Advanced Monolithic Systems, Inc.

6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

AMS34063

APPLICATION HINTS

Design Formula Table

Calculation

Step-Down

Step-Up

OFF

ON

t

t

OUT

SAT

IN(MIN)

F

OUT

V

-

V

-

V

V

V

+

V

-

V

V

-

V

V

SAT

IN(MIN)

IN(MIN)

F

OUT

+

MIN

f

1

MIN

f

1

4 x 10

ON

4 x 10

ON

(

)













+

OFF

OFF

ON

MAX

OUT

t

t

t

2I

)

ON(MAX

PK(switch)

OUT

SAT

IN(MIN)

t

I

V

V

V









−

−

)

ON(MAX

PK(switch)

SAT

IN(MIN)

t

I

V

V









−

P)

ripple(P

OFF

ON

PK(switch)

8V

)

t

(t

I

−

+

ripple

ON

OUT

V

t

I

≈

Notes

The following power supply characteristics must be chosen:











 +

=

1

2

OUT

R

R

1

1.25

V

.

capacitor’s equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will

directly effect the line and load regulation.