contact-fact Micrel Semiconductor, contact-fact Datasheet - Page 13

• Manufacturer Part Number: contact-fact
• Description: Mic2950/mic2951 150ma Low-dropout Voltage Regulator
• Manufacturer: Micrel Semiconductor

July 2005
MIC2950/2951
R E S E T
Latch Off When Error Flag Occurs
470k
470k
5
3
S D
ER R OR
MIC2951
+V IN
+V IN
+
G N D
4
8
6V
LEAD-
ACID
B A T T E R Y
C1-C4
LP339
V
OUT
F B
39kΩ
1
7
–
C4
+
Regulator with State-of-Charge Indicator
1%
1%
1%
1%
R 3
RE S E T
R 1
R 2
V OUT
+
39kΩ
100
kΩ
1
kΩ
1
kΩ
10kΩ
20kΩ
1µF
5
3
S D
E R R O R
–
C1
+
–
C2
+
–
C3
+
+V IN
GND
MIC2951
13
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
100kΩ
100kΩ
100kΩ
SWITCHING WHEN V
S E N S E
4
Open Circuit Detector for 4mA to 20mA Current Loop
TAP
V
6
2
OUT
0.1µF
F B
<5.8V**
<6.0V**
<6.2V**
1N
4001
20mA
1
7
IN
+V OUT = 5V
IS 6.0V
+
MIC2951
IN
1µF
G ND
DROPS BELOW DESIGNATED THRESHOLDS.
V IN
MIN. VOLTAGE ≈ 4V
8
4
V
OUT
F B
1N457
1
7
4.7mA
1
2
360
MIC2950/2951
+5V
OUTPUT*
* HIGH FOR
I < 3.5mA
L
Micrel, Inc.
4
5