MIC2951-4.8BM Micrel Semiconductor, MIC2951-4.8BM Datasheet - Page 13

• Manufacturer Part Number: MIC2951-4.8BM
• Description: 150mA Low-Dropout Voltage Regulator
• Manufacturer: Micrel Semiconductor

February 1999
MIC2950/2951
Latch Off When Error Flag Occurs
RESET
470k
470k
5
3
SD
ERROR
MIC2951
+V IN
+V IN
GND
+
8
4
C1-C4
LP339
6V
LEAD-
ACID
BATTERY
V
OUT
FB
39k
–
+
1
7
C4
Regulator with State-of-Charge Indicator
1%
1%
1%
1%
R 3
RESET
R 1
R 2
V OUT
+
39k
100
k
1
k
1
k
10k
20k
1 F
5
3
SD
ERROR
–
–
–
+
+
+
+V IN
C1
C2
C3
GND
3-61
MIC2951
8
4
C1 TO C4 ARE COMPARATORS (LP339 OR EQUIVALENT)
*OPTIONAL LATCH OFF WHEN DROP OUT OCCURS. ADJUST R3 FOR C2
**OUTPUTS GO LOW WHEN V
100k
100k
100k
SWITCHING WHEN V
SENSE
TAP
4
Open Circuit Detector for 4mA to 20mA Current Loop
V
2
6
OUT
0.1µF
FB
<5.8V**
<6.0V**
<6.2V**
1N
4001
20mA
1
7
IN
+V OUT = 5V
IS 6.0V
+
MIC2951
IN
1 F
GND
DROPS BELOW DESIGNATED THRESHOLDS.
V IN
MIN. VOLTAGE
8
4
V
OUT
1N457
FB
1
7
4V
4.7mA
1
2
360
+5V
OUTPUT*
* HIGH FOR
I < 3.5mA
L
4
5
Micrel
870 33
3