LP2950ACN-33 Просмотр технического описания (PDF) - Advanced Monolithic Systems Inc
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LP2950ACN-33 Datasheet PDF : 14 Pages
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TYPICAL APPLICATIONS (Continued)
2 Ampere Low Dropout Regulator
CURRENT
LIMIT SECTION
+VIN = VOUT +.5V
680
0.05
470
2N3906
4.7MΩ
8
+VIN
ERROR 5
LP2951
3 SD
7
FB
220
20kΩ
.033
GND
4
VOUT
1
MJE2955
10kΩ
+VOUT @ 2A
ERROR
FLAG
+
R1
1%
+
4.7
TANT.
100µF
R2
VOUT = 1.23V(1+R1/R2)
For 5V VOUT, use internal resistors. Wire pin 6 to 7 and pin 2 to +VOUTBuss.
LP2950/LP2951
Regulator with Early Warning and Auxiliary Output
+VIN
D1
8
2
+VIN
SENSE
6
VTAP
1
VOUT
LP2951
7 FB
#1
5
ERROR
GND
4
D2
5V MEMORY
SUPPLY
+
1µF
20
3.6V
NICAD
2.7MΩ
27 kΩ
D3
D4
EARLY WARNING
Q1
8
2
+VIN
6
VTAP
SENSE
VOUT
7 FB LP2951
#2
3 SD
ERROR 5
GND
4
330 kΩ
MAIN 5V OUTPUT
RESET
µP
VDD
+
1µF
• Early warning flag on low input voltage
• Main output latches off at lower input voltages
• Battery backup on auxiliary output
Operation: Reg.#1’s VOUT is programmed one diode drop above 5V. It’s error flag
becomes active when VIN≤ 5.7V. When VIN drops below 5.3V, the error flag of
Reg.#2 becomes active and via Q1 latches the main output off. When VIN again
exceeds 5.7V Reg.#1 is back in regulation and the early warning signal rises,
unlatching Reg.#2 via D3.
1A Regulator with 1.2V Dropout
UNREGULATED
INPUT
1ΜΩ
1µF
10kΩ
0.01µF
8
6
VTAP
IN
2
SENSE
LP2951
7
FB
GND
4
OUT 1
0.002µF
SUPERTEX
VP12C
OUTPUT
5V ± 1% @
+
0 TO 1A
220µF
2kΩ
IQ ≅ 400µA
Latch Off When Error Flag Occurs
+VIN
470kΩ
8
5
+VIN
ERROR
VOUT
1
470kΩ
LP2951
R1
VOUT
3 SD
7
FB
+
1µF
RESET
GND
4
R2
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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