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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.
(2) Recommended Input capacitor when Vo<2.6 V; lower RMS mA required .
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 F mini-
mum capacitance.
Ripple current and <100 m
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
.
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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