www.advanced-monolithic.com

updated April 24, 2009

AMS2931

PIN CONNECTIONS

FIXED OUTPUT VOLTAGE

TO-92

Plastic Package (N)

8L SOIC

SO-Package (S)

TO-220 (T)

TO-263 (M)

OUTPUT

INPUT

GND

N/C

OUTPUT

N/C

INPUT

GROUND

GROUND

GROUND

GROUND

1

2

8

4

3

7

5

6

GND

OUTPUT

INPUT

TAB IS

GND

GND

INPUT

OUTPUT

Bottom View

Top View

Front View

Top View

ADJUSTABLE OUTPUT VOLTAGE

8L SOIC

SO-Package (S)

ON/OFF

OUTPUT

ADJ

INPUT

GROUND

GROUND

GROUND

GROUND

1

2

8

4

3

7

5

6

Top View

TYPICAL APPLICATIONS

AMS2931-X (Fixed Output)

AMS2931C (Adjustable Output)

AMS2931

V

IN

UNREGULATED

INPUT

V

OUT

REGULATED

OUTPUT

C2**

100

µF

C1*

0.1

µF

GND

I

Q

*Required if regulator is located far from power supply filter.

**C2 must be at least 100

µF to maintain stability; it can be increased

without bound to maintain regulation during transients and it should be

located as close as possible to the regulator. This capacitor must be rated

over the same operating temperature range like the regulator. The ESR

of this capacitor is critical (see curve).

R

2

ADJ

+

AMS2931

ADJUSTABLE

GND

C2**

100

µF

C1*

0.1

µF

OUT

OFF

ON

ON/OFF

R

1

28k

V

OUT

V

CC

R

3

51k

due to the input bias current of the Adjust Pin ( approx. 1

µA)