD
Error
SD
Figure 25. Regulator with Early Warning and Auxiliary Output
LP2951CN
LP2951CN
GND
27 k
GND FB
Error
Flag
4
4
+V
#1
#2
V
V
20 k
2N3906
in
in
in
8
8
FB
V
V
SNS
SNS
V
V
O
O
out
4.7 M
out
7
7
Current Limit
Section
T
T
680
0.033 mF
V
For 5.0 V output, use internal resistors. Wire Pin 6 to 7,
and wire Pin 2 to +V
Figure 26. 2.0 A Low Dropout Regulator
220
out
2
6
2N3906
2
6
1
1
= 1.25V (1.0 + R1/R2)
D3
D1
5
3
Error
SD
LP2951CN
GND FB
1.0 mF
Main
Output
1.0 mF
http://onsemi.com
4
D2
Early Warning
V
in
8
Reset
V
V
SNS
V
O
out
10 k
DD
out
7
T
20
470
Bus.
3.6 V
NiCad
12
mP
Memory
V+
2
6
1
.01 mF
.33 mF
NC
NC
+V
47
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 V
diode drop above 5.0 V. Its error flag becomes active
when V
error flag of regulator #2 becomes active and via Q1
latches the main output “off”. When V
5.7 V, regulator #1 is back in regulation and the early
warning signal rises, unlatching regulator #2 via D3.
MJE2955
R1
in
0.05
4.7 mF
R2
Tant
in
< 5.7 V. When V
1000 mF
V
out
@ 2.0 A
100 mF
in
out
drops below 5.3 V, the
is programmed one
in
again exceeds