Microsemi

Linfinity Microelectronics Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 8

Copyright

© 2000

Rev. 2.0, 2005-11-02

LX8386x-xx

1.5A Low Dropout Positive Regulators

TM

®

TY PICAL APPLICATIONS

10µF

R1

121

Ω 1%

R2

365

Ω 1%

IN

ADJ

OUT

V

IN

V

OUT

C1

10µF*

150µF

+

+

* C1 improves ripple rejection.

X

R1 at ripple

frequency.

(Note A)

≈

Part

LX8386

Figure 4 –

Improving Ripple Rejection

C1*

10µF

R1

121

Ω 1%

R2

1k

IN

ADJ

OUT

V

IN

V

C2

100µF

+

+

* Needed if device is far from filter capacitors.

⎟

⎠

⎞

⎜

⎝

⎛

+

=

R1

R2

1

1.25V

*V

*

OUT

(Note A)

Part

LX8386

Figure 5 –

1.2V – 8V Adjustable Regulator

10µF

365

Ω

1%

100µF

1k

1k

121

Ω

1%

2N3904

IN

ADJ

OUT

TTL

Output

V

IN

5V

+

+

(note A)

Part

LX8386

Figure 6 –

5V Regulator with Shutdown

IN

ADJ

OUT

V

IN

3.3V

10µF Tantalum or

100µF Aluminum

Min. 15µF Tantalum or

100µF Aluminum capacitor.

May be increased without

limit. ESR must be less

than <400m

Ω.

Part

LX8386

Figure 7 –

Fixed 3.3V Output Regulator

Note A:

X)

DROPOUT(MA

OUT

IN(MIN)

V

)

V

V

Intended

+

= (