Since both outputs are controlled by the same ENABLE,

the CS8161 is ideal for applications where a sleep mode is

required. Using the CS8161, a section of circuitry such as a

display and nonessential 5V circuits can be shut down

under microprocessor control to conserve energy.

The example in the Applications Diagram shows an auto-

motive radio application where the display is powered by

tion and the Radio On/Off switch are on.

The output compensation capacitor (Application diagram

linear regulator: start-up delay, load transient response

and loop stability.

The capacitor value and type should be based on cost,

availability, size and temperature constraints. A tantalum

or aluminum electrolytic capacitor is best, since a film or

ceramic capacitor with almost zero ESR, can cause insta-

bility. The aluminum electrolytic capacitor is the least

expensive solution, but, if the circuit operates at low tem-

peratures (-25¡C to -40¡C), both the value and ESR of the

capacitor will vary considerably. The capacitor manufac-

turers data sheet usually provide this information.

the Applications Circuit should work for most applica-

tions, however it is not necessarily the best solution.

ticular application, start with tantalum capacitors of the

recommended value on each output and work towards

less expensive alternative parts for each output in turn.

6

CS8161

0.1

mF

ENABLE

1

Gnd

22

mF

+

+

22

mF

2

Display

Tuner

NOTES:

* C1 required if regulator is located far from power supply filter.

** C2, C3 required for stability, value may be increased. Capacitor must operate at minimum temperature expected.

Application Diagram

Stability Considerations

ENABLE

1

System

Condition

60V

3V

2.4V

12V

0V

Turn

On

Load

Dump

Line Noise, Etc.

1

Short

Circuit

Thermal

Shutdown

1

Turn

Off

5V

0V

14V

5V

2.0V

0.8V

14V

26V

31V

12V

12V

2.4V

12V

12V

0V

0V

2

0V

5V

0V

0V

2

Short

Circuit

Typical Circuit Waveform

Application Notes