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LP2951 数据表(PDF) 3 Page - Microchip Technology

部件名 LP2951
功能描述  100 mA Low-Dropout Voltage Regulator
PDF  30 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

LP2951 数据表(HTML) 3 Page - Microchip Technology

  LP2951 Datasheet HTML 1Page - Microchip Technology LP2951 Datasheet HTML 2Page - Microchip Technology LP2951 Datasheet HTML 3Page - Microchip Technology LP2951 Datasheet HTML 4Page - Microchip Technology LP2951 Datasheet HTML 5Page - Microchip Technology LP2951 Datasheet HTML 6Page - Microchip Technology LP2951 Datasheet HTML 7Page - Microchip Technology LP2951 Datasheet HTML 8Page - Microchip Technology LP2951 Datasheet HTML 9Page - Microchip Technology Next Button
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2017 - 2022 Microchip Technology Inc. and its subsidiaries
DS20005736B-page 3
LP2951
Typical Application Diagrams
• EARLY WARNING FLAG ON LOW INPUT VOLTAGE
• MAIN OUTPUT LATCHES OFF AT LOWER INPUT VOLTAGES
• BATTERY BACKUP ON AUXILIARY OUTPUT
OPERATION: REG. #1’S V
OUT IS PROGRAMMED ONE DIODE DROP ABOVE 5V.
ITS ERROR FLAG BECOMES ACTIVE WHEN V
IN ≤ 5.7V.
WHEN V
IN DROPS
BELOW 5.3V, THE ERROR FLAG OF REG. #2 BECOMES ACTIVE AND VIA Q1
LATCHES THE MAIN OUTPUT OFF. WHEN V
IN AGAIN EXCEEDS 5.7V REG. #1
IS BACK IN REGULATION AND THE EARLY WARNING SIGNAL RISES,
UNLATCHING REG. #2 VIA D3.
LP2951
#1
SENSE
V
ERROR
GND
20
27kΩ
4
5
1
8
OUT
+VIN
2
LP2951
#2
SENSE
V
ERROR
GND
+
4
5
1
8
OUT
+VIN
2
MEMORY
V+
D 2
D 1
2.7MΩ
D 3
D 4
330kΩ
RESET
EARLY WARNING
μP
VDO
SD
3
Q1
1μf
MAIN
OUTPUT
1μF
+VIN
3.6V
NICAD
REGULATOR WITH EARLY WARNING
AND AUXILIARY OUTPUT
LP2951
SD
V
ERROR
GND
4
1
8
OUT
+V IN
FB
5
3
470k
470k
+VIN
RESET
R1
R 2
7
VOUT
+
1μF
LATCH-OFF WHEN ERROR FLAG OCCURS
LP2951
V
GND
4
1
8
OUT
VIN
FB
7
0.1μF
1N
4001
4
20mA
OUTPUT*
4.7mA
+5V
1
5
4
2
MIN. VOLTAGE
4V
360
1N457
* HIGH FOR
I < 3.5mA
L
OPEN CIRCUIT DETECTOR FOR 4 mA
TO 20 mA CURRENT LOOP
LP2951
SD
V
ERROR
GND
4
1
8
OUT
+VIN
FB
6
5
3
TAP
SENSE
2
+
1μF
+VOUT = 5V
+
–
C1
100kΩ
<5.8V**
+
–
C2
100kΩ
<6.0V**
+
–
C3
100kΩ
<6.2V**
39kΩ
100
kΩ
1%
1
kΩ
1%
1
kΩ
1%
1%
10kΩ
20kΩ
R3
+
–
C4
RESET
39kΩ
6V
LEAD-
ACID
BATTERY
+
C1-C4
LP339
7
*OPTIONAL LATCH OFF WHEN DROP OUT OCCURS. ADJUST R3 FOR C2
SWITCHING WHEN V
IN
IS 6.0V
**OUTPUTS GO LOW WHEN V
IN
DROPS BELOW DESIGNATED THRESHOLDS.
C1 TO C4 ARE COMPARATORS (LP339 OR EQUIVALENT)
REGULATOR WITH
STATE-OF-CHARGE INDICATOR



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