MIC2950 Datasheet, PDF (13/14 Pages) Micrel Semiconductor – 150mA Low-Dropout Voltage Regulator

MIC2950/2951
+V _IN
470kΩ
8
+V _IN
5 _ERROR
470kΩ
VOUT ¹
3 _SD
RESET
MIC2951
GND
FB ⁷
4
VOUT
R1
+ _1µF
R2
Latch Off When Error Flag Occurs
4
20mA
1N
4001
0.1µF
Micrel
+5V
4.7mA
8
VIN
VOUT ¹
MIC2951
7
FB
GND
4
1N457
OUTPUT*
1
5
4
2
* HIGH FOR
360 ^{IL < 3.5mA}
MIN. VOLTAGE 4V
Open Circuit Detector for 4mA to 20mA Current Loop
8
2
39kΩ
+VIN SENSE
5 _ERROR
VOUT ¹
RESET
MIC2951
–
C4
3 _SD
+
FB ⁷
39kΩ
GND
4
TAP
6
+VOUT = 5V
+
1µF
+ _6V
LEAD-
1%
100
kΩ
ACID
BATTERY
1%
1
kΩ
C1-C4
LP339
1%
1
kΩ
–
100kΩ
C1
+
<5.8V**
–
100kΩ
C2
+
<6.0V**
–
100kΩ
C3
+
<6.2V**
10kΩ
R3
1% 20kΩ
3
870 33
C1 TO C4 ARE COMPARATORS (LP339 OR EQUIVALENT)
*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.
Regulator with State-of-Charge Indicator
February 1999
3-61