HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR

S-L2980 Series

Seiko Instruments Inc.

9

Technical Terms

1. Low Dropout Voltage Regulator

The low dropout voltage regulator is a voltage regulator whose dropout voltage is low due to its built-in

low on-resistance transistor.

2. Low ESR

Low ESR means the Equivalent Series Resistance of a capacitor is small. The low ESR ceramics

can be used.

The accuracy of the output voltage is ensured at

± 2.0 % under the specified conditions of fixed input

voltage

*1. Differs depending upon the product.

Caution If the above conditions change, the output voltage value may vary and exceed the

accuracy range of the output voltage. Refer to the “

Electrical Characteristics” and

“

Typical Characteristics” for details.

⎟

⎠

⎞

⎜

⎝

⎛

IN

OUT1

V

ΔV

ΔV

Regulation

Line

4.

Indicates the dependency of the output voltage on the input voltage. That is, the value shows how

much the output voltage changes due to a change in the input voltage with the output current remaining

unchanged.

5. Load Regulation (

ΔV

Indicates the dependency of the output voltage on the output current. That is, the value shows how

much the output voltage changes due to a change in the output current with the input voltage remaining

unchanged.