MIC2940A/2941A
Micrel
+VIN
Typical Applications
V IN
VIN
+VIN
V
OUT
+
GND
*V OUT
≈5V
VOUT
VOUT
1.2V
26V
V
OUT
= 5V
10µF
ON
SHUTDOWN
INPUT
OFF
SHUTDOWN
GND ADJUST
1.23V
R1 100
pF
22µF
R1
VOUT = VREF x (1 +
)
R2
V REF
R2
Figure 2. MIC2940A-5.0 Fixed +5V Regulator
Figure 3. MIC2941A Adjustable Regulator
+5V to +7V
+VIN
+VIN
VCC OUT
VOUT
SHUTDOWN
OFF
ON
VIN
VOUT
VOUT
≈
VIN
SHUTDOWN
INPUT
+
100pF
GND
ADJUST
300kΩ
1%
10µF
GND
ADJUST
470 kΩ
220kΩ
1%
2N2222
Input
0
1
Output
3.3V
5.0V
5V
3.3V
180kΩ
1%
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40
m
V TO 400
m
V,
DEPENDING ON LOAD CURRENT.
ADJUST PIN LOW= ENABLE OUTPUT. Q1 ON = 3.3V, Q1 OFF = 5.0V.
Figure 4. MIC2941A Wide Input Voltage Range Current Limiter
Figure 5. MIC2941A 5.0V or 3.3V Selectable Regulator with
Shutdown.
MIC2940A/2941A
8
June 1999
MICREL [ MICREL SEMICONDUCTOR ]
