LC823450 datasheet(106/112 Pages) ONSEMI

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LC823450

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106

THE GUIDANCE OF POWER SUPPLY CONTROL (RECOMMENDATION)

Power supply control should keep at least one of the

guidances below, and make sure no problem for mass

production based on customer side evaluations.

The Guidence in Terms of Power on Wave Form

Power on wave form should keep the guidance below.

Figure 59.

No care

0 V

0.6 V or less

More than 600

μs

Power supply electric potential

− 0.1 V

When the voltage suddenly stands up at the time of power

supply injection, please make the voltage to arrive at it less

than 0.6 V. Please spend time beyond 600

μs and increase the

voltage from the voltage which rose momentarily to the

power supply electric potential – 0.1 V. When the voltage

does not suddenly rise and stands up to power supply electric

potential linearly, please spend time beyond 600

μs and

increase the voltage from 0 V to the power supply electric

potential.

The Guidence in Terms of the Placement of Bypass

Condenser

Place bypass condenser 0.1

μF or more at the nearest point

of each power supply pin, and place power circuit at the

nearest point of power supply pin.

Parasitic inductance L1 and L2 should be equal to or below

the value described in the table below. In addition, as for the

value of L1 of the WLP package, it becomes the value that

added 4nH to value of L1 of the table.

The inductance can be calculated from the width:W[mm],

thickness: H[mm] and length: L[mm] of wiring on board,

and affect layour of this LSI and bypass condenser.

Refer to “The formula to calculate parasitic inductance”

to calculate indactance.

Figure 60.

This LSI

power

circuit

Bypass capacitor

Table 60.

TQFP

(Pin No)

WLP

(Ball)

PIN NAME

Bypass

Capacitor

Power Supply Range

VDD2

4 nH

50 nH

0.1

μF

under 2 V case

1.5 nH

50 nH

0.1

μF

equal 2 V or more case

AVDDUSBPHY1

4 nH

80 nH

0.1

μF

−

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