Copyright

© ANPEC Electronics Corp.

Rev. A.9 - Dec., 2008

APL1087

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise

customers to obtain the latest version of relevant information to verify before placing orders.

800mA Low Dropout Fast Response Positive Adjustable Regulator and Fixed

1.8V, 2.5V, and 3.3V

TO- 252 Power Packages.

(RoHS Compliant)

Features

General Description

The APL1087 is a low dropout three-terminal adjustable

regulators with 0.8A output current capability. In order to

obtain lower dropout voltage and faster transient

response, which is critical for low voltage applications,

the APL1087 has been optimized.

The device is available in an adjustable version and fixed

output voltages of 1.8V, 2.5V, and 3.3V, the output avail-

able voltage range is from 1.25 to 7.15V with an input

supply below 9V. Dropout voltage is guaranteed at a maxi-

mum of 1.45V at 0.5A.

Current limit is trimmed to ensure specified output cur-

rent and controlled short-circuit current. On-chip thermal

limiting provides protection against any combination of

o ve r l o a d t h a t wo u l d c r e a t e e xc e s s i ve j u n c t i o n

temperatures.

The APL1087 is available in the industry standard 3-pin

SOT-89, SOT-223, TO-92, and TO-252 power packages.

Applications

Simplified 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

+

×

=

5V Regulator with Shutdown

equal to R1 at ripple frequency

V

IN

V

OUT

+

R1

R2

APL1087

OUT

IN

ADJ

+

121

Ω

*

*

10

µF

C

1

100

µF

C

2

V

IN

APL1087

OUT

IN

ADJ

TTL

121

Ω

365

Ω

1%

1%

+

1k

1k

5V

+

10

µF

100

µF

V

IN

APL1087

OUT

IN

ADJ

V

OUT

150

µF

C

R1

R2

+

+

*

3

10

µF

10

µF