ISL6413 データシートの表示（PDF） - Renesas Electronics

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ISL6413

Triple Output Regulator with Single Synchronous Buck and Dual LDO

Renesas Electronics 

ISL6413

In order to avoid saturation of the inductor, the inductor should

be rated at least for the maximum output current plus the

inductor ripple current.

TABLE 1. RECOMMENDED INDUCTORS

OUTPUT INDUCTOR

CURRENT VALUE

VENDOR PART #

COMMENTS

0mA to

600mA

10H

Coilcraft DO3316P-103 High

Coilcraft DT3316P-103 Efficiency

Sumida CDR63B-100

Sumida CDRH5D28-100

Coilcraft DO1608C-100 Smallest

Sumida CDRH4D28-100 Solution

0mA to

300mA

10H

Coilcraft DS1608C-103 High

Efficiency

Murata LQH4C100K04 Smallest

Solution

OUTPUT CAPACITOR SELECTION

For best performance, a low ESR output capacitor is needed. If

an output capacitor is selected with an ESR value 120m, its

RMS ripple current rating will always meet the application

requirements. The RMS ripple current is calculated as:

IRMSCO

=

VO



-1---L-–-----V---V----f--O---I--



-------1---------

2 3

The overall output ripple voltage is the sum of the voltage spike

caused by the output capacitor ESR plus the voltage ripple

caused by charge and discharging the output capacitor:

VO

=

VO













-1---L-–-----V---V----f--O---I--







8----------C--1---O----------f

+

E S R





Where the highest output voltage ripple occurs at the highest

input voltage VI.

TABLE 2. RECOMMENDED CAPACITORS

CAPACITOR

VALUE

10F

ESR/m VENDOR PART #

50 Taiyo Yuden

JMK316BJ106KL

COMMENTS

Ceramic

47F

68F

100 Sanyo 6TPA47M

POSCAP

100 Sprague

Tantalum

594D686X0010C2T

INPUT CAPACITOR SELECTION

Because of the nature of the buck converter having a pulsating

input current, a low ESR input capacitor is required for best

input voltage filtering and minimizing the interference with

other circuits caused by high input voltage spikes.

The input capacitor should have a minimum value of 10µF and

can be increased without any limit for better input voltage

filtering. The input capacitor should be rated for the maximum

input ripple current calculated as:

IRMS = IOmax 

V--V---O-I-









1

–

V--V---O-I-

The worst case RMS ripple current occurs at D = 0.5.

Ceramic capacitors show good performance because of their

low ESR value, and because they are less sensitive to voltage

transients, compared to tantalum capacitors.

Place the input capacitor as close as possible to the input pin

of the IC for best performance.

FN9129 Rev 0.00

Oct 29, 2003

Page 11 of 13

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