S19311 datasheet(13/39 Pages) SII

13 / 39 page

FOR AUTOMOTIVE 125°C OPERATION HIGH-WITHSTAND VOLTAGE CMOS VOLTAGE REGULATOR WITH RESET FUNCTION

Rev.1.0_01

S-19311 Series

Seiko Instruments Inc.



Explanation of Terms

1. Regulator block

1. 1 Low dropout voltage regulator

This voltage regulator has the low dropout voltage due to its built-in low on-resistance transistor.

1. 2 Output voltage (VOUT)

The accuracy of the output voltage is ensured at

±2.0% under specified conditions of fixed input voltage

*1, fixed

output current, and fixed temperature.

*1. Differs depending on 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 "1. Regulator block" in " Electrical Characteristics" and "1.

Regulator block" in " Characteristics (Typical Data)" for details.

1. 3 Line regulation 



ΔVOUT1

ΔVIN • VOUT

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

output voltage changes due to a change in the input voltage after fixing output current constant.

1. 4 Load regulation (

ΔVOUT2)

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

output voltage changes due to a change in the output current after fixing input voltage constant.

1. 5 Dropout voltage (Vdrop)

Indicates the difference between input voltage (VIN1) and the output voltage when; decreasing input voltage (VIN)

gradually until the output voltage has dropped out to the value of 98% of output voltage (VOUT3), which is at VIN =

VOUT(S)

+ 1.0 V.

Vdrop = VIN1

− (VOUT3 × 0.98)

S19311 Datasheet(PDF) 13 Page - Seiko Instruments Inc