Copyright  ANPEC Electronics Corp.

Rev. A.8 - Mar., 2004

APL1087

www.anpec.com.tw

4

V

IN

APL1087

OUT

IN

ADJ

V

OUT

150

C

R1

R2

+

+

*

3

Application Circuits

* Needed if device is far from filter capacitors

1.25V to 7.15V Adjustable Regulator

Improving Ripple Rejection

R1

R2

R1

1.250V

+

×

=

V

IN

APL1087

OU T

IN

AD J

TTL

121

Ω

365

Ω

1%

1%

+

1k

1k

5V

+

5V Regulator with Shutdown

V

IN

C

1

V

OU T

+

R1

R2

A P L108 7

OUT

IN

AD J

+

C

2

12 1

Ω

*

*

equal to R1 at ripple frequency

Electrical Characteristics (Cont.)

Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Load line regulations are mea-

sured at a constant junction temperature by low duty cycle pulse testing.

Note 2: Dropout voltage is specified over the full output current range of the device. Dropout voltage is defined as the minimum input/

output differential measured at the specified output current. Test points and limits are also shown on the Dropout Voltage curve.

Note 3: Minimum load current is defined as the minimum output current required to maintain regulation.