LOW DROPOUT CMOS VOLTAGE REGULATOR

S-818 Series

Seiko Instruments Inc.

10

Application Conditions

0.47

µF or more

2

µF or more

Equivalent series resistor (ESR):

10

Ω or less

10

Ω or less

Caution A general series regulator may oscillate, depending on the external components selected.

Check that no oscillation occurs with the application using the above capacitor.

Standard Circuit

VSS

VOUT

VIN

*1

*2

INPUT

OUTPUT

GND

Single GND

*1.

µF or more

*2.

In addition to a tantalum capacitor, a ceramic capacitor of 2.0

Figure 10

Caution The above connection diagram and constant will not guarantee successful operation.

Perform through evaluation using the actual application to set the constant.

Technical Terms

1. Low dropout voltage regulator

The low dropout voltage regulator is a voltage regulator having a low dropout voltage characteristic due to

the internal low on-resistance transistor.

The accuracy of the output voltage is ensured at

±2.0 % under the specified conditions of input voltage,

output current, and temperature, which differ product by product.

Caution When the above conditions are changed, the output voltage may vary and go out of the

accuracy range of the output voltage. Refer to the “ Electrical Characteristics” and

“ Characteristics” for details.

3. Line regulation 1 (

Line regulation indicates the input voltage dependence of the output voltage. The value shows how much

the output voltage changes due to the change of the input voltage when the output current is kept

constant.