Micrel, Inc.

MIC2940A/2941A

July 2007

8

M9999-071307

Typical Applications

GND

10µF

+

Figure 2. MIC2940A-5.0 Fixed +5V Regulator

OUT

GND

ADJUST

V

VIN

+VIN

VOUT =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 AD JUST

SHUTDOWN

V

V

SHUTDOWN

INPUT

IN

+V

OUT

V

1.2V

26V

1

R 100

pF

22µF

2

R

1.23V

RE F

V

VOUT =VREF x (1 +

)

1

R

2

R

OF F

ON

Figure 3. MIC2941A Adjustable Regulator

SHUTDOWN

V

GND

OUT

+VIN

ADJ

SHUTDOWN

INPUT

100pF

2N2222

1%

300k

+5V to +7V

1%

180k

+

10µF

470 k

OFF

ON

5V

3.3V

220k

1%

VCC 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