9

Apr 20-07 Rev B

SPX1117 800mA Low Dropout Voltage Regulator

© 2007 Sipex Corporation

Figure 24. 5V Regulator with Shutdown

SPX1117

V

IN

R

1

R

2

10µF

10µF*

1kΩ,

330Ω

1%

+

+

4.7µF

C

1

*C

1

improves ripple rejection.

Z

C

should be ~ R1 at ripple frequency

5V

ADJ

IN

OUT

(Note A)

V

OUT

Note A: V

1%

1kΩ

SPX1117

10µF

1%

330W

1%

+

+

4.7µF

5V

ADJ

IN

OUT

(Note A)

1K

1k

TTL

Input

2N3904

DROPOUT (MAX)

Note A: V

IN(MIN)

= (Intended V

OUT

) + (V

)

V

IN

Figure 25. Recommended Connections for Best Results

Figure 23. Improving Ripple Rejection

SPX1117

Connect R

2

to Load

Connect R to

Case of Regulator

Resistance

ADJ

APPLICATION INFORMATION: Continued

PINOUTS

1

3

2

SOT-223 (M3)

Top View

TO-263-3 (T)

1

2

3

Front View

TO-220-3 (U)

1

2

3

Front View

TO-252 (R)

ADJ/GND

V

OUT

1

2

3

V

IN

ADJ/GND

V

OUT

V

IN

ADJ/GND

V

OUT

V

IN

ADJ/GND

V

OUT

V

IN

Top View