Datasheet

Micrel, Inc. MIC2940A/2941A
July 2007 8
M9999-071307
Typical Applications
V
IN
+V
IN
V
OUT
V
OUT
= 5V
GND
10µF
+
Figure 2. MIC2940A-5.0 Fixed +5V Regulator
OUT
GND ADJUST
V
V
IN
+V
IN
V
OUT
=V
IN
* Minimum Input-Output Voltage Ranges from 40mV to 400mV,
depending on Load Current.
Figure 4. MIC2941A Wide Input Voltage Range
Current Limit
IN
OUT
GND ADJUST
SHUTDOWN
V
V
SHUTDOWN
INPUT
IN
+V
OUT
V
1.2V
26V
1
R
100
pF
22µF
2
R
1.23V
REF
V
V
OUT
=V
REF
x (1 + )
1
R
2
R
OFF
ON
Figure 3. MIC2941A Adjustable Regulator
SHUTDOWN
V
GND
OUT
+V
IN
ADJ
SHUTDOWN
INPUT
100pF
2N2222
1%
300k
+5V to +7V
1%
180k
+
10µF
470 k
OFF
ON
5V
3.3V
220k
1%
V
CC
OUT
Adjust Pin Low = Enable Output. Q1 ON = 3.3V, Q1 OFF = 5.0V.
Figure 5. MIC2941A 5.0V or 3.3V Selectable Regulator
with Shutdown