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Application Notes

Table 2-1: Input/Output Capacitors

(1) N/R –Not recommended. The voltage rating does not meet the minimum operating limits.

Capacitor Recommendations for

the PT6360 Series

of Integrated Switching Regulators

Input Capacitor:

The recommended input capacitance is determined by

1.3-A minimum ripple current rating and 560 µF mini-

mum capacitance.

Ripple current and <100 m

Ω equivalent series resistance

(ESR) values are the major considerations, along with

temperature, when designing with different types of

capacitors. Tantalum capacitors have a recommended

minimum voltage rating of 2

× (max. dc voltage + ac

ripple). This is necessary to insure reliability for input

voltage bus applications.

Output Capacitors:

The recommended ESR of the output capacitor is 150m

Ω.

Electrolytic capacitors have marginal ripple performance

at frequencies greater than 400kHz but excellent low

frequency transient response. Above the ripple frequency,

ceramic capacitors are necessary to improve the transient

response and reduce any high frequency noise components

apparent during higher current excursions. Preferred low

ESR type capacitor part numbers are identified in Table

2-1.

PT6360 Series

Tantalum Capacitors

Tantalum type capacitors can be used for the output but

only the AVX TPS, Sprague 593D/594/595 or Kemet

T495/T510 series. These capacitors are recommended

over many other tantalum types due to their higher rated

surge, power dissipation, and ripple current capability.

As a caution the TAJ series by AVX is not recommended.

This series has considerably higher ESR, reduced power

dissipation, and lower ripple current capability. The TAJ

series is less reliable than the AVX TPS series when deter-

mining power dissipation capability. Tantalum or Oscon®

types are recommended for applications where ambient

temperatures fall below 0 °C.

Capacitor Table

Table 2-1 identifies the characteristics of capacitors from

a number of vendors with acceptable ESR and ripple

current (rms) ratings. The number of capacitors required

at both the input and output buses is identified for each

capacitor type.

This is not an extensive capacitor list. Capacitors from other

vendors are available with comparable specifications. Those listed

are for guidance. The RMS ripple current rating and ESR

(Equivalent Series Resistance at 100 kHz) are critical param-

eters necessary to insure both optimum regulator performance

and long capacitor life.

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