S-81218SG View Datasheet(PDF) - Seiko Instruments Inc

Part Name

Description

Manufacturer

S-81218SG

HIGH-PRECISION VOLTAGE REGULATOR

Seiko Instruments Inc 

HIGH-PRECISION VOLTAGE REGULATOR

S-812XXSG Series

Table 28 Parameter dependency due to output current fluctuation

Parameter

Output current fluctuation
IOUT

Load capacitance CL

Input voltage

VIN

Temperature

Ta

Method to decrease

overshoot

Decrease

Increase

Increase



Method to decrease

undershoot

Decrease

Increase

Increase



For reference, the following describes the results of measuring the ringing amounts at the VOUT pin using the input

voltage (VIN), load capacitance (CL), output current fluctuation width (
IOUT), and temperature as parameters.

Reference data Load transient response of S-81250SG

1. VIN dependency

0.6

CL=10F

0.5 Ta=25C

Ringing 0.4

amount 0.3

(V)

0.2

0.1

0.0

6 8 10 12 14 16

VIN (V)

2. CL dependency

0.5

0.4

Ringing 0.3

amount

(V) 0.2

VIN=7V

Ta=25C

0.1

0.0

0 10 20 30 40 50

CL (F)

3.
IOUT dependency

IOUT shows the difference between the low

current fixed to 1 A and the high.

For example,
IOUT =10 mA means the difference

between 10mA and 1 A.

4. Temperature dependency

1.2 CL=10F

1.0 Ta=25C

VIN=7V

Ringing 0.8

amount

(V) 0.6

0.4

0.2

0.0

0 5 10 15 20 25 30

IOUT (mA)

0.5

0.4

Ringing

amount 0.3

(V)

0.2

VIN=7V

CL=10F

0.1

-40

0 40 80

Ta (C)

Undershoot

Overshoot

16

Seiko Instruments Inc.

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